AMOLED pixel driving system and AMOLED pixel driving method

Abstract

The invention provides an AMOLED pixel driving system and an AMOLED pixel driving method. The AMOLED pixel driving system comprises a 4T1C (four thin-film transistors and one capacitor) pixel driving circuit and an initial voltage power supply module electrically connected with the pixel driving circuit. The initial voltage power supply module provides a high-level initial signal for the pixel driving circuit in the light emitting stage. The threshold voltage of a driving thin-film transistor can be compensated effectively, and the current flowing through an organic light emitting diode can be stabilized. Moreover, the leakage currents of the gate and the source of the driving thin-film transistor in the light emitting stage can be reduced, and the stability of compensation data in the light emitting stage and the threshold voltage compensation effect can be improved.

Description

technical field [0001] The invention relates to the field of display technology, in particular to an AMOLED pixel driving system and an AMOLED pixel driving method. Background technique [0002] Organic light emitting diode (Organic Light Emitting Display, OLED) display device has self-illumination, low driving voltage, high luminous efficiency, short response time, high definition and contrast, nearly 180° viewing angle, wide operating temperature range, and can realize flexible display and With many advantages such as large-area full-color display, it is recognized by the industry as a display device with the most potential for development. [0003] OLED display devices can be divided into passive matrix OLED (Passive Matrix OLED, PMOLED) and active matrix OLED (Active Matrix OLED, AMOLED) two categories according to the driving method, namely direct addressing and thin film transistor (Thin Film Transistor, TFT) matrix addressing two types. Among them, AMOLED has pixels...

AI Technical Summary

Problems solved by technology

The AMOLED pixel drive circuit completes the pixel drive through four stages of reset, threshold voltage detection, threshold voltage compensation, and light emission in sequence, and can realize compensation for the drift of the threshold voltage characteristic of the driving thin film transistor, that is, the second thin film transistor T20. However, due to The initialization voltage Vini in the AMOLED pixel driving circuit is always at a low level, so the source voltage of the fourth thin film transistor T40 will be lower than the gate and source voltages of the second thin film transistor T20 during the light-emitting phase, resulting in The gate and source of the second thin film transistor T20 generate a leakage current. The existence of the leakage current causes the OLED compensation data to drift, and the voltage at the gate and source of the second thin film transistor T20 is distorted, which affects the compensation effect.

Images