Pixel driving circuit, driving method thereof, display panel and display device

Abstract

The invention provides a pixel driving circuit, a driving method thereof, a display panel and a display device. The pixel driving circuit comprises a driving transistor, a first storage capacitor, a second storage capacitor, a threshold compensating unit, a data write-in unit and a light emitting control unit. The threshold compensating unit makes the driving transistor be conducted in a threshold compensating period for realizing electric discharging to a resetting voltage line until the driving transistor is switched off. The data write-in unit makes data voltage be written into the gate of the driving transistor in each data write-in period. The light emitting control unit makes the driving transistor be conducted in a light emitting period for driving a light emitting element emit light. The total charge amount of the first storage capacitor is equal to the total charge amount of the second storage capacitor in the threshold compensation period and the data write-in period. The charge amount of the first storage capacitor in the data write-in period is equal to the charge amount of the first storage capacitor in a light emitting control period. The pixel driving circuit can realize different compression ratios of the data and enlarges data driving range of a driving integrated circuit.

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] At present, in the field of AMOLED (Active-matrix organic light emitting diode, active matrix organic light-emitting diode) display, especially in the design of large-size substrates, due to the inhomogeneity of the backplane TFT characteristics in the process and stability problems, the flow through the OLED (OrganicLight-EmittingDiode, Organic Light-Emitting Diode) The unevenness of the current. In order to compensate for the TFT unevenness caused by the backplane production process, resulting in VthShift (threshold voltage drift), and the drift of TFT characteristics caused by the long-term turn-on bias, the AMOLED compensation circuit design is carried out. Aiming at the trend of increasing the size of AMOLED, the signal line load will be increased, resulting in vo...

AI Technical Summary

Problems solved by technology

[0004] 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 different compression ratios of data cannot be realized in the prior art, thereby improving the data driving range of the driving IC

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