Display device, pixel driving circuit and driving method of pixel driving circuit

Abstract

The invention discloses a display device, a pixel driving circuit and a driving method of the pixel driving circuit. The pixel driving circuit comprises an organic light-emitting diode, first to fourth switch elements, a storage capacitor and a driving transistor, wherein the first switch element is used for responding to a threshold compensation signal so as to apply a driving voltage and the threshold voltage of the transistor to a first end of the storage capacitor; the second switch element is used for responding to a threshold compensation signal so as to apply the driving voltage to a second end of the storage capacitor; the third switch element is used for responding to a first scanning signal so as to apply a data signal to the second end of the storage capacitor; a grid electrode of the driving transistor is connected with the second end of the storage capacitor, a source electrode of the driving transistor is connected with the driving voltage, and a drain electrode of the driving transistor is connected with the fourth switch element; the fourth switch element is used for responding to a light-emitting control signal so as to apply the driving current output by the drain electrode of the driving transistor to the organic light-emitting diode to emit light. According to the invention, the luminance of the OLED display panel is relatively uniform.

Description

technical field [0001] The present disclosure relates to the field of display technology, and in particular to a pixel driving circuit, a driving method of the pixel driving circuit, and a display device including the pixel driving circuit. Background technique [0002] Compared with the liquid crystal display panel in the traditional technology, the OLED (Organic Light Emitting Diode, Organic Light Emitting Diode) display panel has the characteristics of faster response speed, better color purity and brightness, higher contrast ratio, and wider viewing angle. Therefore, it has gradually received more and more attention from display technology developers. [0003] A pixel unit in an OLED display panel mainly includes an organic light emitting diode and a pixel unit driving circuit for driving the organic light emitting diode. Such as figure 1 As shown in , is a schematic diagram of a 3T1C pixel unit driving circuit in the prior art: it includes a third switching transistor...

AI Technical Summary

Problems solved by technology

[0007] However, due to technical limitations, the uniformity of the threshold voltage Vth is usually poor, and the threshold voltage Vth drift will also occur during use

It can be seen from the above formula that if the Vth of different pixel units is different, there will be differences in the driving current, resulting in uneven display brightness; if the threshold voltage Vth of the driving transistor drifts with time, it may cause different currents in succession and affect the display effect.

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