Liquid crystal display and its compensating feed through voltage method

A liquid crystal display and liquid crystal capacitor technology, applied in static indicators, instruments, transistors, etc., can solve the problems of affecting liquid crystal molecules, reducing potential, affecting the light transmission rate and brightness of liquid crystal display 100, and achieving the effect of reducing flickering phenomenon.

Inactive Publication Date: 2007-06-27
INNOCOM TECH SHENZHEN +1
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AI Technical Summary

Problems solved by technology

Due to the feedthrough voltage generated by the feedthrough effect, the potential of the drain electrode 1233 decreases, that is, the potential of the pixel electrode 124 decreases, so that the voltage between the pixel electrode 124 and the common electrode 125 will be lower than the required pixel voltage, and Affect the deflection of liquid crystal molecules, and further affect the light transmission rate and brightness of the liquid crystal display 100
Therefore, due to the influence of the feedthrough effect, before and after the thin film transistor 123 is turned off, the liquid crystal display 100 has different light transmittance and brightness, that is, a flicker phenomenon occurs, thereby affecting the image quality of the liquid crystal display 100

Method used

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  • Liquid crystal display and its compensating feed through voltage method
  • Liquid crystal display and its compensating feed through voltage method
  • Liquid crystal display and its compensating feed through voltage method

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Embodiment Construction

[0021] Please refer to FIG. 3 , which is a schematic diagram of the first preferred embodiment of the liquid crystal display of the present invention. The liquid crystal display 200 includes a gate driver 211, a source driver 212, a plurality of gate lines 221 and a plurality of data lines 222, and the plurality of gate lines 221 are insulated and intersected with the plurality of data lines 222 to define a plurality of pixel units 230. Each pixel unit 230 includes a thin film transistor 223, a pixel electrode 224, a common electrode 225 and a storage capacitor 228, the pixel electrode 224 and the common electrode 225 form a liquid crystal capacitor 227, and the storage capacitor 228 is connected in parallel with the liquid crystal capacitor 227 . The TFT 223 includes a gate 2231 connected to the gate driver 211 through the gate line 221, a source 2232 connected to the source driver 212 through the data line 222 and a drain 2233 connected to the pixel electrode 224 .

[002...

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Abstract

The invention relates to liquid crystal display (LCD). Each pixel unit of the LCD includes a thin film transistor (TFT), a common electrode, and a pixel electrode. The pixel unit and the common electrode form a liquid crystal capacitance. TFT includes a grid, a source electrode, and a drain electrode connected to a pixel electrode. Voltage compensation unit including a comparator is connected to the above circuit. When voltage is loaded to the liquid crystal capacitance, the comparator compares potential of source electrode of TFT in time period from starting up time to closing time with potential of drain electrode after TFT shuts down, and then outputs signal of compensation voltage in order to compensate feed through voltage of TFT. The disclosed LCD can lower twinkling caused by feed through effect. The invention also discloses method for compensating feed through voltage of LCD.

Description

【Technical field】 [0001] The invention relates to a liquid crystal display and a method for compensating feed through (Feed Through) voltage thereof. 【Background technique】 [0002] A liquid crystal display generally includes an upper substrate, a lower substrate, and a liquid crystal layer sandwiched between the upper substrate and the lower substrate. Moreover, there are multiple pixel units in the liquid crystal display, each pixel unit includes a pixel electrode and a common electrode, the pixel electrode and the common electrode form a liquid crystal capacitor, and the voltage between the pixel electrode and the common electrode is called a pixel voltage. The deflection direction of the liquid crystal molecules will change with the voltage applied between the pixel electrode and the common electrode, so as to control the light transmission rate through the liquid crystal layer, and then control the brightness of each pixel unit of the liquid crystal display. [0003] A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/136G02F1/133G09G3/36H01L29/786
Inventor 许义忠苏威瑀
Owner INNOCOM TECH SHENZHEN
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