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Control device and method for eliminating ghost on panels of liquid crystal

A technology of liquid crystal panels and control devices, applied to instruments, static indicators, etc., can solve problems such as delaying shutdown time and accelerating afterimage elimination

Inactive Publication Date: 2003-10-08
WINBOND ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Traditionally, the user uses the software to command to turn off the panel first, and then turn off the power after the control device consumes the charge in the capacitor. This method does not actually accelerate the elimination of afterimages and delays the shutdown time.

Method used

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  • Control device and method for eliminating ghost on panels of liquid crystal
  • Control device and method for eliminating ghost on panels of liquid crystal
  • Control device and method for eliminating ghost on panels of liquid crystal

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Embodiment Construction

[0024] In order to make the above-mentioned and other objects, features and advantages of the present invention more obvious, a preferred embodiment is specifically cited below, together with the accompanying drawings, and described in detail as follows:

[0025] After the LCD panel is turned off, the residual image is caused because the electric charge of the steady-state capacitor cannot be eliminated quickly, so the present invention utilizes a detection power supply (V DD Downward) detection circuit and a discharge circuit that provides a rapid discharge path to solve the problem of image sticking.

[0026] Please refer to figure 1 , the figure shows a block diagram of an afterimage elimination control device according to an embodiment of the present invention, which is suitable for an LCD panel, such as an STN (Super Twist Nematic, super twist type) liquid crystal panel, which includes: a detection circuit 1, a comparator 3. A control circuit 5 and a discharge circuit 1...

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Abstract

A liquid crystal panel residual image elliminating control device includes a detection circuit, a comparator, a control circuit and a discharge circuit electrically connected orderly. It's method includes the following steps: firstly, the detection circuit detects the start signals, the comparator compares the reference voltage and the earthing voltage to detect the switching-off operation of the supply voltage drop. When the reference voltage is lower than the earthing voltage, the control circuit drives the discharge circuit to release charge in steady-state capacitance in LCD panel to get the aim of eliminating residual image.

Description

technical field [0001] The invention relates to a liquid crystal panel control device and method, in particular to a liquid crystal panel residual image elimination control device and method, which are suitable for obtaining better visual effects when the LCD power supply is turned off. Background technique [0002] In a liquid crystal panel control circuit, such as a Super Twist Nematic (STN) liquid crystal panel, a voltage generating circuit generates a driving voltage (for example: V 1 , V 2 , V 3 , V 4 and V 5 ), and using the supply voltage (V DD ), V 1 , V 2 , V 3 , V 4 and V 5 The voltage changes at different times cause the liquid crystal to produce different changes in brightness and darkness to display different information. Such as diagram 2-1 The shown basic timing diagram of conventional LCD panel driving, for the sake of simplification, only shows the timing diagram of a single pixel (pixel) during positive driving and negative driving. In the figure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36
Inventor 林志儒李仲平黄云朋
Owner WINBOND ELECTRONICS CORP