IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0917319
(2010-11-01)
|
등록번호 |
US-8210716
(2012-07-03)
|
발명자
/ 주소 |
- Lerman, Louis
- York, Allan Brent
- Henry, Michael David
- Steele, Robert
- Ogonowsky, Brian D.
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
21 인용 특허 :
22 |
초록
▼
A solid state 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. The bottom electrodes of an array of LEDs (e.g., 500 LEDs) are bonded to an array of electrodes f
A solid state 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. The bottom electrodes of an array of LEDs (e.g., 500 LEDs) are bonded to an array of electrodes formed on a flexible bottom substrate. Conductive traces are formed on the bottom substrate connected to the electrodes. A transparent top substrate having conductors is then laminated over the bottom substrate. Various ways to connect the LEDs in series are described along with many embodiments. The light sheets may be formed to emit light from opposite surfaces of the light sheet, enabling it to be used in a hanging fixture to illuminate the ceiling as well as the floor. The light sheet provides a practical substitute for a standard 2×4 foot fluorescent ceiling fixture.
대표청구항
▼
1. A bidirectional lighting device comprising: a plurality of non-packaged light emitting dies having electrodes;a first transparent substrate and a second transparent substrate sandwiching the light emitting dies and forming a light emitting structure having a first light emitting surface emitting
1. A bidirectional lighting device comprising: a plurality of non-packaged light emitting dies having electrodes;a first transparent substrate and a second transparent substrate sandwiching the light emitting dies and forming a light emitting structure having a first light emitting surface emitting light from the lighting device in a first direction and a second light emitting surface emitting light from the lighting device in a second direction opposing from the first direction;first conductors formed on the first transparent substrate and second conductors formed on the second transparent substrate, the first and second connectors being electrically connected to the electrodes of the light emitting dies without wires for connecting the light emitting dies to a source of power; andan intermediate sheet between the first and second transparent substrates, the intermediate sheet having holes corresponding to locations of the dies on the transparent substrates such that each of the plurality of dies is surrounded by walls of an associated hole,wherein: each die has at least a first die electrode and a second die electrode, the first die electrode being formed on a primary light output surface of the die, and each die has sidewalls perpendicular to the primary light output surface,the first transparent substrate has first connection locations electrically connected to the first conductors, such that a first set of the plurality of dies have their first die electrode aligned with and electrically connected to an associated one of the first connection locations on the first transparent substrate without wire bonds,the second substrate has second connection locations electrically connected to the second conductors, such that a second set of the plurality of dies different from the first set have their first die electrode aligned with and electrically connected to an associated one of the second connection locations on the second substrate without wire bonds, andthe intermediate sheet has a plurality of prisms on a bottom or top surface of the intermediate sheet to reflect light emitted through side walls of the plurality of dies, the light reflected by the prisms being directed in the first and second directions and output from the bidirectional lighting device through the first and second light emitting surfaces. 2. The device of claim 1, wherein the first set of dies and the second set of dies are connected in series by the first conductors and the second conductors. 3. The device of claim 1 wherein the device is formed as a light sheet. 4. The device of claim 3 wherein the device is suspended from a ceiling so that the first light emitting surface faces the ceiling and the second light emitting surface faces away from the ceiling. 5. The device of claim 1, wherein the device is a flexible light sheet. 6. The device of claim 1, wherein the dies are vertical light emitting diodes (LEDs). 7. The device of claim 1, further comprising a wavelength conversion material that fills the holes of the intermediate sheet to encapsulate the corresponding dies and to convert light emitted through side surfaces of the dies to white light. 8. The device of claim 1, wherein at least some of the dies are connected in series by conductors internal to the device within outer boundaries of the first transparent substrate and the second transparent substrate. 9. The device of claim 1 wherein the device is part of a 2×4 foot ceiling fixture. 10. The device of claim 1, wherein the first transparent substrate, the second substrate and the intermediate sheet each have dimensions of approximately 2×4 feet. 11. The device of claim 7, further comprising a plurality of tiles formed on the first and second transparent substrates at locations corresponding to the plurality of dies, the tiles comprising a wavelength conversion material to convert light emitted through the primary light output surface of the dies. 12. The device of claim 7, further comprising a plurality of tiles formed on the first transparent substrate at locations corresponding to the dies of the first set, the tiles comprising a wavelength conversion material,wherein the device emits white light in the first direction through the plurality of tiles, and monochromatic light in the second direction through the second light emitting surface. 13. The device of claim 12, where the monochromatic light is blue light emitted by the dies. 14. The device of claim 12, where the monochromatic light is UV light emitted by the dies. 15. The device of claim 1, where a light level emitted by the device from the first light emitting surface is modulated differently from another light level emitted by the device from the second light emitting surface. 16. A bidirectional lighting device comprising: a reflective substrate having a first surface and a second surface opposing the first surface;a plurality of non-packaged light emitting dies having electrodes;a first transparent substrate sandwiching a first subset of the plurality of dies between the first surface of the reflective substrate and the first transparent substrate, an outer surface of the first transparent substrate forming a first light emitting surface of the bidirectional lighting device through which light is emitted from the bidirectional lighting device in a first direction;a second transparent substrate sandwiching a second subset of the plurality of dies between the second surface of the reflective substrate and the second transparent substrate, an outer surface of the second transparent substrate forming a second light emitting surface of the bidirectional lighting device through which light is emitted from the bidirectional lighting device in a second direction opposing the first direction;first and second conductors formed on the respective first and second surfaces of the reflective substrate connected to the electrodes of the respective first and second sets of light emitting dies without wires for connecting the plurality of light emitting dies to a source of power;a first intermediate sheet between the first and reflective substrates, the first intermediate sheet having holes corresponding to locations of the dies of the first set on the first surface of the reflective substrate, such that each of the first set of dies is surrounded by walls of an associated hole of the first intermediate sheet; anda second intermediate sheet between the second and reflective substrates, the second intermediate sheet having holes corresponding to locations of the dies of the second set on the second surface of the reflective substrate, such that each of the second set of dies is surrounded by walls of an associated hole of the second intermediate sheet,wherein each die of the first set has a primary light output surface facing the first light emitting surface of the bidirectional lighting device, and each die of the second set has the primary light output surface facing the second light emitting surface of the bidirectional lighting device, wherein each die of the first and second sets have side walls perpendicular to the primary light output surface,the electrodes of the first set of dies are electrically connected to the first conductors on the first surface of the reflective substrate without wire bonds, and the electrodes of the second set of dies are electrically connected to the second conductors on the second surface of the reflective substrate without wire bonds,the first intermediate sheet has a first plurality of prisms on a surface of the first intermediate sheet adjacent to the reflective substrate to reflect light emitted through side walls of the first set of dies, the light reflected by the first plurality of prisms being directed in the first direction and output from the bidirectional lighting device through the first light emitting surface, andthe second intermediate sheet has a second plurality of prisms on a surface of the second intermediate sheet adjacent to the reflective substrate to reflect light emitted through side walls of the second set of dies, the light reflected by the second plurality of prisms being directed in the second direction and output from the bidirectional lighting device through the second light emitting surface. 17. The device of claim 16, wherein at least some of the dies of the first set of dies are connected in series by the first conductors, and at least some of the dies of the second set of dies are connected in series by the second conductors. 18. The device of claim 16, further comprising a wavelength conversion material that fills the holes of the first and second intermediate sheets to encapsulate the corresponding dies and to convert light emitted through side surfaces of the dies to white light. 19. The device of claim 18, further comprising multiple tiles formed on the first and second transparent substrates at locations corresponding to the locations of the first and second sets of dies, the tiles comprising a wavelength conversion material to convert light emitted through the primary light output surface of the dies. 20. The device of claim 18, further comprising multiple tiles formed on the first transparent substrate at locations corresponding to the dies of the first set, the tiles comprising a wavelength conversion material,wherein the bidirectional lighting device emits white light in the first direction through the multiple tiles, and monochromatic light in the second direction through the second light emitting surface.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.