Delay device for analog power supply signal

Abstract

The invention discloses an analog power supply signal retarding device, which comprises following components: an analog power supply, which is used for providing analog power supply to a display drive circuit; a first switch circuit, which is connected between the analog power supply and the display drive circuit and used for retarding the analog power supply and providing the retarded analog power supply to the display drive circuit; a second switch circuit, which is connected with the first switch circuit and used for providing a retarding signal to the first switch circuit; a retarding circuit, which is connected with the second switch circuit and used for providing retarding time to the second switch circuit; a logic power supply, which is connected with the retarding circuit and usedfor providing power supply to the retarding circuit. The analog power supply signal retarding device can lessen the residue electric charge in the panel, reduce the influence that is generated by pixel recharging during machine restarting, and improve the picture flicker phenomenon that appears during quick and repeated machine starting and stopping.

Description

technical field [0001] The invention relates to an analog power signal delay device, in particular to a device for analog power signal delay when starting up. 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 (Panel), the pixels in the panel retain the charge of the last picture driving the panel. During t...

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. The degree is reduced. This method is to change the discharge resistance of the turn-off voltage of the thin-film transistor, so that the turn-off voltage of the thin-film transistor can be quickly increased to 0 volts when it is turned off, and the discharge of the panel is accelerated. The usual improvement method in practical applications 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 the 10% defective rate is caused by neither the module manufacturer nor the display manufacturer. acceptable

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