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

A pixel circuit and driving signal technology, applied in the field of organic light-emitting display, can solve problems such as uneven light emission of the display

Active Publication Date: 2017-06-06
WUHAN TIANMA MICRO ELECTRONICS CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Based on this, the embodiment of the present application provides a pixel circuit, refer to image 3 As shown in , it is a schematic structural diagram of a pixel circuit provided in an embodiment of the present application, wherein the pixel circuit includes:

[0048] The first transistor M1, the second transistor M2, the third transistor M3, the fourth transistor M4 and the fifth transistor M5, the driving transistor M0, the first capacitor C1, the second capacitor C2 and the light emitting element D; wherein,

[0049] The driving transistor M0 is used to determine the magnitude of the driving current, and the magnitude of the driving current is determined by the voltage difference between the gate and the source of the driving transistor M0;

[0050] The first transistor M1 is controlled by the first driving signal S1, and is used to transmit the reference voltage signal Vref to the gate of the driving transistor M0;

[0051] The second transistor M2 is controlled b...

Embodiment 2

[0075] In addition, a preferred embodiment of the present invention also provides a display panel, including a pixel circuit, wherein the pixel circuit adopts the pixel circuit described in the above-mentioned embodiments.

[0076] Embodiment 2 The pixel circuit provided by the display panel may have a pure PMOS structure, or may have a CMOS structure in which the driving transistor is a Pmos transistor and other transistors are NMOS transistors. In the corresponding working process, the data signal input terminal needs to input a value equal to the reference voltage signal in the threshold grabbing step of the pixel circuit.

[0077] The pixel circuit in the display panel makes the driving current not only independent of the threshold voltage of the driving transistor itself, but also independent of the voltage drop of the power signal and the voltage across the two ends of the light-emitting element through the cooperation between each transistor and the capacitor, thus elimi...

Embodiment 3

[0080] The third preferred embodiment of the present invention provides a display device, the display device includes a display panel, wherein the display panel adopts the display panel as described in the second embodiment.

[0081] It should be noted that the "coupling" mentioned in the embodiments of the present invention refers to the electrical connection between two components, including direct electrical connection and indirect electrical connection.

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PUM

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Abstract

The invention discloses a pixel circuit, a driving method, a display panel and a display device. The pixel circuit comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a drive transistor, a first capacitor and a second capacitor. By the matching of each transistor and each capacitor, the pixel circuit achieves at least one of the following benefits that the voltage drop of threshold voltages and power supply signals of a drive current and the drive transistor is irrelevant to cross voltages of the two ends of a light emitting component, and the influence of the factors is eliminated, so that the problem of non-uniformity of luminance of the display device is effectively improved, 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, excellent operating temperature, contrast ratio, viewing angle and other advantages. 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 compe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/3233
Inventor 马志丽钱栋顾寒昱
Owner WUHAN TIANMA MICRO ELECTRONICS CO LTD
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