Liquid crystal display panel

• US 8,804,084 B2
• Filed: 12/22/2010
• Issued: 08/12/2014
• Est. Priority Date: 12/22/2010
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Inventors: Yoso, Aya, Nishimura, Joji, Kurasawa, Hayato
• Primary Examiner(s): NGUYEN, DUNG T
• Application Number:
  US12/976,365
• Publication Number:
  US 20120162589A1
• Time in Patent Office: 1,329 Days
• Field of Search: 349/129, 349139-144
• US Class Current: 349/144
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take 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 1/133784 by rubbing
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/134372 for fringe field switching [FFS] where the common electrode is not patterned
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G02F 2201/128 field shaping

Abstract

A liquid crystal display panel is provides and includes a pair of substrates arranged face to face so as to sandwich a liquid crystal layer. The liquid crystal device includes on one of the pair of substrates: a lower electrode; an upper electrode formed on a surface of the lower substrate through an insulating layer, in which plural slits are formed in each sub-pixel; and an alignment film formed so as to cover a surface of the upper electrode and the insulating layer. The plural slits have different widths at both ends of slits in a longitudinal direction.

Claims

1. A liquid crystal display panel comprising:

a pair of substrates arranged face to face so as to sandwich a liquid crystal layer;

a lower electrode formed on a lower substrate;

an upper electrode formed on a surface of the lower substrate through an insulating layer, in which plural slits are formed in each sub-pixel, wherein each of the plural slits is formed as an aperture in which both ends thereof in the longitudinal direction are closed; and

an alignment film formed so as to cover a surface of the upper electrode and the insulating layer,

wherein the plural slits have different widths at both ends of slits in a longitudinal direction,

wherein a rubbing direction of the alignment film is in a direction crossing all edges corresponding to the longitudinal direction of the slits,

wherein each of the plurality of slits has a first long edge and a second long edge, and

wherein an angle between the first long edge and the rubbing direction is different than an angle between the second long edge and the rubbing direction.

2. The liquid crystal display panel according to claim 1,

wherein each of the plural slits is made to be symmetrical with respect to a central axis in a long edge direction.

3. The liquid crystal display panel according to claim 1,

wherein edges of the slit along the longitudinal direction are formed to be asymmetrical with respect to an axis corresponding to the longitudinal direction of the slit.

4. The liquid crystal display panel according to claim 1,

wherein the slit has a folding portion at which edges of the slit along the longitudinal direction of the slit are folded in a direction in which the edges are apart from each other.

5. The liquid crystal display panel according to claim 1,

wherein plural pairs of slits are included, in which slits in each pair have different shapes respectively.

6. The liquid crystal display panel according to claim 5,

wherein the slits in each pair having the same shape are arranged to be inverted with respect to each other at a central axis in the direction orthogonal to the longitudinal direction of the slits.

7. The liquid crystal display panel according to claim 6,

wherein the slits in each pair are formed so that edges of adjacent slits along the longitudinal direction are parallel to each other.

8. The liquid crystal display panel according to claim 5,

wherein the slits in each pair having different shapes are arranged to be inverted with respect to each other at a central axis in the direction orthogonal to the longitudinal direction of slits.

9. The liquid crystal display panel according to claim 8,

wherein the slits in each pair are formed so that edges of adjacent slits along the longitudinal direction are parallel to each other.

10. The liquid crystal display panel according to claim 5,

wherein the slits in each pair are formed so that edges of adjacent slits along the longitudinal direction are parallel to each other.