Light source utilizing diffusive reflective cavity
First Claim
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1. A lighting apparatus, comprising:
- a device that emits light;
an optical cavity formed by diffusely reflective surfaces, said cavity having an aperture through which light from said cavity passes;
said light emitting device being mounted to supply light to said cavity while being hidden from direct view through said aperture, said cavity having a diffusely reflective surface area and said aperture having an area, the ratio of said area of said aperture to the sum of (i) said area of said aperture and (ii) said diffusely reflective surface area of said cavity being at least 0.20; and
a planar optical apparatus at said aperture comprised of replicated structures configured to restrict light output from said aperture to a predetermined viewing angle.
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Abstract
A light source for backlighting a display comprises a light-emitting device such as an incandescent bulb or LED array disposed within a cavity having diffusely reflecting walls and an aperture. A diffuser and brightness enhancing film are situated at the opening of the aperture between the aperture and the display to be backlit. A color filter may also be employed to whiten the light emerging from the light source.
205 Citations
18 Claims
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1. A lighting apparatus, comprising:
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a device that emits light; an optical cavity formed by diffusely reflective surfaces, said cavity having an aperture through which light from said cavity passes; said light emitting device being mounted to supply light to said cavity while being hidden from direct view through said aperture, said cavity having a diffusely reflective surface area and said aperture having an area, the ratio of said area of said aperture to the sum of (i) said area of said aperture and (ii) said diffusely reflective surface area of said cavity being at least 0.20; and a planar optical apparatus at said aperture comprised of replicated structures configured to restrict light output from said aperture to a predetermined viewing angle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification