In-Plane switching mode liquid crystal display device and method for fabricating the same

• US 20040125306A1
• Filed: 12/18/2003
• Published: 07/01/2004
• Est. Priority Date: 12/20/2002
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, Heung-Soo
• Granted Patent: US 7,295,276 B2
• Time in Patent Office: Days
• US Class Current: 349/141
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/13458 Terminal pads

Abstract

An in-plane switching mode liquid crystal display device includes: first and second substrates facing and spaced apart from each other; a gate line on of the first substrate; a gate pad formed at one end of the gate line; a common line parallel to and spaced apart from the gate line; a data line crossing the gate line to define a pixel region; a data pad formed at one end of the data line; a terminal line parallel to and spaced apart from the data line, the terminal line being connected to one end of the common line; a thin film transistor connected to the gate line and the data line; a pixel electrode in the pixel region, the pixel electrode being connected to the thin film transistor; a common electrode connected to the common line; a contact terminal connected to the other end of the common line opposite the terminal line, the contact terminal having an island shape; and a liquid crystal layer between the first and second substrates.

Claims

1. An in-plane switching mode liquid crystal display device, comprising:

first and second substrates facing and spaced apart from each other;

a gate line on the first substrate;

a gate pad formed at one end of the gate line;

a common line parallel to and spaced apart from the gate line;

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

a data pad formed at one end of the data line;

a terminal line parallel to and spaced apart from the data line, the terminal line being connected to one end of the common line;

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

a pixel electrode in the pixel region, the pixel electrode being connected to the thin film transistor;

a common electrode connected to the common line;

a contact terminal connected to the other end of the common line opposite the terminal line, the contact terminal having an island shape; and

a liquid crystal layer between the first and second substrates.

2. The device according to claim 1, wherein the thin film transistor includes a gate electrode, an active layer, and source and drain electrodes, wherein the pixel electrode contacts the drain electrode.

3. The device according to claim 1, wherein the common electrode includes a first common portion over the common line, and second and third common portions extending from the first common portion, wherein the first common portion contacts the common line, the second common portion is formed in a first half of the pixel region, and the third common portion is formed in a second half of the pixel region.

4. The device according to claim 1, wherein the pixel electrode includes a first pixel portion over the gate line, and second and third pixel portions extending from the first pixel portion.

5. The device according to claim 4, wherein the gate line and the first pixel portion form a storage capacitor.

6. The device according to claim 1, wherein the common electrode includes one of indium-tin-oxide (ITO) and indium-zinc-oxide (IZO).

7. The device according to claim 1, wherein the gate line has the same material and is on the same layer as the common line.

8. The device according to claim 1, wherein the terminal line has the same material and is on the same layer as the data line.

9. The device according to claim 1, further comprising:

a gate pad terminal contacting the gate pad;

a data pad terminal contacting the data pad; and

a connection electrode contacting the terminal line and the common line.

10. The device according to claim 1, wherein the contact terminal is on the same layer as the common electrode.

11. A fabricating method of an in-plane switching mode liquid crystal display device, comprising:

forming a gate line and a gate pad on a first substrate, the gate pad formed at one end of the gate line;

forming a common line parallel to and spaced apart from the gate line;

forming a data line crossing the gate line to define a pixel region and a data pad at one end of the data line;

forming a terminal line parallel to and spaced apart from the data line, the terminal line connected to one end of the common line;

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

forming a pixel electrode in the pixel region, the pixel electrode connected to the thin film transistor;

forming a common electrode connected to the common line;

forming a contact terminal connected to the other end of the common line opposite the terminal line, the contact terminal having an island shape;

attaching the first substrate and a second substrate; and

forming a liquid crystal layer between the first and second substrates.

12. The method according to claim 11, wherein the thin film transistor includes a gate electrode, an active layer, and source and drain electrodes, wherein the pixel electrode contacts the drain electrode.

13. The method according to claim 11, wherein the common electrode includes a first common portion over the common line, and second and third common portions extending from the first common portion, wherein the first common portion contacts the common line, the second common portion is formed in a first half of the pixel region, and the third common portion is formed in a second half of the pixel region.

14. The method according to claim 11, wherein the pixel electrode includes a first pixel portion over the gate line, and second and third pixel portions extending from the first pixel portion.

15. The method according to claim 14, wherein the gate line and the first pixel portion form a storage capacitor.

16. The method according to claim 11, wherein the common electrode includes one of indium-tin-oxide (ITO) and indium-zinc-oxide (IZO).

17. The method according to claim 11, wherein the gate line and the common line are formed simultaneously.

18. The method according to claim 11, wherein the terminal line and the data line are formed simultaneously.

19. The method according to claim 11, further comprising:

forming a gate pad terminal contacting the gate pad;

forming a data pad terminal contacting the data pad; and

forming a connection electrode contacting the terminal line and the common line.

20. The method according to claim 11, wherein the contact terminal and the common electrode are formed simultaneously.