In-cell touch liquid crystal display apparatus and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-2016187693-A1
Application number	US-201514933545-A
Country	US
Kind code	A1
Filing date	Nov 5, 2015
Priority date	Dec 31, 2014
Publication date	Jun 30, 2016
Grant date	—

Abstract

Disclosed are an in-cell touch liquid crystal display (LCD) apparatus having a pixel electrode top structure and a method of manufacturing the same. The in-cell touch LCD apparatus is implemented in the pixel electrode top structure, thereby preventing color mixing between red, green, and blue pixels. The method of manufacturing the in-cell touch LCD apparatus decreases the number of masks necessary to manufacture a TFT array substrate, thereby reducing a manufacturing time and the manufacturing cost.

First claim

What is claimed is:

1 . An in-cell touch liquid crystal display (LCD) apparatus comprising:
a thin film transistor (TFT) disposed in each of a plurality of pixel areas; a source contact part connected to a source electrode of the TFT; a drain contact part connected to a drain electrode of the TFT; first and second passivation layers disposed on the source contact part and the drain contact part; a common electrode disposed on the second passivation layer; a third passivation layer disposed on the common electrode; a conductive line disposed on the third passivation layer and overlapping the common electrode; and a pixel electrode connected to the drain contact part in a first contact hole and disposed on the third passivation layer.

2 . The in-cell touch LCD apparatus of claim 1 , wherein the conductive line is disposed in a second contact hole exposing the common electrode and is connected to the common electrode.

3 . The in-cell LCD apparatus of claim 2 , wherein the second contact hole and the conductive line are disposed in an area overlapping a data line.

4 . A method of manufacturing an in-cell touch liquid crystal display (LCD) apparatus, the method comprising:
forming a thin film transistor (TFT) in each of a plurality of pixel areas; forming a source contact part connected to a source electrode of the TFT, and a drain contact part connected to a drain electrode of the TFT; forming first and second passivation layers on the source contact part and the drain contact part; forming a common electrode on the second passivation layer; forming a third passivation layer on the common electrode; forming a first contact hole, which exposes the drain contact part, and a second contact hole which exposes a portion of the common electrode; forming a conductive line to be connected to the common electrode; and forming a pixel electrode in the first contact hole and on the third passivation layer.

5 . The method of claim 4 , wherein forming the first contact hole and the second contact hole comprises:
removing the first to third passivation layers disposed in an area overlapping the drain contact part to form the first contact hole; and removing the third passivation layer in an area overlapping the common electrode to form the second contact hole.

6 . The method of claim 5 , wherein the conductive line is in the second contact hole and is connected to the common electrode.

7 . The method of claim 5 , wherein the second contact hole and the conductive line to overlap a data line.

Assignees

• Lg Display Co Ltd

Inventors

• Woo Yoon Hwan
• Lee Dong Hyang
• Nam Ji Ho

Classifications

• G02F1/13338 Primary

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

• G02F1/136227

  Through-hole connection of the pixel electrode to the active element through an insulation layer · CPC title

• G02F1/1362

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

• G02F1/136286 Primary

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

• G06F2203/04103

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