Liquid crystal display having wide viewing angle

• US 6,900,870 B2
• Filed: 06/10/2003
• Issued: 05/31/2005
• Est. Priority Date: 06/13/2000
• Status: Expired due to Term

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Song, Jang-Kun
• Primary Examiner(s): Flynn, Nathan J.
• Assistant Examiner(s): Erdem, Fazli
• Application Number:
  US10/457,404
• Publication Number:
  US 20030210372A1
• Time in Patent Office: 721 Days
• Field of Search: 349/130, 349/143, 349/122, 349/178, 349/128, 349/129, 349/134, 349/139, 349/106, 349/156, 349/160, 349/85
• US Class Current: 349/130
• 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 1/1393 the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells G02F1/1396, G02F1/141 take precedence

Abstract

Disclosed is a liquid crystal display comprising first and second substrates provided opposing one another; a liquid crystal layer made of liquid crystal material that is injected between the first and second substrates; pixel electrodes and a common electrode formed on at least one of the substrates, the pixel electrodes and common electrode generating an electric field that acts on the liquid crystal layer; and domain formation means for controlling a slanting direction of liquid crystal molecules within the liquid crystal layer, wherein m is an integer satisfying the following:
h/2(π/wp)^1/2−2≦m≦h/2(π/wp)^1/2+2

where m is a number of domains formed by dividing the pixel electrodes by the domain formation means, w is a length of a first direction of the pixel electrodes, h is a length of a second direction of the pixel electrodes, the second direction being perpendicular to the first direction, and p is a width of a second direction of the domain formation means.

Claims

1. A domain formed in a pixel of a liquid crystal display, comprising:

a long side having a length A; and

a short side having a length B, A being equal to or greater than 3B,

wherein m is an integer satisfying the following;

h/2(π

/wp)^1/2−

2≦

m≦

h/2(π

/wp)^1/2+2,

where w is a width of the pixel, h is a height of a pixel region, m is a number of domains formed in the pixel and p is a width of a domain divider.

2. The domain of claim 1, wherein the domain has a quadrilateral shape.

3. The domain of claim 1, wherein the domain divider is an aperture.

4. The domain of claim 1, wherein the domain divider is a protrusion.

5. The domain of claim 1, wherein the domain divider is a combination of an aperture and a protrusion.

6. A liquid crystal display of vertically aligned mode, comprising:

a first substrate with a pixel electrode formed thereon;

a second substrate with a common electrode formed thereon;

a pixel formed between the first substrate and second substrate; and

a domain divider formed on at least one of the pixel electrode and the common electrode,

wherein the domain divider forms a plurality of domains in a pixel, each domain having a closed shape that affects directions of liquid crystal molecule directors, and

the domain has a long side having a length A and a short side having a length B, A being equal to or greater than 3B.

7. The liquid crystal display of claim 6, wherein the domain has a quadrilateral shape.

8. The liquid crystal display of claim 7, wherein the pixel comprises an m number of domains, m being an integer satisfying the following:

h/2(π

/wp)^1/2−

2≦

m≦

h/2(π

/wp)^1/2+2,

where w is a width of the pixel, h is a height of the pixel, and p is a width of the domain divider.

9. The liquid crystal display of claim 8, wherein the domain divider is an aperture.

10. The liquid crystal display of claim 8, wherein the domain divider is a protrusion.

11. The liquid crystal display of claim 8, wherein the domain divider is a combination of an aperture and a protrusion.