Signal control circuit and method, LCD and time schedule controller thereof

Abstract

The invention relates to a signal control circuit and a method thereof, a liquid crystal display and a time schedule controller thereof. The signal control circuit provided by the invention maintains voltage level of driving signals output by the time schedule controller which is used for driving a data drive to be supply voltage when the liquid crystal display is switched off, thus leading the data driver to stop outputting to the liquid crystal display and achieving the phenomenon of no skialith, ghost and tide when the liquid crystal display is switched off.

Description

technical field [0001] The present invention relates to a liquid crystal display without residual image, ghost image and tidal phenomenon when shutting down, and in particular to a timing controller and signal control circuit and method of the liquid crystal display. Background technique [0002] Thin Film Transistor Liquid Crystal Display (TFT-LCD for short) has been widely used recently, and replaces cathode ray tube display (Cathode Ray Tube, CRT) to become one of the mainstream displays of the next generation. With the improvement of semiconductor technology, TFT-LCD has the advantages of low power consumption, thin and light weight, high resolution, high color saturation, long life, etc., so it is widely used in computer LCD screens and LCD TVs (LCD TV) and other electronic products closely related to life. [0003] figure 1 It is shown as a block diagram of an existing TFT-LCD driving architecture. figure 2 shown as figure 1 The waveform diagram of the driving wav...

AI Technical Summary

Problems solved by technology

[0005] In addition, since the voltage level of the power supply voltage VDD provided by the power supply unit 107 drops from the high voltage level H to the ground potential GND after the time point B, after the TFT-LCD is turned off, the pixels of the liquid crystal display panel 109 The charge remaining in the array (not shown) will slowly dissipate, and if the driving method adopted by the liquid crystal display panel 109 is a line inversion driving method, the pixel array of the liquid crystal display panel 109 will be Nearly half of the pixels inside will be in a high potential state to dissipate the charge, and this will cause the LCD panel 109 to produce the so-called "shutdown tide phenomenon"

[0006] Therefore, based on the above, it can be seen that if the figure 1 The driving structure of the TFT-LCD is very likely to cause the above-mentioned "shutdown afterimage phenomenon" and "shutdown tidal phenomenon" when it is turned off, and these two phenomena may cause the pixel array of the liquid crystal display panel 109 after a long time. The liquid crystal molecules in the inner pixels are degraded, which will cause the liquid crystal display panel 109 to retain the previous image frame every time a new display image is presented, which is the so-called "ghost image".

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