Liquid crystal display having wide viewing angle

• US 7,016,004 B2
• Filed: 08/02/2004
• Issued: 03/21/2006
• Est. Priority Date: 05/29/1997
• Status: Expired due to Term

• Current Assignee: TCL China Star Optoelectronics Technology Co. Ltd. (TCL Technology Group Corp.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lyu, Jae-Jin, Lee, Hea-Ri, Chen, Jian-Min, Kim, Kyeong-Hyeon
• Primary Examiner(s): CHOWDHURY, TARIFUR RASHID
• Application Number:
  US10/903,480
• Publication Number:
  US 20050062923A1
• Time in Patent Office: 596 Days
• Field of Search: 349/38, 349/39, 349/129, 349/130, 349/139, 349/141, 349/143
• 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 second substrate, spaced apart from the first substrate;

a first adjacent pixel region on the first substrate;

a second adjacent pixel region on the second substrate; and

first and second field-generating electrodes on the first and second adjacent pixel regions, respectively, the first field-generating electrode having a first aperture and a second aperture and the second field-generating electrode having a third aperture and a fourth aperture, an orientation of at least one of the first and second apertures of the first field-generating electrode being different from an orientation of at least one of the third and fourth apertures of the second field-generating electrode;

wherein the one of the first and second substrates comprising the first and second pixel regions comprises a plurality of data lines and a plurality of gate lines that define the first and second pixel regions, wherein orientations of the first and second apertures in the first field-generating electrode are parallel to the plurality of data lines or wherein orientations of the third and fourth apertures of the second field-generating electrode are perpendicular to the plurality of data lines.

2. A liquid crystal display, comprising:

a first substrate;

a second substrate, spaced apart from the first substrate;

a first adjacent pixel region on the first substrate;

a second adjacent pixel region on the second substrate; and

first and second field-generating electrodes on the first and second adjacent pixel regions, respectively, the first field-generating electrode having a first aperture and a second aperture and the second field-generating electrode having a third aperture and a fourth aperture, an orientation of at least one of the first and second apertures of the first field-generating electrode being different from an orientation of at least one of the third and fourth apertures of the second field-generating electrode;

wherein the first and second apertures extend downward at angle from a left side of the first field-generating electrode and wherein the third and fourth apertures extend downward at angle from a right side of the second field-generating electrode.

3. The liquid crystal display of claim 2, wherein the angle between the left side of the first field-generating electrode and an under side of the first aperture and an under side of the second aperture is from about 30 to about 50 degrees and wherein the angle between the right side of the second field-generating electrode and an under side of the third aperture and an under side of the fourth aperture is from about 30 to about 50 degrees.

4. A liquid crystal display, comprising:

a first substrate;

a second substrate, spaced apart from the first substrate;

a first adjacent pixel region on the first substrate;

a second adjacent pixel region on the second substrate; and

first and second field-generating electrodes on the first and second adjacent pixel regions, respectively, the first field-generating electrode having a first aperture and a second aperture and the second field-generating electrode having a third aperture and a fourth aperture, an orientation of at least one of the first and second apertures of the first field-generating electrode being different from an orientation of at least one of the third and fourth apertures of the second field-generating electrode;

wherein the first and third apertures extend downward at angle from a left side of the first field-generating electrode and wherein the second and fourth apertures extend downward at angle from a right side of the second field-generating electrode.

5. The liquid crystal display of claim 4, wherein the angle between the left side of the first field-generating electrode and an under side of the first aperture and an under side of the third aperture is from about 120 to about 150 degrees and wherein the angle between the right side of the second field-generating electrode and an under side of the second aperture and an under side of the fourth aperture is from about 120 to about 150 degrees.

6. A liquid crystal display, comprising:

a first substrate;

a second substrate, spaced apart from the first substrate;

a first adjacent pixel region on the first substrate;

a second adjacent pixel region on the second substrate; and

first and second field-generating electrodes on the first and second adjacent pixel regions, respectively, the first field-generating electrode having a first aperture and a second aperture and the second field-generating electrode having a third aperture and a fourth aperture, an orientation of at least one of the first and second apertures of the first field-generating electrode being different from an orientation of at least one of the third and fourth apertures of the second field-generating electrode;

wherein a distance between the first aperture and the second aperture is from about 8 μ

m to about 50 μ

m and wherein a distance between the third aperture and the fourth aperture is from about 8 μ

m to about 50 μ

m.