Synchronous and asynchronous bi-gate thin film transistor (TFT)-organic light emitting diode (OLED) pixel drive circuit and drive method thereof

Abstract

The invention discloses a synchronous and asynchronous bi-gate thin film transistor (TFT)-organic light emitting diode (OLED) pixel drive circuit and a drive method thereof. The pixel drive circuit comprises a first transistor, a second transistor, a storage capacitor and a light emitting diode, wherein, the first transistor is a synchronous bi-gate TFT and the second transistor is an asynchronous bi-gate TFT. A synchronous bi-gate structure and an asynchronous bi-gate structure are introduced in on the basis of the traditional 2T1C circuit and a precharging voltage and a feedback line are added to the pixel drive circuit. Thus, the maintaining effect to data voltage at a non-gating stage of the storage capacitor is effectively improved. In addition, the threshold voltage compensation of the driving transistors is effectively realized. Thus, the uniformity and the stability of the luminance of displays are ensured. Compared with most pixel drive circuits which are adopted to realize data maintaining and threshold compensation, the transistors, the capacitors and the control lines are saved and the circuit structure is greatly simplified. Thus, the opening ratio and the resolution ratio are increased and the cost is reduced.

Description

technical field [0001] The invention belongs to the field of flat panel display, and in particular relates to a synchronous and asynchronous double-gate TFT-OLED pixel driving circuit and a driving method thereof. Background technique [0002] Active Matrix Organic Light-Emitting Diode (Active Matrix Organic Light-Emitting Diode) AMOLED has the advantages of small size, simple structure, independent light emission, high brightness, good picture quality, large viewing angle, low power consumption, and short response time. Therefore, it has attracted widespread attention and is likely to become a next-generation display technology to replace liquid crystals. [0003] Currently, TFTs used to drive AMOLEDs mainly include amorphous silicon thin film transistors and polysilicon thin film transistors. Due to the current-driven characteristics of OLEDs, amorphous silicon thin film transistors cannot provide sufficient driving current due to low carrier mobility, so polysilicon thin...

AI Technical Summary

Problems solved by technology

[0004] However, most of the AMOLED pixel drive circuits so far have either adopted complex circuit structures to achieve good threshold voltage compensation, or adopted simple circuit structures that failed to achieve threshold compensation well.

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