Optical laminate, laminated optical film, and optical article
AssigneeFUJIFILM Corporation
InventorRyuji SANETO
Life of this patent
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Abstract
An optical laminate includes a selective reflection layer having at least one cholesteric liquid crystal layer, and a first adjacent layer disposed adjacent to an outermost cholesteric liquid crystal layer, the first adjacent layer being an optically isotropic layer or a C-plate. For the outermost cholesteric liquid crystal layer, a long-wavelength half-value wavelength λmax, a short-wavelength half-value wavelength λmin, and a number of helical pitches P are defined. Refractive indices nmax and nmin are determined as λmax/P and λmin/P, respectively. A refractive index n1 of the first adjacent layer satisfies nmax>n1, nmin<n1, and |(nmax·nmin)½−n1|≤0.03, thereby providing controlled optical characteristics.
Claims20
An optical laminate comprising:
- a selective reflection layer including at least one cholesteric liquid crystal layer;
- and
- a first adjacent layer that is disposed adjacent to an outermost cholesteric liquid crystal layer disposed on an outermost side of the selective reflection layer and that is selected from the group consisting of an optically isotropic layer and a C-plate,
- wherein, in a case where a half-value wavelength on a long wavelength side of a reflection spectrum of the outermost cholesteric liquid crystal layer is denoted by λmax, a half-value wavelength on a short wavelength side of the reflection spectrum of the outermost cholesteric liquid crystal layer is denoted by λmin, and the number of helical pitches of the outermost cholesteric liquid crystal layer is denoted by P, relationships of Expression (3) to Expression (5) are satisfied between nmax and nmin calculated by Expression (1) and Expression (2) and a refractive index n1 of the first adjacent layer on an outermost cholesteric liquid crystal layer side,
- n
-
- max
- =
- λ
-
- max
- /
- P
- ,
- Expression
-
- (
- 1
- )
- n
-
- min
- =
- λ
-
- min
- /
- P
- ,
- Expression
-
- (
- 2
- )
- n
-
- max
- >
- n
-
- 1
- ,
- Expression
-
- (
- 3
- )
- n
-
- min
- <
- n
-
- 1
- ,
- Expression
-
- (
- 4
- )
- ❘
- "\[LeftBracketingBar]"
- (
- n
-
- max
- ·
- n
-
- min
- )
- 1
- /
- 2
- -
- n
-
- 1
- ❘
- "\[RightBracketingBar]"
- ≤
- 0.03
- .
- Expression
-
- (
- 5
- )
An optical laminate comprising:
- a reflective type linear polarizer;
- a retardation layer;
- and
- a first adjacent layer selected from the group consisting of an optically isotropic layer and a C-plate, the first adjacent layer being disposed adjacent to the retardation layer on a side of the retardation layer opposite to a reflective type linear polarizer side,
- wherein in a case where a refractive index of the retardation layer in an in-plane slow axis direction is denoted by nx1, a refractive index of the retardation layer in an in-plane fast axis direction is denoted by ny1, and a refractive index of the first adjacent layer on the retardation layer side is denoted by n4, relationships of Expression (7) to Expression (9) are satisfied,
- nx
-
- 1
- >
- n
-
- 4
- ,
- Expression
-
- (
- 7
- )
- ny
-
- 1
- <
- n
-
- 4
- ,
- Expression
-
- (
- 8
- )
- ❘
- "\[LeftBracketingBar]"
- (
- nx
-
- 1
- ·
- ny
-
- 1
- )
- 1
- /
- 2
- -
- n
-
- 4
- ❘
- "\[RightBracketingBar]"
- ≤
- 0.03
- .
- Expression
-
- (
- 9
- )
Dependencies are inferred from the claim text.