Liquid crystal display device and method of fabricating the same

• US 7,732,814 B2
• Filed: 06/20/2006
• Issued: 06/08/2010
• Est. Priority Date: 10/18/2005
• Status: Expired due to Fees

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Nam, Sung-Lim, Lee, Na-Kyung
• Primary Examiner(s): Fahmy; Wael
• Assistant Examiner(s): ARMAND, MARC ANTHONY
• Application Number:
  US11/455,688
• Publication Number:
  US 20070085079A1
• Time in Patent Office: 1,449 Days
• Field of Search: 257/59, 257/72, 257/83, 257/257, 257/290, 257/351, 257/368, 257/392, 257/E27.132, 257/E27.1, 257/E31.097, 257/E29.117, 349/155, 349/156
• US Class Current: 257/59
• CPC Class Codes: G02F 1/133707 Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
• CPC Class Codes: G02F 1/13394 spacers regularly patterned on the cell subtrate, e.g. walls, pillars G02F1/133377 takes precedence
• CPC Class Codes: H01L 27/1214 comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
• CPC Class Codes: H01L 27/124 with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits wiring structures per se H01L23/52
• CPC Class Codes: H01L 27/1288 employing particular masking sequences or specially adapted masks, e.g. half-tone mask

Abstract

A liquid crystal display (LCD) device includes a gate line and a data line crossing each other to define a pixel region on a first substrate, a thin film transistor connected to the gate line and the data line, a first protrusion and a second protrusion formed on the first substrate, a pixel electrode connected to the thin film transistor in the pixel region, a first patterned spacer and a second patterned spacer formed on a second substrate facing the first substrate, wherein the first patterned spacer corresponds to the first protrusion, and the second patterned spacer corresponds to the second protrusion.

Claims

1. A liquid crystal display (LCD) device, comprising:

a first substrate and a second substrate facing each other and having a liquid crystal layer interposed therebetween;

a gate line and a data line crossing each other to define a pixel region on the first substrate;

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

a first protrusion and a second protrusion formed on the first substrate;

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

a first patterned spacer and a second patterned spacer formed on the second substrate, wherein the first patterned spacer corresponds to the first protrusion and the second patterned spacer corresponds to the second protrusion,

wherein the first protrusion has a first height and the second protrusion has a second height such that the first height is greater than the second height,

wherein the first patterned spacer and the second patterned spacer have substantially a same height, such that the first patterned spacer contacts the first protrusion and the second patterned spacer is separated from the second protrusion,

wherein the thin film transistor includes a gate electrode extending from the gate line, a gate insulating layer on the gate electrode, a semiconductor layer including an active layer and an ohmic contact layer on the gate insulating layer, and source and drain electrodes spaced apart from each other on the semiconductor layer,

wherein the first protrusion includes a first layer, a second layer and a third layer such that the first layer is formed of a same layer as the active layer, the second layer is formed of a same layer as the ohmic contact layer, and the third layer is formed of a same layer as the source and drain electrodes,

wherein the gate line has a first portion with a first width corresponding to the first and second protrusions and a second portion with a second width, the first width being greater than the second width, and wherein the second protrusion includes a single layer of a same layer as the active layer.

2. The LCD device according to claim 1, wherein the second patterned spacer is separated from the second protrusion by a gap less than about 0.3 μ

m.

3. The LCD device according to claim 1, wherein the first protrusion includes a triple-layered structure, and the second protrusion includes a single-layered structure.

4. The LCD device according to claim 1, wherein the first and second protrusions are arranged over the gate line.

5. The LCD device according to claim 1, further comprising a black matrix formed between the second substrate and the first patterned spacer and between the second substrate and the second patterned spacer, the black matrix corresponding to the gate and data lines.

6. The LCD device according to claim 1, further comprising a color filter layer formed between the second substrate and the first and second patterned spacers.

7. The LCD device according to claim 1, further comprising a common electrode on the first substrate, the common electrode being spaced apart from the pixel electrode.

8. The LCD device according to claim 1, wherein the data line includes a first layer, a second layer and a third layer such that the first layer is formed of a same layer as the active layer, the second layer is formed of a same layer as the ohmic contact layer, and the third is formed of a same layer as the source and drain electrodes.

9. The LCD device according to claim 5, further comprising a color filter layer formed between the black matrix and the first patterned spacer and between the black matrix and the second patterned spacer.

10. The LCD device according to claim 9, further comprising a common electrode formed between the color filter layer and the first patterned spacer and between the color filter layer the second patterned spacer.

11. The LCD device according to claim 10, further comprising an overcoat layer formed between the color filter layer and the common electrode.