Level processing circuit, gate drive circuit and display device

Abstract

The embodiment of the invention provides a level processing circuit, a gate drive circuit and a display device, relates to the technical field of display, and can solve the problem that an LPS cross grain phenomenon occurs in the display device when the display device is shut down in a low-temperature environment. A level processing circuit comprises a voltage detection circuit, a switch selectioncircuit and an XAO circuit. The voltage detection circuit is configured to output a high level to the switch selection circuit if the first voltage is greater than or equal to the second voltage andoutput a low level to the switch selection circuit if the first voltage is smaller than the second voltage. The switch selection circuit comprises a first switch and a second switch which are connected in parallel. The second switch comprises a first sub-switch and a first resistor which are connected in series. The switch selection circuit is configured as follows: if the voltage detection circuit outputs a high level, the first switch is turned on, and the high level is output to the XAO circuit, if the voltage detection circuit outputs a low level, the first sub-switch is turned on, and thelow level is output to the XAO circuit.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a level processing circuit, a gate driving circuit and a display device. Background technique [0002] At present, when testing products with high refresh rate and high resolution, for example, at a temperature of -5° C., the display device is turned on and off every 3 seconds. [0003] In a low-temperature environment, due to changes in parameters such as the reverse turn-off time and reverse turn-off voltage of the parasitic diode of the thin film transistor, the liquid crystal equivalent capacitance C of the display device LC and storage capacitor C S The residual charge cannot be released through the thin film transistor in a short time, and will slowly accumulate over time, thus showing the limit power sequence (Limit Power Sequence, referred to as LPS) stripes ( figure 1 )The phenomenon. That is, the performance of the thin film transistor included in the sub-pi...

AI Technical Summary

Problems solved by technology

[0003] In a low-temperature environment, due to changes in parameters such as the reverse turn-off time and reverse turn-off voltage of the parasitic diode of the thin film transistor, the liquid crystal equivalent capacitance C of the display device LC and storage capacitor C S The residual charge cannot be released through the thin film transistor in a short time, and will slowly accumulate over time, thus showing the limit power sequence (Limit Power Sequence, referred to as LPS) stripes ( figure 1 )The phenomenon

That is, the performance of the thin film transistor included in the sub-pixel deteriorates in a low-temperature environment, and the electron mobility deteriorates correspondingly, so that different degrees of residual charges occur in different positions of the display screen, which in turn causes LPS stripes to appear on the display screen of the display device.

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