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

Patent metadata

Field	Value
Publication number	US-9715137-B2
Application number	US-201514980174-A
Country	US
Kind code	B2
Filing date	Dec 28, 2015
Priority date	Dec 30, 2014
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

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, and
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.

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 sense a variation in self-capacitance according to the presence and absence of the touch object on the upper substrate.

4. 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, and
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.

5. The method of claim 4 , wherein the LCD device is an in-cell touch mode LCD device having a TN structure.

6. The method of claim 4 , 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

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G02F1/13338 Primary

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

• G06F3/044

  by capacitive means · CPC title

• G06F2203/04103

  Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices · CPC title

• G02F1/136286

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