Grid drive circuit, liquid crystal display device and electronic device

A technology of gate drive circuit and liquid crystal display device, which is applied to static indicators, instruments, etc., and can solve problems such as image color shift and current drive capability reduction

Inactive Publication Date: 2007-10-03
TPO DISPLAY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this design, when the liquid crystal panel is normally displayed, the VEE used as the off voltage must be transmitted to the gate drive circuit 12 through the resistor 194, which will reduce t...

Method used

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  • Grid drive circuit, liquid crystal display device and electronic device
  • Grid drive circuit, liquid crystal display device and electronic device
  • Grid drive circuit, liquid crystal display device and electronic device

Examples

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Embodiment Construction

[0031] FIG. 2 is a schematic diagram of an embodiment of a gate driving circuit according to the present invention. A plurality of shift registers are included in the gate driving circuit 61 , and only three shift registers are used for illustration in this embodiment, which is not intended to limit the present invention. The control unit 213 is used to output a control signal Dreset. In this embodiment, when the liquid crystal panel is turned on, the control signal Dreset is logic low level, and when the liquid crystal panel is turned off, the control signal Dreset is logic high level. The NAND gate 204 has two input terminals respectively coupled to the first shift register 201 and the second shift register 202 . The NAND gate 204 is coupled to the input terminal of the inverter 210 through the selection unit 215a. The selection unit 215a is controlled by a control signal Dreset, so that the inverter 210 receives a voltage signal of a logic low level. The selection unit 21...

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PUM

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Abstract

The present invention relates to a grid drive circuit. It includes first shift register for outputting first signal, second shift register for outputting second signal, NAND gate, first switch device, second switch device, control unit and inverter. The NAND gate has two input ends which are respectively coupled with first signal and second signal. The input end of the first switch device is coupled with output end of NAND gate, the output end of second switch device is coupled with output end of first switch device, its input end is coupled with high voltage level. The control unit can output control signal, and is coupled with first switch device and second switch device. The input end of said inverter is coupled with output end of second switch device, and the output end of said inverter can output grid drive signal.

Description

technical field [0001] The invention relates to a gate drive circuit, in particular to a gate drive circuit which can solve the problem of afterimage after shutdown. Background technique [0002] After the LCD screen is turned off, if the driving circuit design of the LCD screen is not good, there may be image afterimages, which will have a negative impact on the LCD screen in the long run. FIG. 1 is a schematic diagram of a known liquid crystal panel used to solve the residual image after shutdown of the liquid crystal screen. In FIG. 1 , the TFT array 10 is controlled by a gate driving circuit 12 and a data driving circuit 11 , and in order to solve the problem of image sticking after power-off, the gate driving circuit 12 is coupled to a control circuit 15 to eliminate the problem of image sticking after power-off. In the control circuit 15, the voltage VDD output by the voltage converter 14 is used to charge the capacitor 106 when the LCD screen is turned on. When the L...

Claims

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Application Information

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IPC IPC(8): G09G3/36G09G3/20G02F1/133
Inventor 柯宏浜罗平
Owner TPO DISPLAY
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