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Organic light emitting diode pixel circuit and display device

一种发光二极管、像素电路的技术,应用在静态指示器、仪器等方向,能够解决图像显示不均匀等问题,达到降低不均匀性、减小电流差异的效果

Active Publication Date: 2014-08-06
WUHAN TIANMA MICRO ELECTRONICS CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this 2T1C pixel circuit, since the drain current for driving the OLED to emit light is related to the threshold voltage of the driving transistor T2, when the threshold voltages of the driving transistor T2 in different pixel units are different, different OLEDs receive the same image data When the signal is used, the current driving its light emission is also different, resulting in uneven display of the entire image
[0004] To sum up, when using the traditional organic light emitting diode pixel circuit, due to the different threshold voltages of the drive transistors in different pixel units, when different OLEDs receive the same image data signal, the currents driving them to emit light are different, thus resulting in uneven image display across the display panel

Method used

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  • Organic light emitting diode pixel circuit and display device
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  • Organic light emitting diode pixel circuit and display device

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Embodiment Construction

[0031] In the organic light emitting diode pixel circuit and the display device provided by the embodiments of the present invention, since the driving signal generation module can read and store the threshold voltage of the driving transistor in the threshold voltage reading stage, and can receive the image data signal in the signal loading stage, and according to the threshold voltage reading stage The received display signal of the frame and the threshold voltage of the driving transistor stored in the threshold voltage reading stage generate a driving signal, which makes the driving signal related to the threshold voltage of the driving transistor. Therefore, the driving signal is used in the waiting stage and the light-emitting stage When the driving transistor is controlled to drive the OLED to emit light, the influence of the threshold voltage of the driving transistor on the drain current of the driving transistor will be offset by the existence of the threshold voltage ...

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Abstract

The embodiment of the invention provides an organic light emitting diode pixel circuit and a display device which are used for solving the problem that because threshold voltages of drive transistors in different pixel units of a traditional organic light emitting diode pixel circuit are different, images on a whole display panel can not be displayed evenly. A drive signal generation module in the organic light emitting diode pixel circuit reads and stores the threshold voltages of the drive transistors in the threshold voltage reading stage, receives an image data signal in the signal loading stage, and generates a drive signal according to the received image data signal or the stored threshold voltages of the drive transistors in the threshold voltage reading stage, and therefore the drive signal is made to be relevant to the threshold voltages of the drive transistors.

Description

technical field [0001] The present invention relates to the field of display technology, and in particular, to an organic light emitting diode pixel circuit and a display device. Background technique [0002] Active Matrix Organic Light Emitting Diode (AMOLED) displays have been widely used due to their advantages of wide viewing angle, good color contrast effect, fast response speed and low cost. However, due to the non-uniformity of the thin film transistor (Thin Film Transistor, TFT) array substrate during the process, the threshold voltage shifts. [0003] The traditional 2T1C pixel circuit such as figure 1 As shown, it includes: a switching transistor T1, a driving transistor T2, a storage capacitor C1 and an organic light emitting diode (Organic Light Emitting Diode, OLED), wherein the gate of the switching transistor T1 receives a scan signal Scan, and the scan signal Scan contains the pixel circuit The signal on the connected gate line, the source (or drain) of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32G09G3/3225G09G3/3291
CPCG09G3/3225G09G3/3291G09G2300/043G09G2300/0819G09G2300/0842G09G2300/0852G09G2300/0861G09G2310/08G09G2320/0233G09G2320/043G09G2320/045G09G2310/062
Inventor 张丽胡小叙
Owner WUHAN TIANMA MICRO ELECTRONICS CO LTD
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