Solid State Bidirectional Light Sheet Having Vertical Orientation

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.

1 - 20 . (canceled) 
     
     
         21 . A lighting device comprising:
 two or more bidirectional light sheets, each of the bidirectional light sheets having opposing first and second light emitting surfaces; and   a planar base, wherein each of the two or more bidirectional light sheets has an edge affixed to the planar base, such that the first and second light emitting surfaces of each of the bidirectional light sheets form an angle different from zero with the planar base.