Patent ID: 8749511

Claim:
A liquid crystal display device having a touch screen function comprising: an array substrate having a gate line, a data line, a signal line and a pixel electrode formed thereon, the gate line intersecting the data line to define a pixel region in which the pixel electrode is formed, wherein the signal line is parallel with the data line, the gate line transmits a scan signal to thin film transistors, wherein a same pixel region has a first sensing capacitor and a second sensing capacitor, the pixel electrode overlaps the signal line to form the first sensing capacitor and the pixel electrode also overlaps the gate line to form the second sensing capacitor; the gate line and the signal line are connected to a touch processing section; when the liquid crystal display device is touched, a change of a pixel electrode voltage is resulted, the change of the pixel electrode voltage is reflected on the first sensing capacitor formed on the signal line to cause a small change of voltage on the signal line, the small change of voltage is superimposed on a pulse signal transmitted on the signal line to obtain a voltage signal on the signal line, similarly, the change of the pixel electrode voltage is reflected on the second sensing capacitor formed on the gate line to cause another small change of voltage on the gate line, the another small change of voltage is superimposed on the scan signal transmitted on the gate line to obtain a voltage signal on the gate line; and the touch processing section receives the voltage signal on the signal line and the voltage signal on the gate line and determines the touch position based on the voltage signal on the signal line and the voltage signal on the gate line.