Liquid crystal display device

Patent metadata

Field	Value
Publication number	US-9268073-B2
Application number	US-201013518284-A
Country	US
Kind code	B2
Filing date	Dec 24, 2010
Priority date	Dec 29, 2009
Publication date	Feb 23, 2016
Grant date	Feb 23, 2016

Abstract

The present invention provides a counter electrode ( 13 ) and an alignment controlling electrode opening ( 14 ) directly on a color filter colored layer ( 12 ) to produce a liquid crystal display device ( 1 ) of a vertical alignment (VA) display mode. The present invention includes no overcoat layer for the color filter colored layer ( 12 ), and adjusts the thickness, pigment concentrations and the like for the color filter colored layer ( 12 ) to achieve a wide color reproduction range and high alignment stability.

First claim

The invention claimed is:

1. A liquid crystal display device comprising:
a first substrate;
a second substrate provided so as to face the first substrate; and
a liquid crystal layer provided between the first substrate and the second substrate, the liquid crystal layer having negative dielectric anisotropy and achieving a substantially vertical alignment state while no voltage is being applied,
the first substrate having an inner surface on which (i) at least one active element and (ii) a pixel electrode connected to the at least one active element which are formed on an inner surface of the first substrate,
(iii) a predetermined color filter colored layer are provided for each of pixels,
the liquid crystal display device further comprising:
a counter electrode provided at a predetermined position within said each of pixels and including at least one electrode opening,
wherein:
an overcoat layer for covering the color filter colored layer is not provided between the color filter colored layer and the liquid crystal layer; and
the color filter colored layer has (i) a layer thickness of not less than 1.8 μm and not greater than 3.2 μm and (ii) a specific resistance value of not less than 1.0×10 15 Ω·cm.

2. The liquid crystal display device according to claim 1 ,
wherein:
the first substrate is provided with the color filter colored layer, and
the color filter colored layer is provided in a layer below the pixel electrode provided above the at least one active element on the inner surface of the first substrate.

3. The liquid crystal display device according to claim 1 ,
wherein:
the second substrate is provided with the color filter colored layer, and
the counter electrode is provided directly on the color filter colored layer.

4. The liquid crystal display device according to claim 1 ,
wherein:
the liquid crystal display device has a color reproduction range of at least 65% in NTSC ratio.

5. The liquid crystal display device according to claim 1 ,
wherein:
the at least one electrode opening included in the counter electrode is provided in a vicinity of a central portion of at least one liquid crystal region formed within said each of pixels.

6. The liquid crystal display device according to claim 1 ,
wherein:
the at least one electrode opening provided on a side of the counter substrate includes, within said each of pixels, (i) a plurality of first linear sections extending in a first direction and (ii) a plurality of second linear sections extending in a second direction different from the first direction;
adjacent two of the plurality of first linear sections are substantially parallel to each other; and
the first direction and the second direction form an angle of substantially 90°.

7. The liquid crystal display device according to claim 6 ,
wherein:
the pixel electrode includes at least one opening or notch section provided at a predetermined position within said each of pixels and serving to control alignment of liquid crystal;
the at least one opening or notch section includes, within said each of pixels, (i) a plurality of third linear sections extending in the first direction and (ii) a plurality of fourth linear sections extending in the second direction different from the first direction; and
in a case where the counter electrode and the pixel electrode are provided respectively on upper and lower inner surfaces between which the liquid crystal layer is interposed, (i) the plurality of first linear sections and the plurality of third linear sections are parallel to each other and provided individually alternately at a predetermined distance from each other, and (ii) the plurality of second linear sections and the plurality of fourth linear sections are parallel to each other and provided individually alternately at the predetermined distance from each other.

8. The liquid crystal display device according to claim 1 ,
wherein:
the pixel electrode includes at least one opening or notch section provided at a predetermined position within said each of pixels and serving to control alignment of liquid crystal.

9. The liquid crystal display device according to claim 8 ,
wherein:
the pixel electrode includes, within said each of pixels and as the at least one opening or notch section, at least (i) a first fine pattern having a plurality of first branch sections extending in a first direction and (ii) a second fine pattern having a plurality of second branch sections extending in a second direction different from the first direction; and
either the first direction or the second direction forms an angle of 45° with respect to respective absorption axes, orthogonal to each other, of polarizing plates that are provided respectively for respective outer surfaces of the first and second substrates.

10. The liquid crystal display device according to claim 9 ,
wherein:
the pixel electrode has a structural pattern including a trunk section extending in a direction in which the pixels are arranged; and
the plurality of first branch sections extend from the trunk section in the first direction, whereas the plurality of second branch sections extend from the trunk section in the second direction.

Assignees

• Kikuchi Katsuhiro
• Ochi Takashi
• Sharp Kk

Inventors

• Kikuchi Katsuhiro
• Ochi Takashi

Classifications

• G02F1/1393

  the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells (G02F1/1396, G02F1/141 take precedence) · CPC title

• G02F2201/121

  common or background · CPC title

• G02F1/133512

  Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence) · CPC title

• G02F1/133707

  Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes · CPC title

• G02F2001/136222

  Physics · mapped topic