Liquid crystal displays having multi-domains and a manufacturing method thereof

• US 6,954,248 B2
• Filed: 10/15/2003
• Issued: 10/11/2005
• Est. Priority Date: 05/16/1998
• Status: Expired due to Term

• Current Assignee: Samsung Display Company Limited (Samsung Group)
• Original Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Inventors: Song, Jang-Kun, Park, Seung-Beom, Na, Byoung-Sun
• Primary Examiner(s): Nguyen, Dung T.
• Application Number:
  US10/684,524
• Publication Number:
  US 20040080697A1
• Time in Patent Office: 727 Days
• Field of Search: 349128-130, 349139-143, 349/178
• US Class Current: 349/142
• 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

A black matrix and a color filter are formed on a substrate, a indium-tin-oxide (ITO) common electrode are deposited thereon and then protrusion pattern made of sensitive material such as photoresist are formed on the common electrode with 3 to 20 micron width. A vertical alignment layer is coated thereon to complete a color filter substrate. After a thin film transistor (TFT) and a passivation film are formed on the other substrate, ITO is deposited on the passivation film and patterned to form a pixel electrode which contains open areas with 3 to 20 micron width. Then, a vertical alignment layer is coated to complete a TFT substrate. Two substrates are assembled in the manner that the apertures and the protrusion patterns are arranged on shifts and liquid crystal having negative dielectric anisotropy is injected between the substrates. Each Polarizer is attached at the outer surfaces of the LCD substrates. Compensation films may be attached between the polarizer and the substrate.

Claims

1. A liquid crystal display, comprising:

a first substrate having a first electrode;

a second substrate facing the first substrate and including a second electrode; and

a plurality of protrusions provided on at least one of the first and second substrates, the plurality of protrusions including a first protrusion having a branch extending along an edge of the first electrode.

2. The liquid crystal display of claim 1, wherein the plurality of protrusions are provided on the second substrate.

3. The liquid crystal display of claim 2, further comprising a plurality of apertures provided on the first substrate and including a first aperture.

4. The liquid crystal display of claim 3, wherein an edge of the first aperture is oblique to the edge of the first electrode, and an end of the first aperture is located near the edge of the first electrode.

5. The liquid crystal display of claim 4, wherein the branch extends from the first protrusion toward the end of the first aperture.

6. The liquid crystal display of claim 5, wherein the branch makes an acute angle with the edge of the first aperture.

7. The liquid crystal display of claim 6, wherein the width of the branch decreases as goes from the first protrusion to the end of the first aperture.

8. A liquid crystal display, comprising:

a first substrate;

a common electrode formed on the first substrate;

a protrusion pattern formed on the common electrode;

a second substrate facing the first substrate;

a pixel electrode formed on the second substrate;

an aperture pattern formed on the pixel electrode and alternatively arranged with the protrusion pattern;

first and second polarizers attached to outer surfaces of the first and second substrates, respectively, polarizing directions of the first and second polarizers being perpendicular to each other,

wherein the protrusion pattern comprises a wedge-shaped pattern, the wedge-shaped pattern having a first branch extended along a first edge of the pixel electrode to an area where the aperture pattern meets the first edge with an acute angle.

9. The liquid crystal display of claim 8, wherein a width of the first branch decreases as advancing to an end of the first branch.

10. The liquid crystal display of claim 9, wherein the wedge-shaped pattern has a second branch extending from a convex point of the wedge-shaped pattern toward a second edge of the pixel electrode.

11. The liquid crystal display of claim 10, wherein a width of the second branch decreases as advancing toward the second edge of the pixel electrode.

12. The liquid crystal display of claim 8, wherein the protrusion pattern has a symmetrical cross section.

13. The liquid crystal display of claim 8, wherein the protrusion pattern further comprises a line-shaped pattern arranged substantially parallel to the aperture pattern.

14. The liquid crystal display of claim 13, wherein the line-shaped pattern has a branch extended along a second edge of the pixel electrode toward an area where the aperture pattern stops near the second edge.

15. The liquid crystal display of claim 14, wherein a width of the branch of the line-shaped pattern decreases as advancing toward the area where the aperture pattern stops near the second edge.

16. The liquid crystal display of claim 8, wherein the aperture pattern further comprises a branch aperture extending from the first edge of the pixel electrode towards a concave point of the wedge-shaped pattern.

17. The liquid crystal display of claim 16, wherein a width of the branch aperture decreases as advancing toward the concave point of the wedge-shaped pattern.