LIQUID CRYSTAL DISPLAY DEVICE HAVING TOUCH SENSOR EMBEDDED THEREIN, METHOD OF DRIVING THE SAME AND METHOD OF FABRICATING THE SAME

摘要

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.

主权项

1. A method of fabricating a touch sensor embedded liquid crystal display device, comprising the steps of:
forming a gate metal pattern including gate electrodes of a pixel thin film transistor and first and second sensor thin film transistors on a substrate together with a gate line, a common line and first and second sensor gate lines; forming a common electrode connected to the common line; forming a gate insulating layer on the substrate having the gate metal pattern and the common electrode formed thereon; forming semiconductor layers of the pixel and first and second sensor thin film transistors on the gate insulating layer, respectively; forming a data metal pattern including source and drain electrodes of the pixel and first and second sensor thin film transistors on the gate insulating layer having the semiconductor layers formed thereon together with a data line, a power line and a readout line; forming a passivation layer to cover the data metal pattern; forming a plurality of contact holes in the passivation layer; forming a pixel electrode on the passivation layer to be connected to the drain electrode of the pixel thin film transistor via the contact hole to form a horizontal electric field with the common electrode; and forming a sensing electrode together with the gate line, the common electrode, or the pixel electrode.