Pixel compensation driving circuit, driving method thereof and display device

Abstract

The invention provides a pixel compensation driving circuit. The driving circuit comprises a driving transistor, a first transistor, a second transistor, a third transistor, a fourth transistor, a storage capacitor, a light-emitting element, a first switch, a second switch and a compensation unit, wherein the compensation unit is used for detecting and storing an initial threshold voltage of the driving transistor in each shutdown period of the display device; in this way, the pixel compensation drive circuit can obtain the superimposed data voltage by superimposing the initial threshold voltage and the data voltage output by the data line during the next startup period of the display device. According to the technical scheme, the actual threshold voltage of the driving transistor is compensated, and finally, the current flowing through the light-emitting element is irrelevant to the actual threshold voltage of the driving transistor, so that the problem of uneven display of the display device caused by drifting of the actual threshold voltage of the driving transistor is solved, and the display effect of a picture is improved. The invention further provides a driving method of thepixel compensation driving circuit and a display device comprising the pixel compensation driving circuit.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a pixel compensation driving circuit, a driving method thereof, and a display device. Background technique [0002] Organic light emitting diode (OLED) display device is a display device that uses organic light-emitting materials to generate light by carrier injection and recombination under the drive of an electric field. It has self-luminescence, wide viewing angle, high contrast, and low power consumption Advantages such as electricity and high response speed. [0003] However, due to the limitations of the manufacturing process, there are certain differences in the electrical characteristics of the driving transistors of each pixel in the existing OLED display devices, and the driving transistors are unstable during operation and are easily affected by factors such as temperature and light. The characteristic drift occurs, and both the spatial electrical characteris...

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Problems solved by technology

[0004] Therefore, it is necessary to provide a pixel compensation driving circuit, its driving method, and a display device to solve the problem of uneven display in existing OLED display devices

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