In-cell touch liquid crystal display device and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-2016187695-A1
Application number	US-201514980076-A
Country	US
Kind code	A1
Filing date	Dec 28, 2015
Priority date	Dec 31, 2014
Publication date	Jun 30, 2016
Grant date	—

Abstract

An in-cell touch liquid crystal display device and a method for manufacturing the same are disclosed in which color mixing among pixels can be prevented. The in-cell touch liquid crystal display device includes a thin film transistor (TFT) arranged in a plurality of pixel areas; a source contact layer connected to a source electrode of the TFT and a drain contact layer connected to a drain electrode of the TFT; first and second passivation layers on the source contact layer and the drain contact layer; a common electrode on the second passivation layer; a third passivation layer on the common electrode; a conductive line to overlap the common electrode by passing through the third passivation layer; a fourth passivation layer on the third passivation layer and the conductive line; and a pixel electrode on the fourth passivation layer connected to the drain contact layer in a first contact hole.

First claim

What is claimed is:

1 . An in-cell touch liquid crystal display device, comprising:
a thin film transistor (TFT) arranged in a plurality of pixel areas; a source contact layer connected to a source electrode of the TFT and a drain contact layer connected to a drain electrode of the TFT; first and second passivation layers arranged on the source contact layer and the drain contact layer; a common electrode arranged on the second passivation layer; a third passivation layer arranged on the common electrode; a conductive line arranged to overlap the common electrode by passing through the third passivation layer; a fourth passivation layer arranged on the third passivation layer and the conductive line; and a pixel electrode connected to the drain contact layer in a first contact hole and arranged on the fourth passivation layer.

2 . The in-cell touch liquid crystal display device of claim 1 , wherein the conductive line is arranged in a second contact hole exposing the common electrode by penetrating the third passivation layer and connected with the common electrode.

3 . The in-cell touch liquid crystal display device of claim 2 , wherein the second contact hole and the conductive line are formed in an area overlapped with a data line.

4 . The in-cell touch liquid crystal display device of claim 3 , wherein the data line is arranged in the same layer with the source contact layer and the drain contact layer.

5 . The in-cell touch liquid crystal display device of claim 1 , wherein the fourth passivation layer is arranged between the conductive line and the pixel electrode, and the conductive line and the pixel electrode are spaced apart from each other.

6 . The in-cell touch liquid crystal display device of claim 1 , wherein the first contact hole exposes the drain contact layer by penetrating the first to fourth passivation layer.

7 . A method for manufacturing an in-cell touch liquid crystal display device, the method comprising:
forming a thin film transistor (TFT) in a plurality of pixel areas; forming a source contact layer connected to a source electrode of the TFT and a drain contact layer connected to a drain electrode of the TFT; forming first and second passivation layers on the source contact layer and the drain contact layer; forming a common electrode on the second passivation layer; forming a third passivation layer on the common electrode; forming a second contact hole partially exposing the common electrode; forming a conductive line to be connected with the common electrode; forming a fourth passivation layer on the third passivation layer and the conductive line; forming a first contact hole exposing the drain contact layer; and forming a pixel electrode in the first contact hole and on the fourth passivation layer.

8 . The method of claim 7 , wherein the first to fourth passivation layers corresponding to an area overlapped with the drain contact layer are removed to form the first contact hole, and the third passivation layer corresponding to an area overlapped with the common electrode is removed to form the second contact hole.

9 . The method of claim 8 , wherein forming the conductive line includes arranging the conductive line in the second contact hole to connect with the common electrode.

10 . The method of claim 8 , wherein forming the second contact hole includes forming the second contact hole to overlap with a data line.

11 . The method of claim 10 , wherein forming the conductive line includes forming the conductive line to overlap with the data line.

12 . The method of claim 11 , wherein forming the source contact layer and the drain contact layer including forming a data line in the same layer with the source contact layer and the drain contact layer.

13 . The method of claim 7 , wherein forming a first contact hole exposing the drain contact layer includes forming the first contact hole by penetrating the first to fourth passivation layer.

Assignees

• Lg Display Co Ltd

Inventors

• Cho Yangho
• Kim Youngsik
• Woo Yoonhwan

Classifications

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• G02F1/1362 Primary

  Active matrix addressed cells {(G02F1/134336, G02F1/134363 take precedence)} · CPC title

• G06F2203/04103

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

• G02F1/134309 Primary

  characterised by their geometrical arrangement · CPC title

• G02F1/13338 Primary

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