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Pixel circuit and driving method thereof, and an active matrix organic light-emitting display device

A pixel circuit and power supply technology, applied in the field of active matrix organic light-emitting display devices, can solve the problems of affecting the driving current, unstable voltage of transistor T2, and destroying the quality of the picture, so as to achieve the effect of ensuring uniformity and smooth change process

Active Publication Date: 2017-08-04
KUNSHAN GO VISIONOX OPTO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the actual operation of the pixel circuit is not as ideal as reflected in the above formula, because the gate of the transistor T2 is electrically connected to the source of the transistor T6, so when the leakage / threshold voltage of the transistor T6 changes, it will affect the transistor T2 The gate voltage of the transistor T2 will still be unstable due to the leakage current of the transistor T6, which will affect the drive current passing through the transistor T2 and then affect the stability of the drive current of the OLED device, destroying the picture quality

Method used

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  • Pixel circuit and driving method thereof, and an active matrix organic light-emitting display device
  • Pixel circuit and driving method thereof, and an active matrix organic light-emitting display device
  • Pixel circuit and driving method thereof, and an active matrix organic light-emitting display device

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Embodiment 1

[0046] This embodiment provides a pixel circuit and its driving method, such as image 3 As shown, the pixel circuit 110 is electrically connected to the data driver 130 through the data line Dm (m=1, 2, 3...), and connected to the scan driver 120 through the row scanning line Sn (different values ​​of n indicate different row scanning lines) Electrically connected to the emission control driver 140 through emission control signal lines En (n=1, 2, 3 . . . ). Such as Figure 4 As shown, each pixel circuit further includes: an OLED device, transistors T1-T6, capacitor C1, capacitor C2 and an energy storage element.

[0047] The gate of the transistor T1 is electrically connected to the row scan line Sn, the first end of the capacitor C2 and the gate of the transistor T3; its first end is connected to the second end of the transistor T4 and the transistor The first end of T2 is electrically connected; the second end thereof is electrically connected to the data voltage signal....

Embodiment 2

[0071] This embodiment provides a driving method for driving the pixel circuit in Embodiment 1, including the following steps:

[0072] Initialization: control row scan line Sn, light emission control signal En, and data voltage signal are at high level, and row scan line Sn-1 is a low-level signal above the second order, where Figure 5 The row scanning line Sn-1 shown is a second-order low-level signal (first-order low voltage V2, second-order low voltage V3), Figure 6 The row scanning line Sn-1 shown is a four-level low-level signal (the first-level low voltage V2, the second-level low voltage V3, the third-level low voltage V4, and the fourth-level low voltage V5).

[0073] Data writing: control the row scanning line Sn-1 and the light emitting control signal En to be at high level; the row scanning line Sn and the data voltage signal to be at low level.

[0074] Lighting: control the light emitting control signal En to be at low level, and the row scanning line Sn-1, ro...

Embodiment 3

[0077] This embodiment provides an active matrix organic light emitting display device, such as image 3 As shown, it includes: several pixel units 110 , a scan driver 120 , a data driver 130 and an emission control driver 140 . The pixel units 110 are arranged in a matrix at the crossing area of ​​the row scanning line Sn and the data line Dm, and are electrically connected to the data driver 130 through the data line Dm, and are electrically connected to the scan driver 120 through the row scanning line Sn. Line En (m=1,2,3,...).

[0078] Each pixel unit 110 is initialized during the first time period when the row scan line Sn provides the scan control signal, and the pixel unit 110 receives the data voltage signal line Dm during the second time period when the row scan line Sn provides the scan control signal. During the third time period, the scan control signal provided by the row scan line Sn transitions to an appropriate level, thereby providing current to the organic ...

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Abstract

The invention provides a pixel circuit, a drive method thereof and an active matrix organic light-emitting diode. According to the pixel circuit, a capacitor C3 is connected between a grid electrode of a transistor T2 and a grid electrode of a transistor T6 in series, that is, the threshold value voltage information of the transistor T6 is stored to the capacitor C3, and when the threshold value voltage of the transistor T6 fluctuates, compensation can be conducted through charging or discharging of the capacitor C3. In the initial phase, line scanning lines Sn-1 are second-order low-level signals or multi-order low-level signals and can make voltage change relatively gently; due to the fact that the line scanning lines Sn-1 are electrically connected with the grid electrode of the transistor T6, the influence of Feed Through voltage generated by stray capacitance Cgd in the transistor T6 when the switching voltage is shut off instantaneously can be weaken effectively through the stepwise low-potential, and the uniformity of luminance of the OLED can be further guaranteed.

Description

technical field [0001] The present invention relates to the field of organic light-emitting display technology, in particular to a method that can effectively improve the leakage current I of TFT devices. off An organic light-emitting pixel circuit with poor display caused by too large an organic light-emitting pixel circuit, a driving method thereof, and an active matrix organic light-emitting display device. Background technique [0002] In flat panel display technology, AMOLED (Active Matrix Organic Light Emitting Diode---active matrix organic light-emitting display device) is characterized by its thinness, active light emission, fast response speed, wide viewing angle, rich color and high brightness, low power consumption, and durability. The advantages of high and low temperature have been applied to high-performance and large-size displays, and have gradually become a new generation of display technology in the display field. [0003] At present, AMOLED display techno...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/3225G09G3/3258
Inventor 张金方朱修剑韩真真
Owner KUNSHAN GO VISIONOX OPTO ELECTRONICS CO LTD