CN103150991A - Pixel compensation circuit for AMOLED (Active Matrix/Organic Light Emitting Diode) displayer - Google Patents

Pixel compensation circuit for AMOLED (Active Matrix/Organic Light Emitting Diode) displayer Download PDF

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Publication number
CN103150991A
CN103150991A CN2013100806441A CN201310080644A CN103150991A CN 103150991 A CN103150991 A CN 103150991A CN 2013100806441 A CN2013100806441 A CN 2013100806441A CN 201310080644 A CN201310080644 A CN 201310080644A CN 103150991 A CN103150991 A CN 103150991A
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end
described
switch
3rd
voltage
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CN2013100806441A
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郑士嵩
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友达光电股份有限公司
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Abstract

The invention provides a pixel compensation circuit. The pixel compensation circuit comprises a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a first capacitor, a second capacitor and an organic light-emitting diode, wherein a first end of the first switch receives data voltage; a second end of the first switch receives a first switch signal; a second end of the second switch receives the first switch signal; a second end and a third end of the third switch are both connected to first voltage; a first end of the fifth switch receives reference voltage; a second end of the fifth switch receives a third switch signal; a second end of the sixth switch receives the third switch signal; a first end of the second capacitor is connected to a second end of the first capacitor; a second end of the second capacitor receives a second switch signal; a first end of the organic light-emitting diode is connected to a first end of the sixth switch; and a second end of the organic light-emitting diode is connected to second voltage. Compared with the prior art, the pixel compensation circuit has the advantages that the threshold value voltage of the switches is compensated before a lightening period, so that the influence of the threshold vale voltage on OLED (Organic Light Emitting Diode) current is eliminated, and stable current output of an OLED in a pixel can be kept.

Description

A kind of pixel compensation circuit for the AMOLED display

Technical field

The present invention relates to a kind of active matrix organic LED display, relate in particular to the pixel compensation circuit of this AMOLED display.

Background technology

Organic Light Emitting Diode (Organic Light Emitting Diode, OLED) can be divided into passive matrix according to type of drive and drive (Passive Matrix OLED, PMOLED) and active-matrix drive (Active Matrix OLED, AMOLED) two kinds.Wherein, PMOLED does not write fashionable not luminous, only luminous in the data during writing when data.This type of drive is simple in structure, cost is lower, be easier to design, mainly is applicable to the display of small-medium size.

The difference of AMOLED and PMOLED maximum is to be, each pixel has capacitance stores data, allows each pixel all maintain luminance.Because AMOLED power consumption is significantly less than PMOLED, add that its type of drive is fit to the display of development large scale and high-res, makes AMOLED become the main direction of future development.But in the driving mechanism of AMOLED display, OLED is based on its size of current of flowing through and controls luminous brightness, will directly have influence on the display effect of picture as the electrical parameter of the thin film transistor (TFT) that drives.For example, impact due to processing procedure, drift may appear in the threshold voltage of the thin film transistor (TFT) in each pixel (threshold voltage), at this moment, even if provide identical data voltage to these pixels, the electric current of the OLED of each pixel of flowing through still can be variant, causes the AMOLED display brightness irregularities to occur.

In view of this, how designing a kind of pixel compensation circuit for the AMOLED display, effectively to improve or to eliminate many defectives such as brightness irregularities, display frame be second-rate, is a problem needing to be resolved hurrily of person skilled in the industry.

Summary of the invention

For the existing defects of pixel compensation circuit for the AMOLED display of the prior art, the invention provides pixel compensation circuit a kind of novelty, that can improve brightness disproportionation.

According to one aspect of the present invention, a kind of pixel compensation circuit for the AMOLED display is provided, comprising:

One first switch has a first end, one second end and one the 3rd end, and its first end is in order to receive a data voltage, and its second end is in order to receive one first switching signal;

One second switch has a first end, one second end and one the 3rd end, and its second end is in order to receive described the first switching signal;

One the 3rd switch has a first end, one second end and one the 3rd end, and its second end and the 3rd end all are electrically connected to one first voltage;

One the 4th switch, have a first end, one second end and one the 3rd end, its first end is electrically connected to the second end of described the 3rd switch, and its second end is electrically connected to the first end of described the 3rd switch, and its 3rd end is electrically connected to the 3rd end of described second switch;

One the 5th switch has a first end, one second end and one the 3rd end, and its first end is in order to receive a reference voltage, and its second end is in order to receive one the 3rd switching signal, and its 3rd end is electrically connected to the 3rd end of described the first switch;

One the 6th switch has a first end, one second end and one the 3rd end, and its second end is in order to receive described the 3rd switching signal, and its 3rd end is electrically connected to the 3rd end of described second switch;

One first electric capacity has a first end and one second end, and its first end is electrically connected to the 3rd end of described the first switch, and its second end is electrically connected to the first end of described the 3rd switch;

One second electric capacity has a first end and one second end, and its first end is electrically connected to the second end of described the first electric capacity and the first end of described second switch, and its second end is in order to receive a second switch signal; And

One Organic Light Emitting Diode has a first end and one second end, and its first end is electrically connected to the first end of described the 6th switch, and its second end is electrically connected to a second voltage, and wherein, described second voltage is less than described the first voltage.

Preferably, the first switch to the six switches are a thin film transistor (TFT).

Preferably, during the combination of the first switching signal, second switch signal and the 3rd switching signal keeps corresponding to data successively, during a reseting period, a voltage compensation and one light during.

In an embodiment therein, during data keep in, described the first switching signal and described second switch signal are low level, described the 3rd switching signal is high level.

An embodiment therein, in reseting period, the first switching signal is low level, and the second switch signal is high level from low transition, and the 3rd switching signal is high level.

In an embodiment therein, during described voltage compensation, the first switching signal is low level, and the second switch signal is low level from the high level saltus step, and the 3rd switching signal is high level.

In an embodiment therein, during lighting, described the first switching signal is high level, and described second switch signal is low level, and described the 3rd switching signal is low level.

Preferably, at described reseting period, the voltage Vg of the second end of described the 4th switch satisfies relational expression: Vg=OVDD+ ︱ V th

Preferably, during described voltage compensation, the voltage Vg of the second end of described the 4th switch satisfies relational expression: Vg=OVDD-︱ V th

Preferably, during described lighting, the voltage Vg of the second end of described the 4th switch satisfies relational expression: Vg=OVDD-︱ V th︱+V ref-V Data

Wherein, OVDD represents described the first voltage, V thThe threshold voltage threshold value that represents described thin film transistor (TFT), V refRepresent described reference voltage, V DataRepresent described data voltage.

adopt pixel compensation circuit of the present invention, 6T2C framework by six switches and two electric capacity formations carries out current drives to OLED, the first end of the first switch receives a data voltage, the first switch and second switch the second end separately receives one first switching signal simultaneously, the second end of the 3rd switch and the second end are connected to one first voltage, the 5th switch and the 6th switch the second end separately receives one the 3rd switching signal simultaneously, the second end that the first end of the first electric capacity is connected to the 3rd end of the first switch and the first electric capacity is connected to the first end of the 3rd switch, the first end of the second electric capacity is connected to the second end of the first electric capacity and the first end of second switch and the second termination of the second electric capacity and receives a second switch signal.Than prior art, the present invention compensated operation before the threshold value voltage of thin film transistor (TFT) is during lighting, eliminated the dependence of OLED electric current for this threshold value voltage, thereby made the OLED in pixel can keep stable electric current output.

Description of drawings

The reader will become apparent various aspects of the present invention after the reference accompanying drawing has been read the specific embodiment of the present invention.Wherein,

Fig. 1 illustrates the principle schematic that adopts the 6T1C framework for the pixel compensation circuit of AMOLED display of the prior art;

Fig. 2 illustrates according to one embodiment of the present invention, and the pixel compensation circuit that is used for the AMOLED display adopts the principle schematic of 6T2C framework;

Fig. 3 a illustrates the working state schematic representation of each switch of pixel compensation circuit during data keep of Fig. 2;

Fig. 3 b illustrates the sequential schematic diagram of key signal of the pixel compensation circuit of Fig. 3 a;

Fig. 4 a illustrates the pixel compensation circuit of Fig. 2 at the working state schematic representation of each switch of reseting period;

Fig. 4 b illustrates the sequential schematic diagram of key signal of the pixel compensation circuit of Fig. 4 a;

Fig. 5 a illustrates the working state schematic representation of each switch of pixel compensation circuit during voltage compensation of Fig. 2;

Fig. 5 b illustrates the sequential schematic diagram of key signal of the pixel compensation circuit of Fig. 5 a;

Fig. 6 a illustrates the working state schematic representation of each switch of pixel compensation circuit during lighting of Fig. 2; And

Fig. 6 b illustrates the sequential schematic diagram of key signal of the pixel compensation circuit of Fig. 6 a.

Embodiment

For technology contents that the application is disclosed is more detailed and complete, can be with reference to accompanying drawing and following various specific embodiments of the present invention, in accompanying drawing, identical mark represents same or analogous assembly.Yet those of ordinary skill in the art should be appreciated that the embodiment that hereinafter provides limits the scope that the present invention is contained.In addition, accompanying drawing only is used for schematically being illustrated, and does not draw according to its life size.

With reference to the accompanying drawings, the embodiment of various aspects of the present invention is described in further detail.

Fig. 1 illustrates the principle schematic that the pixel compensation circuit for the AMOLED display of the prior art adopts the 6T1C framework, and Fig. 2 illustrates the sequential schematic diagram of key signal of the pixel compensation circuit of Fig. 1.

With reference to Fig. 1, this pixel compensation circuit is one " 6T1C " framework, and the 6T here is thin film transistor (TFT) M1~M6, and 1C is the set memory capacitance Cs of tie point of the grid of thin film transistor (TFT) M4 and thin film transistor (TFT) M1, M3.That is the number of term " mTnC " expression thin film transistor (TFT) is m, and the number of memory capacitance is n, and m, n are natural number.

The circuit framework of this 6T1C specifically describes as follows: the first end of memory capacitance Cs is electrically connected to one first switching signal S1.The first end of thin film transistor (TFT) M1 is electrically coupled to the second end of this memory capacitance Cs, and the second end of thin film transistor (TFT) M1 is electrically coupled to one first voltage VDD, and the 3rd end of thin film transistor (TFT) M1 and the second end electric property coupling are together.The second end of thin film transistor (TFT) M5 is in order to receive one the 3rd switching signal EM, and the 3rd end of thin film transistor (TFT) M5 is electrically coupled to this first voltage VDD.The first end of thin film transistor (TFT) M2 is electrically coupled to the first end of thin film transistor (TFT) M5, and the second end of thin film transistor (TFT) M2 is in order to receive a second switch signal S2, and the 3rd end of thin film transistor (TFT) M2 is electrically connected to a data voltage Vdata.

The first end of thin film transistor (TFT) M4 is electrically coupled to the first end of thin film transistor (TFT) M2 and the first end of thin film transistor (TFT) M5, and the second end of thin film transistor (TFT) M4 is electrically coupled to the first end of thin film transistor (TFT) M1 and the second end of memory capacitance Cs.The first end of thin film transistor (TFT) M3 is electrically coupled to the second end of thin film transistor (TFT) M4, and the second end of thin film transistor (TFT) M3 is in order to receive this second switch signal S2, and the 3rd end of thin film transistor (TFT) M3 is electrically coupled to the 3rd end of thin film transistor (TFT) M4.The first end of thin film transistor (TFT) M6 is electrically coupled to the 3rd end of thin film transistor (TFT) M3, and the second end of thin film transistor (TFT) M6 is in order to receive the 3rd switching signal EM.The anode of Organic Light Emitting Diode OLED is electrically coupled to the 3rd end of thin film transistor (TFT) M6, and its negative electrode is connected to second voltage VSS.

Yet the electrical parameter that is used as the thin film transistor (TFT) that drives will directly have influence on the display effect of picture.Impact due to processing procedure, drift often appears in the threshold voltage of the thin film transistor (TFT) in each pixel, at this moment, even if provide identical data voltage to these pixels, the electric current of the OLED of each pixel of flowing through still can be variant, causes the AMOLED display brightness irregularities to occur.

In order effectively to address the aforementioned drawbacks, the invention provides a kind of pixel compensation circuit framework of novelty.Fig. 2 illustrates according to one embodiment of the present invention, and the pixel compensation circuit that is used for the AMOLED display adopts the principle schematic of 6T2C framework.

With reference to Fig. 2, pixel compensation circuit of the present invention adopts the 6T2C framework, comprises the first switch T1, second switch T2, the 3rd switch T3, the 4th switch T4, the 5th switch T5, the 6th switch T6, the first capacitor C 1 and the second capacitor C 2.

The first switch T1 has a first end (as source electrode, hereinafter all same), one second end (as grid, hereinafter all same) and one the 3rd end (as drain electrode, hereinafter all same).The source electrode of the first switch T1 is in order to receive a data voltage Vdata, and grid is in order to receive one first switching signal S1.The grid of second switch T2 is in order to receive this first switching signal S1, and source electrode is electrically coupled to the first end of the second capacitor C 2 and the second end of the first capacitor C 1.The grid of the 3rd switch T3 and source electrode all are electrically connected to one first voltage OVDD.

The source electrode of the 4th switch T4 is electrically connected to the grid of the 3rd switch T3, and the grid of the 4th switch T4 is electrically connected to the drain electrode of the 3rd switch T3, and the drain electrode of the 4th switch T4 is electrically connected to the drain electrode of second switch T2.The source electrode of the 5th switch T5 is in order to receive a reference voltage Vref, and the grid of the 5th switch T5 is in order to receive one the 3rd switching signal EM, and the drain electrode of the 5th switch T5 is electrically connected to the drain electrode of the first switch T1.The grid of the 6th switch T6 is in order to receive the 3rd switching signal EM, and the source electrode of the 6th switch T6 is electrically connected to the drain electrode of second switch T2 and the drain electrode of the 4th switch T4.

And the first capacitor C 1 has a first end and one second end, and the first end of this first capacitor C 1 is electrically connected to the drain electrode of the first switch T1, and the second end of this first capacitor C 1 is electrically connected to the drain electrode of the 3rd switch T3.The second capacitor C 2 has a first end and one second end, and the first end of this second capacitor C 2 is electrically connected to the second end of the first capacitor C 1 and the source electrode of second switch T2, and the second end of this second capacitor C 2 is in order to receive this second switch signal S2.The anode of Organic Light Emitting Diode OLED is electrically connected to the drain electrode of the 6th switch T6, and its negative electrode is electrically connected to a second voltage OVSS, and this second voltage OVSS is less than the first voltage OVDD.

In one embodiment, the first switch T1 to the six switch T6 are a thin film transistor (TFT).

In one embodiment, the combination of the first switching signal S1, second switch signal S2 and the 3rd switching signal EM keeps period P 1, a reseting period P2, a voltage compensation period P 3 and to light period P 4 corresponding to data successively.That is to say, the running of pixel compensation circuit of the present invention can be divided into several cycle periods, and each cycle period at first executing data keeps operation, and then carries out reset operation, then the threshold value voltage of thin film transistor (TFT) compensated, light again at last Organic Light Emitting Diode.

The working state schematic representation of each switch of the pixel compensation circuit that Fig. 3 a illustrates Fig. 2 during data keep, Fig. 3 b illustrate the sequential schematic diagram of key signal of the pixel compensation circuit of Fig. 3 a.

With reference to Fig. 3 a and Fig. 3 b, within data kept period P 1, the first switching signal S1 and second switch signal S2 were low level, and the 3rd switching signal EM is high level.At this moment, the 5th switch T5 and the 6th switch T6 are in off state.And the first switch T1 is in open mode under the effect of the first switching signal S1, and the drain potential of the first switch T1 is data voltage Vdata, and the grid potential of the 4th switch T4 is a suspended state (floating).

Fig. 4 a illustrates the pixel compensation circuit of Fig. 2 at the working state schematic representation of each switch of reseting period, and Fig. 4 b is the sequential schematic diagram of key signal of the pixel compensation circuit of Fig. 4 a.

With reference to Fig. 4 a and Fig. 4 b, in reseting period P2, the first switching signal S1 is low level, and second switch signal S2 is high level from low transition, and the 3rd switching signal EM is high level.At this moment, the 5th switch T5 and the 6th switch T6 are in off state, and the 4th switch T3 also is in off state.And the first switch T1 is in open mode under the effect of the first switching signal S1, and the drain potential of the first switch T1 is data voltage Vdata, and the grid potential Vg of the 4th switch T4 can satisfy relational expression:

Vg=OVDD+︱V th

Wherein, OVDD represents the first voltage, V thThe threshold voltage threshold value of expression thin film transistor (TFT).

Fig. 5 a illustrates the working state schematic representation of each switch of pixel compensation circuit during voltage compensation of Fig. 2, and Fig. 5 b illustrates the sequential schematic diagram of key signal of the pixel compensation circuit of Fig. 5 a.

With reference to Fig. 5 a and Fig. 5 b, in voltage compensation period P 3, the first switching signal S1 is low level, and second switch signal S2 is low level from the high level saltus step, and the 3rd switching signal EM is high level.At this moment, the 5th switch T5 and the 6th switch T6 still are in off state, and the 3rd switch T3 also is in off state.The first switch T1 is in open mode under the effect of the first switching signal S1, the drain potential of the first switch T1 is data voltage Vdata.And the grid potential Vg of the 4th switch T4 can satisfy relational expression:

Vg=OVDD-︱V th

Wherein, OVDD represents the first voltage, V thThe threshold voltage threshold value of expression thin film transistor (TFT).

Fig. 6 a illustrates the working state schematic representation of each switch of pixel compensation circuit during lighting of Fig. 2, and Fig. 6 b is the sequential schematic diagram of key signal of the pixel compensation circuit of Fig. 6 a.

With reference to Fig. 6 a and Fig. 6 b, in lighting period P 4, the first switching signal S1 is high level, and second switch signal S2 is low level, and the 3rd switching signal EM is also low level.At this moment, the 5th switch T5 and the 6th switch T6 are in open mode under the effect of the 3rd switching signal EM, and the first switch T1 and second switch T2 are in off state under the effect of the first switching signal S1, and the 3rd switch T3 also is in off state.At this moment, the drain potential of the first switch T1 is reference voltage Vref.And the grid potential Vg of the 4th switch T4 satisfies relational expression:

Vg=OVDD-︱V th︱+V ref-V data

Wherein, OVDD represents the first voltage, V thThe threshold voltage threshold value of expression thin film transistor (TFT), V refThe expression reference voltage, V DataThe expression data voltage.

Again come Flow through the size of current of Organic Light Emitting Diode OLED according to aforesaid relationship:

I d = 1 2 · κ · ( V sg - | V th | ) 2

Because the grid potential Vg of the 4th switch T4 equals (OVDD-|V th|+V ref-Vdata), and the source potential Vs of the 4th switch T4 equals OVDD,

V sg=OVDD-(OVDD-|V th|+V ref-Vdata)

That is,

I d = 1 2 · κ · ( V sg - | V th | ) 2

= 1 2 · κ · [ OVDD - ( OVDD - | V th | + V ref - Vdata ) - | V th | ] 2

= 1 2 · κ · ( Vdata - V ref ) 2

Hence one can see that, and the electric current of the Organic Light Emitting Diode OLED that flows through is only relevant with data voltage Vdata and reference voltage Vref, with the threshold value independent from voltage of thin film transistor (TFT).

adopt pixel compensation circuit of the present invention, 6T2C framework by six switches and two electric capacity formations carries out current drives to OLED, the first end of the first switch receives a data voltage, the first switch and second switch the second end separately receives one first switching signal simultaneously, the second end of the 3rd switch and the second end are connected to one first voltage, the 5th switch and the 6th switch the second end separately receives one the 3rd switching signal simultaneously, the second end that the first end of the first electric capacity is connected to the 3rd end of the first switch and the first electric capacity is connected to the first end of the 3rd switch, the first end of the second electric capacity is connected to the second end of the first electric capacity and the first end of second switch and the second termination of the second electric capacity and receives a second switch signal.Than prior art, the present invention compensated operation before the threshold value voltage of thin film transistor (TFT) is during lighting, eliminated the dependence of OLED electric current for this threshold value voltage, thereby made the OLED in pixel can keep stable electric current output.

Above, describe the specific embodiment of the present invention with reference to the accompanying drawings.But those skilled in the art can understand, in the situation that without departing from the spirit and scope of the present invention, can also do various changes and replacement to the specific embodiment of the present invention.These changes and replacement all drop in claims limited range of the present invention.

Claims (10)

1. a pixel compensation circuit that is used for active matrix organic LED (AMOLED, Active Matrix Organic Light Emitting Diode) display, is characterized in that, described pixel compensation circuit comprises:
One first switch has a first end, one second end and one the 3rd end, and its first end is in order to receive a data voltage, and its second end is in order to receive one first switching signal;
One second switch has a first end, one second end and one the 3rd end, and its second end is in order to receive described the first switching signal;
One the 3rd switch has a first end, one second end and one the 3rd end, and its second end and the 3rd end all are electrically connected to one first voltage;
One the 4th switch, have a first end, one second end and one the 3rd end, its first end is electrically connected to the second end of described the 3rd switch, and its second end is electrically connected to the first end of described the 3rd switch, and its 3rd end is electrically connected to the 3rd end of described second switch;
One the 5th switch has a first end, one second end and one the 3rd end, and its first end is in order to receive a reference voltage, and its second end is in order to receive one the 3rd switching signal, and its 3rd end is electrically connected to the 3rd end of described the first switch;
One the 6th switch has a first end, one second end and one the 3rd end, and its second end is in order to receive described the 3rd switching signal, and its 3rd end is electrically connected to the 3rd end of described second switch;
One first electric capacity has a first end and one second end, and its first end is electrically connected to the 3rd end of described the first switch, and its second end is electrically connected to the first end of described the 3rd switch;
One second electric capacity has a first end and one second end, and its first end is electrically connected to the second end of described the first electric capacity and the first end of described second switch, and its second end is in order to receive a second switch signal; And
One Organic Light Emitting Diode (OLED, Organic Light Emitting Diode), have a first end and one second end, its first end is electrically connected to the first end of described the 6th switch, its second end is electrically connected to a second voltage, wherein, described second voltage is less than described the first voltage.
2. pixel compensation circuit according to claim 1, is characterized in that, described the first switch to described the 6th switch is a thin film transistor (TFT).
3. pixel-driving circuit according to claim 1, it is characterized in that, during the combination of described the first switching signal, described second switch signal and described the 3rd switching signal keeps corresponding to data successively, during a reseting period, a voltage compensation and one light during.
4. pixel compensation circuit according to claim 3, is characterized in that, during described data keep in, described the first switching signal and described second switch signal are low level, described the 3rd switching signal is high level.
5. pixel compensation circuit according to claim 4, is characterized in that, in described reseting period, described the first switching signal is low level, and described second switch signal is high level from low transition, and described the 3rd switching signal is high level.
6. pixel compensation circuit according to claim 5, is characterized in that, during described voltage compensation, described the first switching signal is low level, and described second switch signal is low level from the high level saltus step, and described the 3rd switching signal is high level.
7. pixel compensation circuit according to claim 6, is characterized in that, during described lighting, described the first switching signal is high level, and described second switch signal is low level, and described the 3rd switching signal is low level.
8. pixel compensation circuit according to claim 3, is characterized in that, at described reseting period, the voltage Vg of the second end of described the 4th switch satisfies relational expression:
Vg=OVDD+︱V th
Wherein, OVDD represents described the first voltage, V thThe threshold voltage threshold value that represents described thin film transistor (TFT).
9. pixel compensation circuit according to claim 3, is characterized in that, during described voltage compensation, the voltage Vg of the second end of described the 4th switch satisfies relational expression:
Vg=OVDD-︱V th
Wherein, OVDD represents described the first voltage, V thThe threshold voltage threshold value that represents described thin film transistor (TFT).
10. pixel compensation circuit according to claim 3, is characterized in that, during described lighting, the voltage Vg of the second end of described the 4th switch satisfies relational expression:
Vg=OVDD-︱V th︱+V ref-V data
Wherein, OVDD represents described the first voltage, V thThe threshold voltage threshold value that represents described thin film transistor (TFT), V refRepresent described reference voltage, V DataRepresent described data voltage.
CN2013100806441A 2013-03-14 2013-03-14 Pixel compensation circuit for AMOLED (Active Matrix/Organic Light Emitting Diode) displayer CN103150991A (en)

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US9773449B2 (en) 2014-09-24 2017-09-26 Au Optronics Corp. Pixel circuit with organic light emitting diode
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CN104867448A (en) * 2015-04-02 2015-08-26 友达光电股份有限公司 Active organic light emitting diode circuit and driving method thereof
US9842539B2 (en) 2015-04-16 2017-12-12 Au Optronics Corp. Pixel control circuit
US10068524B2 (en) 2015-07-06 2018-09-04 Boe Technology Group Co., Ltd. Pixel driving circuit, display substrate and driving method thereof, and display device
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US10475371B2 (en) 2016-11-14 2019-11-12 Int Tech Co., Ltd. Pixel circuit in an electroluminescent display
US10431142B2 (en) 2016-11-14 2019-10-01 Int Tech Co., Ltd. Pixel circuit and electroluminescent display comprising the pixel circuit
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US10446080B2 (en) 2017-04-28 2019-10-15 Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd Display panel, pixel driving circuit, and drving method thereof
CN106910460A (en) * 2017-04-28 2017-06-30 深圳市华星光电技术有限公司 Pixel-driving circuit and display panel
CN106960659A (en) * 2017-04-28 2017-07-18 深圳市华星光电技术有限公司 Display panel, pixel-driving circuit and its driving method
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CN107767813A (en) * 2017-11-15 2018-03-06 武汉华星光电半导体显示技术有限公司 A kind of pixel-driving circuit and liquid crystal display device
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CN108538249A (en) * 2018-06-22 2018-09-14 京东方科技集团股份有限公司 Pixel-driving circuit and method, display device

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