Level generating circuit of display device

Abstract

The invention discloses a level generating circuit of a display device. The level generating circuit comprises a power supply module, a first reference voltage generating module, a second reference voltage generating module, a driving voltage generating module and a first capacitor, wherein the power supply module is used for generating first power supply voltage and second power supply voltage; the first reference voltage generating module is used for generating first reference voltage according to the second power supply voltage; the second reference voltage generating module is used for generating second reference voltage according to the first power supply voltage; the driving voltage generating module is used for generating first driving voltage and second driving voltage according tothe first power supply voltage, and the first driving voltage and the second driving voltage provide working voltage needed by a post-stage circuit; the first capacitor is connected between the output end of the first reference voltage generating module and the output end of the second reference voltage generating module, so that the first reference voltage is smaller than the second reference voltage. According to the level generating circuit disclosed by the invention, the normal operation of the post-stage circuit can be guaranteed.

Description

technical field [0001] The present invention relates to the technical field of liquid crystal display, and more specifically, relates to a level generating circuit of TFT liquid crystal display. Background technique [0002] TFT-LCD (Amorphous Silicon Thin Film Transistor Liquid Crystal Display Panel) is more and more widely used in daily life due to its mature technology, and further attention has been paid to the stability of the driving voltage of the LCD. In the actual test, the turn-on voltage VGH of the thin film transistor loses power too quickly or slowly during the power-down process, which will cause the downstream circuit to fail to work normally. During the power-off process, the turn-on voltage VGH of the thin-film transistor drops too quickly, resulting in an under-voltage lockout, and the power supply cannot provide the working voltage required by the subsequent stage circuit, causing the latter stage circuit to fail to work normally. During the power-off pro...

AI Technical Summary

Problems solved by technology

When the input voltage is lower than a certain value, the chip does not work and is in a protection state: and when some chips with protection functions cannot meet their own requirements in the power-on sequence, the self-protection of the components will cause the subsequent circuit to fail to work normally.

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