Pixel circuit for compensating shift of threshold voltage and thin film transistor backplane

Abstract

The embodiment of the invention provides a pixel circuit for compensating shift of a threshold voltage and a thin film transistor backplane, so as to solve the problem of uneven display of an image caused by the shift of the threshold voltage in the prior art. The pixel circuit comprises a driver module and a signal loading module, wherein the driver module comprises a VDD (virtual device driver) signal source, a driver transistor T1, a storage capacitance C1 and an OLED (organic light emitting diode) D1; a grid electrode of the driver transistor T1 is connected with an output end of the signal loading module and drives the OLED D1 to emit light; one end of the storage capacitance C1 is connected with an output end of the VDD signal source, and the other end of the storage capacitance C1 is connected with the grid electrode of the driver transistor T1; the driver module further comprises a p-shaped decaying transistor T2, the grid electrode is connected with a source electrode and is connected with the output end of the VDD signal source, a drain electrode is connected with the source electrode of the driver transistor T1; alternatively, the driver module further comprises a n-shaped decaying transistor T2, the grid electrode is connected with the drain electrode and is connected with the output end of the VDD signal source, and the source electrode is connected with that of the driver transistor T1.

Description

technical field [0001] The invention relates to the technical field of liquid crystal display, in particular to a pixel circuit and a thin film transistor backplane for compensating threshold voltage drift. 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, fast response and low cost. However, due to the unevenness and stability of the thin film transistor (Thin Film Transistor, TFT) backplane during the process, the threshold voltage will drift. [0003] The traditional 2T1C pixel circuit such as figure 1 As shown, it includes: gate signal source VGATE, image frame data signal source VDATA, VDD signal source, switching transistor T1, driving transistor T2, storage capacitor C1 and organic light emitting diode (Organic Light Emitting Diode, OLED) D1, etc., where the switching transistor The gate of T1 is connected to the output terminal of the g...

AI Technical Summary

Problems solved by technology

[0004] An embodiment of the present invention provides a pixel circuit and a thin film transistor backplane for compensating for threshold voltage drift, so as to solve the problems caused by the threshold voltage drift of the existing backplane thin film transistors that flow through different OLEDs when the same image frame data signal is received. The uneven current causes the problem of uneven display of the entire image

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