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

Patent metadata

Field	Value
Publication number	US-2016187690-A1
Application number	US-201514933498-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 to overlap the common electrode; a pixel electrode connected to the drain contact part in a first contact hole and disposed on the third passivation layer; and a bridge contact part including a first side directly contacting the conductive line and a second side connected to the common electrode through the third passivation layer.

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

3 . The in-cell touch LCD apparatus of claim 1 , wherein the conductive line and the first side of the bridge contact part 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 conductive line in an area, overlapping the common electrode, on the third passivation layer; forming a first contact hole, which exposes the drain contact part, and forming a pixel electrode in the first contact hole and on the third passivation layer; and forming a bridge contact part, a first side of the bridge contact part directly contacting the conductive line, and a second side of the bridge contact part being connected to the common electrode through the third passivation layer.

5 . The method of claim 4 , further comprising forming a second contact hole by removing the third passivation layer disposed in an area overlapping the common electrode,
wherein the forming of the first contact hole comprises forming the first contact hole by removing the first to third passivation layers disposed in an area overlapping the drain contact part.

6 . The method of claim 5 , wherein the second side of the bridge contact part is disposed in the second contact hole, and the bridge contact part is connected to the common electrode.

7 . The method of claim 4 , wherein,
the pixel electrode and the bridge contact part are formed in a manufacturing process using the same material and the same mask, and the bridge contact part is formed in an island pattern and does not contact the pixel electrode.

Assignees

• Lg Display Co Ltd

Inventors

• Nam Ji Ho
• Woo Yoon Hwan

Classifications

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G02F1/1368 Primary

  in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)} · CPC title

• 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

• G06F2203/04103

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