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. Source lines underlying a current VCOM electrode are divided into n groups. A first voltage is applied at the current VCOM electrode in a conversion phase of each sensing period. A second voltage is applied at each group of the source lines underlying the current VCOM electrode in a manner such that no net charge being contributed to the VCOM electrode by the underlying source lines, thereby parasitic capacitors associated with the current VCOM electrode having no effect on touch sensing result.

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; dividing source lines underlying a current VCOM electrode into n groups, where n is an integer greater than 1; applying a first voltage VA at the current VCOM electrode in a conversion phase of each sensing period; and applying a second voltage VB at each group of the source lines underlying the current VCOM electrode in a manner such that no net charge being contributed to the VCOM electrode by the underlying source lines, thereby parasitic capacitors associated with the current VCOM electrode having no effect on touch sensing result.