LCD device with data/gate line pad electrodes and contact electrode including both a transparent conductive film and a metal layer interconnecting data link and data line through respective contact holes

• US 7,626,669 B2
• Filed: 06/29/2005
• Issued: 12/01/2009
• Est. Priority Date: 12/04/2004
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Lim, Joo Soo, Kim, Woong Sik
• Primary Examiner(s): HEYMAN, JOHN S
• Application Number:
  US11/168,315
• Publication Number:
  US 20060119771A1
• Time in Patent Office: 1,616 Days
• Field of Search: 349/114, 349/149, 349/153
• US Class Current: 349/149
• CPC Class Codes: G02F 1/133555 Transflectors
• CPC Class Codes: G02F 1/13458 Terminal pads
• CPC Class Codes: G02F 1/136227 Through-hole connection of the pixel electrode to the active element through an insulation layer

Abstract

The present invention relates to a transflective thin film transistor substrate and method of fabricating the same that is adaptive for simplifying its process. The liquid crystal display device includes: first and second substrates; a gate line on the first substrate; a gate insulating film on the first substrate; a data line crossing the gate line to define a pixel area; a thin film transistor connected to the gate line and the data line; an organic insulating film on the gate line, the data line and the thin film transistor, and having a transmission hole in the pixel area; a pixel electrode on the organic insulating film of the pixel area via the transmission hole and connected to the thin film transistor; and a reflective electrode on the pixel electrode having a same edge part as the pixel electrode or an edge part located at inner side from an edge part of the pixel electrode and exposing the pixel electrode of the transmission hole.

Claims

1. A liquid crystal display device, comprising:

first and second substrates;

a gate line on the first substrate;

a gate insulating film on the first substrate;

a data line crossing the gate line to define a pixel area;

a thin film transistor connected to the gate line and the data line;

an organic insulating film on the gate line, the data line and the thin film transistor, and having a transmission hole in the pixel area;

a pixel electrode on the organic insulating film of the pixel area and in the transmission hole and connected to the thin film transistor;

a reflective electrode on the pixel electrode having a same edge part as the pixel electrode or an edge part located at inner side from an edge part of the pixel electrode and exposing the pixel electrode of the transmission hole,

wherein a source electrode is connected to the data line and a drain electrode is connected to the pixel electrode, and the organic insulating film, which is a single layer, contacts with the source electrode, the drain electrode and the pixel electrode,

a pad connected to at least one of the gate line and data line;

a lower pad electrode connected to at least one of the gate line and data line;

a contact hole passing through the organic insulating film and the gate insulating film to expose the lower pad electrode;

an upper pad electrode connected to the lower pad electrode via the contact hole;

a data link extended from the lower pad electrode and adjacent to the data line;

a plurality of contact holes exposing the data link and the data line; and

a contact electrode passing through the contact holes to connect to the data link and the data line, and including a transparent conductive film same as the pixel electrode and a reflective metal layer same as the reflective electrode.

2. The liquid crystal display device according to claim 1, wherein the organic insulating film and the pixel electrode have an embossed surface.

3. The liquid crystal display device according to claim 2, wherein the reflective electrode has the same embossed surface.

4. The liquid crystal display device according to claim 1, wherein the reflective electrode is connected to the pixel electrode and encloses a lateral surface of the transmission hole.

5. The liquid crystal display device according to claim 1, wherein the transmission hole passes through the organic insulating film and the gate insulating film.

6. The liquid crystal display device according to claim 1, wherein the pixel electrode is connected to a drain electrode of the thin film transistor via a drain contact hole passing through the organic insulating film.

7. The liquid crystal display device according to claim 1, wherein the reflective electrode and the pixel electrode overlap at least one of the gate line and the data line.

8. The liquid crystal display device according to claim 1, further comprising:

a storage capacitor including a storage line, the storage line crossing the data line; and

a drain electrode, wherein the storage line is overlapped with the drain electrode extended from the thin film transistor with the gate insulating film therebetween.

9. The liquid crystal display device according to claim 1, further comprising a semiconductor pattern overlapped with the data line and the thin film transistor.

10. The liquid crystal display device according to claim 1, wherein the reflective metal layer is formed to have the same edge part as the transparent conductive film or to have an edge part located at an inner part from the edge part of the transparent conductive film.

11. The liquid crystal display device according to claim 1, wherein the contact electrode is located at an area to be sealed by a sealant.

12. The liquid crystal display device according to claim 1, wherein the pad is one of a gate pad and a data pad.

13. The liquid crystal display device according to claim 1, further comprising a liquid crystal layer between the first and second substrates.