Liquid crystal display device

• US 8,847,863 B2
• Filed: 12/20/2010
• Issued: 09/30/2014
• Est. Priority Date: 02/16/2010
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Iyama, Yuichi, Shibazaki, Akira, Hashimoto, Yoshito, Shimizu, Masahiro, Tsuchiya, Hiroshi, Nishihara, Yusuke, Kuboki, Ken
• Primary Examiner(s): SHENG, TOM V
• Application Number:
  US13/577,987
• Publication Number:
  US 20120306731A1
• Time in Patent Office: 1,380 Days
• Field of Search: 345/87, 345/204, 349/38, 349/39, 349139-142
• US Class Current: 345/87
• 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 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/136213 Storage capacitors associated with the pixel electrode

Abstract

Disclosed is a liquid crystal display device of active matrix type. Each pixel electrode (1) includes either a single regional electrode (2) or two or more regional electrodes (2) which are electrically connected to each other. The or each regional electrode is provided with: a first electrode (cross-shaped electrode) (3) which has a pattern dividing a first region into a plurality of second regions (R1, R2, R3, and R4); and a plurality of stripe electrodes (4) which are provided in each of the second regions so as to extend from the first electrode and so as to be separated from each other by a distance. A storage capacitor line (CSL) is provided facing one of pixel electrodes (1) in a film thickness direction to form a storage capacitor. The storage capacitor line (CSL) is provided so as not to extend facing an edge (2e, 2e′) of a first region in the film thickness direction parallelly to the edge (2e, 2e′). The invention eliminates irregular orientation of liquid crystal molecules in polymer sustained alignment.

Claims

1. A liquid crystal display device of active matrix type, comprising:

a liquid crystal layer;

pixel electrodes;

a common electrode; and

storage capacitor lines, wherein

the liquid crystal layer is located between the pixel electrodes and the common electrode,

each of the pixel electrodes includes either a single regional electrode or two or more regional electrodes which are electrically connected to each other, each of the regional electrodes being provided with;

a first electrode which has a pattern dividing a first region where the regional electrode is formed into a plurality of second regions; and

a plurality of stripe electrodes which are provided in each of the plurality of second regions so as to extend from the first electrode and so as to be separated from each other by a distance,

each of the storage capacitor lines is provided facing one of the pixel electrodes in a film thickness direction, so as not to extend facing an edge of the first region in the film thickness direction parallelly to the edge, the storage capacitor line being allocated to that pixel electrode to form a storage capacitor,

each of the regional electrodes is provided with a second electrode forming an entire periphery of the first region, and

the first electrode and the plurality of stripe electrodes of each of the regional electrodes are connected to the second electrode in the periphery.

2. The liquid crystal display device as set forth in claim 1, wherein the storage capacitor line is provided so as to face the first electrode in the film thickness direction.

3. The liquid crystal display device as set forth in claim 1, wherein those different ones of the storage capacitor lines, which are allocated respectively to two adjacent ones of the pixel electrodes, are connected to each other by a branch line overlapping the two pixel electrodes in the film thickness direction.

4. The liquid crystal display device as set forth in claim 3, wherein the branch line is provided so as to face the first electrodes for the two pixel electrodes in the film thickness direction.

5. The liquid crystal display device as set forth in claim 1, wherein the liquid crystal layer contains liquid crystal molecules which have a negative dielectric anisotropy and to which a pretilt angle is imparted by use of a polymer.

6. The liquid crystal display device as set forth in claim 1, wherein:

the pattern of the first electrode is a wiring pattern extending in a row direction and in a column direction; and

each of the plurality of stripe electrodes extends in a direction at an angle to the first electrode.

7. The liquid crystal display device as set forth in claim 6, wherein in those of the plurality of second regions which, in each of the regional electrodes, are adjacent either in the row direction or in the column direction with the first electrode intervening between those second regions, the plurality of stripe electrodes extend in a direction which differs from one second region to another.

8. A liquid crystal display device of active matrix type, comprising:

a liquid crystal layer;

pixel electrodes;

a common electrode; and

storage capacitor lines, wherein

the liquid crystal layer is located between the pixel electrodes and the common electrode,

each of the pixel electrodes includes either a single regional electrode or two or more regional electrodes which are electrically connected to each other, each of the regional electrodes being provided with;

a first electrode which has a pattern dividing a first region where the regional electrode is formed into a plurality of second regions; and

a plurality of stripe electrodes which are provided in each of the plurality of second regions so as to extend from the first electrode and so as to be separated from each other by a distance, and

each of the storage capacitor lines is provided for one of the pixel electrodes to which that storage capacitor line is allocated to form a storage capacitor, the storage capacitor line being provided with;

a first wiring section which extends facing an edge of the first region parallelly to the edge; and

a second wiring section which extends from the first wiring section in a direction intersecting with the first wiring section in an area which is located facing the first region.

9. The liquid crystal display device as set forth in claim 8, wherein the second wiring section is located so as to face the first electrode in the film thickness direction.

10. The liquid crystal display device as set forth in claim 8, wherein:

each of the regional electrodes is provided with a second electrode forming a periphery of the first region except for the edge; and

the first electrode and the plurality of stripe electrodes of each of the regional electrodes are connected to the second electrode in the periphery.

11. The liquid crystal display device as set forth in claim 8, wherein the liquid crystal layer contains liquid crystal molecules which have a negative dielectric anisotropy and to which a pretilt angle is imparted by use of a polymer.

12. The liquid crystal display device as set forth in claim 8, wherein:

the pattern of the first electrode is a wiring pattern extending in a row direction and in a column direction; and

each of the plurality of stripe electrodes extends in a direction at an angle to the first electrode.

13. The liquid crystal display device as set forth in claim 12, wherein in those of the plurality of second regions which, in each of the regional electrodes, are adjacent either in the row direction or in the column direction with the first electrode intervening between those second regions, the plurality of stripe electrodes extend in a direction which differs from one second region to another.