In cell touch display device and common voltage generating method thereof

摘要

The invention provides an in cell touch display device and a common voltage generating method thereof. The in cell touch display device includes a timing controller and a common voltage generator. The timing controller generates a control signal, divides a time section into a display scanning time section and a touch scanning time section according to the control signal, and divides the touch scanning time section into a touch start time section, a touch execution time section, and a touch end time section sequentially. The common voltage generator raises a common voltage to a first voltage in the touch start time section, provides a periodical pulse signal in the touch execution time section to generate the common voltage, and lowers the common voltage to a second voltage in the touch end time section, so as to improve the efficiency of touch scanning without affecting the efficiency of display scanning.