Patent ID: 8192051
Filing Date: 2012-06-05
Classification: F21K,F21S,F21V,F21Y,H01L,H05K

Abstract:
1. A bidirectional lighting device for general illumination comprising: a first plurality of first non-packaged light emitting diode (LED) dies arranged to emit light in a first direction and having electrodes; a second plurality of second non-packaged light emitting diode (LED) dies arranged to emit light in a second direction different from the first direction and having electrodes; at least a first substrate and a second substrate sandwiching the first plurality and second plurality of LED dies and forming a light emitting structure having a first light emitting surface outputting light from the lighting device in the first direction and an opposing second light emitting surface outputting light from the lighting device in the 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 first plurality and the second plurality of LED dies without wires for connecting the first plurality and the second plurality of LED dies to a source of power; and wherein the first substrate and the second substrate form a bidirectional light sheet, 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; wherein the first substrate has first connection locations electrically connected to first conductors formed on the first substrate, wherein each of the first plurality and the second plurality of LED dies 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 LED die, wherein some of the first plurality and the second plurality of LED 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 first plurality and second plurality of LED 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 opposing directions from at least the primary light output surfaces of the first plurality and the second plurality of LED dies.