CN103093724A - Novel active matrix/organic light emitting diode (AMOLED) pixel driving circuit - Google Patents
Novel active matrix/organic light emitting diode (AMOLED) pixel driving circuit Download PDFInfo
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Abstract
The invention discloses a novel active matrix/organic light emitting diode (AMOLED) pixel driving circuit. The structure of the circuit is beneficial for being tested by a digital testing module composed of an analog-to-digital converter (ADC), a digital-to-analog converter (DAC), a controller and other modules, and carries out compensation for threshold voltage excursion caused by the aging of a driving tube. The novel AMOLED pixel driving circuit has three advantages of carrying out automatic compensation for the threshold voltage excursion caused by the aging of the driving tube, being capable of testing the threshold voltage compensation effect of the driving tube after the manufacturing of the driving tube is completed, and being capable of extracting the threshold voltage in real time matched with external equipment and providing a basis for carrying threshold compensation with various methods.
Description
Technical field
The present invention relates to the pixel-driving circuit for Organic Light Emitting Diode, by testing digital module, DATA voltage is modified the aging driving tube threshold voltage shift that causes of compensation pixel driving circuit, this circuit also has the function of quick test driving tube threshold voltage compensation effect.
Background technology
Recent years are along with numerical digit consulting and multimedia application constantly increase, and the adding fuel to the flames of each large display manufacturer of the world, and make flat-panel screens go deep into rapidly each family and individual, and the mankind expect for high-quality video display very much.And organic electric exciting light-emitting diode display (OLED) is lightweight due to it, volume is thin, reaction velocity is fast, brightness is high, power saving, contrast is high, the visual angle is wide, low cost and other advantages receives much concern.
Due to the various advantages of OLED, the research of its driving circuit just becomes focus.Because deviation and the driving tube of manufacturing process are aging, in different pixels point driving circuit, the threshold voltage of driving tube is not exclusively equal, and then can cause panel luminance inhomogeneous.So the primary study problem of pixel-driving circuit is exactly to solve due to process deviation and the aging threshold voltage inconsistence problems that causes of driving tube.
In sum, traditional active pixel driving circuit is made of 2 NMOS pipes and 1 electric capacity as shown in Figure 1.Wherein, driving tube works in the saturation region in glow phase, and the current formula of saturation region is shown below.
Wherein,
Be the mobility of charge carrier,
Be the unit-area capacitance of grid oxygen in metal-oxide-semiconductor,
LBe the channel length of metal-oxide-semiconductor,
WBe the grid width of metal-oxide-semiconductor, these parameters are determined by selected metal-oxide-semiconductor technique.
V GS Be the voltage of metal-oxide-semiconductor grid end and source,
V TH It is the threshold voltage of metal-oxide-semiconductor.
As shown in following formula, the size of electric current is by gate source voltage and the threshold voltage of metal-oxide-semiconductor
V TH Difference determines.
Due to process deviation and the reason such as duty is inconsistent, in the different pixels driving circuit, the driving tube threshold voltage can be different, and this will cause panel luminance inhomogeneous, reduce the display performance of OLED.For addressing this problem, be necessary to optimize the structure of pixel-driving circuit, the deviation effect of driving tube threshold voltage is compensated.
Summary of the invention
The object of the invention is to address the above problem, proposed a kind of new pixel-driving circuit.This circuit has three advantages: 1) threshold voltage shift that causes because driving tube is aging is had the auto-compensation effect; 2) after the driving circuit manufacturing is completed, threshold voltage compensation effect that can the quick test driving tube; 3) coordinate external unit, can the extract real-time threshold voltage, then provide foundation for adopting various means to carry out valve value compensation.
The pixel-driving circuit of proposition of the present invention is characterized in that: it has four input ports, is respectively sweep signal SCAN, transducing signal SENSE, LED control signal EM and driving tube underlayer voltage signal SUB; It is brightness data signal DATA that an input/output port is arranged; Pixel-driving circuit is by four PMOS transistor Ts 1, T2, T3 and T4, and capacitor C, an Organic Light Emitting Diode OLED form; The source electrode of T1 pipe is connected with the brightness data signal, and grid is connected with sweep signal, and drain electrode is connected with the grid of T2, the source electrode of T3 and the port 2 of capacitor C; T2 is the driving tube of pixel-driving circuit, and the source electrode of T2 is connected with power vd D with the port one of capacitor C, and the drain electrode of T2 is connected with the source electrode of the drain electrode of T3 and T4, and the substrate of T2 is connected with driving tube underlayer voltage signal; The grid of T3 is connected with the SENSE signal; The grid of T4 is connected with LED control signal, and the drain electrode of T4 connects the OLED positive pole, the OLED minus earth.
Pixel-matrix circuit based on this pixel-driving circuit forms is characterized in that: sweep signal SCAN signal is in the pixel-driving circuit in delegation and shares; Sweep signal SENSE signal is in the pixel-driving circuit in delegation and shares; Brightness data signal DATA voltage signal is in the same pixel-driving circuit that lists and shares; Driving tube underlayer voltage signal SUB is in the same pixel-driving circuit that lists and shares; LED control signal EM shares for each pixel-driving circuit.
Advantage of the present invention and remarkable result:
1) this pixel-driving circuit is to utilize testing digital module actual measurement driving tube threshold voltage, then DATA is modified the driving tube threshold voltage shift of compensation pixel driving circuit, can compensate more accurately the aging and threshold voltage shift that causes of driving tube.
2) this pixel-driving circuit also has the function of quick test driving tube threshold voltage compensation effect, can detect this pixel-driving circuit and whether have the threshold voltage compensation effect.
Description of drawings
Fig. 1 is traditional active pixel driving circuit;
Fig. 2 is the pixel-driving circuit in the present invention;
Fig. 3 is the schematic diagram that testing digital module is connected with one of them pixel-driving circuit;
Fig. 4 is the work schedule of each control signal of the present invention;
Fig. 5 is the pixel-matrix circuit diagram;
Embodiment
As shown in Figure 2 be pixel-driving circuit of the present invention.It has four input ports, is respectively sweep signal SCAN, transducing signal SENSE, LED control signal EM and driving tube underlayer voltage signal SUB; It is brightness data signal DATA that an input/output port is arranged; Pixel-driving circuit is by four PMOS transistor Ts 1, T2, T3 and T4, and capacitor C, an Organic Light Emitting Diode OLED form; The source electrode of T1 pipe is connected with the brightness data signal, and grid is connected with sweep signal, and drain electrode is connected with the grid of T2, the source electrode of T3 and the port 2 of capacitor C; T2 is the driving tube of pixel-driving circuit, and the source electrode of T2 is connected with power vd D with the port one of capacitor C, and the drain electrode of T2 is connected with the source electrode of the drain electrode of T3 and T4, and the substrate of T2 is connected with driving tube underlayer voltage signal; The grid of T3 is connected with the SENSE signal; The grid of T4 is connected with LED control signal, and the drain electrode of T4 connects the OLED positive pole, the OLED minus earth.
The schematic diagram that testing digital module is connected with one of them pixel-driving circuit as shown in Figure 3.Test module is comprised of a controller, an analog to digital converter, two digital to analog converters, a brightness detector, three door switch PMOS pipe M1, M2, M3 and three current source S1, S2, S3, and the current source current size is respectively
,
With
, m, n be two mutual unequal greater than 1 constant,
It is the electric current of energy driving OLED maximum luminousing brightness.controller has two input ports, two output ports, two output ports are followed respectively two digital to analog converter input ports, what two digital to analog converters were exported respectively is DATA voltage signal and the driving tube underlayer voltage control signal that is input to the modification of pixel-driving circuit, two input ports of controller are followed respectively the output port of analog to digital converter and the output port of brightness detector, what analog to digital converter was inputted is three feedback voltage signals that obtained by pixel-driving circuit, what brightness detector was inputted is by the luminous luminance signal that obtains of pixel-driving circuit OLED, three door switch PMOS pipe M1, the grid of M2 and M3 is followed control signal SW1, SW2 and SW3, three current source S1 are followed respectively in drain electrode, S2 and S3, source electrode is all followed the source electrode of T1 in pixel-driving circuit.
When the aging pixel driver function that compensates of circuit Execution driven pipe, be divided into as shown in Figure 4 and be three phases:
1) the calculated threshold voltage stage:
SCAN signal in this stage pixel-driving circuit makes the T1 conducting to low level, and the SENSE signal makes the T3 conducting to low level, and EM makes the T4 cut-off to high level.
T1 is operated in linear zone, and the equivalent resistance that can obtain T1 is:
T2 is in state of saturation, and the drain current of T2 is:
In testing digital module, SW1 is to low level, and SW2, SW3 make the M1 conducting to high level, M2 and M3 cut-off.Electric current by T2 is
, through the grid voltage that calculates T2 be:
（3）
Because the equivalent resistance of metal-oxide-semiconductor is far longer than data line resistance, so data line resistance can be ignored.So first feedback voltage of analog to digital converter input is:
（4）
Then, get SW1, SW3 to high level, SW2 makes the M2 conducting to low level, and M1 and M3 cut-off is same, and we can be in the hope of the grid voltage of T2:
So second feedback voltage of analog to digital converter input is:
(6)
In like manner, get SW1, SW2 to high level, SW3 makes the M3 conducting to low level, M1 and M2 cut-off, and the 3rd feedback voltage that can obtain the analog to digital converter input is
Be input in the testing digital module middle controller after the feedback voltage signal that three feedback voltages carry out obtaining quantizing after analog to digital conversion through analog to digital converter and calculate, by (4), (6), (7)
Wherein, VDD is given,
,
,
Detectable exact value, m, n be two unequal greater than 1 constant.So calculate
Accurately.
2) compensated stage:
In this stage, SCAN signal in pixel-driving circuit makes the T1 conducting to low level, the SENSE signal makes the T3 cut-off to high level, EM makes the T4 cut-off to high level, the controller of testing digital module is revised the DATA voltage signal according to the threshold voltage that first stage obtains, and makes this magnitude of voltage
This voltage signal is stored in electric capacity through switch transistor T 1 after carrying out digital-to-analog conversion through digital to analog converter.
3) glow phase
This stage SCAN signal makes the T1 cut-off to high level, and the SENSE signal makes the T3 cut-off to high level, and EM makes the T4 conducting to low level, at this moment T2 grid terminal voltage:
So have
I like this
OLEDJust be similar to and be expressed as:
（12）
The threshold voltage of the final like this electric current that flows through OLED and metal-oxide-semiconductor is irrelevant, only relevant with Vdata, has realized the compensation to threshold shift.
When circuit is carried out the function of quick test driving tube threshold voltage compensation effect, minute two stages:
First stage:
The SCAN signal of pixel-driving circuit makes the T1 conducting to low level, and the SENSE signal makes the T3 conducting to low level, and EM makes the T4 cut-off to high level.
The driving tube underlayer voltage control signal of the controller output of testing digital module is through after the digital-to-analog conversion of digital to analog converter, be added on the substrate of T2 of pixel-driving circuit, and revise equably the underlayer voltage that is added in driving tube, underlayer voltage of every modification, all utilize the method for the first stage when carrying out the pixel driver function, calculate threshold voltage corresponding to each underlayer voltage of driving tube T2, finally obtain the threshold voltage of driving tube and the graph of a relation of its underlayer voltage.
Second stage:
the controller of testing digital module obtains the threshold voltage of driving tube of pixel-driving circuit according to first stage and the graph of a relation of its underlayer voltage is revised driving tube underlayer voltage control signal, then through after the digital to analog converter conversion, control the driving tube underlayer voltage of pixel-driving circuit by it, make the threshold voltage of driving tube evenly increase, after underlayer voltage of every change, all allow circuit carry out a pixel driver function, brightness detector by testing digital module detects OLED brightness again, and be entered in controller, obtain the relation curve of the brightness of the driving tube threshold voltage of pixel-driving circuit and OLED, whether has driving tube threshold voltage compensation effect according to this curve decision circuitry.
As shown in Figure 5 be based on the pixel-matrix circuit that this pixel-driving circuit forms.Sweep signal SCAN signal is in the pixel-driving circuit in delegation and shares; Sweep signal SENSE signal is in the pixel-driving circuit in delegation and shares; Brightness data signal DATA voltage signal is in the same pixel-driving circuit that lists and shares; Driving tube underlayer voltage signal SUB is in the same pixel-driving circuit that lists and shares; LED control signal EM shares for each pixel-driving circuit.
The course of work of pixel-matrix circuit:
At first, the EM signal is to high level, sweep signal SCAN1 signal in the first row pixel-driving circuit is to low level, transducing signal SENSE1 signal is to low level, the sweep signal of the pixel-driving circuit of other row and transducing signal are all given high level, make the pixel-driving circuit of the first row work in the calculated threshold voltage stage, at this moment, the digital test circuit of each row is connected with each pixel-driving circuit of the first row respectively, calculates respectively the threshold voltage of each pixel-driving circuit of the first row.Then, other signals are constant, and the SENSE1 signal makes the pixel-driving circuit of the first row work in compensated stage to high level, and at this moment, the electric capacity that the brightness data signal DATA of the first row pixel-driving circuit is stored in each pixel-driving circuit has suffered.
With the first behavior example, respectively the pixel-driving circuit of other row carried out same job step.After completing, the electric capacity that the brightness data signal DATA of all pixel-driving circuits is stored in each pixel-driving circuit has suffered.
At last, the EM signal is to high level, and the sweep signal of all pixel-driving circuits and transducing signal are all given high level, makes each pixel-driving circuit of whole pixel-matrix circuit enter glow phase.
Claims (2)
1. the present invention discloses a kind of novel AMOLED pixel-driving circuit, it is characterized in that: it has four input ports, is respectively sweep signal SCAN, transducing signal SENSE, LED control signal EM and driving tube underlayer voltage signal SUB; It is brightness data signal DATA that an input/output port is arranged; Pixel-driving circuit is by four PMOS transistor Ts 1, T2, T3 and T4, and capacitor C, an Organic Light Emitting Diode OLED form; The source electrode of T1 pipe is connected with the brightness data signal, and grid is connected with sweep signal, and drain electrode is connected with the grid of T2, the source electrode of T3 and the port 2 of capacitor C; T2 is the driving tube of pixel-driving circuit, and the source electrode of T2 is connected with power vd D with the port one of capacitor C, and the drain electrode of T2 is connected with the source electrode of the drain electrode of T3 and T4, and the substrate of T2 is connected with driving tube underlayer voltage signal; The grid of T3 is connected with the SENSE signal; The grid of T4 is connected with LED control signal, and the drain electrode of T4 connects the OLED positive pole, the OLED minus earth.
2. the pixel-matrix circuit that forms based on this pixel-driving circuit is characterized in that: sweep signal SCAN signal is in the pixel-driving circuit in delegation and shares; Sweep signal SENSE signal is in the pixel-driving circuit in delegation and shares; Brightness data signal DATA voltage signal is in the same pixel-driving circuit that lists and shares; Driving tube underlayer voltage signal SUB is in the same pixel-driving circuit that lists and shares; LED control signal EM shares for each pixel-driving circuit.
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| CN2013100677243A CN103093724A (en) | 2013-03-04 | 2013-03-04 | Novel active matrix/organic light emitting diode (AMOLED) pixel driving circuit |
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| CN104240639A (en) * | 2014-08-22 | 2014-12-24 | 京东方科技集团股份有限公司 | Pixel circuit, organic electroluminescence display panel and display device |
| CN105243994A (en) * | 2015-11-11 | 2016-01-13 | 深圳市华星光电技术有限公司 | AMOLED drive system and drive method |
| CN105513536A (en) * | 2016-02-02 | 2016-04-20 | 京东方科技集团股份有限公司 | Pixel driving chip and method and pixel structure |
| CN107025884A (en) * | 2017-05-04 | 2017-08-08 | 京东方科技集团股份有限公司 | OLED pixel compensation method, compensation device and display device |
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| CN109658837A (en) * | 2017-10-12 | 2019-04-19 | 群创光电股份有限公司 | Semiconductor device and the method for driving semiconductor device |
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| WO2019000616A1 (en) * | 2017-06-30 | 2019-01-03 | 深圳市华星光电技术有限公司 | Compensation method of pixel driving circuit used for oled display panel |
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| CN109658837A (en) * | 2017-10-12 | 2019-04-19 | 群创光电股份有限公司 | Semiconductor device and the method for driving semiconductor device |
| WO2019144669A1 (en) * | 2018-01-29 | 2019-08-01 | 京东方科技集团股份有限公司 | Detection method for pixel circuit, driving method for display panel, and display device |
| CN111341263A (en) * | 2020-04-26 | 2020-06-26 | 合肥视涯技术有限公司 | Pixel circuit, silicon-based display panel and display device |
| CN111402805A (en) * | 2020-04-26 | 2020-07-10 | 合肥视涯技术有限公司 | Pixel circuit, silicon-based display panel and display device |
| CN111341263B (en) * | 2020-04-26 | 2021-07-06 | 合肥视涯技术有限公司 | Pixel circuit, silicon-based display panel and display device |
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Application publication date: 20130508 |