Circuit for eliminating shutdown afterimage of liquid crystal display device and liquid crystal display device using same

Abstract

The invention discloses a circuit for eliminating a shutdown afterimage of a liquid crystal display device and the liquid crystal display device using same. The circuit comprises a controller, a voltage detecting circuit, a voltage output circuit, a power supply management chip, a gate electrode driving chip and a TFT. The drain electrode of the TFT is connected with the input end of the voltage detecting circuit. The output end of the voltage detecting circuit is connected with the input end of the controller. The output end of the controller is connected with the first input end of the voltage output circuit. The second input end of the voltage output circuit is connected with the power supply management chip. The output end of the voltage output circuit is connected with the second input end of the gate electrode driving chip. The power supply management chip is connected with the first input end of the gate electrode driving chip. The output end of the gate electrode driving chip is connected with the gate electrode of the TFT. The voltage detecting circuit detects the drain electrode voltage of the TFT and outputs different detecting signals to the controller according to the magnitude of the drain electrode voltage. The controller makes the voltage output circuit generate different gate electrode starting voltages. Furthermore when the liquid crystal display device is shut down, the controller outputs the gate electrode starting voltage to the gate electrode of the TFT.

Description

technical field [0001] The invention relates to the technical field of liquid crystal display, in particular to a circuit for eliminating the afterimage of a liquid crystal display after shutdown and a liquid crystal display. Background technique [0002] Liquid crystal display (Liquid Crystal Display, LCD) is playing an increasingly important role in today's life, among which thin film transistor liquid crystal display (ThinFilmTransistorLCD, TFT-LCD) is a kind of use thin film transistor (ThinFilmTransistor, TFT) to generate voltage to control liquid crystal molecules In the turned display, liquid crystal molecules are sandwiched between the upper and lower conductive glass substrates to form a liquid crystal capacitor. However, due to the presence of liquid crystal capacitors and storage capacitors inside the TFT, it is difficult for the voltage at the drain terminal of the TFT to become 0 volts in a short period of time when the liquid crystal display is turned off, and ...

AI Technical Summary

Problems solved by technology

However, when the TFT-LCD is turned off, the drain voltages of different TFTs may be different. If the gates of all TFTs are applied with the same gate open voltage, the discharge current at the drain terminals of some TFTs will be too large, so that TFT burned out

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