Retardation film, method for manufacturing retardation film, method for manufacturing laminated retardation film, optical film, and image display apparatus
First Claim
1. A retardation film, showing birefringence, wherein the said retardation film comprises a non-liquid crystal polymer, the non-liquid crystal polymer is aligned, alignment of the non-liquid crystal polymer on at least one of surfaces of the retardation film is different from alignment of the non-liquid crystal polymer on an inside of the retardation film, and the surface having the alignment that is different from the alignment on the inside functions as an alignment surface.
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Abstract
The present invention provides a retardation film on which birefringent layers having different alignment directions can be formed directly. A surface of a polymer film showing birefringence is irradiated with polarized light so as to change an alignment direction of only the surface of the film to be different from an alignment direction of an inside of the film, thereby manufacturing a retardation film having the surface that is processed into an alignment surface. Since this film is a retardation film that also functions as an alignment film, if a liquid crystal layer is formed directly on the alignment surface and is aligned, the birefringent layer having the alignment direction that is different from the alignment direction of the retardation film can be formed on the retardation film.
20 Citations
30 Claims
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1. A retardation film, showing birefringence, wherein
the said retardation film comprises a non-liquid crystal polymer, the non-liquid crystal polymer is aligned, alignment of the non-liquid crystal polymer on at least one of surfaces of the retardation film is different from alignment of the non-liquid crystal polymer on an inside of the retardation film, and the surface having the alignment that is different from the alignment on the inside functions as an alignment surface.
- 6. A method for manufacturing a retardation film, comprising a step of forming an alignment surface by irradiating at least one of surfaces of a polymer film showing birefringence with polarized light so as to change an alignment direction of only the surface of the polymer film that is irradiated with the polarized light.
Specification