OLED pixel circuit and driving method thereof, display panel and display device

Abstract

The invention relates to an OLED pixel circuit and a driving method thereof, a display panel and a display device. The OLED pixel circuit comprises a charge control module, a driving transistor, a reset control module, a light emitting control module and a light emitting device, wherein the charge control module is connected with a data line and the reset control module, and is used for introducing data signals provided by the data line to the reset control module, and the reset control module is connected with the driving transistor, and is used for resetting and compensating the driving transistor according to the data signals, so that a control electrode of the driving transistor has a first preset electric potential; the driving transistor is used for generating driving current allowing the light emitting device to emit light according to the electric potential of a source electrode and the first preset electric potential of the control electrode, and the light emitting control module is connected between the driving transistor and the light emitting device, and is used for controlling the driving transistor and the light emitting device to be connected or disconnected. According to the OLED pixel circuit, the impact of the attenuation of reference voltage signals and the change in threshold voltage on display effect can be avoided.

Description

technical field [0001] The present invention relates to the technical field of liquid crystal display, in particular to an OLED pixel circuit and a driving method thereof, a display panel and a display device. Background technique [0002] The active matrix organic light emitting diode (Active Matrix Organic Light Emitting Diode, hereinafter referred to as AMOLED) display panel uses OLED to emit light of different brightness, so that the pixels corresponding to the OLED display have corresponding brightness; compared with the traditional thin film transistor liquid crystal display panel ( Thin Film Transistor Liquid Crystal Display, hereinafter referred to as TFT LCD), AMOLED display panel has faster response speed, higher contrast ratio and wider viewing angle, which is an important development direction of display panel. [0003] The current that drives OLED to emit light can be expressed by the following formula: [0004] I OLED ...

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Problems solved by technology

[0006] According to the above formula, the driving current for driving the light-emitting device OLED to emit light is related to the threshold voltage Vth of the driving transistor. Voltage attenuation (IR Drop) occurs during the light-emitting phase, which will affect the light-emitting brightness of the light-emitting device OLED, which will adversely affect the display effect of the AMOLED display panel

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