BACKLIGHT
First Claim
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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 for extracting light from a face of the lightguide towards the at least one prism layer in one or more preferential directions which are away from normal to the lightguide, wherein each of the one or more preferential 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.
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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 for extracting light from a face of the lightguide towards the at least one prism layer in one or more preferential directions which are away from normal to the lightguide, wherein each of the one or more preferential 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