LIGHT-TRANSMITTING FILM, METHOD OF FORMING LIGHT-TRANSMITTING FILM, AND LIQUID CRYSTAL DISPLAY
First Claim
1. A light-transmitting film comprising:
- a light emission surface having a surface structure with prisms continuously disposed thereon,wherein each of the prisms has an index of refraction in an extension direction of the prisms, and an index of refraction in an alignment direction of the prisms which are different from each other.
2 Assignments
0 Petitions
Accused Products
Abstract
A light-transmitting film that has a predetermined polarization split function, in addition to a light-collecting function is provided. The index of refraction nx in a prism extension direction and the index of refraction in a prism alignment direction differ from each other. By generating a difference in the indices of refraction in the prism extension direction and the prism alignment direction orthogonal thereto, for the light incident on the light-transmitting film, the polarization component Lx oscillating in the prism extension direction and the polarization component Ly oscillating in the prism alignment direction can have different transmission characteristics. For example, by setting the index of refraction in the prism extension direction greater than the index of refraction in the prism alignment direction (nx>ny), among the light incident on the light-transmitting film, the amount of return light of the polarization component Lx oscillating in the prism extension direction is greater than that of the polarization component Ly oscillating in the prism alignment direction. In this way, not only a light-collecting function, but also a predetermined polarization split function is obtained.
31 Citations
20 Claims
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1. A light-transmitting film comprising:
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a light emission surface having a surface structure with prisms continuously disposed thereon, wherein each of the prisms has an index of refraction in an extension direction of the prisms, and an index of refraction in an alignment direction of the prisms which are different from each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of forming a light-transmitting film including a light incident surface and a light emission surface, the method comprising:
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forming a resin film having prisms continuously disposed on one surface; and stretching, after the formation of the resin film, the resin film in the extension direction of the prisms to generate a difference between an index of refraction in the extension direction of the prisms and an index of refraction in the alignment direction of the prisms. - View Dependent Claims (13, 14, 15, 16)
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17. A liquid crystal display apparatus comprising:
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a liquid crystal display panel; a pair of polarizers sandwiching the liquid crystal display panel; a light source illuminating the liquid crystal display panel; and a light-transmitting film interposed between the liquid crystal display panel and the light source, the light-transmitting film including a light incident surface and a light emission surface having a surface structure with prisms continuously disposed therein, wherein each of the prisms has an index of refraction in an extension direction of the prisms, and an index of refraction in an alignment direction of the prisms which are different from each other. - View Dependent Claims (18, 19, 20)
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Specification