LCD device public voltage source and its electric charge recovery system

Abstract

The invention provides a public voltage source applied to a liquid crystal display and a charge recovery system. The charge recovery system comprises the public voltage source, a control unit and a source cathode driving circuit, wherein, before the public voltage source switches the output level of the public voltage source, the control unit controls the public voltage source so as to lead a voltage driving circuit in the public voltage source to be broken with an output end, a charge recovery start signal is output to the source cathode driving circuit so as to adjust the level of source cathode voltage output by the source cathode driving circuit, by increasing or decreasing the level of the source cathode voltage, the charge stored in the liquid crystal cell of the liquid crystal display is recycled to the public voltage source, thus achieving the aim of increasing the charge use efficiency of the liquid crystal display and reducing consumed power.

Description

technical field [0001] The invention relates to a power supply mechanism, in particular to a common voltage source applied to a liquid crystal display and a related charge recovery system. Background technique [0002] Generally speaking, a liquid crystal display includes a plurality of liquid crystal display units (LCD cells) arranged in a matrix. figure 1 It is a schematic diagram showing the connection relationship between the conventional liquid crystal unit 10 and the gate drive circuit 12 , the common voltage source 14 and the source drive circuit 16 of the liquid crystal display. When the common voltage source 14 switches the output common voltage level V COM Or the source voltage level V of the source drive circuit 16 switching output SOURCE , the parasitic capacitance C in the liquid crystal display unit 10 P , storage capacitor C S , Parallel plate capacitance C lcd Along with charging or discharging, when the gate drive circuit 12 outputs a gate drive signal ...

AI Technical Summary

Problems solved by technology

[0004] However, stored in capacitor C P 、C S 、C lcd The charges in the liquid crystal unit 10 will naturally discharge and disappear along the discharge path after the display of the liquid crystal unit 10 is completed. These charges are not fully utilized, so that the charge usage efficiency of the liquid crystal display cannot be improved, so that the problem of power consumption cannot be improved.

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