Light-emitting diode arrays and methods of manufacture
View Patent ↗A representative LED array includes: a base substrate (BS) and a plurality of light emitting diodes, each of the light emitting diodes comprising a stack of a first contact layer, a semiconductor stack and a second contact layer, the semiconductor stack being on top of the first contact layer, the second contact layer being on top of the semiconductor stack; the plurality of light emitting diodes being arranged in pixel matrix on the base substrate as LEDs of at least three types (R, G, B); the LEDs according to their type (R, G, B) being arranged as at least a first, second and third sub-pixel in the pixel matrix for emission of radiation of a respective specific at least first, second and third color; and interconnection circuitry on the substrate, operative to connect to the light emitting diodes of the array for addressing each of the light emitting diodes.
1. An LED array comprising:
a base substrate (BS) and a plurality of light emitting diodes, each of the light emitting diodes comprising a stack of a first contact layer, a semiconductor stack and a second contact layer,
the semiconductor stack being on top of the first contact layer, the second contact layer being on top of the semiconductor stack; the plurality of light emitting diodes being arranged in pixel matrix on the base substrate as LEDs of at least three types (R, G, B); the LEDs according to their type (R, G, B) being arranged as at least a first, second and third sub-pixel in the pixel matrix for emission of radiation of a respective specific at least first, second and third color,
precursor/adhesion layers on the base substrate;
light emitting diodes of at least one type of the at least three types of LEDs being directly on the base substrate, and light emitting diodes of other type(s) of the at least three types of LEDs being arranged on the precursor/adhesion layers respectively;
interconnection circuitry on the substrate, operative to connect to the light emitting diodes of the array for addressing each of the light emitting diodes; and
an overcoat layer covering the plurality of light emitting diodes and filling gaps between the plurality of light emitting diodes.
2. LED array according to claim 1 , wherein the precursor/adhesion layers are provided with characteristics that allow the formation of the light emitting diodes of said other type(s) of the at least one type of LEDs on the base substrate.
3. LED array according to claim 1 , wherein the base substrate is attached to a carrier plate; the base substrate and carrier plate forming an assembly.
4. LED array according to claim 1 , wherein the light emitting diodes of the at least one of the at least three types of LEDs are arranged with the first contact layer directly on the base substrate.
5. LED array according to claim 1 , wherein each of the precursor/adhesion layers is disposed between the first contact layer and the base substrate.
6. LED array according to claim 1 , wherein a light emitting diode comprises an adjustment layer on the second contact layer, the second contact layer being on a light output side of the light emitting diode, the adjustment layer being arranged for adjusting light output characteristics of the light emitting diode.
7. LED array according to claim 6 , wherein the adjustment layer comprises a phosphorescent layer.
8. LED array according to claim 1 , wherein the first contact layer is a negative contact layer and the second contact layer is a positive contact layer.