LED light engine for backlighting a liquid crystal display
First Claim
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1. A light-strip for use in an edge-lit backlighting system employed with a liquid crystal display, comprising:
- a thermally conductive substrate formed in an elongated strip;
a plurality of light engines mounted at spaced intervals along said elongated strip, each of said light engines including a plurality of primary color light emitting diodes, said light emitting diodes being selected so that when collectively illuminated a white light of desired reference white chromaticity is produced.
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Abstract
An edge-lit backlighting system for liquid crystal displays employs a number of light strips in the form of thin, light weight sections of a thermally conductive substrate each of which mounts a plurality of light engines having an array of densely packed, primary color light emitting diodes, which, when collectively illuminated, produce a white light of desired reference white chromaticity.
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Citations
26 Claims
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1. A light-strip for use in an edge-lit backlighting system employed with a liquid crystal display, comprising:
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a thermally conductive substrate formed in an elongated strip;
a plurality of light engines mounted at spaced intervals along said elongated strip, each of said light engines including a plurality of primary color light emitting diodes, said light emitting diodes being selected so that when collectively illuminated a white light of desired reference white chromaticity is produced. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A light strip for use in an edge-lit backlighting system employed with a liquid crystal display, comprising:
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a thermally conductive substrate formed in an elongated strip;
a plurality of light engines mounted at spaced intervals along said elongated strip, each of said light engines including a plurality of primary color light emitting diodes arranged in an array of at least two parallel legs, said light emitting diodes in each leg being connected in series, said light emitting diodes being selected so that when collectively illuminated a white light of desired reference white chromaticity is produced. - View Dependent Claims (11, 12, 13, 14)
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15. A light strip for use in an edge-lit backlighting system employed with a liquid crystal display, comprising:
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a thermally conductive substrate formed in an elongated strip;
a plurality of light engines mounted at spaced intervals along said elongated strip, each of said light engines including a plurality of primary color light emitting diodes arranged in three discrete arrays, a first one of said arrays having red light emitting diodes, a second one of said arrays having green light emitting diodes and a third one of said arrays having blue light emitting diodes, a voltage being applied to each of said arrays which is separately controlled to permit independent variation of the intensity of red, blue or green light produced by respective arrays, said intensity of red, green and blue light from respective arrays being selected so that when collectively illuminated a white light of desired reference white chromaticity is produced. - View Dependent Claims (16, 17, 18)
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19. An edge-lit backlighting system for use with a liquid crystal display, comprising:
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a heat exchanger;
at least one light strip including a plurality of light engines mounted at spaced intervals therealong, each of said light engines including a plurality of primary color light emitting diodes, said light emitting diodes being selected so that when collectively illuminated a white light of desired reference white chromaticity is produced;
a light reflective sheet coupled to said at least one light strip, said light reflective sheet and said at least one light strip being mounted to said heat exchanger;
a light guide mounted in position to receive said white light produced by said at least one light strip; and
at least one enhancement film overlying said light guide. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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Specification