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US 8,300,182 B2Granted
Depolarizing film, process for producing the same, and liquid-crystal display
AssigneeNitto Denko Corporation
InventorsHideyuki Yonezawa, Minoru Miyatake, Akinori Nishimura
Life of this patent
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Abstract
Disclosed herein is a depolarizing film which is excellent in productivity and can have a large area. The depolarizing film is obtained by using birefringent very short fibers instead of inorganic birefringent crystals, such as calcite, for use in conventional depolarizing elements.
Claims9
A depolarizing film comprising:
- a film made of a translucent resin;
- and
- a plurality of very short fibers dispersed in the film made of a translucent resin, wherein a refractive index nA of the very short fibers in a direction of a fiber axis is different from a refractive index nB of the very short fibers in a direction orthogonal to the fiber axis.
A depolarizing film comprising:
- a film made of a translucent resin;
- and
- a plurality of very short fibers dispersed in the film made of a translucent resin, each of which has a first birefringent region and a second birefringent region provided within the first birefringent region, wherein an average refractive index n0 of the translucent resin, a refractive index nA1of the first birefringent region in a direction of a fiber axis, and a refractive index nA2 of the second birefringent region in a direction of a fiber axis satisfy the relationship:
- n0<nA1<nA2 or nA2<nA1<n0.
1 more element
Dependencies are inferred from the claim text.