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1. (WO2013116623) BIDIRECTIONAL LIGHT SHEET
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CLAIMS

What is claimed is:

1. A bidirectional lighting device comprising:

a first plurality of non-packaged light emitting dies having electrodes;

wherein the light emitting dies each have a thickness less than 85 microns;

at least a first substrate and a second 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 an opposing second light emitting surface emitting light from the lighting device in a second direction different from the first direction; and

conductors formed on the at least first substrate and second substrate electrically connected to the electrodes of the light emitting dies without wires for connecting the light emitting dies to a source of power.

2. The device of claim 1 wherein,

the first substrate has first connection locations electrically connected to first conductors formed on the first substrate, 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, wherein

some of the dies have their first die electrode aligned with and electrically connected to an associated one of the first connection locations on the first substrate without wire bonds, wherein

the second substrate has second connection locations electrically connected to second conductors formed on the second substrate, wherein

other ones of the dies 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, and wherein

the first substrate and the second substrate have light output surfaces for emitting light in different directions from at least the primary light output surfaces of the dies.

3. The device of any proceeding claim further comprising an intermediate layer between the first substrate and the second substrate.

4. The device of any proceeding claim wherein the first substrate and the second substrate directly contact each other with no intermediate layer between them.

5. The device of any proceeding claim wherein at least some of the dies are connected in series by the first conductors and the second conductors.

6. The device of any proceeding claim wherein the at least some of the dies are connected in series by the first conductors and the second conductors interconnecting the first die electrodes to the second die electrodes.

7. The device of any proceeding claim further comprising:

an intermediate layer over the first substrate, the intermediate layer having holes corresponding to locations of the dies on the first substrate such that the dies are surrounded by walls of an associated hole,

wherein the plurality of dies are sandwiched between the first substrate and the second substrate, with the intermediate layer there between, wherein portions of the first conductors and portions of the second conductors connect at least some of the dies in series without using wire bonds.

8. The device of any proceeding claim further comprising at least third substrate sandwiched between the first substrate and the second substrate, the third substrate having a reflective layer for reflecting light out through the first substrate and the second substrate.

9. The device of any proceeding claim wherein the third substrate has third conductors formed on its surface

for interconnecting at least some of the dies in series.

10. The device of any proceeding claim further comprising a reflective layer between the first substrate and the second substrate, wherein some of the dies are located between the reflective layer and a light output surface of the first substrate, and other ones of the dies are located between the reflective layer and a light output surface of the second substrate.

11. The device of any proceeding claim wherein the device is formed as a light sheet.

12. The device of any proceeding claim 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.

13. The device of any proceeding claim wherein the device is a flexible light sheet having transparent opposing light emitting surfaces.

14. The device of any proceeding claim further comprising a wavelength conversion material provided on or in the device for converting light emitted from the dies to white light.

15. The device of any proceeding claim wherein at least some of the dies are connected in series by the conductors internal to the device within outer boundaries of the first substrate and the second substrate.