Patent ID: 9317152
Filing Date: 2016-04-19
CPC Classification: G06F

Claim Text:
1. A method of driving a display device including an integrated in-cell self-capacitive touch panel, the method comprising: applying a plurality of sampling voltages to a plurality of common electrodes of the integrated in-cell self-capacitive touch panel via a plurality of lines connected to the plurality of common electrodes, each of the plurality of sampling voltages applied to the plurality of common electrodes via the plurality of lines that are each connected to a corresponding one of the plurality of common electrodes; receiving noise signals from the plurality of common electrodes via the plurality of lines to which the sampling voltages are applied, each noise signal received from a corresponding one of the plurality of common electrodes via one of the plurality of lines that is connected to the corresponding one of the plurality of common electrodes; determining a plurality of noise levels based on the received noise signals, each of the plurality of noise levels associated with a corresponding one of the plurality of sampling voltages; comparing the plurality of noise levels to a threshold level; selecting a sampling voltage from the plurality of sampling voltages to use as a touch driving voltage based on the comparison of the plurality of noise levels to the threshold level; applying a common voltage to all the common electrodes of the display device via the plurality of lines while the display device is driven in a time sharing method during a display period of a display frame of the integrated in-cell self-capacitive touch panel; and applying the selected sampling voltage as the touch driving voltage to the plurality of the common electrodes via the plurality of lines while the display device is driven in the time sharing method during a touch driving period of the display frame, wherein the touch driving period does not overlap with the display period of the display frame and wherein during the display period of the display frame the selected sampling voltage is not applied to any of the common electrodes of the display device; wherein the plurality of common electrodes of the integrated in-cell self-capacitive touch panel are used for both displaying an image during the display period of the display frame and sensing touch of the integrated in-cell self-capacitive touch panel during the touch driving period of the display frame.