Directional diffusing film
First Claim
1. A directional diffusing film comprising:
- a base film, and a plurality of convex directionality-providing elements regularly arranged on at least one surface of the base film;
wherein a section of a first directionality-providing element in a first plane including a top of the directionality-providing element has a substantially triangular shape, and a section of the directionality-providing element in a second plane including the top of the directionality-providing element and perpendicular to the first plane has a top of a second directionality-providing element and a shape of a continuous wave.
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Accused Products
Abstract
A directional diffusing film of the invention includes a base film, and a plurality of convex directionality-providing elements regularly arranged on at least one surface of the base film. A section of a first directionality-providing element in a first plane including a top of the directionality-providing element has a shape of a substantially triangle, and a section of the directionality-providing element in a second plane including the top of the directionality-providing element and perpendicular to the first plane has a top of a second directionality-providing element and a shape of a continuous wave. The directional diffusing film having characteristics specified by the invention can diffuse light in proper directionally diffused light, while maintaining high light-diffusing ability. The directional diffusing film utilizes light highly efficiently as compared with conventional diffusing films.
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Citations
11 Claims
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1. A directional diffusing film comprising:
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a base film, and a plurality of convex directionality-providing elements regularly arranged on at least one surface of the base film;
wherein a section of a first directionality-providing element in a first plane including a top of the directionality-providing element has a substantially triangular shape, and a section of the directionality-providing element in a second plane including the top of the directionality-providing element and perpendicular to the first plane has a top of a second directionality-providing element and a shape of a continuous wave. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A surface light source unit comprising:
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a light source, a surface light emitting means having a light-emitting surface that can emit a light from the light source in a predetermined direction, and a directional diffusing film that includes a base film, and a plurality of convex directionality-providing elements regularly arranged on at least one surface of the base film, wherein a section of a first directionality-providing element in a first plane including a top of the directionality-providing element has a substantially triangular shape, and a section of the directionality-providing element in a second plane including the top of the directionality-providing element and perpendicular to the first plane has a top of a second directionality-providing element and a shape of a continuous wave.
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11. A liquid crystal display comprising:
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a light source, a surface light emitting means having a light-emitting surface that can emit a light from the light source in a predetermined direction, a directional diffusing film that includes a base film, and a plurality of convex directionality-providing elements regularly arranged on at least one surface of the base film, and a transparent liquid-crystal element arranged on a light-emitting side of the directional diffusing film, wherein a section of a first directionality-providing element in a first plane including a top of the directionality-providing element has a substantially triangular shape, and a section of the directionality-providing element in a second plane including the top of the directionality-providing element and perpendicular to the first plane has a top of a second directionality-providing element and a shape of a continuous wave.
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Specification