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Pixel circuit and driving method thereof as well as display device

A technology of pixel circuits and driving transistors, which can be used in static indicators, instruments, etc., to solve problems such as afterimages of display panels

Pending Publication Date: 2018-04-20
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing pixel circuits are prone to afterimage problems on the display panel, such as Figure 1a As shown, when there are both high gray scale and low gray scale in the displayed picture, and after a period of continuous display, switch to Figure 1b In the gray-scale picture of the same gray scale shown, due to the hysteresis effect of the driving transistor of the pixel circuit, the I-V curves of the gate-source voltage Vgs of the driving transistor for forward scanning and reverse scanning do not overlap

Method used

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  • Pixel circuit and driving method thereof as well as display device
  • Pixel circuit and driving method thereof as well as display device
  • Pixel circuit and driving method thereof as well as display device

Examples

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example 1

[0091] In the pixel circuit provided by the embodiment of the present invention, such as image 3 As shown, the gate of the first switch transistor M1 is connected to the reset control terminal Comp, and the gate of the fifth switch transistor M5 is connected to the second light emission control terminal EM2; the drive transistor DT, the first switch transistor M1, the second switch transistor M2 and the third switch transistor M3 are P-type transistors, and the fourth switch transistor M4 and the fifth switch transistor M5 are N-type transistors. The corresponding input timing is as Figure 12 shown.

[0092] In the T1 phase (reset phase), Gate2=1, Comp=0, EM1=0, EM2=1. The first switch transistor M1 , the third switch transistor M3 and the fifth switch transistor M5 are turned on, and the second switch transistor M2 and the fourth switch transistor M4 are turned off. The voltage of the first node N1 is Vint, and the voltage of the second node N2 is Vint-Vth.

[0093] In ...

example 2

[0096] In the pixel circuit provided by the embodiment of the present invention, such as Figure 4 As shown, the gate of the first switch transistor M1 is connected to the reset control terminal Comp, and the gate of the fifth switch transistor M5 is connected to the second light emission control terminal EM2; the drive transistor DT, the second switch transistor M2, the fourth switch transistor M4 and the fifth switch transistor M5 are P-type transistors, and the first switch transistor M1 and the third switch transistor M3 are N-type transistors. The corresponding input timing is as Figure 13 shown.

[0097] In the T1 phase (reset phase), Gate2=1, Comp=1, EM1=1, EM2=0. The first switch transistor M1 , the third switch transistor M3 and the fifth switch transistor M5 are turned on, and the second switch transistor M2 and the fourth switch transistor M4 are turned off. The voltage of the first node N1 is Vint, and the voltage of the second node N2 is Vint-Vth.

[0098] In...

example 3

[0101] In the pixel circuit provided by the embodiment of the present invention, such as Figure 5 As shown, the gate of the first switching transistor M1 is connected to the reset control terminal Comp, and the gate of the fifth switching transistor M5 is connected to the second scanning signal terminal Gate2;

[0102] The driving transistor DT, the second switching transistor M2 and the fourth switching transistor M4 are P-type transistors, and the first switching transistor M1 , the third switching transistor M3 and the fifth switching transistor M5 are N-type transistors. The corresponding input timing is as Figure 14 shown.

[0103] In the T1 phase (reset phase), Gate2=1, Comp=1, and EM1=1. The first switch transistor M1 , the third switch transistor M3 and the fifth switch transistor M5 are turned on, and the second switch transistor M2 and the fourth switch transistor M4 are turned off. The voltage of the first node N1 is Vint, and the voltage of the second node N2 ...

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Abstract

The invention discloses a pixel circuit and a driving method thereof as well as a display device. The pixel circuit comprises a data writing-in module, a first light emitting control module, a secondlight emitting control module, a threshold compensation module, an anode resetting module, a capacitor module, a driving transistor and a light emitting diode; in a resetting phase, an anode of the light emitting diode is reset by utilizing the anode resetting module; meanwhile, the second light emitting control module is used for controlling the anode of the light emitting diode to be conducted with a second electrode of the driving transistor; the threshold compensation module is used for controlling a grid electrode of the driving transistor to be conducted with a first electrode of the driving transistor, so that voltage of a first electrode of the driving transistor is discharged toward the direction of the anode resetting module until the driving transistor is in a cut-off state; thus grid source voltage of the driving transistor keeps a constant value and is not influenced by a signal / picture of the last time, so that the residual image problem is solved.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a pixel circuit, its driving method and a display device. Background technique [0002] Organic Light Emitting Diode (OLED) display is one of the hotspots in the field of flat panel display research today. Compared with liquid crystal display, OLED display has the advantages of low energy consumption, low production cost, self-illumination, wide viewing angle and fast response speed. Currently, OLED displays have begun to replace traditional Liquid Crystal Displays (LCDs) in the fields of flat panel displays such as mobile phones, PDAs, and digital cameras. Among them, pixel circuit design is the core technical content of OLED display, which has important research significance. [0003] Existing pixel circuits are prone to afterimage problems on the display panel, such as Figure 1a As shown, when there are both high gray scale and low gray scale in the displayed picture, and a...

Claims

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Application Information

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IPC IPC(8): G09G3/3291G09G3/3266
CPCG09G3/3291G09G3/3266G09G2320/0257
Inventor 羊振中彭宽军高雪岭
Owner BOE TECH GRP CO LTD
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