Anamorphic light guide
Assignee3M Innovative Properties Company
InventorsAndrew J. Ouderkirk, Justina Sze Ying Lee, Ravi Palaniswamy, Arokiaraj Jesudoss, Kelly Reed Ingham
Life of this patent
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Abstract
A backlight system for a display is described. The system can include an anamorphic light guide that comprises a light receiving portion, a light diverting portion, and a light output portion. The light receiving portion receives light having an area illuminating a first aspect ratio and the output light portion outputs light having an area illuminating a second aspect ratio, the second aspect ratio greater than the first aspect ratio by at least an order of magnitude. The light input face is substantially perpendicular to light output face. The etendue of the light is substantially preserved.
Claims28
An anamorphic light guide, comprising:
- a light receiving portion;
- a light diverting portion;
- and
- a light output portion, wherein the light receiving portion receives light having an area illuminating a first aspect ratio and the output light portion outputs light having an area illuminating a second aspect ratio, the second aspect ratio greater than the first aspect ratio by at least a factor of four, and wherein the light input face is substantially perpendicular to light output face.
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An anamorphic light guide, comprising:
- a main body having a light input face;
- a light output portion;
- and
- a light diverting portion disposed between the light input face and the light output portion, wherein the light diverting portion comprises an array of spatially separated diverting structures, and wherein a plurality of diverting structures are bound on at least one major surface by a low index of refraction layer disposed between the diverting structure and the main body of the light guide.
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An anamorphic light guide, comprising:
- a main body having a light receiving portion;
- a light output portion;
- and
- a light diverting portion disposed between the light receiving portion and the light output portion, wherein the light diverting portion comprises a plurality of curved planar channels guiding light from the light receiving portion towards the light output portion, and wherein each curved planar channel is bound on at least one major surface by a low index of refraction layer disposed between the light diverting portion and the main body of the light guide.
Dependencies are inferred from the claim text.