LAMINATED OPTICAL FILM, AND LIQUID CRYSTAL PANEL AND LIQUID CRYSTAL DISPLAY APPARATUS USING THE LAMINATED OPTICAL FILM
First Claim
1. A laminated optical film, comprising, in this order:
- a polarizer;
a first optical compensation layer that has a refractive index ellipsoid exhibiting a relationship of nx>
ny=nz and an in-plane retardation Re1 of 80 to 300 nm;
a second optical compensation layer that has a refractive index ellipsoid exhibiting a relationship of nz>
nx=ny; and
a third optical compensation layer that has a refractive index ellipsoid exhibiting a relationship of nx>
ny=nz and an in-plane retardation Re3 of 80 to 200 nm,wherein an absorption axis of the polarizer is perpendicular to a slow axis of the first optical compensation layer.
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Abstract
An object of the present invention is to provide a laminated optical film, a liquid crystal panel, and a liquid crystal display apparatus that have an excellent screen contrast and have a small color shift.
A laminated optical film of the present invention includes in this order: a polarizer; a first optical compensation layer that has a refractive index ellipsoid exhibiting a relationship of nx>ny=nz and an in-plane retardation Re1 of 80 to 300 nm; a second optical compensation layer that has a refractive index ellipsoid exhibiting a relationship of nz>nx=ny; and a third optical compensation layer that has a refractive index ellipsoid exhibiting a relationship of nx>ny=nz and an in-plane retardation Re3 of 80 to 200 nm, wherein an absorption axis of the polarizer is perpendicular to a slow axis of the first optical compensation layer.
57 Citations
8 Claims
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1. A laminated optical film, comprising, in this order:
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a polarizer; a first optical compensation layer that has a refractive index ellipsoid exhibiting a relationship of nx>
ny=nz and an in-plane retardation Re1 of 80 to 300 nm;a second optical compensation layer that has a refractive index ellipsoid exhibiting a relationship of nz>
nx=ny; anda third optical compensation layer that has a refractive index ellipsoid exhibiting a relationship of nx>
ny=nz and an in-plane retardation Re3 of 80 to 200 nm,wherein an absorption axis of the polarizer is perpendicular to a slow axis of the first optical compensation layer. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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2. A laminated optical film, comprising, in this order:
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a polarizer; a first optical compensation layer that has a refractive index ellipsoid exhibiting a relationship of nx>
ny>
nz and an in-plane retardation Re1 of 80 to 300 nm;a second optical compensation layer that has a refractive index ellipsoid exhibiting a relationship of nz>
nx=ny; anda third optical compensation layer that has a refractive index ellipsoid exhibiting a relationship of nx>
ny=nz and an in-plane retardation Re3 of 80 to 200 nm,wherein an absorption axis of the polarizer is perpendicular to a slow axis of the first optical compensation layer.
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Specification
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- Resources
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Current AssigneeNitto Denko Corporation
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Original AssigneeNitto Denko Corporation
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InventorsKawamoto, Ikuo, Shutou, Shunsuke, Sabae, Misaki, Motomura, Hironori, Bitou, Masato
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Application NumberUS12/513,389Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current349/118CPC Class CodesG02B 5/305 including organic materials...G02B 5/3083 Birefringent or phase retar...G02F 1/133531 characterised by the arrang...G02F 1/13363 Birefringent elements, e.g....G02F 1/133634 the refractive index Nz per...G02F 2413/03 Number of plates being 3G02F 2413/04 Number of plates greater th...
