Solid State Bidirectional Light Sheet Having Vertical Orientation
First Claim
1. A bidirectional lighting device for general illumination comprising:
- a first plurality of non-packaged light emitting diode (LED) dies having electrodes;
at least a first substrate and a second substrate sandwiching the LED dies and forming a light emitting structure having a first light emitting surface emitting light from the lighting device in a first direction and an opposing second light emitting surface emitting light from the lighting device in a second direction different from the first direction;
conductors formed on at least one of the first substrate and second substrate electrically connected to the electrodes of the LED dies without wires for connecting the light emitting dies to a source of power; and
wherein the first substrate and the second substrate form a bidirectional light sheet having opposing first and second light emitting surfaces, and wherein the light sheet is affixed proximate to a ceiling such that the first and second light emitting surfaces are not parallel to the ceiling, and wherein some light from the bidirectional light sheet is directed towards the ceiling and some light from the bidirectional light sheet is directed towards a floor.
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Accused Products
Abstract
A solid state, bidirectional light sheet and method of fabricating the sheet are disclosed. In one embodiment, bare LED chips have top and bottom electrodes, where the bottom electrode is a large reflective electrode. An array of LEDs (e.g., 500 LEDs) is sandwiched between at least two transparent substrates having conductors bonded to the electrodes without wires. Various ways to connect the LEDs in series are described along with various embodiments. The light sheets are formed to emit light from opposite surfaces of the light sheet to create a bidirectional light sheet. The light sheet may be suspended from a ceiling to be perpendicular to the ceiling, or the angles of the light sheet may be adjusted. The suspended light sheet may form a cylinder for uniform illumination of the floor and ceiling. Lenses may be formed in the light sheet to emit light at any peak intensity angle to achieve any light emission pattern.
125 Citations
20 Claims
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1. A bidirectional lighting device for general illumination comprising:
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a first plurality of non-packaged light emitting diode (LED) dies having electrodes; at least a first substrate and a second substrate sandwiching the LED dies and forming a light emitting structure having a first light emitting surface emitting light from the lighting device in a first direction and an opposing second light emitting surface emitting light from the lighting device in a second direction different from the first direction; conductors formed on at least one of the first substrate and second substrate electrically connected to the electrodes of the LED dies without wires for connecting the light emitting dies to a source of power; and wherein the first substrate and the second substrate form a bidirectional light sheet having opposing first and second light emitting surfaces, and wherein the light sheet is affixed proximate to a ceiling such that the first and second light emitting surfaces are not parallel to the ceiling, and wherein some light from the bidirectional light sheet is directed towards the ceiling and some light from the bidirectional light sheet is directed towards a floor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of using a bidirectional lighting device, the bidirectional lighting device comprising a bidirectional light sheet including at least a first plurality of non-packaged light emitting diode (LED) dies having electrodes, the dies being sandwiched between a transparent first substrate and a transparent second substrate, wherein light from the dies, when energized, is transmitted through opposing first and second light emitting surfaces of the light sheet, the method comprising:
orienting the light sheet relative to a ceiling such that the first and second light emitting surfaces are not parallel to the ceiling, and wherein some light from the bidirectional light sheet is directed towards the ceiling and some light from the bidirectional light sheet is directed towards a floor. - View Dependent Claims (20)
Specification