Liquid crystal display device and method for manufacturing the same

• US 8,792,060 B2
• Filed: 08/04/2011
• Issued: 07/29/2014
• Est. Priority Date: 09/20/2010
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Oh, Kum Mi, Park, Jae Hoon, Lee, Han Seok, Shin, Hee Sun, Park, Won Keun
• Primary Examiner(s): Jackson, Jr., Jerome
• Assistant Examiner(s): Fan, Bo
• Application Number:
  US13/198,175
• Publication Number:
  US 20120068200A1
• Time in Patent Office: 1,090 Days
• Field of Search: 445/24, 345/55, 345/198, 345/173, 345/174, 345/214, 345/90, 349/122, 349/12, 257/299.63
• US Class Current: 349/12
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/136227 Through-hole connection of the pixel electrode to the active element through an insulation layer
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/13629 Multilayer wirings
• CPC Class Codes: G02F 1/136295 Materials; Compositions; Manufacture processes
• CPC Class Codes: G02F 2201/40 Arrangements for improving the aperture ratio
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

A liquid crystal display device with a built-in touch screen, which uses a common electrode as a touch-sensing electrode including an intersection of a gate line and a data line to define a pixel region, a bridge line disposed in a central portion of the pixel, an insulating layer formed on the bridge line, a first contact hole disposed through the insulating layer to expose a predetermined portion of an upper surface of the bridge line, a contact metal on the insulating layer and inside the first contact hole, the contact metal electrically connected with the bridge line, a first passivation layer on the contact metal, a second contact hole disposed through the first passivation layer to expose a predetermined portion of an upper surface of the contact metal, a common electrode on the first passivation layer and inside the second contact hole, a conductive line electrically connected with the common electrode, and a second passivation layer on the first passivation layer and the conductive line, wherein the bridge line and the common electrode are electrically connected via the contact metal.

Claims

1. A liquid crystal display device with a built-in touch screen, which uses a common electrode as a touch-sensing electrode, the device comprising:

an intersection of a gate line and a data line to define a multi-domain pixel region;

a bridge line disposed in a central portion of the pixel to block disclination of the multi-domain pixel region, the bridge line being parallel with the gate line;

an insulating layer formed on the bridge line, a first contact hole being disposed through the insulating layer to expose a predetermined portion of an upper surface of the bridge line;

a contact metal on the insulating layer and inside the first contact hole, the contact metal being electrically connected with the bridge line;

a first passivation layer on the contact metal, a second contact hole being disposed through the first passivation layer to expose a predetermined portion of an upper surface of the contact metal;

a common electrode on the first passivation layer and inside the second contact hole;

a conductive line electrically connected with the common electrode; and

a second passivation layer on the first passivation layer and the conductive line,

wherein the bridge line and the common electrode are electrically connected via the contact metal.

2. The liquid crystal display device according to claim 1, wherein a first contact portion between the bridge line and the contact metal is at least partially overlapped with a second contact portion between the contact metal and the common electrode.

3. The liquid crystal display device according to claim 2, wherein the first and second contact portions are overlapped with the bridge line.

4. The liquid crystal display device according to claim 2, wherein the first contact portion is overlapped with one side of the gate metal, and the second contact portion is overlapped with the other side of the gate metal.

5. The liquid crystal display device according to claim 1, wherein the first contact portion between the gate metal and the contact metal is not overlapped with the second contact portion between the contact metal and the common electrode.

6. The liquid crystal display device according to claim 2, wherein an aperture ratio in the pixels with the first contact portion and the second contact portion is about 90% or more as compared to that of the neighboring pixels.

7. The liquid crystal display device according to claim 1, wherein the common electrodes of neighboring pixels in the left and right directions are connected through the bridge line.

8. The liquid crystal display device according to claim 1, wherein the bridge line and the gate line are simultaneously formed on the same layer.

9. The liquid crystal display device according to claim 1, wherein the first contact hole is formed by etching a predetermined portion of the insulating layer corresponding to the bridge line.

10. The liquid crystal display device according to claim 1, wherein the second contact hole is formed by obtained by etching a predetermined portion of the first passivation layer corresponding to the contact metal.