Patent ID: 9417721
Filing Date: 2016-08-16
CPC Classification: G06F

Claim Text:
1. A TFT touch display device, comprising: a plurality of control lines distributed along a first direction; a plurality of sensor lines distributed along a second direction substantially perpendicular to the first direction; a plurality of TFTs, each TFT being disposed at an intersection of one of the plurality of control line and one of the plurality of sensor line, wherein each TFT is connected to the control line, the sensor line, and a power source providing a fixed voltage, such that the TFT is turned on to generate a back-channel current when there is an object approaching to the TFT; a control unit connected to the plurality of control lines for respectively providing a control signal to the plurality of control lines; a current sensing unit connected to the plurality of sensor lines for respectively sensing the back-channel current generated by the TFTs in a sensing period; and a plurality of display pixels, each display pixel corresponding to one of the plurality of TFTs, each display pixel having a liquid crystal capacitor; wherein the control signal is a signal with floating voltage in the sensing period, and the floating voltage represents that there is no voltage applied to a gate of the TFT.