Turning film using array of roof prism structures
First Claim
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1. An optical turning film for providing light redirection, comprising:
- (a) an input surface on the turning film for accepting incident light comprising a plurality of roof prism structures arranged in a two-dimensional array;
(b) a substantially planar output surface on the turning film; and
wherein the roof prism structures further comprises a base section and a roof section, the base section having a shape of a diagonally sectioned rectangular cube and the roof section has a roof shape with two slanting roof facets.
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Abstract
The invention generally relates to an optical turning film for providing light redirection, comprising:
- (a) an input surface for accepting incident light comprising a plurality of roof prism structures arranged in a two-dimensional array; and,
- (b) a substantially planar output surface.
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Citations
9 Claims
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1. An optical turning film for providing light redirection, comprising:
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(a) an input surface on the turning film for accepting incident light comprising a plurality of roof prism structures arranged in a two-dimensional array; (b) a substantially planar output surface on the turning film; and wherein the roof prism structures further comprises a base section and a roof section, the base section having a shape of a diagonally sectioned rectangular cube and the roof section has a roof shape with two slanting roof facets. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An optical turning film for providing light collimation along a first direction and light redirection in a second direction substantially orthogonal to the first direction, the optical turning film comprising a plurality of roof prism structures arranged in a two-dimensional array, wherein the roof prism structures further comprises a base section and a roof section, the base section having a shape of a diagonally sectioned rectangular cube and the roof section has a roof shape with two slanting roof facets, wherein each roof prism structure further comprises:
- (i) an output facet substantially coplanar with the output surface of the turning film;
(ii) an input facet for accepting incident light, the input facet substantially orthogonal to the output facet;
(iii) roof facets meeting at a ridge, the roof facets intersecting at a peak angle in the range from about 60 to about 80 degrees;
wherein the roof facets are inclined, relative to a normal to the output facet, at a ridge angle between about 25 and 60 degrees from normal. - View Dependent Claims (8, 9)
- (i) an output facet substantially coplanar with the output surface of the turning film;
Specification