Pixel driving circuit, array substrate, display device and pixel driving method

Abstract

The invention discloses a pixel driving circuit, an array substrate, a display device and a pixel driving method. The pixel driving circuit can comprise a driving unit, a switch unit, a threshold voltage compensation module and a luminescent device, wherein the threshold voltage compensation module is respectively connected with a scanning signal wire, a first control wire, a second control wire, a second power supply and a switch unit, the luminescent device is respectively connected with a second power supply and the threshold voltage compensation module, the driving unit is respectively connected with a first power supply and the threshold voltage compensation module, the switch unit is respectively connected with the scanning signal wire and a data signal wire, and the threshold voltage compensation module comprises a threshold voltage maintaining unit, an anti-interference unit, an auxiliary gating unit and a charge and discharge control switch unit. The work current of the luminescent device is irrelevant to the threshold voltage of the driving unit, so the luminescent brightness of the luminescent device is uniform, and further, the luminescent brightness uniformity of the display device is improved.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a pixel driving circuit, an array substrate, a display device and a pixel driving method. Background technique [0002] With the advancement of display technology, more and more Active Matrix Organic Light Emitting Diode (AMOLED) display devices have entered the market. Compared with traditional thin film transistor liquid crystal display devices (Thin Film Transistor Liquid Crystal Display, referred to as: TFT LCD), AMOLED display device has faster response speed, higher contrast ratio and wider viewing angle, so AMOLED display device has been valued by more and more panel manufacturers. [0003] figure 1 It is a schematic structural diagram of an AMOLED pixel driving circuit in the prior art, such as figure 1 As shown, the pixel driving circuit includes a first thin film transistor (Thin Film Transistor, TFT for short) T1, a second thin film transistor T2, a capacito...

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Problems solved by technology

[0004] In the AMOLED pixel drive circuit provided by the prior art, the threshold voltage of T1 will vary with the deviation of the process. After T1 is turned on, the working current of OLED is related to the threshold voltage of T1, and the luminous brightness of OLED is related to the working current. is quite sensitive to changes, so changes in the threshold voltage of T1 will cause considerable changes in the luminance of OLEDs

The threshold voltage will change due to process fluctuations or changes in the temperature of the display device during operation, which will lead to uneven luminance of the display device.

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