Patent ID: 8842227

Claim:
A liquid crystal display device, comprising: a first substrate; a second substrate; a gate line and a data line on the first substrate to define a pixel region; a pixel transistor formed at the intersection of the gate line and the data line; a pixel electrode formed in the pixel region; a first storage capacitor connected to the pixel electrode; a switching line formed on the first substrate; a read out line formed on the first substrate; a second storage capacitor formed on the first substrate, directly connected to the switching line, the second storage capacitor including: a first protrusion pattern directly protruding from the switching line; a gate insulating film directly contacting the first protrusion pattern; and a data metal pattern directly contacting the gate insulating film; a switching transistor, including: a gate electrode connected to the second storage capacitor; a drain electrode connected to the read out line; and a source electrode connected to a driving voltage line; a first column spacer formed on the second substrate; and a common electrode formed on the first column spacer forming a sensing capacitor between the common electrode and an end of the second storage capacitor, the sensing capacitor including a passivation film directly contacting the data metal pattern, wherein the second storage capacitor and the sensing capacitor are connected in series between the switching line and the common electrode.