Patent ID: 7379054

Claim:
A touch-control method of an LCD, which is to sense a touch point on an LCD screen of the LCD when a pressure is applied to the LCD screen, the LCD comprising a counter electrode and a substrate having a plurality of data lines and a plurality of scan lines and a plurality of pixels, wherein the scan lines are connected to a gate of a TFT in each respective pixel, and the data lines are connected to a source of the TFT in each respective pixel, the method comprising: a first touch-position sensing step, which detects values of liquid crystal capacitances formed between the scan lines needed to be detected and the counter electrode, respectively, and detects a scan-line-direction touch position according to the values of the liquid crystal capacitances formed between the scan lines needed to be detected and the counter electrode during idling time in-between writing periods, each of the scan lines turning on sequentially to write image data into the LCD screen in the writing periods, wherein a part of the counter electrode corresponding to the pressure is indented, the distance between the part of the counter electrode and scan line is reduced, and the distance between the part of the counter electrode and data line is reduced; a charging step, which charges a voltage signal into each of the data lines needed to be detected after the scan-line-direction touch position is detected; and a second touch-position sensing step, which detects values of liquid crystal capacitances formed between the data lines needed to be detected and the counter electrode, respectively, and detects a data-line-direction touch position according to the values of the liquid crystal capacitances formed between the data lines needed to be detected and the counter electrode after the voltage signal is charged, wherein, the scan-line-direction touch position and the data-line-direction touch position indicate a position of the touch point.