Vertically aligned mode liquid crystal display with differentiated B cell gap

• US 20060215081A1
• Filed: 05/31/2006
• Published: 09/28/2006
• Est. Priority Date: 07/12/2001
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Park, Seung-Beom, Lyu, Jae-Jin, Song, Jang-Kun, Choi, Yong-Woo, Kim, Kyeong-Hyeon, Lee, Seung-Hee
• Granted Patent: US 7,605,886 B2
• Time in Patent Office: Days
• US Class Current: 349/107
• 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 1/134336 Matrix
• CPC Class Codes: G02F 1/136213 Storage capacitors associated with the pixel electrode
• CPC Class Codes: G02F 1/1393 the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells G02F1/1396, G02F1/141 take precedence
• CPC Class Codes: G02F 2201/121 common or background

Abstract

A thin film transistor array substrate is provided with a gate line assembly, a data line assembly, and thin film transistors. The data line assembly crosses over the gate line assembly while defining pixel regions. A pixel electrode is formed at each pixel region. A color filter substrate is provided with a black matrix, and color filters of red, green and blue are formed at the black matrix at the pixel regions. An overcoat layer covers the color filters, and a common electrode is formed on the overcoat layer with an opening pattern. The thin film transistor array substrate, and the color filter substrates face each other, and a liquid crystal material is injected between the thin film transistor array substrate, and the color filter substrate. The blue color filter has a thickness smaller than the red color filter or the green color filter such that the liquid crystal cell gap at the blue color filter is larger than the liquid crystal cell gap at the red or green color filter.

Claims

1. A liquid crystal display comprising:

a first insulating substrate;

a first wiring line assembly formed on the first insulating substrate with a plurality of first wiring lines;

a second wiring line assembly crossing over the first wiring line assembly with a plurality of second wiring lines while defining pixel regions, the second wiring line assembly being insulated from the first wiring line assembly;

a pixel electrode formed at each pixel region with a first opening pattern;

a thin film transistor connected to the first wiring line assembly, the second wiring line assembly, and the pixel electrode;

a first domain dividing member form on the first insulating substrate;

a second insulating substrate facing the first insulating substrate;

color filters of red, green and blue formed on the second insulating substrate;

a common electrode formed on the second insulating substrate with the color filters;

a second domain dividing member formed on the second insulating substrate; and

a liquid crystal layer sandwiched between the first and the second insulating substrates with liquid crystal molecules, the liquid crystal molecules of the liquid crystal layer being vertically aligned with respect to the first and the second substrates when no electric field is applied between the pixel electrode and the common electrode;

wherein a B cell gap is differentiated from an R cell gap or a G cell gap, the R cell gap indicates the thickness of the liquid crystal layer at the region of the red color filter, the G cell gap indicates the thickness of the liquid crystal layer at the region of the green color filter, and the B cell gap indicates the thickness of the liquid crystal layer at the region of the blue color filter, wherein the B cell gap, the R cell gap and the G cell gap are differentiated from each other by;

R cell gap−

G cell gap<

G cell gap−

B cell gap, and wherein the first and the second opening patterns partition the pixel region into a plurality of micro-domains.

2. The liquid crystal display of claim 1 wherein the B cell gap is established to be smaller than the R cell gap or the G cell gap by 0.2±

0.15 μ

m.

12. The liquid crystal display of claim 1, further comprising a first polarizing plate and a second polarizing plate respectively attached to the first insulating substrate and the second insulating substrate.

13. The liquid crystal display of claim 12, wherein the polarizing axes of the first and second polarizing plates are inclined with respect to long sides of the micro-domains by 45°

.

3-4. -4. (canceled)

7-8. -8. (canceled)

9. A process of manufacturing a liquid crystal display, comprising the steps of:

forming a first insulating substrate;

forming a first wiring line assembly with a plurality of first wiring lines on the first insulating substrate;

forming a second wiring line assembly with a plurality of second wiring lines crossing over the first wiring line assembly while defining pixel regions, the second wiring line assembly being insulated from the first wiring line assembly;

forming a pixel electrode at each pixel region;

forming a first domain dividing member on the first insulating substrate;

forming a second insulating substrate facing the first insulating substrate;

forming color filters of red, green and blue on the second insulating substrate;

forming a common electrode on the second insulating substrate with the color filters;

forming a second domain dividing member on the second insulating substrate;

forming a liquid crystal layer sandwiched between the first and the second insulating substrates with liquid crystal molecules, the liquid crystal molecules of the liquid crystal layer being vertically aligned with respect to the first and the second substrates when no electric field is applied between the pixel electrode and the common electrode; and

differentiating a B cell gap from an R cell gap or a G cell gap, the R cell gap indicates the thickness of the liquid crystal layer at the region of the red color filter, the G cell gap indicates the thickness of the liquid crystal layer at the region of the green color filter, and the B cell gap indicates the thickness of the liquid crystal layer at the region of the blue color filter, wherein the B cell gap, the R cell gap and the G cell gap are differentiated from each other by;

R cell gap−

G cell gap<

G cell gap−

B cell gap, and wherein the first and the second opening patterns partition the pixel region into a plurality of micro-domains.

11. The process of manufacturing according to claim 9, wherein the B cell gap is formed to be smaller than the R cell gap or the G cell gap by 0.2±

0.15 μ

m.

10. (canceled)