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

A technology of a pixel circuit and a driving method, which is applied in the field of organic light-emitting display, can solve problems such as uneven light emission of a display, eliminate the influence of bad factors, improve light emission uniformity and display effect, and improve the effect of uneven light emission

Active Publication Date: 2014-12-10
WUHAN TIANMA MICRO ELECTRONICS CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In actual use, it is found that the organic light-emitting diode display has uneven luminescence

Method used

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

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Embodiment Construction

[0050] 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 making creative efforts belong to the protection scope of the present invention.

[0051] The researchers found that in actual use, organic light-emitting diode displays have uneven light emission. refer to figure 1Shown is a circuit diagram of an existing pixel circuit in an organic light emitting diode display. Most of the existing pixel circuits adopt a 2T1C structure, that is, include two transistors and a capacitor. Wherein, the transistor M20 is used as a current driving transistor to provide a light-emitting current for the organic l...

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Abstract

The invention discloses a pixel circuit as well as a driving method, a display panel and a display device thereof. The pixel circuit comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a driving transistor, a first capacitor, a second capacitor and a light-emitting element, through the cooperating driving between all transistors and the two capacitors, the driving current is enabled to be unrelated to the threshold voltage of the driving transistor and the step voltage of the two ends of the light-emitting element finally. According to the pixel circuit as well as the driving method, the display panel and the display device thereof, the influence of undesirable factors is eliminated, the problem that the conventional display device is uneven in light emission is further improved effectively, and the uniformity of luminance and the display effect of the display device are improved.

Description

technical field [0001] The present invention relates to the technical field of organic light-emitting display, and more specifically, to a pixel circuit and its driving method, a display panel, and a display device. Background technique [0002] With the continuous development of multimedia, organic light emitting diode (Organic Light Emitting Diode, OLED) display has attracted attention in the display market due to its simple structure and excellent operating temperature, contrast, and viewing angle. Organic light emitting diode displays include passive matrix OLED displays and active matrix OLED displays, and active matrix OLED displays are widely used due to low power consumption. In actual use, it is found that organic light-emitting diode displays have non-uniform light emission. Contents of the invention [0003] In view of this, the present invention provides a pixel circuit and its driving method, a display panel, and a display device. By compensating the threshol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32G09G3/3208
Inventor 马志丽钱栋
Owner WUHAN TIANMA MICRO ELECTRONICS CO LTD
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