Patent ID: 9218779
Filing Date: 2015-12-22
Classification: G06F,G09G

Abstract:
1. A method of driving a liquid crystal display (LCD) device, the method comprising: transferring, by a stage corresponding to each of a plurality of gate lines, a pull-up signal to a corresponding gate line formed in an in-cell touch panel during an image output period in one frame and, after the pull-up signal is outputted during the image output period, turning on a first pull-down transistor or a second pull-down transistor to transfer a pull-down signal to the gate line; and detecting, by a touch sensing unit, a touch by using a touch electrode formed in the in-cell touch panel while the stage turns on the first pull-down transistor and the second pull-down transistor to transfer the pull-down signal to the corresponding gate line, during a touch sensing period in the one frame, wherein, the stages sequentially transfer the pull-up signal to the respective gate lines; and wherein a polarity of a first driving voltage transferred to the first pull-down transistor differs from a polarity of a second driving voltage transferred to the second pull-down transistor, during the image output period, and the polarity of the first driving voltage transferred to the first pull-down transistor is the same as the polarity of the second driving voltage transferred to the second pull-down transistor, during the touch sensing period.