Liquid crystal display having wide viewing angle

• US 7,768,615 B2
• Filed: 01/18/2006
• Issued: 08/03/2010
• Est. Priority Date: 05/29/1997
• Status: Expired due to Fees

• Current Assignee: TCL China Star Optoelectronics Technology Co. Ltd. (TCL Technology Group Corp.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Chen, Jian-Min, Lyu, Jae-Jin, Kim, Kyeong-Hyeon, Lee, Hea-Ri
• Primary Examiner(s): RUDE, TIMOTHY L
• Application Number:
  US11/334,025
• Publication Number:
  US 20060114402A1
• Time in Patent Office: 1,658 Days
• Field of Search: None
• US Class Current: 349/143
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/1337 Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
• 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 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/134336 Matrix
• CPC Class Codes: G02F 1/134372 for fringe field switching [FFS] where the common electrode is not patterned
• CPC Class Codes: G02F 1/136213 Storage capacitors associated with the pixel electrode
• CPC Class Codes: G02F 1/137 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
• CPC Class Codes: G02F 1/13712 the liquid crystal having negative dielectric anisotropy
• 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
• CPC Class Codes: G02F 2201/128 field shaping

Abstract

Apertures are formed in the common electrode or in the pixel electrode of a liquid crystal display to form a fringe field. Storage capacitor electrodes are formed at the position corresponding to the apertures to prevent the light leakage due to the disclination caused by the fringe field. The apertures extend horizontally, vertically or obliquely. The apertures in adjacent pixel regions may have different directions to widen the viewing angle.

Claims

1. A liquid crystal display comprising:

a first substrate;

a gate line formed on the first substrate;

a data line formed on the first substrate;

a first field-generating electrode formed on the first substrate, the first field-generating electrode comprising a first aperture as a domain divider in an upper portion and a second aperture as a domain divider in a lower portion;

a second substrate, spaced apart from the first substrate, and

a liquid crystal layer comprising liquid crystal molecules having negative dielectric anisotropy and aligned substantially in a vertical direction to the first substrate when no electric field is applied to the liquid crystal layer, the liquid crystal layer being interposed between the first substrate and the second substrate and divided into a plurality of domain areas by the first aperture and the second aperture when an electric field is applied to the liquid crystal layer,

wherein the first aperture and the second aperture are linear apertures respectively, and are substantially arranged in a chevron and are slantingly extended with respect to the gate line or the data line,

wherein no other linear aperture as a domain divider crosses over or meets the first aperture or the second aperture, and the first and second apertures are spaced apart from each other in a pixel region, and

wherein widths of the first aperture and the second aperture are about 3 μ

m to about 15 μ

m, respectively.

2. A liquid crystal display of claim 1, further comprises an organic insulating layer formed on the data line and the gate line, wherein the first field-generating electrode is formed on the organic insulating layer.

3. A liquid crystal display of claim 2, wherein the organic insulating layer is equal or more than 3 um.

4. A liquid crystal display of claim 2, further comprises an organic spacer disposed between the first substrate and the second substrate.

5. A liquid crystal display of claim 1, further comprises a first storage electrode overlapped with one of edge portions of the first field-generating electrode, wherein the first storage electrode extends in parallel with the gate line and one portion of outer edge lines of the first field-generating electrode is disposed inside the first storage electrode and along the first storage electrode.

6. A liquid crystal display of claim 5, further comprises a second storage electrode overlapped with the first field-generating electrode and electrically connected to the first storage electrode, wherein the second storage electrode extends in parallel with the data line.

7. A liquid crystal display of claim 5, further comprises a third storage electrode overlapped with the first field-generating electrode and electrically connected to the first storage electrode, wherein the third storage electrode slantingly extends with respect to the gate line or the data line.

8. A liquid crystal display of claim 1, wherein the liquid crystal layer is divided into four different domain areas by the first aperture and the second aperture.

9. A liquid crystal display of claim 8, further comprises a first storage electrode overlapped with one of edge portions of the first field-generating electrode, wherein the first storage electrode extends in parallel with the gate line and one portion of outer edge lines of the first field-generating electrode is disposed inside the first storage electrode and along the first storage electrode.

10. A liquid crystal display of claim 9, further comprises a second storage electrode overlapped with the first field-generating electrode and electrically connected to the first storage electrode, wherein the second storage electrode extends in parallel with the data line.

11. A liquid crystal display of claim 9, further comprises a third storage electrode overlapped with the first field-generating electrode and electrically connected to the first storage electrode, wherein the third storage electrode slantingly extends with respect to the gate line or the data line.

12. A liquid crystal display of claim 1, wherein the first field-generating electrode overlaps adjacent data lines.

13. A liquid crystal display of claim 12, wherein the first field-generating electrode overlaps the gate line.