AMOLED pixel driving circuit and pixel driving method

Abstract

The invention provides an AMOLED pixel driving circuit and a pixel driving method. The pixel driving circuit comprises a first transistor, a second transistor, a third transistor, a fourth transistor,a fifth transistor, a sixth transistor, a first storage capacitor, a second storage capacitor and a light-emitting diode which are connected with a first voltage end, a second voltage end, a light-emitting control signal, a reset signal end, a data input end, a scanning signal end and a reset voltage end correspondingly; the pixel driving method comprises an initialization step, a threshold valuestorage step, a data writing-in step and a light emitting step. According to the AMOLED pixel driving circuit and the pixel driving method provided by the invention, the influences of threshold voltage on light emission is compensated by correcting the data voltage, meanwhile, the display nonuniformity caused by IR voltage drop is avoided, the picture display quality is improved, moreover, through resetting of an OLED, the anode of the OLED is at a relatively low electric potential under a black picture, ghost appearing on the picture is avoided, in addition, the darkness of the black pictureis improved, and thus high-quality image display is provided.

Description

technical field [0001] The invention relates to the technical field of pixel driving of OLED or other organic electroluminescent devices, in particular to an AMOLED pixel driving circuit and a pixel driving method. Background technique [0002] With the development of information-oriented society, various performance requirements in the display field are constantly increasing. Therefore, it is necessary to study various flat-panel display devices that are thin, light and have low power consumption. For example, flat-panel display devices are classified as liquid crystal displays. (LCD) equipment, plasma display panel (PDP) equipment, active matrix organic light emitting diode (OLED) equipment, etc. [0003] Among OLED display devices, AMOLED (Active Matrix / Organic Light Emitting Diode, Active Matrix Organic Light Emitting Diode) has the advantages of thinner and lighter, self-illumination, low radiation, high contrast, fast response and low energy consumption. It is widely ...

AI Technical Summary

Problems solved by technology

[0004] One of the main problems that AMOLED needs to overcome is that the backplane needs to be driven by a low-temperature polysilicon thin-film transistor (LTPS TFT) circuit, and the uneven threshold value of the thin-film transistor TFT and the IR drop of the power line will cause the display color difference (Mura ) or uneven brightness and inconsistent brightness, the current AMOLED pixel drive circuit cannot compensate the threshold voltage VTH and IR drop IR Drop, and cannot guarantee the darkness of the black screen, making it difficult to provide high-quality screen display

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