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 touch sensor embedded liquid crystal display device comprising:
a liquid crystal layer between first and second substrates; a pixel provided for each pixel area of the second substrate to apply a horizontal electric field to the liquid crystal layer in the pixel area using a pixel electrode supplied with a data signal via a thin film transistor connected to a gate line and a data line and a common electrode connected to a common line; a touch sensor provided for each space between one group of pixels and another group of pixels on the second substrate, the touch sensor detecting a touch by forming a sensing capacitor with a touch object for touching the first substrate; and a readout line outputting a sensing signal from the touch sensor, wherein the touch sensor comprises:
a sensing electrode provided to 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, anda 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, wherein;
the first and second sensor gate lines are connected respectively to the first and second sensor thin film transistor, are separated from the gate line connected to the thin film transistor of the pixel, and are driven independently from the gate line,the first sensor thin film transistor is connected to the second sensor thin film transistor through the sensing electrode,the sensing electrode directly forms the sensing capacitor with the touch object, the sensing electrode being one electrode of the sensing capacitor and the touch object being the other electrode of the sensing capacitor, anda length of the sensing electrode corresponds to a sum of widths of the pixels included in the one group.