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Pixel circuit, array substrate and display device

A pixel circuit and electrode technology, which is applied in the field of organic light-emitting display, can solve problems such as differences in the current of organic light-emitting diodes and uneven light emission of display devices, and achieve the effects of avoiding hysteresis effects, eliminating uneven light emission, and improving uniformity

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

AI Technical Summary

Problems solved by technology

[0003] However, due to the influence of the manufacturing process, the threshold voltages of the transistors M20 used to drive the organic light-emitting diodes in each pixel circuit in the same display device are different, so when the same data voltage is applied to multiple pixel circuits, the The current of the organic light-emitting diode in each pixel circuit is different, and then the phenomenon of uneven light emission of the display device appears.

Method used

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  • Pixel circuit, array substrate and display device
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  • Pixel circuit, array substrate and display device

Examples

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Embodiment 1

[0039] combine Figure 2~3d As shown, a detailed description of a pixel circuit provided in Embodiment 1 of the present application is given, referring to figure 2 As shown, it is a schematic structural diagram of a pixel circuit provided in Embodiment 1 of the present application, wherein the pixel circuit is used to drive a light-emitting element, and the pixel circuit includes:

[0040] The first transistor M1, the second transistor M2, the third transistor M3, the fourth transistor M4, the fifth transistor M5, the sixth transistor M6, the drive transistor M0, the first capacitor C1 and the second capacitor C2; In an example, the first transistor M1 , the second transistor M2 , the third transistor M3 , the fourth transistor M4 , the fifth transistor M5 , the sixth transistor M6 and the driving transistor M0 are all P-type transistors.

[0041] The gate of the first transistor M1 is connected to the first driving signal, the first electrode of the first transistor M1 is c...

Embodiment 2

[0067] Based on the pixel circuit provided in Embodiment 1, this embodiment of the present application also provides another pixel circuit. For details, refer to Figure 4a~4c as shown, Figure 4a It is a schematic structural diagram of a pixel circuit provided in Embodiment 2 of the present application, Figure 4b for Figure 4a Provides a timing diagram of the drive signals of the pixel circuit, Figure 4c for Figure 4b Schematic diagram of the current pathway in T1 phase. It should be noted that the similarities between the pixel circuit provided by the second embodiment of the present application and the pixel circuit provided by the first embodiment will not be described in detail, and the differences between the pixel circuit provided by the second embodiment and the pixel circuit provided by the first embodiment The reason is that the driving signals for driving the sixth transistor M6 are different. in,

[0068] refer to Figure 4a As shown, the first transisto...

Embodiment 3

[0078] The present application also provides a pixel circuit, combined with Figure 5-6d As shown, the pixel circuit provided in Embodiment 3 of the present application will be described in detail.

[0079] refer to Figure 5 As shown, it is a schematic structural diagram of a pixel circuit provided in Embodiment 3 of the present application, wherein the pixel circuit is used to drive a light-emitting element, and the pixel circuit includes:

[0080] The first transistor M1, the second transistor M2, the third transistor M3, the fourth transistor M4, the fifth transistor M5, the sixth transistor M6, the drive transistor M0, the first capacitor C1 and the second capacitor C2; In an example, the first transistor M1 , the second transistor M2 , the third transistor M3 , the fourth transistor M4 , the fifth transistor M5 , the sixth transistor M6 and the driving transistor M0 are all P-type transistors.

[0081] The gate of the first transistor M1 is connected to the first drivi...

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Abstract

The invention provides a pixel circuit, an array substrate and a display device. The pixel circuit comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a driving transistor, a first capacitor and a second capacitor. By means of cooperation of the transistors and the capacitors, drive current which is generated by the driving transistor and used for driving a light emitting element to emit light is unrelated to intrinsic threshold voltage of the driving transistor, threshold shift caused by techniques is compensated, the problem of nonuniformity in light emission of the display device is solved, and uniformity in light emission of the display device is improved; in addition, the threshold voltage of the driving transistor is compensated by means of source following, and accordingly hysteresis is avoided.

Description

technical field [0001] The present invention relates to the technical field of organic light-emitting display, and more specifically, relates to a pixel circuit, an array substrate 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. refer to figure 1 Shown 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 tr...

Claims

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Application Information

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IPC IPC(8): G09G3/32H01L27/32G09G3/3233
Inventor 吴桐钱栋顾寒昱
Owner WUHAN TIANMA MICRO ELECTRONICS CO LTD
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