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Pixel circuit and display device

A pixel circuit and electrode technology, which is applied in the field of organic light-emitting display, can solve the problems of light-emitting diode current difference and uneven light emission of display devices, and achieve the effects of avoiding insufficient brightness, eliminating uneven light emission, and improving the uniformity of light emission

Active Publication Date: 2018-09-21
WUHAN TIANMA MICRO ELECTRONICS CO LTD
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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 used to drive the 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 data voltage will flow through the multiple pixels. The current of the light-emitting diodes in the circuit is different, and then the phenomenon of uneven light emission of the display device appears

Method used

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Embodiment 1

[0031] combine Figure 2-7 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 the light-emitting element OLED, and the light-emitting element OLED is a light-emitting diode, and the pixel circuit includes:

[0032] 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 driving transistor M0, the first capacitor C1 and the second capacitor C2;

[0033] The gate of the first transistor M1 is connected to the first driving signal S1, the first electrode of the first transistor M1 is connected to the anode voltage Vpvdd, and the second electrode of the first transistor M1 is connected to the driving signal S1. the source of transistor M0...

Embodiment 2

[0069] combine Figure 9 and 10 As shown, a pixel circuit provided in Embodiment 2 of the present application is described in detail, and reference Figure 9 As shown, it is a schematic structural diagram of a pixel circuit provided in Embodiment 2 of the present application, wherein the pixel circuit is used to drive the light-emitting element OLED, the light-emitting element OLED is a light-emitting diode, and the pixel circuit includes:

[0070] 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 driving transistor M0, the first capacitor C1 and the second capacitor C2;

[0071] The gate of the first transistor M1 is connected to the first driving signal S1, the first electrode of the first transistor M1 is connected to the anode voltage Vpvdd, and the second electrode of the first transistor M1 is connected to the driving signal S1. the source of transistor M0;

[007...

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Abstract

The invention discloses a pixel circuit and a display device. The pixel circuit comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixthtransistor, a drive transistor, a first capacitor and a second capacitor. Due to match between the transistors and the capacitors, a threshold voltage of the drive transistor is compensated in a source following manner, so that drive current which is generated by the drive transistor and is used for driving a luminous element to give light is irrelevant to the threshold voltage of the drive transistor, the threshold shift defect caused by the process is further compensated, the problem that the display device is non-uniform in light emission is solved, and the light emission uniformity of thedisplay device is improved. In addition, due to match among the various transistors, the drive transistor and the anode of the luminous element are reset, the phenomenon that threshold voltage grab isinconsistent during while switching high and low gray scales can be avoided, and the problem that the brightness of a first frame is insufficient after ghost and gray-scale jump is further solved.

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 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. The existing pixel circuit adopts a 3T1C structure, that is, includes three P-type transistors and a capacitor. Wherein, when the existing pixel circuit is working, the transistor T1 transm...

Claims

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Application Information

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IPC IPC(8): G09G3/3225
CPCG09G3/3225G09G3/3233G09G3/3258G09G3/3291G09G2300/043G09G2300/0819G09G2300/0842G09G2300/0852G09G2310/0245G09G2310/0262G09G2310/08G09G2300/0426G09G2300/0439
Inventor 朱仁远李玥向东旭高娅娜周星耀
Owner WUHAN TIANMA MICRO ELECTRONICS CO LTD
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