LED array
AssigneePhoseon Technology, Inc.
InventorsJules Braddell, Kieran Kavanagh
Life of this patent
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Abstract
An illuminator (1) has bare semiconductor die light emiting diodes (7) on pads (11) of Ag/Ni/Ti material. A Si wafer (13) has a rough upper surface, and this roughness is carried through an oxide layer (12) and the pads (11) to provide a rough but reflective upper surface of the pads (11), thus forming a diffuser. Epoxy encapsulant (9) is deposited in a layer over the diodes (7) and the pads (11), and it is index matched with a top diffuser plate (8) of opal glass.
Claims21
An illuminator comprising a substrate, semiconductor diodes placed on the substrate, an electrical drive for the diodes, a layer of encapsulant over the diodes and the substrate, and a diffuser.
A method of producing an illuminator comprising the steps of:
- providing a base layer of substrate material having a rough upper surface;
- applying a top layer of substrate reflective material over the base layer so that surface roughness of the base layer upper surface is carried through to the top layer upper surface;
- placing light emitting diodes in the form of bare semiconductor die on the substrate;
- and
- applying encapsulant over the diodes and the substrate.
Dependencies are inferred from the claim text.