In-plane switching mode liquid crystal display device and method of fabricating the same

• US 7,177,001 B2
• Filed: 04/15/2004
• Issued: 02/13/2007
• Est. Priority Date: 12/11/2003
• Status: Expired due to Fees

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Lee, Yun-Bok
• Primary Examiner(s): Nguyen; Dung T.
• Application Number:
  US10/824,612
• Publication Number:
  US 20050128406A1
• Time in Patent Office: 1,034 Days
• Field of Search: 349/141, 349/143, 349/129
• US Class Current: 349/141
• CPC Class Codes: G02F 1/133757 with different alignment orientations
• 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 1/136213 Storage capacitors associated with the pixel electrode
• CPC Class Codes: G02F 2201/122 having a particular pattern
• CPC Class Codes: G02F 2201/52 RGB geometrical arrangements

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 the first substrate; a data line crossing the gate line to define a pixel region including a plurality of domains; a thin film transistor connected to the gate line and the data line; a common line parallel to and spaced apart from the gate line; a common electrode extending from the common line and having a ring shape; a pixel electrode connected to the thin film transistor and having a ring shape, the pixel electrode alternating with the common electrode; and a liquid crystal layer between the pixel electrode and the second substrate, the liquid crystal layer in neighboring domains having orientation directions different from each other.

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 data line crossing the gate line to define a pixel region including a plurality of domains;

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

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

a common electrode extending from the common line and having a ring shape;

a pixel electrode connected to the thin film transistor and having a ring shape, the pixel electrode alternating with the common electrode;

a liquid crystal layer between the pixel electrode and the second substrate, the liquid crystal layer in neighboring domains having orientation directions different from each other,

a first capacitor electrode connected to the thin film transistor;

a second capacitor electrode overlapping the common electrode; and

a pixel connecting line combining the first and second capacitor electrodes.

2. The device of claim 1, wherein the first capacitor electrode, the second capacitor electrode, the pixel connecting line and the pixel electrode are formed of the same material and the same layer.

3. The device of claim 1, wherein the pixel region is divided into first to fourth domains by the common electrode and the pixel connecting line.

4. The device of claim 3, wherein first and second orientation directions of the liquid crystal layer in neighboring two domains are substantially perpendicular to each other.

5. The device of claim 4, wherein the first orientation direction is one of 0°

direction and 45°

direction with respect to a direction parallel to the gate line, and the second orientation direction is one of 90°

direction and 135°

direction.

6. The device of claim 5, further comprising a first polarizing plate outside the first substrate and a second polarizing plate outside the second substrate, wherein the first polarizing plate has a first direction of 90°

to 270° and

the second polarizing plate has a second direction of 0°

to 180°

.

7. The device of claim 1, wherein the liquid crystal layer is oriented using one of a rubbing method, a photo-orientation method, a plasma method, an ion beam method and an electron beam method.

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

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

forming a gate line on a first substrate;

forming a data line crossing the gate line to define a pixel region including a plurality of domains;

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

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

forming a common electrode extending from the common line and having a ring shape;

forming a pixel electrode connected to the thin film transistor and having a ring shape, the pixel electrode alternating with the common electrode;

forming a first capacitor electrode connected to the thin film transistor, a second capacitor electrode overlapping the common electrode and a pixel connecting line combining the first and second capacitor electrodes;

attaching the first substrate and a second substrate such that the first substrate faces and is spaced apart from the second substrate;

forming a liquid layer between the first and second substrates; and

orientating the liquid crystal layer in neighboring domains to have orientation directions different from each other.