Backlight
First Claim
Patent Images
1. A backlight system, comprising:
- a lightguide for transferring light by total internal reflection;
at least one prism layer having an array of prism structures; and
an extraction feature structure configured to extract light from a first face of the lightguide towards the at least one prism layer in one or more directions determined by directions of a main diffractive order of the extracted light, the one or more directions being at a non-zero angle with respect to normal of the first face, wherein each of the one or more directions is specific to a corresponding acceptance angle of the prism structures to produce collimated emission of the extracted light from the at least one prism layer.
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Abstract
A backlight is provided for illuminating an at least partially transmissive display. The backlight includes a light source. A light guide receives the light from an edge surface and guides the light by total internal reflection. The light extracted from the lightguide has an angular emission profile such that when incident on a prism film, collimated light is produced.
10 Citations
20 Claims
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1. A backlight system, comprising:
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a lightguide for transferring light by total internal reflection; at least one prism layer having an array of prism structures; and an extraction feature structure configured to extract light from a first face of the lightguide towards the at least one prism layer in one or more directions determined by directions of a main diffractive order of the extracted light, the one or more directions being at a non-zero angle with respect to normal of the first face, wherein each of the one or more directions is specific to a corresponding acceptance angle of the prism structures to produce collimated emission of the extracted light from the at least one prism layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification