Light-emitting diode array with projections
First Claim
1. A light-emitting diode array comprising:
- a multiplicity of light-emitting diodes arrayed on a single substrate, each light-emitting diode having an active layer which emits light when subjected to carrier injection, and an optical output surface;
projections on said optical output surface for reflection prevention so as to limit reflection of light from the active layer; and
a reflective mirror between the substrate and the active layer.
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Accused Products
Abstract
A light-emitting diode array having improved optical output efficiency and uniformity without loss of reliability or reproducibility is described. The array is formed of an n-type conductivity GaAs buffer layer on an n-type conductivity GaAs substrate, followed by 25-pair n-type conductivity Aly Ga1-y As/AlAs semiconductor multilayer mirror, a p-type conductivity Alx Ga1-x As active layer, and a p++ type conductivity GaAs contact layer. The surface of the emission region is a total reflection prevention surface with a sawtooth-shaped projection configuration. This provides a large decrease in total reflection loss of light from the emission layer, and also enables light propagating in the opposite direction to the output surface to be efficiently outputed.
149 Citations
23 Claims
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1. A light-emitting diode array comprising:
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a multiplicity of light-emitting diodes arrayed on a single substrate, each light-emitting diode having an active layer which emits light when subjected to carrier injection, and an optical output surface; projections on said optical output surface for reflection prevention so as to limit reflection of light from the active layer; and a reflective mirror between the substrate and the active layer. - View Dependent Claims (2, 3, 4)
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5. A light-emitting diode array comprising:
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a substrate of one conductivity type having a surface; spaced light-emitting elements on said surface of the substrate; each of said light-emitting elements comprises an active layer of a conductivity type opposite that of the substrate and a light emitting surface; a mirror between each of the active layers and the substrate; and projections on the light-emitting surface of each of the light-emitting elements to prevent reflection of the light. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification