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Drive method for reducing torsion type and ultra-torsion type LCD device reaction time

A technology of liquid crystal display and driving method, applied in static indicators, instruments, etc., can solve the problems of liquid crystal capacitor charge leakage, liquid crystal capacitor unable to maintain a fixed level, unable to liquid crystal storage capacitor charge lock, etc.

Inactive Publication Date: 2008-07-30
SITRONIX TECH CORP
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Problems solved by technology

[0009] Because the passive matrix liquid crystal display (TN type and STN type) is a passive structure, there is no switching element in each pixel, and the charge after charging the liquid crystal storage capacitor cannot be locked, so when the data electrode outputs the voltage, the liquid crystal capacitor The charge in the capacitor will leak through the stray capacitance (Cgd) or its charging path, so the liquid crystal capacitor cannot maintain a fixed level. Therefore, after the data electrode is charged for one frame time, the real effective potential of the liquid crystal pixel capacitor will be higher than the output of the data electrode. Much smaller, resulting in the phenomenon of blurring the edge of the dynamic picture (Blurring)

Method used

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  • Drive method for reducing torsion type and ultra-torsion type LCD device reaction time
  • Drive method for reducing torsion type and ultra-torsion type LCD device reaction time
  • Drive method for reducing torsion type and ultra-torsion type LCD device reaction time

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Embodiment Construction

[0025] According to the detailed content and technical description of the present invention, examples are used for further description. However, it should be understood that these examples are for illustrative purposes only, and should not be construed as limitations on the implementation of the present invention.

[0026] The driving method used in passive matrix liquid crystal displays such as twisted nematic (TN) and super twisted nematic (STN). The data (Segment) of the driving device is based on the digital red, green, blue (RGB) Different output grayscale voltages are converted according to the data of the three primary colors (corresponding to the brightness of a certain grayscale optically). Because twisted nematic (TN) and super twisted nematic (STN) only have two states of black and white, and the gray scale is generated by pulse width modulation (PulseWidth Modulation; PWM) within one scanning line (1 line). ) to distinguish. see image 3 Shown is a schematic diag...

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Abstract

The invention provides a drive method for reducing the response time of twisted and super-twisted LCDs. According to the method, the data of different dynamic frames pass through a dynamic frame determination mechanism behind an input tricolor data bus of red, green and blue. Overdrive compensation potentials higher or lower than prior output potential are given flexibly N times within the time for each data bus to be updated. In this way, liquid crystal is rotated to reach the expected object brightness within a shorter time, thus significantly improving the problem of blurred images caused by too slow response of passive matrix-type LCDs of twisted nematic type (TN), super-twisted nematic type (STN) and so on.

Description

technical field [0001] A driving technology for a passive matrix liquid crystal display, especially a passive matrix liquid crystal display (LCD) for twisted linear (TN) and super twisted linear (STN), which can effectively shorten the liquid crystal response time and improve Motion picture blurring (Blurring) phenomenon. Background technique [0002] Due to the thin, light and small characteristics of liquid crystal displays and lower power consumption than traditional CRT displays, liquid crystal displays have gradually replaced CRT displays in recent years. [0003] Liquid crystal flat panel displays can be divided into passive matrix type (PM-LCD) and active matrix type (AM-LCD) according to the display driving method. The driving method of PM-LCD is to set the transparent ITO (Indium Tin Oxide) electrodes in the column (X) direction on one panel on the upper and lower glass panels, and set the transparent ITO electrodes in the row (Y) direction on the other panel. Aft...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36G09G3/20G02F1/133
Inventor 郑世明许槐益
Owner SITRONIX TECH CORP
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