Pixel driving circuit and method, display panel, and display apparatus

Abstract

The invention provides a pixel driving circuit and method, a display panel, and a display apparatus. The pixel driving circuit comprises a driving transistor, a storage capacitor, a turn-on control module, a writing control module and a luminescence control module. The turn-on control module controls the grid of the driving transistor to be connected with the first pole of the driving transistor in a threshold compensation phase and a writing phase to enable threshold voltages of the driving transistor to be written into the storage capacitor. The writing control module controls data voltages to be written into the second pole of the driving transistor in the writing phase. According to the invention, the threshold voltages of the driving transistor and the data voltages on a data line are written into the storage capacitor through the turn-on control module and the writing control module in a step-by-step mode, and it is controlled that driving currents of the driving transistor are irrelevant to the threshold voltages of the driving transistors. Besides, reference voltages are also written into the second end of the storage capacitor through the writing control module in the writing phase, and it is controlled that the driving currents of the driving transistor are irrelevant to unlatching voltages of a luminescent element in a luminescence maintaining phase.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a pixel driving circuit, a method, a display panel and a display device. Background technique [0002] AMOLED (Active Matrix Organic Light Emitting Diode, Active Matrix Organic Light Emitting Diode) can emit light is driven by the current generated by the driving transistor in the saturation state, because when the same gray scale voltage is input, different threshold voltages will generate different driving currents, resulting in current fluctuations. Inconsistency. The uniformity of Vth (threshold voltage of the driving transistor) on the LTPS (low temperature polysilicon) process is very poor, and Vth also drifts, so the brightness uniformity of the traditional 2T1C pixel unit driving circuit has always been poor. Moreover, if the existing pixel driving circuit is used, the driving current of the driving transistor is related to the turn-on voltage of the OLED. Since...

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Problems solved by technology

[0003] The main purpose of the present invention is to provide a pixel driving circuit, method, display panel and display device to solve the problem that the existing technology cannot simultaneously control the driving current of the driving transistor regardless of the threshold voltage of the driving transistor and control the driving current of the driving transistor. The problem of the aging effect of light-emitting components

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