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US 2006/0221280 A1Published application
Liquid crystal display
AssigneeHitachi Displays, Ltd.
InventorsShinichiro Oka, Masaya Adachi, Shinichi Komura, Ikuo Hiyama
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Abstract
A liquid crystal display of a vertical alignment (VA) mode using a circular polarization plate is provided which can reduce light leak as observed along an oblique direction and achieve a high contrast ratio. The VA mode uses a liquid crystal layer of vertical alignment in an initial alignment state. A film having generally isotropic optical characteristics in an omnidirection is used as a protective film, on a liquid crystal cell side, of first and second polarization plates disposed outside the liquid crystal cell, and first and fourth retardation films have an Nz coefficient smaller than 1.
Claims20
A liquid crystal display comprising:
- a first substrate and a second substrate;
- a liquid crystal layer sandwiched between said first substrate and said second substrate;
- a first polarization plate disposed on said first substrate on a side opposite to said liquid crystal layer;
- a second polarization plate disposed on said second substrate on a side opposite to said liquid crystal layer;
- one or more retardation films disposed between said first substrate and said first polarization plate and between said second substrate and said second polarization plate;
- pixel electrodes disposed on one of said first substrate and said second substrate on a side of said liquid crystal layer;
- and
- a counter electrode disposed on the other of said first substrate and said second substrate on the side of said liquid crystal layer,
- wherein:
- longer axes of liquid crystal molecules of said liquid crystal layer are aligned generally perpendicular to said first substrate and said second substrate while voltage is not applied;
- said first polarization plate and said second polarization plate include each a polarization layer and a pair of protective layers sandwiching said polarization layer;
- and
- a retardation Rth of said protective layers disposed on said first polarization plate and said second polarization plate on the side opposite to said liquid crystal layer is −5 nm or larger and 5 nm or smaller.
10 more elements
A liquid crystal display comprising:
- a first substrate and a second substrate;
- a liquid crystal layer sandwiched between said first substrate and said second substrate;
- a first polarization plate disposed on said first substrate on a side opposite to said liquid crystal layer;
- a second polarization plate disposed on said second substrate on a side opposite to said liquid crystal layer;
- one or more retardation films disposed between said first substrate and said first polarization plate and between said second substrate and said second polarization plate;
- pixel electrodes disposed on one of said first substrate and said second substrate on a side of said liquid crystal layer;
- and
- a counter electrode disposed on the other of said first substrate and said second substrate on the side of said liquid crystal layer,
- wherein:
- longer axes of liquid crystal molecules of said liquid crystal layer are aligned generally perpendicular to said first substrate and said second substrate while voltage is not applied;
- and
- said first polarization plate and said second polarization plate include each a polarization layer and a protective layer disposed on said polarization layer only on the side opposite to said liquid crystal layer.
9 more elements
A liquid crystal display comprising:
- a first substrate and a second substrate;
- a liquid crystal layer sandwiched between said first substrate and said second substrate;
- a first polarization plate disposed on said first substrate on a side opposite to said liquid crystal layer;
- a second polarization plate disposed on said second substrate on a side opposite to said liquid crystal layer;
- one or more retardation films disposed between said first substrate and said first polarization plate and between said second substrate and said second polarization plate;
- pixel electrodes disposed on one of said first substrate and said second substrate on a side of said liquid crystal layer;
- and
- a counter electrode disposed on the other of said first substrate and said second substrate on the side of said liquid crystal layer,
- wherein:
- longer axes of liquid crystal molecules of said liquid crystal layer are aligned generally perpendicular to said first substrate and said second substrate while voltage is not applied;
- and
- a positive C-Plate is disposed between said first substrate and said first polarization plate and between said second substrate and said second polarization plate.
9 more elements
Dependencies are inferred from the claim text.