Liquid crystal display device using in-cell touch mode and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-2016187696-A1
Application number	US-201514980174-A
Country	US
Kind code	A1
Filing date	Dec 28, 2015
Priority date	Dec 30, 2014
Publication date	Jun 30, 2016
Grant date	—

Abstract

A liquid crystal display (LCD) device includes a lower substrate and an upper substrate disposed to face each other and having a liquid crystal layer interposed therebetween, black matrices provided on the lower substrate, a color filter provided between the black matrices, and a common electrode provided on the entire surface of the lower substrate, a gate line and a data line provided on the upper substrate and intersect with each other to define a pixel area, a thin film transistor (TFT) present in the pixel area of the upper substrate, and a pixel electrode electrically in contact with the TFT, wherein a sensing signal is output by detecting a change in self-capacitance between a touch object contacting the upper substrate and the gate line and the data line.

First claim

What is claimed is:

1 . A liquid crystal display (LCD) device, comprising:
a lower substrate and an upper substrate disposed to face each other and having a liquid crystal layer interposed therebetween; black matrices provided on the lower substrate, a color filter provided between the black matrices, and a common electrode provided on the entire surface of the lower substrate; a gate line and a data line provided on the upper substrate and intersect with each other to define a pixel area; a thin film transistor (TFT) present in the pixel area of the upper substrate; and a pixel electrode electrically in contact with the TFT, wherein a sensing signal is output by detecting a change in self-capacitance between a touch object contacting the upper substrate and the gate line and the data line.

2 . The LCD device of claim 1 , wherein the LCD device is an in-cell touch mode LCD device having a TN structure.

3 . The LCD device of claim 1 , wherein the gate line and the data line are used as electrodes of the LCD device in a display section and are used as self-capacitance sensors in a touch section.

4 . The LCD device of claim 1 , wherein the gate line and the data line sense a variation in self-capacitance according to the presence and absence of the touch object on the upper substrate.

5 . A method for manufacturing a liquid crystal display (LCD) device, the method comprising:
providing a lower substrate and an upper substrate disposed to face each other and having a liquid crystal layer provided therebetween; forming a black matrix, a color filter, and a common electrode on the lower substrate; forming a gate line, an active layer, a source/drain electrode, and a data line intersecting with the gate line to form a pixel area on the upper substrate; and forming a pixel electrode electrically in contact with the drain electrode in the pixel area of the upper substrate, wherein a sensing signal is output by detecting a change in self-capacitance between a touch object contacting the upper substrate and the gate line and the data line.

6 . The method of claim 5 , wherein the LCD device may be an in-cell touch mode LCD device having a TN structure.

7 . The method of claim 5 , wherein the gate line and the data line are used as electrodes of the LCD device in a display section and may be used as self-capacitance sensors in a touch section.

8 . The method of claim 5 , wherein the gate line and the data line sense a variation in self-capacitance according to the presence and absence of the touch object on the upper substrate.

Assignees

• Lg Display Co Ltd

Inventors

• Kim Jinseong
• Kim Cheolse
• Kim Juhan
• Kim Sungchul
• Bae Sanghyuck

Classifications

• G06F3/044

  by capacitive means · CPC title

• G02F1/133512

  Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence) · CPC title

• G06F3/041

  Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means · CPC title

• G02F1/13338 Primary

  Input devices, e.g. touch panels · CPC title

• G02F1/136286

  Wiring, e.g. gate line, drain line · CPC title