Patent US 9,201,261

A liquid crystal display device having a touch sensor embedded therein is disclosed. The present invention includes a liquid crystal layer between first and second substrates, a pixel on the second substrate to apply a horizontal electric field to the liquid crystal layer, a touch sensor on the second substrate, the touch sensor detecting a touch by forming a touch capacitor with a touch object for touching the first substrate, and a readout line outputting a sensing signal from the touch sensor. The touch sensor includes a sensing electrode on the second substrate to form the sensing capacitor with the touch object, first and second sensor gate lines, a first sensor thin film transistor supplying a sensing driving voltage to the sensing electrode in response to a control of the first sensor gate line, and a second sensor thin film transistor supplying electric charges of the sensing electrode as the sensing signal in response to a control of the second sensor gate line.