Level shifter for array substrate gate driving circuit

Abstract

The invention provides a level shifter for an array substrate gate driving circuit. The level shifter comprises a first input end, a second input end, a third input end, a fourth input end, an output end, a first resistor and a second resistor; the first input end receives a logic control signal; the second input end receives a reference voltage; one end of the first resistor receives a first voltage, and the third input end is connected to the other end of the first resistor so as to receive the voltage from the first resistor; one end of the second resistor receives a second voltage, and the fourth input end is connected to the other end of the second resistor so as to receive the voltage from the second resistor; the output end alternatively outputs the voltage received by the third input end and the voltage received by the fourth input end according to the logic control signal and the reference voltage. According to the level shifter, variable resistors are additionally arranged to control the slope of output voltage variation of the output end, a level shifter output current ripple is reduced, and meanwhile the effect of reducing electromagnetic interference is achieved.

Description

technical field [0001] The present invention generally relates to the technical field of liquid crystal display, and more specifically, relates to a level shifter used in an array substrate gate drive circuit. Background technique [0002] Gate Driver On Array (GOA) technology is a technology that manufactures the gate scanning drive circuit of thin film transistor (ThinFilm Transistor, TFT) on the array substrate to replace the driver chip made of external silicon chips. The gate voltage of each row of TFTs in the liquid crystal display can be provided by a GOA circuit. In the GOA circuit, a level shifter (LevelShifter) is generally used to generate a clock control signal to control each row of TFTs to be turned on or off. [0003] Existing level conversion circuits for GOA architecture liquid crystal displays usually include: a timing controller located on the circuit driver board, which is used to generate and send logic control signals (LogicControl); a timing controller...

AI Technical Summary

Problems solved by technology

[0004] At present, the difference between the maximum voltage and the minimum voltage of several voltages used in the GOA circuit will be 35V or even greater during the process of high and low changes. Then, the level shifter can easily cause voltage changes during the voltage change process. Too fast, the ripple of the output current of the level shifter is too large, resulting in worse output electromagnetic interference (EMI) effect

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