Pixel circuit structure and method for driving pixel circuit structure

Abstract

The invention provides a pixel circuit structure and a method for driving the pixel circuit structure, which relate to the field of organic light-emitting diodes. The pixel circuit structure comprises a first switch transistor and a fourth transistor, wherein the first switch transistor is used for responding to a first control signal received by the grid of the first switch transistor, and disconnecting / connecting a first voltage signal terminal from / with the source of a drive transistor; the fourth transistor is used for responding to a second control signal received by the grid of the fourth transistor, and disconnecting / connecting the drain of the drive transistor from / with a second voltage signal terminal; when the drain and grid of the drive transistor are connected, the drain of the drive transistor and the second voltage signal terminal are disconnected, so that the drive transistor begins to discharge until the voltage between the source and grid of the drive transistor is equal to a threshold voltage. According to the embodiment of the invention, the stability of a driving current is realized, and the brightness uniformity of a panel is improved. The pixel circuit structure and method for driving the pixel circuit structure disclosed by the invention are suitable to be used in organic light-emitting diode systems.

Description

technical field [0001] The present invention relates to the field of OLED (Organic Light-Emitting Diode, organic light-emitting diode), in particular to a pixel circuit structure and a method for driving the pixel circuit structure. Background technique [0002] AMOLED (Active Matrix / Organic Light Emitting Diode, active matrix organic light emitting diode panel) can emit light is driven by the current generated by driving TFT (Thin Film Transistor, thin film field effect transistor) in saturation state, because the same input When the grayscale voltage is used, different threshold voltages will generate different driving currents, resulting in inconsistency of the currents. [0003] The traditional 2T1C circuit such as figure 1 As shown, the circuit contains only two TFTs, T1 is used as a switch, and DTFT (driver transistor) is used for pixel driving. The circuit operation is also relatively simple, the timing diagram is as follows figure 2 As shown, when the scanning le...

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Problems solved by technology

[0004] Due to the immaturity of the LTPS (low temperature polysilicon) process, at the same time V th There is also drift, even with the same process parameters, the V of TFTs produced in different positions th There is also a large difference, which leads to different driving currents of OLEDs under the same gray scale voltage, so the brightness of different positions of the panel under this driving scheme will be different, and the brightness uniformity is poor

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