CN100570687C - Image element circuit, light-emitting device and electronic device - Google Patents

Abstract

OLED element (83) surpasses threshold value Vth by the level that makes drive signal (Sc) and carries out luminous.Driving transistors (81) generates drive signal (Sc) according to the data-signal Dj by data signal line Ldj input.Capacitor (Ca) OLED element (83) configuration side by side relatively is to drive signal (Sc) waveform of supplying with to OLED element (83) from driving transistors (81), as the time constant circuit performance function of passivation.The electrostatic capacitance of selected capacitor (Ca) so that in the drive signal (Sc) that generates by driving transistors (81), than in the short time span of fixed time span, make interval decay to the level that is lower than this threshold value Vth above threshold value Vth.Needn't shorten the time span of the signal of appointment light-emitting component brightness, just can prevent that each light-emitting component from producing luminance errors to the unit circuit input.

Description

Image element circuit, light-emitting device and electronic device

Technical field

The invention relates to the technology of control light-emitting components such as OLED (Organic Light Emitting Diode) element.

Technical background

A kind of light-emitting device with a plurality of light-emitting components is proposed for many years.This light-emitting device because of specifying the various reasons such as signal (to call " digital signal " in the following text) delay of light-emitting component brightness, causes the brightness generation error of light-emitting component sometimes.

For example, previously presented a kind of light-emitting device is that each contains the formation that a plurality of image element circuits of light-emitting component are connected with common distribution (to call " data signal line " in the following text).During this constitutes, time-sharing operation is specified the data-signal of each light-emitting component brightness, each fixed during in (to call " between sampling date " in the following text), import image element circuit successively from data signal line, by the brightness of controlling light-emitting component that infeeds of the drive signal that generates according to this data-signal.During this constitutes, data-signal keeps according to during the level of a light-emitting component brightness and in full accord on time shaft between the sampling date of this data-signal, data-signal is input to each image element circuit in the interval of this expectation, can suitably control the brightness of light-emitting component.So on the other hand, because when propagating in data signal line, various reasons such as waveform is blunt postpones between the relative sampling date of data-signal sometimes.In this case, because between a sampling date, change has taken place the level of data-signal, so can not supply with desired drive signal to light-emitting component, its result can cause the brightness generation error of light-emitting component.

As the technology of head it off, in patent documentation 1 and the patent documentation 2, a kind of formation is disclosed for example, as shown in figure 16, between the relative sampling date in formation front and back, insert Pd at interval among the Ps.Constitute according to this, between each sampling date the terminal point of Ps to thereafter between sampling date the initial point of Ps every Pd, data-signal D can not be input in any image element circuit.Therefore, as among Figure 16 with shown in " D (delay is arranged) ", even data-signal D length time delay Δ d, this retardation Δ d also only limits in the time span scope of period P d, so the brightness of light-emitting component error can not take place.

[patent documentation 1] spy opens flat 5～No. 241536 communiques (Fig. 1 and Fig. 2)

[patent documentation 2] spy opens flat 9～No. 212133 communiques (Fig. 1 and Fig. 2)

Therefore, in this technology, the part of time span (Ps between sampling date) the shortening interval Pd of image element circuit that has to data-signal D is input to.Therefore, in the time of must taking a sample to data-signal with the short period to each image element circuit (for example, when the image element circuit number that is connected with data signal line is a lot), to the impossible fully input data signal of each image element circuit, so the problem that exists is the brightness that is difficult to control each light-emitting component.

Summary of the invention

The present invention carries out in light of this situation, its objective is to solve following problem, that is, do not shorten the time span of the signal of appointment light-emitting component brightness to the image element circuit input, and can prevent the luminance errors of each light-emitting component.

For solving this problem, image element circuit of the present invention has the light-emitting component that forms brightness according to the level of drive signal, with the generative circuit that generates the drive signal of specifying above-mentioned light-emitting component brightness according to data-signal, above-mentioned signal generating circuit comprises: will supply with gate electrode according to the current potential of data-signal, and generate the driving transistors (for example phase inverter Cb1 among the driving transistors among Fig. 3 81 and Fig. 9) of drive signal; With will supply with the time constant circuit of the drive signal waveform passivation (that is, reducing the variation of drive signal level in the time per unit) of above-mentioned light-emitting component by above-mentioned driving transistors.

During this constitutes, by the drive signal waveform of signal generating circuit supply light-emitting component, passivation by time constant circuit.Therefore, even because of various reasons such as delay or noises, when making drive signal be displaced to the level different with desired value in a short time, also the brightness that can reduce light-emitting component exerts an influence.Because time constant circuit reduced the influence of the change of drive signal, be input to time span in the image element circuit so there is no need to shorten the signal (data-signal) of specifying light-emitting component brightness.And so-called light-emitting component of the present invention is the element that utilizes electro ultrafiltration luminous.For example, except the OLED element, the notion of said light-emitting component also comprises various elements such as inorganic EL diode element or light-emitting diode among the present invention.

When drive signal level surpass during fixed threshold value, have in the image element circuit of light-emitting component, above-mentioned time constant circuit is determined time constant, so that be input in the data-signal of above-mentioned signal generating circuit, than surpass the signal of above-mentioned threshold value in the short time span of fixed time, when being input in the above-mentioned signal generating circuit, by the signal attenuation of this time constant circuit output level to the above-mentioned threshold value that is lower than above-mentioned light-emitting component.According to this form, even drive signal level surpasses the threshold value of light-emitting component in a short time, this interval level also can decay to the level that is lower than this threshold value by time constant circuit, so just can accurately prevent to produce luminance errors because of this drive signal change causes optical element.Especially among the present invention, in the drive signal, in than the short time span of institute definite value, surpass the total interval of threshold value, there is no need to decay to the level that is lower than this threshold value.Promptly, even when surpassing threshold value, surpass the interval (that is, between light-emitting component mistake light emission period) of this threshold value by the drive signal level of time constant circuit after with the waveform passivation, the waveform of drive signal is also passivation preferably, to form the time span that does not become specific question for the image element circuit purposes.For example, utilize in the display device of image element circuit of the present invention, in fact, even luminous because of reasons such as drive signal delay initiation light-emitting component mistake, as long as this is the imperceptible time span of people's vision, the present invention has just brought into play desired effect really.

In the optimal morphology of the present invention, above-mentioned light-emitting component comprises the 1st electrode and the 2nd electrode, and has the power lead that is electrically connected with above-mentioned the 1st electrode by above-mentioned driving transistors, and above-mentioned time constant circuit is configured between said power and the 1st electrode.Can prevent effectively that according to this form the mistake of light-emitting component is luminous.

In addition, in another form of the present invention, at the sample circuit (for example, the transmission gate among Fig. 3 71) that sampling is set between to the data-signal sampling date of specifying light-emitting component brightness by data signal line, signal generating circuit is according to the sampled data signal generation drive signal of sample circuit.During this constitutes, determine the time constant of time constant circuit, so that in the drive signal that signal generating circuit generates, in the time span of the data-signal retardation weak point between the comparison sampling date, the interval that surpasses the light-emitting component threshold value decays to the level that is lower than this threshold value.But, also can be to carry out constituting of data-signal sampling by signal generating circuit.That is, the signal generating circuit of this formation for example is made of the on-off element that is connected with data signal line, by the data-signal that infeeds in this data signal line is taken a sample, exports as drive signal.

In form preferred for this invention, above-mentioned time constant circuit comprises that a side electrode is connected with an end of above-mentioned light-emitting component, and (for example, the capacitor C shown in Fig. 3 and Figure 11 a) simultaneously to apply the capacity cell of constant potential to the opposing party's electrode.According to this form, for example resistance components and the wiring resistance by light-emitting component constitutes the RC time constant circuit with this electric capacity.According to this form, can simplify the formation of time constant circuit.In addition, the time constant circuit in the another kind of form comprises the resistance between said power and the 1st electrode.In this form, constitute the RC time constant circuit by electric capacity (for example the capacity cell that is connected with the 1st electrode of light-emitting component or be attached to electric capacity on the light-emitting component) and this resistance.

In addition, in the another kind of form, above-mentioned driving transistors be the 1st circuit for reversing that constitutes by the 1st transistor of complementary type and the 2nd transistor (for example, phase inverter Cb1 shown in Fig. 9 or Figure 12), above-mentioned time constant circuit be the 2nd circuit for reversing that constitutes by the 3rd transistor of complementary type and the 4th transistor (for example, phase inverter Cb2 shown in Fig. 9 or Figure 12), be fed to the input end of above-mentioned the 1st circuit for reversing according to the current potential of data-signal, the output terminal of above-mentioned the 1st circuit for reversing is connected in the input end of above-mentioned the 2nd circuit for reversing, and the output terminal of above-mentioned the 2nd circuit for reversing is connected in above-mentioned the 1st electrode.And the 1st transistor in the above form and the 2nd transistor for example are equivalent to transistor Tr 1 and the Tr2 of phase inverter Cb1 among Fig. 9 or Figure 12 respectively.The 3rd transistor and the 4th transistor are equivalent to transistor Tr 1 and the Tr2 of phase inverter Cb2 among Fig. 9 or Figure 12 respectively.

In this form, constitute the RC time constant circuit by constituting the transistor gate electric capacity that the 1st circuit for reversing or the 2nd circuit for reversing constitute or the output resistance of this phase inverter.And, constitute time constant circuit by the progression of suitable selection phase inverter or the transistor size of formation phase inverter (the especially long or grid width of grid) with the time constant of wanting.Certainly, the formation of time constant circuit is not limited to above example.For example, when constituting signal generating circuit, also can utilize this transistorized gate capacitance to constitute time constant circuit by transistor.During this constitutes, long by transistorized grid width of suitable selection or grid, can adjust the time constant of time constant circuit.

In addition, image element circuit of the present invention is used for light-emitting device.This light-emitting device possesses: a plurality of image element circuits, and its each image element circuit comprises the light-emitting component that becomes according to the brightness of drive signal level; And data signal line, it transmits the data-signal that time-sharing operation is specified each light-emitting component brightness; Above-mentioned a plurality of image element circuit comprises separately: signal generating circuit, its between the sampling date corresponding with this image element circuit in, generate and drive signal from the corresponding level of data-signal of data signal line sampling; Above-mentioned signal generating circuit comprises: driving transistors, and it generates drive signal by infeeding to gate electrode and the corresponding current potential of data-signal; And time constant circuit, it makes the waveform passivation that infeeds the drive signal of above-mentioned light-emitting component from above-mentioned driving transistors.Constitute according to this,, needn't shorten (between sampling date) during the data-signal input image element circuit, just can prevent each light-emitting component generation luminance errors by the effect the same with image element circuit of the present invention.

In the light-emitting device of preferred configuration of the present invention, above-mentioned light-emitting component, it is luminous because drive signal level surpasses threshold value, above-mentioned time constant circuit is determined time constant, so that be input in the data-signal in the above-mentioned signal generating circuit, than in the short time span of fixed time span, when the signal that surpasses above-mentioned threshold value is input in the above-mentioned signal generating circuit, by the signal attenuation of this time constant circuit output to the threshold value that is lower than above-mentioned light-emitting component.Constitute according to this, can prevent that really postponing to cause light-emitting component for the data-signal between sampling date produces luminance errors.

So on the other hand, for data signal line is additional wiring resistance or stray capacitance arranged.This resistance or electric capacity are along this data signal line, range data signal supply source (routine image processing circuit 30 as shown in Figure 1 or input are from the terminal of these image processing circuit 30 outputting data signals) is big more, and the time constant range data signal supply source of being determined by these resistance or electric capacity is big more.Therefore, for total image element circuit, set the time constant that equates for time constant circuit, the big more time constant of image element circuit of range data signal supply source, drive signal becomes decay, its result, and the characteristic of each light-emitting component (movement) certainly leads to deviation.Therefore, in the form preferred for this invention, the time constant of contained time constant circuit in each image element circuit is determined according to the place that connects this image element circuit in the data signal line.For example, be conceived to the 1st image element circuit, with with data signal line in during apart from the 2nd image element circuit that the path of the data-signal supply source place place shorter than the 1st image element circuit is connected, the time constant of contained time constant circuit is less than the time constant of time constant circuit contained in the 2nd image element circuit in the 1st image element circuit.According to this formation,, in each image element circuit, form equalization, so can suppress the deviation of the characteristic of each light-emitting component because consider resistance that data signal line is additional or electric capacity and time constant circuit both sides' time constant.

In preferred form, the time constant of contained time constant circuit in above-mentioned each image element circuit, determine by each image element circuit, so that in the above-mentioned data signal line, comprise that the time constant of the time constant circuit part from the data-signal supply source to the wiring resistance that connects this image element circuit place and stray capacitance and this image element circuit is roughly the same with total image element circuit.According to this formation, needn't the considered pixel circuit to the position of data signal line, just can make all light-emitting component characteristics consistent accurately.But, during this constitutes, owing to must select respectively, so constitute may be complicated for it to all image element circuits time constant separately.Therefore adopt formation to every group of image element circuit constant seclected time.Promptly, in the light-emitting device of another kind of form, the time constant of contained time constant circuit in above-mentioned each image element circuit, every group of image element circuit determined, so that in the above-mentioned data signal line, the time constant that belongs to time constant circuit in the 1st group of each image element circuit, less than the time constant that belongs to time constant circuit in the 2nd group of each image element circuit, and be connected apart from the path of the data-signal supply source place, place shorter in above-mentioned the 2nd group of image element circuit and the above-mentioned data signal line than above-mentioned the 1st group of image element circuit.And, though only express the 1st and the 2nd group here, only be distinguished into 2 groups formation for a plurality of image element circuits, not to limit scope of the present invention.In the formation that a plurality of image element circuits is distinguished into more than 3 group, a group of selecting from this formation should be among the present invention said the 1st group, and another group should be the 2nd group that says among the present invention.

Light-emitting device of the present invention can be used for various electronic devices.For example, have the irradiation that utilizes light and form in the image processing system of image receiver, can be used as head (line style head) to the photoreceptor irradiation light.As such image processing system, printer or duplicating machine are arranged, or have the compounding machine of these functions concurrently.In this image processing system, the light-emitting device that a plurality of light-emitting component wire ground is arranged preferably.In addition, light-emitting device of the present invention also can be used as the various electronic device display device of said mobile phone or personal computer.In these electronic devices, preferably with the light-emitting device of a plurality of light-emitting components with planar (rectangular) arrangement.That is, this light-emitting device possesses: with a plurality of sampled signal lines (sweep trace) and the corresponding configuration in each point of crossing of a plurality of data signal lines image element circuit of the present invention; The vertical scanning circuit of between sampling date, a plurality of sampled signal lines being selected respectively successively (for example shift register shown in Fig. 8); With will be input to the level sweep circuit (image processing circuit 30 for example shown in Figure 8) of each data signal line to the brightness time-sharing operation data designated signal of each light-emitting component of arranging along each data signal line.

Description of drawings

Fig. 1 is the calcspar of formation of the light-emitting device of expression the present invention the 1st kind of embodiment.

Fig. 2 is the time diagram that is used to illustrate the light-emitting device action.

Fig. 3 is the figure that unit circuit of expression constitutes.

Fig. 4 is used for illustrating the luminous figure of existing unit circuit OLED element mistake.

Fig. 5 is used to illustrate that the unit circuit by present embodiment prevents the figure that mistake is luminous.

Fig. 6 is the figure of the relation of the voltage of expression OLED element and electric current.

Fig. 7 is the figure of the relation of the electric current of expression OLED element and brightness (luminous quantity).

Fig. 8 is that the light-emitting device of the 2nd kind of embodiment of the present invention constitutes the square diagrammatic sketch.

Fig. 9 is the figure that the unit circuit of the 3rd kind of embodiment of expression the present invention constitutes.

Figure 10 is the figure of the version of expression drive signal.

Figure 11 is the figure that the unit circuit of the another kind of form of expression constitutes.

Figure 12 is the figure that the unit circuit of another form of expression constitutes.

Figure 13 is the figure that is used to illustrate to the time constant of the constituent parts circuit of the 4th kind of embodiment of the present invention.

Figure 14 is the longitudinal sectional drawing that presentation video forms the formation of device.

Figure 15 is the longitudinal sectional drawing that the image processing system of the another kind of form of expression constitutes.

Figure 16 is the time diagram that the existing problem points that constitutes is described.

Among the figure: the 10-pixel portion, the 20-control circuit, the 30-image processing circuit, the 40-power circuit, the 50-shift register, G (G1, G2, Gm) unit circuit group, P (P1, P2, Pn) unit circuit, the 71-transmission gate, the 73-latch cicuit, 8 (8a, 8b) image element circuit, the 81-transistor, the 83-OLED element, the Ca-capacitor, Cb (Cb1, Cb2)-phase inverter, Ld1, Ld2 ... the Ldn-data signal line, Ls1, Ls2, Lsm-sampled signal line, La, the Lb-power lead, SR (SR1, SR2 ... SRm)-shift signal, SMP (SMP1, SMP2 ... SMPm)-sampled signal, D (D1, D2 ... Dn)-data-signal, the Sc-drive signal.

Embodiment

＜A～1: the a kind of embodiment 〉

At first the mode of the light-emitting device that image processing system (for example printer) head is adopted describes.Fig. 1 is the calcspar of the formation of this light-emitting device of expression.As shown in Figure 1, light-emitting device is made of pixel portions 10 and its peripheral circuit.Pixel portions 10 is the parts as image processing system head (shaven head of line style).This pixel portions 10 have m the unit circuit group G that directions X arranges (G1, G2 ..., Gm) and with it distinguish the shift register 50 (m is a natural number) of corresponding m position (bit).Unit circuit group G1～Gm comprise separately n the unit circuit P that directions X arranges (P1, P2 ..., Pn).Constituent parts circuit P has the OLED element 83 (with reference to Fig. 3) as light-emitting component.

On the other hand, peripheral circuit comprises control circuit 20 and image processing circuit 30 and power circuit 40.Control circuit 20 generates beginning pulse signal SP and clock signal clk, and outputs to shift register 50.As shown in Figure 2, beginning pulse signal SP is the signal of the initial point formation significant level during main sweep.On the other hand, clock signal clk is the time signal that regulation becomes the main sweep benchmark.As shown in Figure 2, shift register 50 is to split initial pulse signal SP successively according to clock signal clk to be shifted, and generates the shift signal SR1～SRm of m system, according to these shift signals SR1～SRm output m systematic sampling signal SMP1～SMPm.Each shift signal SR (SR1, SR2 ..., SRm) be to become significant level (low level) signal that is equivalent to clock signal clk one-period time span.As shown in Figure 2, each shift signal SRi (i satisfies the integer of 1≤i≤m) form significant level during and next shift signal SRi+1 form significant level during, the semiperiod time span that is equivalent to clock signal clk is carried out repetition.And each sampled signal CMPi is the long-pending signal of NOT logic that is equivalent to the 1st shift signal SRi and next shift signal SRi+1.Therefore, sampled signal SMP1～SMPm, respectively for each be equivalent to Ps between the sampling date of clock signal clk semiperiod (Ps1, Ps2 ..., Psm) form significant level (high level) in order.Sampled signal SMP1～SMPm is input to each unit circuit P of constituent parts circuit group G1～Gm respectively by sampled signal line Ls1～Lsm.

Image processing circuit 30 shown in Figure 1 generates the n system data signal D1～Dn that is equivalent to the contained unit circuit P of a unit circuit group sum.Each data-signal Dj (j satisfies the natural number of 1≤j≤n) specifies m unit circuit group G1～Gm voltage signal of OLED element 83 brightness of contained unit circuit Pj respectively according to the time-sharing operation that puts in order of unit circuit group G1～Gm.Data-signal D1～Dn in the present embodiment equals to form high level and low level any during the unit of Ps time span between sampling date to each respectively.The data-signal Dj indication OLED element 83 of high level is luminous.Low level data-signal Dj indication OLED element 83 extinguishes.These data-signals D1～Dn outputs to data signal line Ld1～Ldn.The unit circuit Pj that unit circuit group G1～Gm comprises separately (adding up to m) is connected with data signal line Ldj jointly.Data-signal Dj by image processing circuit 30 outputs by data signal line Ldj, is fed to the j row constituent parts circuit Pj of constituent parts circuit group G1～Gm.

Power circuit 40 shown in Figure 1 the power supply potential that uses, also generates the power supply potential VHHel and the low low level side power supply potential VLLel of Bi Qi of high-order side in generating shift register 50 logical circuits such as grade.High-order side power supply potential VHHel is fed to power lead La, and low level side power supply potential VLLel is fed to power lead Lb.Total unit circuit P forms common the connection to power lead La and Lb.Connect by these, accept giving of high-order side power supply potential VHHel and low level side power supply potential VLLel.

Then, Fig. 3 is the circuit diagram that expression belongs to the unit circuit Pj formation of unit circuit group Gi.As shown in Figure 3, unit circuit Pj has transmission gate 71.The contained j transmission gate of circuit Pj 71 of itemizing among total unit circuit group G1～Gm, its input terminal forms common connection to data signal line Ldj, this transmission gate 71 is that basis is from shift register 50, the sampled signal SMPi that supplies with by sampled signal line Lsi, the on-off element that data-signal Dj is taken a sample.That is, transmission gate 71 at sampled signal SMPi and the signal that utilizes phase inverter 72 that its logic level is reversed, forms during the significant level, and the state that is in out is input to unit circuit Pj with data-signal Dj.

The lead-out terminal of transmission gate 71 is connected with latch cicuit 73.This latch cicuit 73 has the clock control phase inverter 731 that lead-out terminal is connected with transmission gate 71, is connected the phase inverter 732 that the while lead-out terminal is connected with the input terminal of clock control phase inverter 731 with clock control phase inverter 73 1 lead-out terminals with input terminal.By shift register 50 shift signal Sri that generates and the signal that utilizes phase inverter 74 with its logic level counter-rotating, be fed to each control terminal of clock control phase inverter 731.This clock control phase inverter 731 during level (low level) that shift signal SRi is remained valid, becomes high resistance state, during shift signal SRi is kept non-significant level (high level), with phase inverter performance function.

The lead-out terminal of latch cicuit 73 (lead-out terminal of phase inverter 732) is gone up the input terminal that connects phase inverter 75.The lead-out terminal of this phase inverter 75 is connected with image element circuit 8a by section header Q.Image element circuit 8a comprises transistor (to call " driving transistors " in the following text) 81, OLED element 83 and the capacitor Ca of P channel-type.OLED element 83 is to form the light-emitting component of luminescent layer by organic EL (Electro Luminescent) material between anode (the 1st electrode) and negative electrode (the 2nd electrode).

The source electrode of driving transistors 81 is connected with the power lead La that supplies with high-order side power supply potential VHHel, and its drain electrode is connected with the anode of OLED element 83.The negative electrode of OLED element 83 is connected with the power lead Lb that supplies with low level side power supply potential VLLel.And capacitor Ca disposes side by side with respect to OLED element 83.That is, the electrode a of capacitor Ca is connected with the anode of OLED element 83, and another electrode b is connected with the negative electrode (or power lead Lb) of OLED element 83.

Fig. 4 imposes on the voltage of OLED element 83 and flows into relation curve between the electric current of OLED element 83, and Fig. 5 is the relation curve that flows between the brightness (luminous quantity) of the electric current of OLED element 83 and OLED element 83.As shown in Figure 4 and Figure 5, when the voltage that imposes on OLED element 83 was lower than threshold value Vth, electric current reached at 0 o'clock, and OLED element 83 extinguishes (brightness is 0).And voltage flows into OLED element 83 with the corresponding electric current of this voltage when surpassing threshold value Vth, its as a result OLED element 83 to send light with the proportional brightness of electric current.In the formation shown in Figure 3, when node Q remained on low level, driving transistors 81 became the state of connection, so apply above the voltage of threshold value Vth and luminous to OLED element 83.On the other hand, when node Q remained on high level, driving transistors 81 became the state of disconnection, and the voltage that imposes on OLED element 83 is being lower than threshold value Vth, its result, and OLED element 83 extinguishes.Below expression is imposed on OLED element 83 voltages signal note make " drive signal Sc ".

Then the action to constituent parts circuit P describes.In addition, below especially emphatically the action to the unit circuit P1 that belongs to unit circuit group G1 describe.Also double as explanation of action to other unit circuit P.

At first, shown in Figure 2 from moment t1 to moment t2, because shift signal SR1 remains on low level, so clock control phase inverter 731 becomes high impedance status.Because sampled signal SMP1 is a low level, transmission gate 71 becomes disconnection (OFF) state again.Then from clock t2 to clock t3, shift signal SR1 keeps low level, when the while, sampled signal SMP1 became high level, clock control phase inverter 731 remained on high impedance status, 71 of transmission gates become on-state.Therefore, at this moment between point, the data-signal D1 that supplies with data signal line Ld1 is input to unit circuit P1 by transmission gate 71.

Then, after clock t3, after shift signal SR1 formed high level, 731 beginnings of clock control phase inverter were with phase inverter (inverter) performance function.After sampled signal SMP1 became off-state, transmission gate 71 carried out the transition to off-state.Therefore, data-signal D1 end of input is imported beginning up to data-signal D1 later on next time, and the logic level of data-signal D1 remains in the latch cicuit 73.

Therefore, as long as data-signal D1 is unlike want constant time lag, then as among Fig. 2 with shown in " D1 (not having delay) ", this data-signal D1, in the level of sampled signal SMP1～SMPm becomes between the whole district of Ps between the sampling date of significant level, all keep and the corresponding level of each OLED element 83 brightness.Yet, as among Fig. 2 with shown in " D1 (delay is arranged) ", for data-signal D1, because the voltage among the data signal line Ld1 reduces and various reasons such as waveform passivation all can cause time span delay Δ d.The OLED element 83 that belongs to the unit circuit P1 of unit circuit group G1 and unit circuit group G3 respectively carries out luminous, when the OLED element 83 of unit circuit P1 that imagination belongs to unit circuit group G2 extinguishes, owing to the delay of data-signal D1 causes that following change takes place the voltage of node Q.

At first, Ps1 between sampling date, data-signal D1 are input among the unit circuit P1 of unit circuit group G1.This data-signal D1 is in the timing of the initial point length time delay Δ d of Ps1 between sampling date, carry out the transition to low-voltage, even but remain on Ps1 destination county between sampling date in the latch cicuit 73, its logic level also remains on low level, so node Q voltage of this unit circuit P1, from than Ps1 initial point between sampling date only time delay length Δ d timing, to input data signal D1 next time, all remain under the low level.Therefore, belong to the OLED element 83 of the unit circuit P1 of unit circuit group G1, by data-signal D1 appointment like that, in desired time span, continue to light.It also is the same belonging to the 1st of a unit circuit group G3 circuit P1 that itemizes.

On the other hand, in the Ps2, data-signal D1 is input in the unit circuit P1 that belongs to unit circuit group G2 between the sampling date of sampled signal SMP2 formation significant level.If data-signal D1 does not postpone, between sampling date in the whole interval of Ps2, data-signal D1 remains under the high level that indication OLED element 83 extinguishes.So on the other hand, as above-mentioned, data-signal D1 is only behind length Δ d time delay, during from Ps2 initial point between sampling date to elapsed time length Δ d in the Td, data-signal D1 remains on low level (i.e. the level that OLED element 83 indications of the unit circuit P1 that belongs to unit circuit group G1 are lighted), through carrying out the transition to original high level again behind the Td during this period.Between sampling date in the Ps2, the clock control phase inverter 731 of latch cicuit 73 is with phase inverter performance function, during in the Td, node Q becomes low level, the driving transistors 81 of image element circuit 8a is in on-state.

At this, do not dispose in the existing formation of capacitor Ca, during in the Td, when driving transistors 81 carried out the transition to on-state, as shown in Figure 6, the voltage of drive signal Sc (promptly imposing on the voltage of OLED element 83) surpassed the threshold value Vth side power supply potential VHHel that attains to a high place.Therefore, can to produce mistake luminous for the former OLED element 83 that should keep the unit circuit group G2 that extinguishes.Opposite with it, in the present embodiment, by constituting the Rc time constant circuit with the capacitor Ca of OLED element 83 configurations arranged side by side and the resistance components and the wiring resistance of this OLED element 83.Therefore, as shown in Figure 7, during the drive signal Sc rising edge of Td initial point be passivated.And then, during the destination county of Td because node Q carries out the transition to low level, driving transistors 81 becomes off-state, before the level of drive signal Sc reaches threshold value Vth, during the terminal point of Td begin to reduce.Therefore, can not surpass threshold value Vth in the interval of the level of drive signal Sc Td during whole, its result, it is luminous that mistake can not take place OLED element 83.Like this, the capacitor Ca in the present embodiment can make the passivation of drive signal Sc waveform, brings into play function as preventing the OLED element 83 luminous time constant circuits of mistake.Therefore, the electrostatic capacitance of capacitor Ca preferably is selected in following degree, that is, be equivalent to data-signal D1 retardation Δ d peaked whole during in the Td interval, the level of drive signal Sc is no more than the threshold value Vth of OLED element 83, so that the waveform passivation of drive signal Sc.

According to present embodiment because the waveform of drive signal Sc is by capacitor Ca passivation, even with the delay of data-signal D1 as reason, driving transistors 81 temporarily becomes on-state, also can avoid the mistake of the OLED element 83 that this reason causes luminous.Therefore, adopt in the image processing system of light-emitting device,, can form high-quality image by controlling exposure accurately to photoreceptor at head.Insert at interval because there is no need between the sampling date of front and back Ps, so even the cycle that data-signal Dj is taken a sample very in short-term, also can fully fetch data-signal Dj for constituent parts circuit Pj.And then, according to present embodiment,, just can obtain these effects by constituting extremely easily of what is called configuration capacitor Ca.

As above explanation, the image element circuit 8a of present embodiment, comprise OLED element 83 (light-emitting component), form the power lead La that is electrically connected and between power lead La and anode, control the P channel-type driving transistors 81 of OLED element 83 drive currents with the anode of OLED element 83.And each important document of the gate electrode from sampled signal line Lsi to driving transistors 81 (transmission gate 71, phase inverter 72, latch cicuit 73 and phase inverter 75) is as sample circuit performance function.This sample circuit is the sampled signal SMPi that supplies with according to by sampled signal line Lsi, from data signal line Ldj data-signal Dj is taken a sample, and will supply with the gate electrode of driving transistors 81 with the corresponding current potential of data-signal Dj.

As the present embodiment example, the RC time constant circuit preferably is configured between the anode (the 1st electrode) of power lead La and OLED element 83.In other words, can not there be the RC time constant circuit from sample circuit (especially being positioned at the phase inverter 75 of last level) to the interval of driving transistors 81 gate electrodes.According to this formation, for example, and the constituent ratio that has the RC time constant circuit between sample circuit and the driving transistors 81, really can be fully to constituent parts circuit Pj input data signal Dj.So as present embodiment, the formation that has the RC time constant circuit between the anode according to power lead La and OLED element 83, as above explanation, even reason owing to data-signal Dj delay, during in the Td driving transistors 81 carry out the transition to on-state, it is luminous also to prevent that OLED element 83 from producing mistake by the RC time constant circuit.

＜B: the 2nd kind of embodiment 〉

Then the mode as the light-emitting device of the display device of various electronic devices is described with reference to Fig. 8.In the present embodiment, pay prosign with the 1st kind of important document that embodiment is the same, its explanation is suitably omitted.

As shown in Figure 8, this light-emitting device has extension existence on directions X, m bar sampled signal line (sweep trace) Ls1～Lsm that is connected with each output stage of shift register 50, there is the n bar data signal line Ld1～Ldn that is connected with each output stage of image processing circuit 30 with on the Y direction, extending.Infall allocation unit circuit P at each sampled signal line Ls1～Lsm and each data signal line Ld1～Ldn.Therefore, these unit circuits P is arranged in rectangular with the capable n row of m on directions X and Y direction.The formation of constituent parts circuit P and the function of each peripheral circuit are the same with the 1st kind of embodiment with effect.

Along each data signal line Ld1～Ldn, the m that arranges on the Y direction unit circuit P has green or blue any luminous OLED element 83 respectively.For example, the constituent parts circuit P of the 1st row constituent parts circuit P that possesses red OLED element 83, the 2 row constituent parts circuit P that possesses green OLED element 83, the 3 row possesses blue OLED element 83.Power circuit 40, except generating low level side power supply potential VLLel, also generate the high-order side power supply potential VHHel[R that supplies with to constituent parts circuit P with red corresponding row], the high-order side power supply potential VHHel[G that supplies with to constituent parts circuit P with green corresponding row] and to the high-order side power supply potential VHHel[B of the constituent parts circuit P supply of the corresponding row of blueness].

In above formation, supply with the sampled signal SMPi of sampled signal line Lsi from shift register 50, when carrying out the transition to significant level by Psi between sampling date, the transmission gate 71 that belongs to the capable n of an i unit circuit P becomes on-state simultaneously.By data-signal D1～Dn of image processing circuit 30 each data signal line Ld1～Ldn of supply, Psi between this sampling date is input in the constituent parts circuit P from transmission gate 71.The unit circuit P of present embodiment is as Fig. 3 example, because comprise the capacitor Ca that disposes side by side with OLED element 83, so even data-signal Dj makes delay to Psi between sampling date, can prevent that also this delay from causing that the mistake of OLED element 83 is luminous.Therefore, can control the brightness of each OLED element 83 accurately, realize superior display quality.Example herein is to be control OLED element 83, has disposed the light-emitting device of the active matrix mode of driving transistors 81 in unit circuit P, and still, the light-emitting device that does not have the passive matrix mode of this on-off element also is suitable for the present invention.

＜C: the 3rd kind of embodiment 〉

Following with reference to Fig. 9～Figure 12, other forms of unit circuit P are shown.Below in each form with the same important document of the 1st and the 2nd embodiment, pay identical symbol, its explanation is suitably omitted.

＜C～1: the a kind of form 〉

Fig. 9 is the figure that the 1st kind of morphologic unit circuit P (pj) of expression present embodiment constitutes.As shown in Figure 9, the image element circuit 8b of this morphologic unit circuit P has 2 phase inverter Cb (Cb1 and Cb2), has replaced driving transistors shown in Figure 3 81 and capacitor Ca.Each phase inverter Cb comprises each drain electrode P channel transistor connected to one another Tr1 and n channel transistor Tr2.The source electrode of transistor Tr 1 is connected with power lead La, and the source electrode of transistor Tr 2 is connected with power lead Lb.The input terminal of phase inverter Cb1 is connected with the lead-out terminal of phase inverter 75, and the lead-out terminal of phase inverter Cb1 is connected with the input terminal of phase inverter Cb2.The lead-out terminal of phase inverter Cb2 is connected with the anode of OLED element 83.

In this form, constitute time constant circuit by each gate capacitance and the output impedance of transistor Tr 1 and Tr2.Therefore, phase inverter Cb1 and phase inverter Cb2, as the device that generates drive signal Sc according to data-signal (driving transistors 81 in the 1st kind of embodiment and the 2nd kind of embodiment) performance function, simultaneously, also as the time constant circuit performance function that makes the waveform passivation of this drive signal Sc.When being convenient to distinguish concerning between drive signal Sc and phase inverter Cb1 and the Cb2, generate the function of drive signal Sc according to data-signal Dj, can realize by phase inverter Cb1 (the perhaps transistor Tr 1 or the Tr2 of phase inverter Cb1 part), and make the function of the waveform passivation of this drive signal Sc, can realize by phase inverter Cb2 (or phase inverter Cb1 and Cb2 both sides).

Shown in part (a) among Figure 10, the current potential of the input terminal of phase inverter Cb1 during rising edge and trailing edge among the Td become rapid square wave, from the drive signal Sc of phase inverter Cb1 output, shown in part (b) among Figure 10, the logic level counter-rotating becomes the passivation waveform simultaneously.And from the drive signal Sc of phase inverter Cb2 output, shown in part (c) among Figure 10, and then the waveform passivation, during whole, in the Td, become the signal that is lower than OLED element 83 threshold values Vth.Therefore, the delay of the factor number of it is believed that Dj, cause node Q during be transited into low level in the Td, the same with the 1st kind of embodiment, can avoid the mistake of OLED element 83 luminous.Like this, in this form, phase inverter Cb (especially phase inverter Cb2) is as time constant circuit performance function.By the time constant of suitably selected this time constant circuit, can adjust sum and transistor Tr 1 among each phase inverter Cb and the Tr2 characteristic (the long and grid width of grid) of the phase inverter Cb among the image element circuit 8b.

＜C～2: the 2 kinds of forms 〉

Figure 11 is the figure that constitutes of the unit circuit P of the 2nd kind of form of expression present embodiment (j that belongs to unit circuit group Gi itemize a circuit Pj).As shown in Figure 11, the unit circuit P of this form except having the image element circuit 8a the same with Fig. 3, is also had a transistor 77 and keep electric capacity 78.Transistor 77 is transistors of n channel-type, and the source electrode is connected with data signal line Ldj, and simultaneously, drain electrode is connected with the gate electrode of the driving transistors 81 of image element circuit 8a.Supply with sampled signal SMPi by sampled signal line Lsi to these transistor 77 gate electrodes.And keep electric capacity 78 is that an end is connected with the gate electrode of driving transistors 81, the electric capacity that the while other end is connected with power lead La (or other power leads).Image element circuit 8a, the same with the formation of Fig. 3, have the capacitor Ca that disposes side by side with OLED element 83.

During this constituted, owing to supply with sampled signal SMPi, when transistor 77 carried out the transition to on-state, at this constantly, the logic level of the data-signal Dj that supplies with to data signal line Ldj imposed on the gate electrode of driving transistors 81.In addition, by keeping electric capacity 78 to keep this logic level, so sampled signal SMPi becomes non-significant level, after transistor 77 was transited into off-state, driving transistors 81 remained on the state of importing among the Ps between its preceding sampling date in the unit circuit P corresponding with data-signal Dj.In this form, also the same with the 1st kind of embodiment, owing to the capacitor Ca that is provided with in image element circuit 8a with time constant circuit performance function, the mistake of the OLED element 83 that causes so can prevent the factor number of it is believed that Dj from postponing is luminous.

＜C～3: the 3 kinds of forms 〉

Figure 12 is the figure of the formation of the 3rd kind of morphologic unit circuit P of expression.As shown in Figure 12, the unit circuit P of this form comprises the image element circuit 8b (Fig. 9) with 2 phase inverter Cb1 and Cb2, has the image element circuit 8a (Figure 11) of capacitor Ca with replacement.Just as to the explanation of the 1st kind of form, this form can prevent also that the factor number of it is believed that Dj from postponing and the mistake of the OLED element 83 of initiation is luminous.

＜C～4: other form 〉

The formation of unit circuit P of the present invention (especially time constant circuit formation) is not limited in above-mentioned example.For example, also can adopt time constant circuit appropriate combination with the various forms of above explanation.That is, for example, also can adopt the formation that capacitor Ca and phase inverter Cb are set in unit circuit P.In addition, also can adopt the formation of between driving transistors 81 and OLED element 83, inserting resistance.During this constitutes,, constitute the time constant circuit of the waveform passivation that makes drive signal Sc by the capacitive component of resistance between driving transistors 81 and OLED element 83 and OLED element 83 and the stray capacitance of distribution.Therefore, the resistance value of selected this resistance so that the level of drive signal Sc during be no more than the threshold values Vth of OLED element 83 in the Td.In addition, the formation of unit circuit P can change arbitrarily.That is, so long as it is just passable to supply with constituting of drive signal Sc to OLED element 83 according to the data-signal Dj by data signal line Ldj input, in the formation of part how regardless of other.

In addition, in each above mode, for convenience of explanation, will comprise image element circuit 8 (8a or 8b), fetch mechanism's (transmission gate 71 of Fig. 3 and transistor 77 of Figure 11) of data-signal Dj and keep the part of mechanism's (latch cicuit 73 of Fig. 3 or maintenance electric capacity 78 of Figure 11) of data-signal Dj to remember the circuit Pj of office in the lump by data signal line Ldj.Yet also can will comprise the image element circuit 8 (8a or 8b) of each form and fetch the mechanism of data-signal Dj or, can be used as image element circuit of the present invention and hold the part of the mechanism of its maintenance.

＜D: the 4th kind of embodiment 〉

Below the light-emitting device of the 4th kind of embodiment of explanation the present invention constitutes.In the present embodiment, pay identical symbol with the 1st～3rd kind of important document that embodiment is the same, its explanation is suitably omitted.

Figure 13 is in the light-emitting device of each embodiment, extract out 1 data signal line Ldj with the figure of its m that is connected jointly unit circuit Pj.As shown in the drawing, the additional wiring resistance R that himself is arranged combines additional parasitic capacitance C with other key element electric capacity simultaneously on data signal line Ldj.Because of the time constant that these wiring resistances R or stray capacitance C cause, from the supply source processes pixel circuit 30 of data-signal Dj, far away more along this data signal line Ldj position, time constant is big more.Therefore, time constant circuit (capacitor Ca or phase inverter Cb) in the image element circuit 8 (8a or 8b) of total unit circuit Pj is set the time constant that equates, the drive signal Sc of the unit circuit Pj of range image treatment circuit 30, degree of passivation by the time constant cause becomes big, and its result can produce the problem of the brightness of each OLED element 83 along data signal line Ldj formation deviation.In the present embodiment, among the data signal line Ldj, time constant with time constant circuit among the unit circuit Pj (image element circuit 8) that is connected near the position of image processing circuit 30 is set at: greater than with distance image processing circuit 30 numerical value of the time constant of the time constant circuit among the unit circuit Pj (image element circuit 8) that is connected of distant positions slightly.More specifically say, belong to the timeconstant i of time constant circuit of the unit circuit Pj4 of constituent parts circuit group Gi, be chosen to be satisfy so-called τ 1＞τ 2＞... the relation of＞τ m.As mentioned above, timeconstant i is determined by the electrostatic capacitance of capacitor Ca or the sum of phase inverter Cb (or characteristic of transistor Tr 1 and Tr2).According to this formation, owing to can make the drive signal Sc degree of passivation of wiring resistance R and stray capacitance C cause, the summation of the drive signal Sc degree of passivation that causes with time constant circuit by unit circuit P, roughly approaching identical for the unit circuit Pj of summation, so can suppress along the luminance deviation of data signal line Ldj.

Though herein example be to total unit circuit Pj individually seclected time constant formation, also can be formation to every group of unit circuit Pj constant seclected time.For example, centre with directions X, m the unit circuit Pj that is connected with data signal line Ldj jointly is divided into 2 groups, wherein, be positioned at timeconstant a near one group of unit circuit Pj of image processing circuit 30 sides, with be positioned at the timeconstant b of one group of unit circuit Pj in distally slightly, it constitutes the relation that satisfies τ a＞τ b by the time constant of time constant circuit among every group of selected constituent parts circuit Pj.And though m unit circuit Pj is divided into 2 groups herein, sum and its differentiation mode of group are arbitrarily.For example, m unit circuit Pj is divided into group more than 3, near the constituent parts circuit Pj of 30 1 groups of image processing circuits, the time constant of its time constant circuit is more little more.

＜E: other form 〉

Though it is that the electrode b of capacitor Ca is connected with the negative electrode of OLED element 83 that the example among Fig. 3 and Figure 11 constitutes, the link of this electrode b can change arbitrarily.That is, best formation is the current potential that applies constant to electrode b.The conductivity type of contained driving transistors 81 (or transistor 77 of Figure 11 and Figure 12) can change arbitrarily among the unit circuit P.

In each embodiment, though example utilize the light-emitting device of OLED element 15, the present invention also is applicable to the light-emitting device that utilizes other light-emitting components.For example, the present invention also is applicable to the light-emitting device that utilizes inorganic EL element, electric field transmitted display (FED:Field Emissiom Display), surface conduction type evaporation of electron screen (SED:Surface～Conduction Electron～emitterDisplay), ballistic electron emission display (BSD:Ballistic electron Surface emittingDisplay) or utilize the various light-emitting devices such as display device of light emitting diode.

＜F: electronic device 〉

The light-emitting device of example can be used for various electronic devices in each embodiment.The formation of the image processing system of a routine electronic device of the present invention below is described.

Figure 14 is the longitudinal sectional drawing of formation of image processing system that has utilized the light-emitting device of each embodiment.This image processing system structure becomes 4 same organic EL array exposure head 20K, 20C, 20M, 20Y that constitute, be configured in respectively on the exposure position of 4 same corresponding photoreceptor rotary drum (image carrier) 120K that constitute, 120C, 120M, 120Y, form device with the series system composing images.Organic EL array exposure head 20K, 20C, 20M, 20Y are made of the pixel portions 10 of the light-emitting device that relates in each embodiment.

As shown in figure 14, this image processing system is provided with drive roller 121 and driven roller 132, and has the intermediate duplication (duplicating) that drives by direction of arrow circulation among the figure and be with 130.With respect to this intermediate duplication band 130, as 4 image carriers with the prescribed distance configuration, configuration has 120K, 120C, 120M, the 120Y of photographic layer on its outer peripheral face.Be attached to K, C, M, Y behind the label and be respectively deceive, bluish-green, fuchsin, yellow, the photoreceptor of black, bluish-green, the fuchsin of expression, yellow usefulness respectively.Miscellaneous part too.Driving is rotated in the driving of photoreceptor 120K, 120C, 120M, 120Y and intermediate duplication band 130 simultaneously.

Around each photoreceptor 120 (K, C, M, Y), be respectively equipped with of the present invention as above-mentioned organic EL array exposure head 20 (K, C, M, Y), this photohead makes the charged the samely Charging system (corona charging device) 211 (K, C, M, Y) of the outer peripheral face of photoreceptor 120 (K, C, M, Y), with to by the charged the samely charged outer peripheral face of this Charging system 211 (K, C, M, Y), synchronous with the rotation of photoreceptor 120 (K, C, M, Y), carry out line sweep successively.

In addition, also have developing apparatus 21 4 (K, C, M, Y), it pays the developer toner on the electrostatic latent image that is formed by this organic EL array exposure head 20 (K, C, M, Y), but forms video (toner picture).

At this, each organic EL array exposure head 20 (K, C, M, Y) is set, make the bus of the array direction of organic EL array exposure head 20 (K, C, M, Y) along photoreceptor rotary drum 120 (K, C, M, Y).And, the luminous energy spike of each organic EL array exposure head 20 (K, C, M, Y) sensitivity spike long and photoreceptor 120 (K, C, M, Y) is long, be set at roughly consistent.

Developing apparatus 214 (K, C, M, Y), for example, as developer, use a kind of toner of non magnetic composition,, for example deliver on the development roller by feed roller with the developer of this kind composition, by the thickness of limiting scraper restriction attached to the developer on the developer roll sub-surface, by making this development roller contact or be squeezed into certain thickness, adhere to developer according to the potential level of photoreceptor 120 (K, C, M, Y), thereby develop as the toner picture with photoreceptor 120 (K, C, M, Y).

That monotone toner picture by 4 such looks forms that the position forms is black, bluish-green, each toner picture of fuchsin, Huang, once copies on the intermediate duplication band 130 in order.Coincident configuration becomes panchromatic in order on intermediate duplication band 130.By paper injection roller 203, supply with recording medium 202 from paper feeding cassette 201 each ground, be transported to secondary and duplicate on the roller 136.Toner picture on the intermediate duplication band 130 duplicates on the roller 136 at secondary, and secondary copies to on the recording mediums such as paper 202, and a pair of photographic fixing roller 137 by photographic fixing portion carries out photographic fixing to recording medium 202.Subsequently, recording medium 202 is discharged on row's paper disc that device top forms by a pair of exit roller 138.

So, the image processing system of Figure 14 as writing mechanism, owing to used organic EL array, compares with the situation of using laser scanning optical system, can obtain miniaturization.

Below other embodiments of image processing system of the present invention are described.

Figure 15 is the longitudinal sectional drawing of image processing system.Among Figure 15, in image processing system, as the main composition parts, be provided with: the developing apparatus 161 that rotation constitutes, bring into play the photoreceptor rotary drum 165 of function, the photohead 167 that is provided with organic EL array, intermediate duplication band 169, carry road 174, the heated rollers 172 of fuser, sheet feed stacker 178 as image carrier with paper.Photohead 167 is made of the pixel portions 10 of the light-emitting device that relates in the respective embodiments described above.

Developing apparatus 161, its development rotating part 161a is the center with axle 161b, counter rotation.The inside of development rotating part 161a is divided into 4 parts, is arranged to Huang (Y), bluish-green (C), fuchsin (M), black (K) 4 colours formation unit respectively.Each picture that development roller 162a～162d and toner supply roller 163a～163d are configured in 4 looks respectively forms in the unit.By limiting scraper 164a～164d restriction toner fixed thickness.

Make photoreceptor rotary drum 165 charged by charged device 168, by diagram abridged CD-ROM drive motor, for example reverse driving development of stepper motor roller 162a.Intermediate duplication band 169 is hanged up between driven roller 170b and drive roller 170a, and drive roller 170a is connected with the CD-ROM drive motor of photoreceptor rotary drum 165, to intermediate duplication band transferring power.Utilize the driving of this CD-ROM drive motor, make the drive roller 170a and photoreceptor rotary drum 165 backwards rotation of intermediate duplication band 169.

Carrying in the road 174 with paper, be provided with a plurality of conveying rollers and a pair of exit roller 176 etc., carry and use paper.Carry the one-sided image (toner picture) that is held on the intermediate duplication band 169, the position of duplicating roller 171 at secondary is replicated in on the single face of paper.Secondary duplicates roller 171 and utilizes 169 contacts of clutch coupling and intermediate duplication band and separate, and opens clutch coupling and contacts with intermediate duplication band 169, and copying image is on paper.

As the above-mentioned paper of using that has duplicated image, then carry out photographic fixing and handle with fuser with fixing heater.Be provided with heated rollers 172, impression roller 173 in the fuser.Use paper after photographic fixing is handled, be incorporated between a pair of exit roller, undertaken by arrow F direction.State begins thus, and when a pair of exit roller 176 was pressed against the direction rotation, with the counter-rotating of paper direction, G carried out two-face printing landline 175 in the direction of arrows.Use paper,, take out by paper injection roller 179 each ground from paper feeding disk 178.

In the paper landline, drive the CD-ROM drive motor of conveying roller, for example use the brushless electric machine (brushless) of low speed.Intermediate duplication band 169 need carry out color shift correction etc. thus, so use stepper motor.These motors are by controlling from the signal of not shown control gear.

At illustrated state, on photoreceptor rotary drum 165, form the electrostatic latent image of yellow (Y), by on development roller 162a, applying high-tension electricity, on photoreceptor rotary drum 165, form yellow image.When the dorsal part of yellow and table side image all carry when being held on the intermediate duplication band 169, development rotating part 161a revolves and turn 90 degrees.

Intermediate duplication band 169 rotations 1 circle, be fed back into the position of photoreceptor rotary drum 165, then on photoreceptor rotary drum 165, form 2 images of blue-green (C), this doubling of the image is carried and is held in intermediate duplication band 169 and uploads on the yellow image of holding, development rotating part 161 is revolved to be turn 90 degrees, after the intermediate duplication band was held image in 169 years, repeat to revolve the processing of turning around.

For carrying the coloured image of holding 4 looks, intermediate duplication band 169 will rotate 4 circles, subsequently, control position of rotation once more, in the position that secondary duplicates roller 171, duplicating image on paper, the paper of using by paper feeding disk 178 supplies, carried by landline 174, secondary duplicates the position of roller 171, is using duplicating color image on the single face of paper.Duplicated the paper of using of image on the single face, reversed, in transport way, carried out standby by a pair of exit roller 176.Subsequently, in suitable timing, be transported to the position that secondary duplicates roller 171, duplicating color image on another side with paper.On housing 180, be provided with vent fan 181.

In the image processing system of above each form, by OLED element 83, to the light quantity of image carrier (for example photoreceptor rotary drum 165 on the photoreceptor rotary drum 120 of Figure 14 (K, C, M, Y) and Figure 15) irradiation, surpass during fixed threshold value Lth, carry out sensitization and form electrostatic latent image.At this, irradiation is equivalent to the light quantity of threshold value Lth for image carrier, at the voltage Vth1 that imposes on OLED element 83 during greater than the threshold value Vth of OLED element 83, the factor number of it is believed that Dj postpones to cause that the level of drive signal Sc surpasses voltage Vth, even OLED element 83 is luminous, as long as this level is lower than voltage Vth1 (that is, as long as the light quantity of shining to image carrier is the light quantity that is lower than threshold value Lth), the delay of data line Dj just can not exert an influence to the electrostatic latent image that forms on the image carrier.Therefore, when light-emitting device of the present invention is used for image processing system that light writes, its constitute also can be seclected time constant circuit time constant the time, the level of drive signal Sc during making in the Td decays to the level (also can be the level that surpasses threshold value Vth) of the threshold value Vth1 that is lower than image carrier sensitization.

Above-mentioned light-emitting device also is applicable to image read-out.This image read-out is characterized in that, possesses the luminous component to the object irradiation light; With the light that reads by the object reflection, the reading section of output image signal; Above-mentioned light-emitting device is used for luminous component.At this, can be that luminous component moves, reading section is fixing, also can be that luminous component and reading section become one and mobile.Under the latter event, reading section is made of TFT, also reading section and luminous component can be formed on 1 substrate.As such image read-out, can use scanner or bar code reader.

Be suitable for the electronic device of light-emitting device of the present invention, be not limited to image processing system or image read-out.For example, as the display device in the various electronic devices, can utilize the light-emitting device of each embodiment.As such electronic device, enumerate a guy's computing machine, mobile phone, portable type information terminal (PDA:Personal Digital Assistants), digital camera, televisor, video camera, automobile navigation apparatus, pager, electronic notebook, Electronic Paper, counter, word processor, worktable, videophone, POS terminal, printer, scanner, duplicating machine, video player, have the instrument of touch-screen etc.In these electronic devices, preferably adopt as the explanation of the 2nd kind of embodiment, with the light-emitting device of a plurality of unit circuit P of planar arrangement.

Claims (12)

1. image element circuit is characterized in that possessing:

Light-emitting component, it comprises the 1st electrode and the 2nd electrode, becomes and the corresponding brightness of the level of drive signal; With

Signal generating circuit, it generate to specify the drive signal of the brightness of described light-emitting component according to data-signal,

Described signal generating circuit comprises:

Sample circuit, its described data-signal of between sampling date, taking a sample;

Driving transistors, it is connected to described the 1st electrode, and by supplying with and the corresponding current potential of described data-signal of taking a sample to gate electrode, generates drive signal; With

Time constant circuit, it makes the drive signal waveform passivation of supplying with to described light-emitting component from described driving transistors.

2. image element circuit according to claim 1 is characterized in that, described light-emitting component carries out luminous above threshold value by the level that makes drive signal,

Described time constant circuit is determined time constant, so that in than the short time span of the retardation of described data-signal when described signal generating circuit input surpasses the signal of described threshold value, make the level from the signal attenuation of this time constant circuit output to the threshold value that is lower than described light-emitting component, the retardation of described data-signal is that described data-signal is to the retardation between the described sampling date in the described drive signal.

3. image element circuit according to claim 1 is characterized in that,

Possess the power lead that is electrically connected with described the 1st electrode by described driving transistors,

Described time constant circuit is configured between described the 1st electrode and described the 2nd electrode.

4. image element circuit according to claim 3 is characterized in that,

Described time constant circuit comprises that a side electrode is connected with the 1st electrode of described light-emitting component, and applies the capacity cell of constant current potential to the opposing party's electrode.

5. image element circuit according to claim 4 is characterized in that,

Described time constant circuit comprises the resistance between described power lead and described the 1st electrode.

6. image element circuit according to claim 1 is characterized in that,

Described driving transistors is the 1st circuit for reversing that is made of the 1st transistor of complementary type and the 2nd transistor,

Described time constant circuit is the 2nd circuit for reversing that is made of the 3rd transistor of complementary type and the 4th transistor,

Supply to the input end of described the 1st circuit for reversing with the corresponding current potential of data-signal, the output terminal of described the 1st circuit for reversing is connected in the input end of described the 2nd circuit for reversing, and the output terminal of described the 2nd circuit for reversing is connected in described the 1st electrode.

7. light-emitting device is characterized in that possessing:

A plurality of image element circuits, it comprises the 1st electrode and the 2nd electrode, comprises the light-emitting component that becomes with the corresponding brightness of level of drive signal separately; With

Data signal line, it transmits the data-signal of specifying the brightness of each light-emitting component by time-sharing operation,

Described a plurality of image element circuit comprises separately: signal generating circuit, its between the sampling date corresponding with this image element circuit in, generate and drive signal from the corresponding level of data-signal of described data signal line sampling,

Described signal generating circuit comprises: driving transistors, and it is connected to the 1st electrode, and by supplying with and the corresponding current potential of data-signal to gate electrode, generates drive signal; And time constant circuit, it makes the drive signal waveform passivation of being supplied with to described light-emitting component by described driving transistors.

8. light-emitting device according to claim 7 is characterized in that,

Described light-emitting component carries out luminous above threshold value by the level that makes drive signal,

Described time constant circuit is determined time constant, so that in than the short time span of the retardation of described data-signal when described signal generating circuit input surpasses the signal of described threshold value, level from the signal attenuation of this time constant circuit output to the threshold value that is lower than described light-emitting component, the retardation of described data-signal is that described data-signal is to the retardation between the described sampling date in the described drive signal.

9. light-emitting device according to claim 7 is characterized in that,

In described a plurality of image element circuit, the time constant of contained time constant circuit in the 1st image element circuit, less than with described data signal line in, apart from the path of data-signal supply source time constant than the 2nd image element circuit that is connected on the short place of described the 1st image element circuit.

10. light-emitting device according to claim 9 is characterized in that,

The time constant of contained time constant circuit in described each image element circuit, determine by each image element circuit, so that in the described data signal line, comprise and the time constant of the time constant circuit part of the wiring resistance that connects from the data-signal supply source to this image element circuit till place and stray capacitance and this image element circuit total image element circuit identified.

11. light-emitting device according to claim 9 is characterized in that,

The time constant of contained time constant circuit in described each image element circuit, according to pixels each group of circuit is determined, so that in described a plurality of image element circuit, the time constant that belongs to the 1st group of time constant circuit in each image element circuit, less than in the described data signal line, belong to apart from the path of data-signal supply source time constant than the time constant circuit in the 2nd group each image element circuit that connects on the short place of described the 1st group of each image element circuit.

12. an electronic device is characterized in that, possesses the light-emitting device described in each of claim 7～claim 11.

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