Compensation circuit and display device

Abstract

The invention discloses a compensation circuit and a display device. The compensation circuit comprises a first switching tube receiving a first reference voltage, a second switching tube receiving asecond reference voltage, a pre-charging unit, a charging unit and a pull-down unit. A second access terminal of the first switching tube is connected with a second access terminal of the second switching tube to provide an output signal; the first switching tube and the second switching tube are in conduction alternately with frame switching; and phases of the first reference voltage and the second reference voltage are opposite. The pre-charging unit enables one of the first switching tube and the second switching tube to be in conduction according to a pre-stage gate drive signal; the charging unit maintains the conduction or turning-off state of the first switching tube or the second switching tube according to a local-stage gate drive signal; and the pull-down unit controls the firstswitching tube and the second switching tube according to a post-stage gate drive signal. Because transistors in the compensation circuit work alternately, the threshold voltage drifts of the transistors can be reduced and recovery of the threshold voltage drifts of the transistors is realized.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a compensation circuit and a display device. Background technique [0002] A liquid crystal display device is a display device that uses the phenomenon that the alignment direction of liquid crystal molecules changes under the action of an electric field to change the light transmittance of a light source. Due to the advantages of good display quality, small size and low power consumption, liquid crystal display devices have been widely used in mobile terminals such as mobile phones and large-sized display panels such as flat-panel televisions. Most of the liquid crystal displays currently on the market are projection type liquid crystal displays, which include a liquid crystal panel and a backlight module. The working principle of the liquid crystal panel is to place liquid crystal molecules between two parallel glass substrates, and apply a driving voltage on the two ...

AI Technical Summary

Problems solved by technology

These methods can achieve the purpose of prolonging the life of the integrated gate drive circuit to a certain extent, but because the pull-down switch tube is often under unipolar (positive voltage) bias, it will be subjected to a long period of positive DC voltage stress or Pulse voltage stress, the threshold voltage drift of the pull-down switch tube is still very large after a long time of work, and the conductivity will decline, which will seriously affect the working life of the integrated gate drive circuit

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