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Liquid crystal display and control method thereof

A technology of a liquid crystal display and a control method is applied to the liquid crystal display and its control field that can effectively eliminate residual images, and can solve the problems of white screen at startup, electrode breakdown, excessive voltage, etc.

Active Publication Date: 2010-06-09
HANNSTAR DISPLAY CORPORATION
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  • Abstract
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Problems solved by technology

[0010] Another object of the present invention is to provide a liquid crystal display and its control method, which avoids the action of resetting the XAO signal of the IC and outputs the Vgh voltage at the same time as the gate drive IC, so that the cost of materials can be reduced and the problem of resetting the IC can be solved. There is a problem of white screen when starting up, and the problem of electrode breakdown caused by excessive instantaneous voltage of Vgh is solved

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  • Liquid crystal display and control method thereof

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Embodiment Construction

[0041]The afterimage after power off is mainly due to the difference in the discharge speed of the pixel electrode voltage and the common voltage (Vcom). Causes changes in light transmittance, so the human eye sees afterimages. The present invention uses a timing controller (such as Tcon IC) and a cooperating shutdown switching circuit to make the pixel electrode voltage and common voltage provided to the pixel at the same voltage level during shutdown, so that there is no crossover between the two electrodes of the liquid crystal capacitor. Pressure is generated, which directly achieves the effect of eliminating afterimages.

[0042] image 3 It is a schematic block diagram of the control device of the present invention. As shown in the figure, the control device of the liquid crystal display 33 includes an input interface 30, which provides a voltage source Vdd to the DC power converter 32, so as to convert the power to the internal components. The required operating volta...

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Abstract

The invention discloses a liquid crystal display and a control method thereof. A time schedule controller is used for detecting an external frequency signal of the liquid crystal display, and a switching control signal is output according to the external frequency signal to start a power-off switching circuit, so that the power-off switching circuit controls the output voltages of a gamma voltagegenerator and a common voltage circuit according one of the messages of the switch control signal respectively; thus, the voltage difference between a pixel electrode of a pixel and a common electrode is regulated to reach zero to completely release the pixel loads after the power off so as to realize the aim of instantly eliminating shutdown images.

Description

technical field [0001] The invention relates to a liquid crystal display and a control method thereof, in particular to a liquid crystal display capable of effectively eliminating residual images and a control method thereof. Background technique [0002] Due to its thinness, no radiation, low power consumption, long service life, soft and eye-friendly screen, liquid crystal displays have a high share of use in various application fields. Among them, the active matrix thin film transistor liquid crystal display (TFT-LCD) is the mainstream in the market. [0003] Schematic diagram of a general TFT-LCD drive circuit figure 1 As shown, in the structure of the entire liquid crystal display panel 10, there are a plurality of pixels 11 arranged in a matrix, and each pixel 11 has a thin film transistor (TFT) 12 as a switch, the gate of which is connected to the scanning line 13 in the horizontal direction, and the drain Connected to the data line 14 in the vertical direction, and...

Claims

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Application Information

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IPC IPC(8): G09G3/36
Inventor 方文振曾俊钦林温哲蔡珮琪
Owner HANNSTAR DISPLAY CORPORATION
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