Organic light emitting diode pixel circuit and display device

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...

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

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