Solid State Light Sheet Having Wide Support Substrate and Narrow Strips Enclosing LED Dies in Series
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Abstract
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 is then formed over the bottom substrate. Various ways to connect the LEDs in series are described along with many embodiments. In one method, the top substrate contains a conductor pattern that connects to LED electrodes and conductors on the bottom substrate.
84 Citations
43 Claims
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1-20. -20. (canceled)
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21. An illumination device comprising:
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a light-emitting element, the light-emitting element comprising; a non-packaged light-emitting diode (LED) die having a top electrode and a bottom electrode formed on opposite surfaces of the LED die; a cup including an indentation, the indentation having substantially the same height as the LED die and at least a reflective surface, wherein the LED die is disposed in the indentation; a transparent top substrate having a first surface and a second surface opposing the first surface, wherein the first surface of the top substrate faces the light-emitting element; and first electrical conductors disposed on the first surface of the top substrate such that the top electrode of the LED die is in contact with the first electrical conductors, wherein the first electrical conductors are configured to provide power to the LED die. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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Specification