AMOLED pixel driving circuit

Abstract

The invention provides an AMOLED pixel driving circuit. According to a mode of arranging a thin film transistor (M2) controlled by a luminous control signal (EM) between an organic light emitting diode (D1) and direct current power voltage (VDD), or a mode of adopting alternating current power voltage (VDD), whether the organic light emitting diode (D1) is luminous or not is controlled, the luminous control signal (EM) or the alternating current power voltage (VDD) is set to only provide high level at a drive light-emitting stage (Drive), and low level is provided at the other stages, so that the OLED is positioned in a closed state at unnecessary luminous time and is prevented from giving light at the unnecessary luminous time. The problem that the conventional AMOLED pixel driving circuit generates unnecessary luminescence in the process of compensating and driving threshold voltage shift of the thin film transistor is solved, the service life of the OLED can be prolonged, and the actual display effect of the panel is optimized.

Description

technical field [0001] The invention relates to the field of display technology, in particular to an AMOLED pixel driving circuit. 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 ) There are two types of matrix addressing. Among them, AMOLED has pixels arranged in an arra...

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Problems solved by technology

[0005] The purpose of the present invention is to provide an AMOLED pixel drive circuit to solve the problem that the existing AMOLED pixel drive circuit will produce unnecessary light emission during the process of compensating and driving the threshold voltage drift of the thin film transistor, so that the OLED is in the off state during the unnecessary light emission time, It can prolong the life of OLED and optimize the actual display effect of the panel

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