Directional backlights with light emitting element packages
First Claim
1. A light emitting diode package for a directional display apparatus comprising:
- a body of packaging material;
at least one light generation element arranged to generate light in an emission band;
a protection diode, wherein the at least one light generation element is arranged in a first well in said body, and the protection diode is not arranged in the first well;
at least two conductive heat slugs, the at least one light generation element being located on a first one of the heat slugs, the protection diode being located on a second one of the heat slugs, and the first and second heat slugs extending underneath the first well; and
wire bonds connecting the at least one light generation element and the protection diode to the first and second heat slugs, the wire bonds that connect the at least one light generation element to the first and second heat slugs being located in the first well.
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Accused Products
Abstract
A light emitting diode package for a directional display may comprise light emitting diodes and a protection diode. The protection diode may be arranged in a well that is at a different location to the well that the light emitting diodes are arranged. The directional display may include a waveguide. The waveguide may include light extraction features arranged to direct light from an array of light sources by total internal reflection to an array of viewing windows and a reflector arranged to direct light from the waveguide by transmission through extraction features of the waveguide to the same array of viewing windows. The brightness of the directional display can be increased. An efficient and bright directional display system can be achieved. Efficient light baffling for light escaping from the edge of the waveguide is achieved through light deflecting extraction films.
117 Citations
19 Claims
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1. A light emitting diode package for a directional display apparatus comprising:
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a body of packaging material; at least one light generation element arranged to generate light in an emission band; a protection diode, wherein the at least one light generation element is arranged in a first well in said body, and the protection diode is not arranged in the first well; at least two conductive heat slugs, the at least one light generation element being located on a first one of the heat slugs, the protection diode being located on a second one of the heat slugs, and the first and second heat slugs extending underneath the first well; and wire bonds connecting the at least one light generation element and the protection diode to the first and second heat slugs, the wire bonds that connect the at least one light generation element to the first and second heat slugs being located in the first well. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A light emitting diode array for a directional display apparatus, comprising:
a first array of light emitting diode packages, each being a light emitting diode package being arrayed linearly, the light emitting diode package comprising; a body of packaging material; at least one light generation element arranged to generate light in an emission band; a protection diode, wherein the at least one light generation element is arranged in a first well in said body, and the protection diode is not arranged in the first well; at least two conductive heat slugs, the at least one light generation element being located on a first one of the heat slugs, the protection diode being located on a second one of the heat slugs, and the first and second heat slugs extending underneath the first well; and wire bonds connecting the at least one light generation element and the protection diode to the first and second heat slugs, the wire bonds that connect the at least one light generation element to the first and second heat slugs being located in the first well. - View Dependent Claims (14, 15)
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16. A directional backlight for a directional display apparatus, comprising:
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a light emitting diode array, comprising; a first array of light emitting diode packages, each being a light emitting diode package being arrayed linearly, the light emitting diode package comprising; a body of packaging material; at least one light generation element arranged to generate light in an emission band; a protection diode, wherein the at least one light generation element is arranged in a first well in said body, and the protection diode is not arranged in the first well; at least two conductive heat slugs, the at least one light generation element being located on a first one of the heat slugs, the protection diode being located on a second one of the heat slugs, and the first and second heat slugs extending underneath the first well; and wire bonds connecting the at least one light generation element and the protection diode to the first and second heat slugs, the wire bonds that connect the at least one light generation element to the first and second heat slugs being located in the first well; and wherein the directional backlight further comprises a waveguide comprising an input end arranged to receive input light from the light emitting diode array at respective input positions, first and second, opposed guide surfaces for guiding input light along the waveguide, and a reflective end for reflecting input light back through the waveguide, the second guide surface being arranged to deflect light after reflection from the reflective end as output light through the first guide surface, and the waveguide being arranged to direct the output light into optical windows in output directions that are distributed in a lateral direction in dependence on the input position of the input light. - View Dependent Claims (17, 18)
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19. A directional display apparatus comprising:
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a directional backlight, comprising; a light emitting diode array, comprising; a first array of light emitting diode packages, each being a light emitting diode package being arrayed linearly, the light emitting diode package comprising; a body of packaging material; at least one light generation element arranged to generate light in an emission band; a protection diode, wherein the at least one light generation element is arranged in a first well in said body, and the protection diode is not arranged in the first well; at least two conductive heat slugs, the at least one light generation element being located on a first one of the heat slugs, the protection diode being located on a second one of the heat slugs, and the first and second heat slugs extending underneath the first well; and wire bonds connecting the at least one light generation element and the protection diode to the first and second heat slugs, the wire bonds that connect the at least one light generation element to the first and second heat slugs being located in the first well; and wherein the directional backlight further comprises a waveguide comprising an input end arranged to receive input light from the light emitting diode array at respective input positions, first and second, opposed guide surfaces for guiding input light along the waveguide, and a reflective end for reflecting input light back through the waveguide, the second guide surface being arranged to deflect light after reflection from the reflective end as output light through the first guide surface, and the waveguide being arranged to direct the output light into optical windows in output directions that are distributed in a lateral direction in dependence on the input position of the input light; and wherein the directional display apparatus further comprises a transmissive spatial light modulator arranged to receive the output light from the first guide surface of the waveguide and to modulate it to display an image.
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Specification