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Pixel compensating circuit, driving method thereof, display panel and display device

A technology for compensating circuits and pixels, applied to static indicators, instruments, etc., can solve problems affecting image display effects and uneven display brightness, and achieve the effects of improving uniformity, maintaining stable driving current, and avoiding impact

Active Publication Date: 2019-07-12
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to reasons such as technological process and device aging, the threshold voltage V of the driving transistor driving the OLED to emit light in the pixel circuit will be th There is inhomogeneity, which causes the current flowing through the OLED to change, resulting in uneven display brightness, which affects the display effect of the entire image

Method used

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  • Pixel compensating circuit, driving method thereof, display panel and display device
  • Pixel compensating circuit, driving method thereof, display panel and display device
  • Pixel compensating circuit, driving method thereof, display panel and display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] figure 2 The circuit timing diagram corresponding to the pixel compensation circuit shown in image 3 shown. Specifically, choose the image 3 In the shown input timing diagram, there are five stages in total including recovery stage T1 , voltage adjustment stage T2 , threshold value latch stage T3 , data input stage T4 and light emitting stage T5 .

[0071] In the recovery phase T1, SCAN1=0, SCAN2=1, SCAN3=0, EM=1.

[0072] Since SCAN1=0, the first switching transistor M1 is turned off. Since SCAN3=0, the fourth switching transistor M4 is turned off. Since SCAN2=1, both the second switching transistor M2 and the third switching transistor M3 are turned on. Since EM=1, the fifth switching transistor M5 is turned on. The turned-on fifth switch transistor M5 and the third switch transistor M3 provide the voltage Vdd of the signal of the first voltage signal terminal VDD to the gate of the driving transistor M0, so that the voltage of the gate of the driving transis...

Embodiment 2

[0086] figure 2 The circuit timing diagram corresponding to the pixel compensation circuit shown in Figure 4 shown. Specifically, choose the Figure 4 In the shown input timing diagram, there are five stages in total including recovery stage T1 , voltage adjustment stage T2 , threshold value latch stage T3 , data input stage T4 and light emitting stage T5 .

[0087] In the recovery phase T1, the voltage of the signal at the first voltage signal terminal VDD is the second preset power supply voltage Vdd2, SCAN1=0, SCAN2=1, SCAN3=0, EM=1.

[0088] Since SCAN1=0, the first switching transistor M1 is turned off. Since SCAN3=0, the fourth switching transistor M4 is turned off. Since SCAN2=1, both the second switching transistor M2 and the third switching transistor M3 are turned on. Since EM=1, the fifth switching transistor M5 is turned on. The turned-on fifth switching transistor M5 and the third switching transistor M3 provide the signal of the second preset power supply...

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Abstract

The invention discloses a pixel compensation circuit, a driving method thereof, a display panel and a display device. The data circuit, the voltage circuit, the control circuit, the driving transistorand the storage capacitor are matched with one another, so the compensation of the threshold voltage Vth of the driving transistor is realized; therefore, the driving current of the driving transistor for driving the light-emitting device to emit light is irrelevant to the threshold voltage of the driving transistor, the influence of the threshold voltage of the driving transistor on the drivingcurrent flowing through the light-emitting device can be avoided, the driving current can be kept stable, and the uniformity of image brightness of a display area in the display device can be improved.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a pixel compensation circuit, a driving method thereof, a display panel and a display device. Background technique [0002] Organic Light Emitting Diode (OLED) displays have the advantages of low energy consumption, low production cost, self-illumination, wide viewing angle, and fast response, and are one of the hot spots in the field of flat panel display research today. Among them, the design of the pixel circuit for controlling the OLED to emit light is the core technical content of the OLED display. Since OLED is current-driven, a stable current is needed to control its light emission. However, due to reasons such as technological process and device aging, the threshold voltage V of the driving transistor driving OLED to emit light in the pixel circuit will be reduced. th There is inhomogeneity, which causes the current flowing through the OLED to change, resulting in unev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/3225
CPCG09G3/3225G09G3/3233G09G2300/0819G09G2300/0842G09G2300/0861G09G2310/0262G09G2310/08G09G2320/045G09G3/2092G09G3/32G09G2310/0278G09G2330/023
Inventor 陈帅唐秀珠唐滔良胡双董兴田振国谭美玲王欢
Owner BOE TECH GRP CO LTD
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