Luminance-enhancing film, optical sheet member, and liquid crystal display device
First Claim
1. A luminance-enhancing film, comprising:
- a λ
/4 plate; and
a reflection polarizer,wherein the reflection polarizer sequentially includes a first light reflection layer, a second light reflection layer, and a third light reflection layer from the λ
/4 plate side,all of the first light reflection layer, the second light reflection layer, and the third light reflection layer are light reflection layers formed by fixing a cholesteric liquid crystalline phase,any one of the first light reflection layer, the second light reflection layer, and the third light reflection layer is a blue light reflection layer which has a reflection center wavelength of 380 nm to 499 nm and a reflectivity peak having a half band width of less than or equal to 100 nm, any one of the first light reflection layer, the second light reflection layer, and the third light reflection layer is a green light reflection layer which has a reflection center wavelength of 500 nm to 599 nm and a reflectivity peak having a half band width of less than or equal to 200 nm, and any one of the first light reflection layer, the second light reflection layer, and the third light reflection layer is a red light reflection layer which has a reflection center wavelength of 600 nm to 750 nm and a reflectivity peak having a half band width of less than or equal to 150 nm, andRth(550) of the first light reflection layer and Rth(550) of the second light reflection layer have opposite signs to each other in which Rth(550) represents retardation of each of the layers in a film thickness direction at a wavelength of 550 nm in the unit of nm.
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Accused Products
Abstract
The present invention provides a luminance-enhancing film including a λ/4 plate, and a reflection polarizer, including a first light reflection layer, a second light reflection layer, and a third light reflection layer from the λ/4 plate side sequentially, the light reflection layers being light reflection layers formed by fixing a cholesteric liquid crystalline phase, and including blue, green and red light reflection layers, and Rth(550) of the first light reflection layer and Rth(550) of the second light reflection layer having inverse signs; and a luminance-enhancing film including a λ/4 plate and a reflection polarizer including at least a light reflection layer formed of a rod-like cholesteric liquid crystal material and a light reflection layer formed of a disk-like cholesteric liquid crystal material. The luminance-enhancing film has high luminance and is able to suppress an oblique change in the color.
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Citations
22 Claims
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1. A luminance-enhancing film, comprising:
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a λ
/4 plate; anda reflection polarizer, wherein the reflection polarizer sequentially includes a first light reflection layer, a second light reflection layer, and a third light reflection layer from the λ
/4 plate side,all of the first light reflection layer, the second light reflection layer, and the third light reflection layer are light reflection layers formed by fixing a cholesteric liquid crystalline phase, any one of the first light reflection layer, the second light reflection layer, and the third light reflection layer is a blue light reflection layer which has a reflection center wavelength of 380 nm to 499 nm and a reflectivity peak having a half band width of less than or equal to 100 nm, any one of the first light reflection layer, the second light reflection layer, and the third light reflection layer is a green light reflection layer which has a reflection center wavelength of 500 nm to 599 nm and a reflectivity peak having a half band width of less than or equal to 200 nm, and any one of the first light reflection layer, the second light reflection layer, and the third light reflection layer is a red light reflection layer which has a reflection center wavelength of 600 nm to 750 nm and a reflectivity peak having a half band width of less than or equal to 150 nm, and Rth(550) of the first light reflection layer and Rth(550) of the second light reflection layer have opposite signs to each other in which Rth(550) represents retardation of each of the layers in a film thickness direction at a wavelength of 550 nm in the unit of nm. - View Dependent Claims (2, 3, 4, 5, 7, 9, 11, 13, 15, 17, 18, 19)
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6. A luminance-enhancing film, comprising:
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a λ
/4 plate; anda reflection polarizer, wherein the reflection polarizer includes at least two light reflection layers, both of the at least two light reflection layers are light reflection layers formed by fixing a cholesteric liquid crystalline phase, and the at least two light reflection layers comprise a combination of a light reflection layer whose cholesteric liquid crystal material is a rod-like liquid crystal compound, and a light reflection layer whose cholesteric liquid crystal material is a disk-like liquid crystal compound. - View Dependent Claims (8, 10, 12, 14, 16, 20, 22)
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21. A luminance-enhancing film, comprising:
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a λ
/4 plate; anda reflection polarizer, wherein the reflection polarizer sequentially includes a first light reflection layer, a second light reflection layer, and a third light reflection layer from the λ
/4 plate side,all of the first light reflection layer, the second light reflection layer, and the third light reflection layer are light reflection layers formed by fixing a cholesteric liquid crystalline phase, any one of the first light reflection layer, the second light reflection layer, and the third light reflection layer is a blue light reflection layer which has a reflection center wavelength of 380 nm to 499 nm and a reflectivity peak having a half band width of less than or equal to 100 nm, any one of the first light reflection layer, the second light reflection layer, and the third light reflection layer is a green light reflection layer which has a reflection center wavelength of 500 nm to 599 nm and a reflectivity peak having a half band width of less than or equal to 200 nm, and any one of the first light reflection layer, the second light reflection layer, and the third light reflection layer is a red light reflection layer which has a reflection center wavelength of 600 nm to 750 nm and a reflectivity peak having a half band width of less than or equal to 150 nm, and Rth(550) of the first light reflection layer and Rth(550) of the second light reflection layer have opposite signs to each other in which Rth(550) represents retardation of each of the layers in a film thickness direction at a wavelength of 550 nm in the unit of nm; and the at least two light reflection layers comprise a combination of a light reflection layer whose cholesteric liquid crystal material is a rod-like liquid crystal compound, and a light reflection layer whose cholesteric liquid crystal material is a disk-like liquid crystal compound.
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Specification