Ultra-thin backlight
First Claim
1. An apparatus to serve for display or lighting, comprising:
- a hybrid wave guide with at least one edge and two faces, at least one of said faces including a multi-sectioned, doubly curved light guiding arrangement;
at least one light source, coupled to the other of the said faces of the hybrid wave guide; and
a reflector, disposed proximate to at least one of the faces;
wherein light is injected into the hybrid wave guide by said light source in a first direction and exits said light guiding arrangement in a second direction, and said light guiding arrangement has a thickness that diminishes nonlinearly as a function of distance from each of said light sources along both coordinate axes of the respective faces.
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Abstract
A thin-profile, optically efficient lighting device for use with, among other things, flat information displays, includes a combination of two optically coupled light propagating structures. The first structure may be a compound hyperbolic-elliptic element, adapted to receive light from at least one light source, such as a light emitting diode, and inject it into the second structure, which generally is larger and has hyperbolic-elliptic shape and a plurality of flux extractors. The latter redirect the light flux so that it propagates out of the second structure with a desired luminance and/or intensity distribution in a direction that is essentially perpendicular to the surface of the second structure. The flux extractors may also be of the active, i.e. wavelength-converting, type.
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Citations
35 Claims
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1. An apparatus to serve for display or lighting, comprising:
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a hybrid wave guide with at least one edge and two faces, at least one of said faces including a multi-sectioned, doubly curved light guiding arrangement; at least one light source, coupled to the other of the said faces of the hybrid wave guide; and a reflector, disposed proximate to at least one of the faces; wherein light is injected into the hybrid wave guide by said light source in a first direction and exits said light guiding arrangement in a second direction, and said light guiding arrangement has a thickness that diminishes nonlinearly as a function of distance from each of said light sources along both coordinate axes of the respective faces. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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20. A liquid crystal display device, comprising:
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a liquid crystal display module; and a backlight structure, including; a light source, a wave guide, including two faces, a primary foconic coupler disposed between the light source and a face of the wave guide, a secondary doubly curved waveguide section coaxial with the light source or centered at the light source and integrally formed with the primary foconic coupler, at least one passive and/or active downconverting light extraction/conversion means, disposed integrally to one or both of the faces of the wave guide and/or the light source, and extraction/conversion means, disposed integrally to one or both of the faces of the wave guide and/or the light source, and a reflector disposed proximate to one of the faces of the wave guide.
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Specification