Apparatus for improving liquid crystal panel discharging characteristic

Abstract

The invention discloses a device for improving the discharging characteristic of an LCD (liquid-crystal display) panel. The device includes an input power supply used for providing power supply for a voltage regulation circuit, a first switch circuit used for providing the input power supply for the voltage regulation circuit, a second cutting-off circuit used for providing a cutting-off signal for the first switch circuit, an analog power supply used for providing the analog power supply for a drive circuit of the display, a second switch circuit used for providing the analog power supply for the drive circuit of the display, and a second cutting-off circuit used for providing a cutting-off signal in advance for the second switch circuit. Through the device, the time interval between thecutting-off times of the analog power supply and the input power supply is prolonged, thereby reducing the remaining charges in the panel, reducing the influence caused by pixel recharging during thereboot, and improving the image flicker phenomenon generated during the rapid and repeated reboot.

Description

technical field [0001] The invention relates to a device for improving the discharge characteristics of a liquid crystal panel, in particular to a device for improving the discharge characteristics of a liquid crystal panel when the machine is turned off. Background technique [0002] On some customer systems, when the input signal frequency is 60HZ analog signal, the display screen does not flicker (Power on flicker) when it is turned on for the first time, but if the system is turned on and off quickly (the time interval between on and off is < 2 seconds) ), flickering will occur, the shorter the time interval between power on and off, the more severe the flickering will be, and the longer time interval between power on and off, the flicker will be weakened or even disappear. [0003] The reason for the flicker phenomenon of the liquid crystal display is that after the module power is turned off, since there is no signal on the thin film transistor (TFT) of the panel (P...

AI Technical Summary

Problems solved by technology

During the power-off period, the charge on the pixel mainly depends on the leakage of the transistor, the leakage of the liquid crystal, and the leakage of other materials to discharge the charge on the pixel of the panel. The effect of recharging is that the pixels in the panel cannot reach the required voltage within a certain period of time, so flickering occurs

[0004]At present, the method used to solve the flicker phenomenon is to reduce the discharge resistance of the off-voltage of the thin film transistor. When the discharge resistance of the off-voltage is reduced, the bad flicker phenomenon rate from the original 100% to about 10%, and the degree of flicker is reduced. This method is to change the discharge resistance of the off-voltage of the thin-film transistor so that the off-voltage of the thin-film transistor can be rapidly reduced to 0 volts, to speed up the discharge of the panel, which is also the usual improvement method in the practical application of major liquid crystal module manufacturers, that is, to change the drain discharge speed of the thin film transistor to a certain extent by adjusting the discharge resistance value of the off voltage of the thin film transistor , but a 10% defect rate is unacceptable to module manufacturers and display manufacturers

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