CN1099095C - Display control method - Google Patents
Display control method Download PDFInfo
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- CN1099095C CN1099095C CN96104503A CN96104503A CN1099095C CN 1099095 C CN1099095 C CN 1099095C CN 96104503 A CN96104503 A CN 96104503A CN 96104503 A CN96104503 A CN 96104503A CN 1099095 C CN1099095 C CN 1099095C
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Abstract
A display (10) applys a show driving circuit, which can employ the reduction of the working frequency used in row (12) information in the image to minimize the power consumption, the reduction of working frequency is relied on a current level showing time which also has data to display, thus making the the row timing signal (32) postion near the terminal of the level showing time(38, 39, 48, 49).
Description
Technical field:
The present invention relates to display equipment, be specifically related to the novel control of display equipment.
Background technology:
Various display equipments for example LCD, light emitting diode indicator and electroluminescent device display use the matrix addressing to control already.The matrix addressed display device has many row and many row usually, and they form an X-Y matrix.Activating a concrete row and concrete row causes a visual picture point occurring in the joining or the point of crossing of this row and these row.Usually each row is energized in order, and data side by side are added to each and list, therefore, all row are also side by side energized when each row is energized.
It is exactly power consumption that there is a problem in this matrix addressing.In the electroluminescent device display, the major part of power consumption is the capacitive power losses of being followed when the column capacitance of connecting all each row also turn-offs column capacitance again subsequently in the display for each row.
Summary of the invention:
In view of the above, wishing now has a kind of display control method, and the state transition that it can make display matrix respectively list is minimum, thereby reduces power consumption, has increased the time total amount that display is operated by a powered battery.
Description of drawings:
Fig. 1 example goes out the profile according to display of the present invention;
Fig. 2 illustrates the timing diagram according to the timing relationship of the display of Fig. 1 of the present invention;
Fig. 3 roughly illustrates a circuit that can form according to the timing diagram shown in Fig. 2 of the present invention.
Specific embodiment:
Fig. 1 roughly shows the bright profile that utilizes the field emission device display 10 of matrix addressing.Comprise substrate 11 in the display 10, the other parts of display 10 all are formed in this substrate 11.Generally, substrate 11 is a kind of insulating material or semi insulating material, for example is the silicon materials that have dielectric layer or glass.In a preferred embodiment, substrate 11 is a glass.Usually, cathode conductor or row 12 at the table of substrate 11 and on form, utilize it that emission tip or emitter 13 and 17 are connected in the row of display 10.Row 12 employed materials can be a kind of metals or such as the conductive formation of doped polycrystalline silicon.First extract grid or promptly first row 27 and second extract grid or promptly second row 19 rely on dielectric layers 16 and on electric, keep apart with substrate 11 and row 12.Utilize emitter 13 and 17 to come emitting electrons, ejected electron is collected by being arranged on from emitter 13 and 17 anode 18 at a distance.Generally vacuumize in the space between anode 18 and row 19 and 27, to allow electron transit.Surface towards the anode 18 of emitter 13 and 17 generally is coated with phosphorus, so that produce image or demonstration during electron bombard anode 18.
First voltage source 23 is connected on first row 27, and second voltage source 24 is connected on the row 12, thereby produces a voltage difference between emitter 13 and row 27, emits from emitter 13 with excited electrons.Similarly, tertiary voltage source 26 is connected on second row 19 and emits from emitter 17 with excited electrons.Each of display 10 is shown a large amount of emitters, such as emitter 13 and 17.In addition, display 10 can have row a large amount of such as row 12, and a large amount of row in row 19 and 27 and so on.
Fig. 2 illustrates the timing diagram that how to utilize voltage source 23,24 and 26 to control display 10 (Fig. 1).The sequencing of the row and column of display 10 row and regularly will select to such an extent that can reduce the frequency of operation of row 12 (Fig. 1), and compare with the method for control display in the prior art and can make the power consumption of display 10 reduce half.This low power consumption is by means of control voltage source 24 (Fig. 1) least number of times of state transition to be realized, reduces the frequency of operation of voltage source 24 and row 12 thus.Each label that comprises in the diagrammatic sketch of Fig. 2 can be with reference to the label of the parts in the display shown in the figure 1 10.Though, only showing row and two row, this kind technology also may be used in the display of many row and many row.
First timing Figure 31 (V
1) show the output of voltage source 23 shown in bright Fig. 1.Second timing Figure 33 (V
3) show the output in prescribed voltage source 26, and the 3rd Figure 32 (V regularly
2) show the output of bright second voltage source 24.The 4th timing Figure 41 (V also is shown among Fig. 2
4), this will be described hereinafter.HBLANK regularly Figure 30 shows a bright horizontal blanking signal.When waveform Figure 30 worked (high level), display 10 was under an embargo (disable), allows the data saltus step.And when waveform Figure 30 inoperative (low level), the other one by one line of display 10 or row show that just a period of time is called a level demonstration time or is called a demonstration time like this.In inoperative each the time interscan delegation subsequently that continues of waveform Figure 30, so that in the image of display 10, provide another line.Waveform Figure 30 is illustrated and is used for reference, and the work that is not display 10 (Fig. 1) is so essential.Those skilled in the art knows this type of horizontal blanking signal.When waveform Figure 30 was inoperative, other row such as row 19 or 27, worked in each demonstration time in the display 10 (Fig. 1).The first demonstration times 38 (t
1To t
3) representative voltage source 23 (V
1) time of working, the second demonstration times 39 (t
4To t
6) representative voltage source 26 (V
3) time of working.The time that on behalf of display 10 capable (not shown in figure 1) subsequently, the demonstration time 48 work is for bright shown in waveform Figure 41.
When each respective columns works or just in action before, information that show or data are applied in the display 10 (Fig. 1) on each other row.Determine whether emitting electrons of emitter on the point of crossing of row and column in action or emitter group by data.If these data will produce the light of demonstration, then being applied to the voltage that lists is enough to make and launches electronics on the particular transmission utmost point in specific pixel or the emitter group.Do not need to show if there is light, then be applied to this voltage that lists and make that emitter is not energized the electronics emission on the point of crossing of row that work and the row that works, thereby do not have light and generate.Motivate electronics emission, voltage source 24 (V during demonstration time 38 or demonstration time 39 for making
2) must have than voltage source 23 (V
1) or voltage source 26 (V
3) lower current potential, this is the state of voltage source 24 when working.Therefore, when waveform Figure 32 low level, can work.Voltage source 24 (V
2) work or inoperative state is decided by to want data presented respectively on the position of emitter 13 or emitter 17.For example, if data will show (promptly being that the electronics emission will take place), then voltage source 24 (V on the position of emitter 13
2) electronegative potential should be arranged during the demonstration time 38; If data will show on the position of emitter 17, voltage source 24 (V then
2) electronegative potential should be arranged during the demonstration time 39.The time span that voltage source 24 is in electronegative potential or promptly works has determined the brightness of shown image during demonstration time 38 or 39.Work in whole effective time of 27 if voltage source 24 (row 12) is expert at, then image has maximum brightness.For the image than low-light level, row 12 are to work in than the time of trip 27 for weak point.This generally is called width modulation.
In order to reduce the power consumption that each lists the number of times of saltus step and reduces display 10, make in a demonstration time that data being added to a moment that lists to motivate light (promptly being emitting electrons) changes along with in the previous demonstration time data being added to this moment that lists.If when the current demonstration time finishes, work before this broomrape, then be applied with data so that these row are energized in the elementary period of demonstration time at the next one; And if inoperative before this broomrape when current demonstration time finishes, then when the next one demonstration time finishes, be applied with data these row energized.Therefore, if one is listed in demonstration time and is in a kind of state (work or inoperative) when finishing, and on the next one initial point of demonstration time, will be in same state, then it can remain in this state between this two demonstration times, therefore, reduced the number of times of the state transition of making by these row.If show different states for one when the terminal point of a demonstration time and the initial point of next demonstration time, then this is listed in and understands once state transition between two demonstration times.Therefore, compare with prior art, on the frequency of operation of state transition number of times or row, actual percentage reduces and depends on and want data presented, but usually is reduced to about 50%.The timing layout that following table 1 example is fallen out.
The state when prostatitis row state in the next demonstration time at the current demonstration end time of the layout place of actual row state in the next demonstration time of table 1: position: the inoperative terminal point initial point that works
Wherein, terminal point=return back to the onset time that same demonstration time initial point is measured from showing end time; Initial point=show the certainly onset time of measuring on the time initial point.
As shown in Figure 2, at time t
0Last waveform Figure 30 (HBLANK) works, so display 10 (Fig. 1) is under an embargo (not energizing).At time t
1Last waveform Figure 30 becomes inoperative and identifies a demonstration time, and the delegation of display 10 is energized during this period, impels the formation image on display 10.At time t
1On, waveform Figure 31 (row 27 among Fig. 1) becomes and works, and this makes goes up the formation image at anode 18 (Fig. 1).If there is light to show at this moment, then voltage source 24 (Fig. 1) will be low at the voltage of certain part internal ratio voltage source 23 of demonstration time 38.At time t
3On, waveform Figure 31 (row 27 among Fig. 1) becomes inoperative, and horizontal blanking time 37 (being indicated by arrow) is being followed in its back, and the time t in the demonstration time 39
4Last waveform Figure 33 (row 19) then becomes and works.Time t in another horizontal blanking time 43 (indicating) generation by arrow
6Before the arrival, waveform Figure 33 keeps working always.
Row 12 (Fig. 1) become moment of working by waveform Figure 32 (V in the demonstration time 38
2) show brightly, it is decided by above described and referring to the table 1 of front.Owing to before do not show the time, during the terminal point of demonstration time 38 so waveform Figure 32 (row 12) works.Just, the measurement of the timing of waveform Figure 32 is that the terminal point from the demonstration time 38 return back on the initial point of demonstration time 38, and is as shown in arrow 34.This just allows that waveform Figure 32 works during the terminal point of current demonstration time, and in the demonstration time 39 that keeps working subsequently as shown in arrow 36, thus, eliminate the state transition of voltage source 24 and row 12 (Fig. 1), thereby reduced the corresponding work frequency.In such cases, specified as the waveform Figure 32 part between demonstration time 38 and 39, waveform Figure 32 and voltage source 24 keeps working on the horizontal blanking time of intermediary, and enters in subsequently demonstration time.
Regularly Figure 41 shows bright other delegation (not shown in figure 1), and it is by voltage source 26 (V
3) voltage source V that sequentially works afterwards
4(not shown in figure 1) drives.Waveform Figure 41 (voltage source V during the 3rd demonstration time 48
4) become and work.Because the state of waveform Figure 32 is inoperative when time t8, work so become at destination county waveform Figure 32 of demonstration time 48, as shown in arrow 44.Waveform Figure 32 also keeps inoperative in horizontal blanking time bright, intermediary shown in the arrow 43, so reduced the state transition number of times of voltage source 24 and row 12 (Fig. 1), thus, has reduced relevant frequency of operation and power consumption in the display 10 (Fig. 1).
Fig. 3 example goes out an embodiment of control circuit 50, and it compares the pixel of current demonstration with the next pixel that will show, produce an enabling signal 59, and it is controlled according to waveform Figure 32 among the Fig. 2 that indicates in the preamble and table 1 pair of voltage source 24.Two N-bit register are arranged in the circuit 50, and wherein, the bit number in the data presented word is wanted in the N representative, also equals to retain therein the bit number in the register of wanting data presented word or pixel words.Including in the current pixel register 51 will be by the display 10 of Fig. 1 in the pixel words of current demonstration, and includes the next pixel words that will be shown by display 10 in the next pixel register 52.Down counter 57 is sent in the output of register 51, down counter 57 and line output with Men Zhongxiang with, be a row start trigger 58, produce a clock signal.Trigger 58 is output as signal 59.Selecting circuit 53 that selection output or selection signal 61 are arranged, utilize it to select such position in the demonstration time, promptly is such shown in arrow 34 and 36 in demonstration time 38 among Fig. 2 and 39, the time location that voltage source 24 (Fig. 1) is started.
A current pixel that is showing is in register 51, and the next pixel that will show is loaded in the register 52.Select circuit 53 that inclusive-OR operation is carried out in all output of register 52, produce next signal 62, circuit 53 carries out inclusive-OR operation to all output of register 51 again, produces a current demand signal 63.If current pixel and next pixel both have the pixel that will show, then signal 62 and 63 both will work and indicate, the timing of next pixel should originate in the initial point of demonstration time, and is specified as arrow among Fig. 2 36.This state storage is in first trigger 66, and trigger 66 is output as signal 61.This state of signal 61 retains always, when showing next pixel till.Select signal 61 to be used for starting multiplexer 54, to select the content that to use as in the register 52 of next pixel words, being input in the register 51, making in the next picture point time current content of register 52 become the content of storage 51, thereby the content of next pixel register 52 becomes the content of current pixel register 51 finally in next picture point time.If want data presented in the register 51, want data presented and there is no in the register 52, then signal 62 and 63 will have opposite state, select signal 61 multiplexer 54 of will energizing to be used as the next pixel words that to use, be made for the input of register 51 with the output of selecting subtracter 56.Subtracter 56 deducts the value of the next pixel words that comprises in the register 52 from showing time width, thereby the value of the next pixel that will show becomes the content that the demonstration time deducts register 52.This numerical value make the last part of the demonstration time that in Fig. 2 arrow 34 is specified in the time signal 59 just reinstated.
Circuit 50 is according to the waveform Figure 32 among Fig. 2, in order to control a control circuit embodiment of current voltage source 24 (Fig. 1).Also can additionally realize, promptly can adopt with how different control circuit embodiment and the methods of meter and produce control signal, and the present invention be not limited to the specific embodiment that example goes out.
Now, be to be understood that, here provided a kind of display control method of novelty, use current and state video data subsequently and orient timing in the demonstration time, can accomplish that carrying out subsequently keeping a signal to be in the demonstration time from a demonstration time is reinstated state.This control method has reduced the number of times of state transition on the column signal, thereby has reduced the frequency of operation of column signal, can reduce the capacitive power losses of display thus.
Claims (3)
1. a method of controlling field-emitter display is characterized in that, includes:
A kind of field-emitter display is provided, wherein contains first row (27), second row (19) and row (12), described first row (27) covers on first emitter (13), and described second row (19) covers on second emitter (17);
In very first time section (38), one first voltage is added on described first row (27);
Near the terminal of described very first time section (38) one second voltage is being added on the described row (12), during described very first time section (38), to motivate the electronics emission from described first emitter (13);
When described row (12) go up to keep described second voltage, a tertiary voltage is added in the time of keeping one second time period (39) on described second row (19), to motivate the electronics emission from described second emitter (37) near the top of described second time period (39), wherein said second time period (39) occurs in after the terminal of described very first time section (38).
2. the described method of claim 1, it is characterized in that, the step that applies described first voltage, applies described second voltage and apply described tertiary voltage comprises: apply described first and tertiary voltage all be lower than described second voltage so that the electronics emission can take place.
3. the described method of claim 1, it is characterized in that, described first voltage is added in that described first row is kept the time of very first time section (38) on (27) and second voltage is added to keep the step of the time of second time period (39) on described second row (19) and comprise: remove described first voltage in the terminal of described very first time section (38), remove described second voltage in the terminal of described second time period (39), the wherein said voltage of removing relies on and to make described first voltage and tertiary voltage be substantially equal to described second voltage to realize.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP415971 | 1995-04-03 | ||
| JP41597195 | 1995-04-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1136196A CN1136196A (en) | 1996-11-20 |
| CN1099095C true CN1099095C (en) | 2003-01-15 |
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ID=18524230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96104503A Expired - Fee Related CN1099095C (en) | 1995-04-03 | 1996-04-01 | Display control method |
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| Country | Link |
|---|---|
| CN (1) | CN1099095C (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5200846A (en) * | 1991-02-16 | 1993-04-06 | Semiconductor Energy Laboratory Co., Ltd. | Electro-optical device having a ratio controlling means for providing gradated display levels |
| US5311206A (en) * | 1993-04-16 | 1994-05-10 | Bell Communications Research, Inc. | Active row backlight, column shutter LCD with one shutter transition per row |
-
1996
- 1996-04-01 CN CN96104503A patent/CN1099095C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5200846A (en) * | 1991-02-16 | 1993-04-06 | Semiconductor Energy Laboratory Co., Ltd. | Electro-optical device having a ratio controlling means for providing gradated display levels |
| US5311206A (en) * | 1993-04-16 | 1994-05-10 | Bell Communications Research, Inc. | Active row backlight, column shutter LCD with one shutter transition per row |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1136196A (en) | 1996-11-20 |
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