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Pixel driving circuit and driving method thereof, array substrate and display device

A pixel driving circuit and potential technology, applied in the field of display devices, pixel driving circuits and their driving methods, and array substrates, can solve problems such as threshold voltage drift of drive switch tubes, and achieve the effect of avoiding threshold voltage Vth drift and ensuring normal output

Active Publication Date: 2016-09-21
BOE TECH GRP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a pixel driving circuit and its driving method, an array substrate, and a display device, which are used to solve the problem of threshold voltage drift of the driving switching tube caused by the long-term operation of the gate of the driving switching tube at a high voltage

Method used

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  • Pixel driving circuit and driving method thereof, array substrate and display device
  • Pixel driving circuit and driving method thereof, array substrate and display device

Examples

Experimental program
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Embodiment 1

[0068] A switching tube made of oxide is selected as the driving switching tube Td in the pixel driving circuit, that is, the threshold voltage of the driving switching tube Td is 0V.

[0069] During the drift suppression period p1, the electric potential of the reference signal VSTRESS is set to -16V to realize that it will input the electric potential V of the node N_1 N_1 placed at a negative potential;

[0070] In the reset period p2, the potential of the reference signal VSTRESS is raised to 0V to realize that it will drive the switch tube Td to be turned on; at the same time, the potential of the power control signal G4 is set to 25V to turn on the fourth switch tube T4 and turn on The low potential VDD_L of the power supply voltage signal VDD is set to -4V, so that the potential Vpos of the output node pos is reset to -4V;

[0071] In the compensation period p3, the high potential VDD_H of the power supply voltage signal VDD is set to 20V, and the low potential Data_L ...

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Abstract

The invention discloses a pixel driving circuit and a driving method thereof, an array substrate and a display device, relates to the technical field of display, and aims at solving the problems of threshold voltage shift of a driving switching tube caused by the fact that the gate electrode of the driving switching tube works under high voltage for a long time. The pixel driving circuit comprises a drift suppression unit, a data write-in unit, a compensation unit and a working unit. The drift suppression unit receives a reference control signal and a reference signal. The drift suppression unit is used for outputting the reference signal to the compensation unit under the control of the reference control signal during a drift suppression period and a resetting period. The potential of the reference signal is lower than 0 during the drift suppression period. The pixel driving circuit is used for driving the working unit to work.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a pixel driving circuit and a driving method thereof, an array substrate, and a display device. Background technique [0002] Organic light-emitting diode (Organic Light-Emitting Diode, hereinafter referred to as OLED) display device has many advantages such as self-illumination, fast response speed, high contrast ratio, wide viewing angle, etc., and is a display device that has attracted extensive attention at present. [0003] An OLED display device includes a plurality of pixels arranged in a matrix, and driving and controlling each pixel to display gray scales depends on a pixel driving circuit inside the pixel. In the traditional pixel drive circuit, the screen display of the OLED display device is generally realized by driving the switch tube to drive the corresponding OLED in the pixel; during the working process of this drive switch tube, its gate will work under...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/3258
CPCG09G3/3258G09G3/3233G09G2300/0852G09G2300/0861G09G2300/0866G09G2320/043G09G2320/045G09G2300/0819G09G2330/028
Inventor 张杨刘金良
Owner BOE TECH GRP CO LTD
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