Pixel driving circuit, driving method thereof, and display substrate

Abstract

The invention discloses a pixel driving circuit, a driving method thereof and a display substrate, and belongs to the display technical field. The pixel driving circuit includes a signal generating sub-circuit, a data writing sub-circuit and a comparison sub-circuit. Since the comparator circuit can output driving signals having different duty cycles to the gates of the driving transistors by comparing the voltage of the reference signal output to it by the signal generator circuit and the voltage of the data signal output to it by the data writing subcircuit, the comparator circuit can outputdriving signals having different duty cycles to the gates of the driving transistors. Therefore, not only can the driving transistor output the driving current to the light emitting unit under the control of the driving signal, but also the light emitting unit can be driven to emit light. Moreover, by adjusting the voltage of the data signal, the comparator circuit outputs driving signals with different duty cycles to the driving transistor, thereby realizing the adjustment of the working time of the driving transistor, and further realizing the linear adjustment of the luminance of the lightemitting unit. The pixel driving circuit adjusts the luminance of the light emitting unit in a richer manner and has higher flexibility.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a pixel driving circuit, a driving method thereof, and a display substrate. Background technique [0002] With the development of display technology, organic light emitting diode (OLED), as a current-mode light-emitting device, has been increasingly used for its self-luminescence, fast response and wide viewing angle. high-performance display panel. In an OLED display panel, each pixel unit generally includes an OLED device and a pixel driving circuit for driving the OLED device. [0003] In the related art, a pixel driving circuit may generally include a switching transistor, a driving transistor and a capacitor, that is, the pixel driving circuit may have a 2T1C structure. Wherein, the switching transistor can write a data signal into the gate of the driving transistor, and the driving transistor can output a driving current to the OLED device under the drive of the data sig...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a pixel driving circuit, its driving method, and a display substrate, which can solve the problem in the related art that when adjusting the luminance of an OLED device, the adjustment method is relatively simple. The technical solution is as follows:

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