IN-CELL TOUCH SCREEN AND A METHOD OF DRIVING THE SAME

摘要

The present invention is directed to a method of driving an in-cell touch screen. In one embodiment, adjacent common voltage (VCOM) electrodes, a source line and/or a gate line is set high-impedance, such that an equivalent capacitor is not possessed by the current VCOM electrode. In another embodiment, a gate line is set high-impedance in the touch sensing mode. A voltage waveform of the current VCOM electrode is applied to adjacent VCOM electrodes abutting the current VCOM electrode and/or to a source line, such that an equivalent capacitor has no effect on the current VCOM electrode.

主权项

1. A method of driving an in-cell touch screen, comprising:
providing a touch screen with a common voltage (VCOM) layer divided into VCOM electrodes which act as sensing points in a touch sensing mode; and setting adjacent VCOM electrodes abutting a current VCOM electrode, a source line underlying the current VCOM electrode, and/or a gate line underlying the current VCOM electrode high-impedance in the touch sensing mode, such that an equivalent capacitor is not possessed by the current VCOM electrode, thereby substantially reducing a load at the sensing point.