Liquid crystal display device and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-9720295-B2
Application number	US-201213627589-A
Country	US
Kind code	B2
Filing date	Sep 26, 2012
Priority date	Sep 27, 2011
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

Disclosed are an LCD device and a method of manufacturing the same, in which a passivation layer and a pixel electrode are simultaneously formed by a single mask process using a half tone mask, and thus, manufacturing efficiency increases, and a defective contact due to loss of the pixel electrode can be prevented in a pad area. The LCD device includes a pad part including a pad area and a contact area. The LCD device includes a pixel pad formed in the pad area, a pixel bar formed in the contact area, and a bridge layer contacting the pixel pad with the pixel bar. The bridge layer is formed as a single layer or multi layers, and formed of one or more of a transparent conductive material and an opaque conductive material.

First claim

What is claimed is:

1. A liquid crystal display (LCD) device, comprising:
an active area with a plurality of pixels;
an inactive area comprising a pad part including a pad area and a contact area;
a first passivation layer in the pad area and the contact area, and having a first contact hole in the pad area;
a pixel pad formed in the first contact hole;
a pixel bar formed in the contact area and separated from the pixel pad; and
a bridge on the first passivation layer in the contact area, the bridge extending to the first contact hole and connecting the pixel bar to the pixel pad; and
a second passivation layer on the first passivation layer, and having a second contact hole in the pixel bar exposing a portion of the bridge on the first passivation layer and a third contact hole exposing another portion of the bridge in the first contact hole.

2. The LCD device of claim 1 , wherein the pad part comprises a unit on-off pad part, a unit FPC pad/unit FPC shorting connection part, and a bump input dummy/bump output dummy part.

3. The LCD device of claim 1 , further comprising a pixel electrode contacting the bridge via the third contact hole.

4. The LCD device of claim 3 , wherein the bridge comprises a lower metal connected to the pixel pad in the first contact hole, and
wherein the pixel electrode contacts the lower metal via the third contact hole.

5. The LCD device of claim 4 , wherein the lower metal is disposed on the first passivation layer in the contact area.

6. The LCD device of claim 5 , wherein the bridge further comprises a contact pattern on the second passivation layer and contacting the lower metal via the second contact hole.

7. The LCD device of claim 6 , wherein the contact pattern extends to the pad area and contacts the lower metal via the third contact hole.

8. The LCD device of claim 1 , further comprising a pixel electrode on the second passivation layer in the contact area,
wherein the pixel electrode contacts the bridge via the second contact hole.

9. The LCD device of claim 8 , wherein:
the pixels include a common electrode,
the bridge comprises a contact pattern on the first passivation layer in the contact area, the contact pattern extending to the first contact hole, and
the contact pattern is formed of a same transparent conductive material on a same underlying layer as the common electrode.

10. The LCD device of claim 8 , wherein the bridge comprises:
a contact pattern on the first passivation layer in the contact area, the contact pattern extending to the first contact hole; and
a lower metal on the contact pattern in the contact area.

11. The LCD device of claim 10 , wherein the second contact hole exposes the lower metal, and
wherein the pixel electrode contacts the lower metal via the second contact hole.

12. The LCD device of claim 1 , wherein the second passivation layer has at least one other contact hole in the pixel bar in addition to the second contact hole to further expose the bridge.

13. The LCD device of claim 1 , wherein the pixels include a transparent common electrode, and
wherein the bridge comprises a same transparent conductive material on a same underlying layer as the common electrode.

14. The LCD device of claim 1 , wherein the first contact hole has a larger area than the bridge in the first contact hole in plan view, and
wherein the bridge has a larger area than the third contact hole in plan view.

Assignees

• Lg Display Co Ltd

Inventors

• Jung Young Ki
• Yu Jae Sung
• Song In Hyuk
• Park Jae Hoon
• Lee Han Seok

Classifications

• H10W20/081

  by forming openings in the dielectric parts · CPC title

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• G02F1/13458

  Terminal pads · 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