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Pixel driving circuit and display device

A pixel driving circuit and display device technology, which is applied to static indicators, instruments, etc., can solve problems such as bad OLED panels, changes in driving current, and affecting image quality, and achieve the effect of improving display characteristics

Inactive Publication Date: 2018-09-04
WUHAN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to long-term operation, the threshold voltage Vth of the driving thin film transistor A2 will drift, which will lead to changes in the driving current of the light-emitting element OLED, which will cause defects in the OLED panel and affect the image quality.

Method used

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  • Pixel driving circuit and display device

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Embodiment Construction

[0012] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0013] figure 2 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present invention. Such as figure 2 As shown, the pixel driving circuit 10 includes a first reset module 11 , a second reset module 12 , a compensation module 13 and a light emitting module 14 . Wherein, the compensation module 13 is respectively connected with the first reset module 11 and the light emitting module 14 , and the second reset module 12 ...

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Abstract

The invention discloses a pixel driving circuit and a display device. The pixel driving circuit comprises a first reset module, a second reset module, a compensation module and a light emitting module, wherein the first reset module is used for transmitting a first reset voltage to the compensation module under the control of a first control signal so as to reset the compensation module; the second reset module is used for transmitting a second reset voltage to the light emitting module under the control of a second control signal so as to reset the light emitting module; the compensation module is used for writing in a data signal under the control of the second control signal and performing threshold voltage compensation; and the light emitting module is used for emitting light under thecontrol of a third control signal. According to the above mode, the pixel driving circuit can adjust the contrast for displaying a black screen through adjusting the first reset voltage and the second reset voltage while realizing compensation for the threshold voltage, so that the display characteristics of the display device are improved.

Description

technical field [0001] The invention relates to the field of liquid crystal display, in particular to a pixel driving circuit and a display device. Background technique [0002] Organic Light Emitting Diodes (OLEDs) have a wide color gamut, high contrast ratio, energy saving, and foldability, making them highly competitive in next-generation displays. Among them, active matrix organic light emitting diode (AMOLED) technology is one of the key development directions of flexible display. The basic driving circuit of AMOLED such as figure 1 As shown, it is a 2T1C mode, that is, it includes two thin film transistors and a storage capacitor, specifically, it includes a switching thin film transistor A1, a driving thin film transistor A2 and a storage capacitor C1. The driving current of the light-emitting element OLED is controlled by the driving thin film transistor A2, and its current size is: I OLED =k(V gs -V th ) 2 ; Wherein, k is the current amplification factor of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/3258
CPCG09G3/3258G09G2320/066G09G2320/0238G09G3/3233G09G2320/045G09G2300/0861G09G2300/0842G09G2300/0819
Inventor 李骏
Owner WUHAN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD
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