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

A pixel circuit and display panel technology, applied in the field of driving, can solve the problems of uneven display, affect the luminous brightness of light-emitting elements, affect the display effect, etc., and achieve the effect of reducing the impact, improving the display effect, and improving the threshold shift.

Active Publication Date: 2020-04-21
WUHAN TIANMA MICRO ELECTRONICS CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] Embodiments of the present invention provide a pixel circuit and its driving method, a display panel, and a display device, so as to solve the problem in the prior art that the gate voltage of the driving transistor changes due to the influence of the leakage current, which affects the light-emitting brightness of the light-emitting element and causes Uneven display, technical problems that affect the display effect

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

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Embodiment Construction

[0039] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.

[0040] As mentioned in the background art, due to reasons such as manufacturing process and device aging, the threshold voltage of the driving transistor in the pixel driving circuit drifts, resulting in uneven display. However, the pixel circuit with threshold compensation function in the prior art has a complex structure and a large size, which is not conducive to the high PPI of the display panel; at the same time, it cannot meet the requirements of light transmission and display in the high light transmission a...

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Abstract

The embodiment of the invention discloses a pixel circuit and a driving method thereof, a display panel and a display device. A data writing module of a pixel circuit can write data signals into a grid electrode of a driving transistor and a first pole plate of a storage capacitor in the data writing stage. A reset module can write a reset signal into a second polar plate of a storage capacitor ina data writing stage. A threshold value compensation module can write a threshold value compensation signal into a second polar plate of the storage capacitor in a threshold value compensation stage,so that the potential of a first polar plate of the storage capacitor is adjusted to a first potential, and threshold value compensation is carried out on the driven transistor; wherein the thresholdcompensation signal is greater than the reset signal; the driving transistor can provide driving current for the organic light-emitting element in a light-emitting stage so as to drive the organic light-emitting element to emit light. The pixel circuit provided by the embodiment of the invention is simple in structure and relatively small in size, and threshold compensation can be realized.

Description

technical field [0001] The present invention relates to the field of driving technology, in particular to a pixel circuit and a driving method thereof, a display panel and a display device. Background technique [0002] Organic Light Emitting Diode (OLED) displays have the advantages of self-illumination, low driving voltage, high luminous efficiency, short response time, flexible display, etc., and become the display with the most development potential at present. [0003] The OLED element of the OLED display is a current-driven element, and a corresponding pixel driving circuit needs to be provided to provide a driving current for the OLED element so that the OLED element can emit light. A pixel driving circuit of an OLED display generally includes a driving transistor, a switching transistor and a storage capacitor. The driving transistor can generate a driving current for driving the OLED element according to the voltage of its gate. However, due to reasons such as tech...

Claims

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Application Information

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IPC IPC(8): G09G3/3208
CPCG09G3/3208G09G2320/0233G09G3/3233G09G2300/0465G09G2300/0819G09G2300/0842G09G2300/0861G09G2320/045G09G2354/00G09G3/325G09G3/3266G09G3/3291G09G3/3659
Inventor 周茂清陈菲向东旭
Owner WUHAN TIANMA MICRO ELECTRONICS CO LTD
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