Light emitting diode for harsh environments
First Claim
1. A light emitting diode for harsh environments, comprising:
- a substantially transparent substrate;
a semiconductor layer deposited on a bottom surface of the substrate;
a plurality of bonding pads, coupled to the semiconductor layer, formed on the bottom surface of the substrate;
a plurality of micro posts, formed on the bonding pads, for electrically connecting the light emitting diode to a printed circuit board; and
an underfill layer, including a polymer and a filler, disposed between the bottom surface of the substrate and a top surface of the printed circuit board, to reduce water infiltration under the substrate;
wherein the filler includes a plurality of microballoons and the polymer is cyanate ester.
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Accused Products
Abstract
A light emitting diode for harsh environments includes a substantially transparent substrate, a semiconductor layer deposited on a bottom surface of the substrate, several bonding pads, coupled to the semiconductor layer, formed on the bottom surface of the substrate, and a micro post, formed on each bonding pad, for electrically connecting the light emitting diode to a printed circuit board. An underfill layer may be provided between the bottom surface of the substrate and the top surface of the printed circuit board, to reduce water infiltration under the light emitting diode substrate. Additionally, a diffuser may be mounted to a top surface of the light emitting diode substrate to diffuse the light emitted through the top surface.
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Citations
38 Claims
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1. A light emitting diode for harsh environments, comprising:
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a substantially transparent substrate; a semiconductor layer deposited on a bottom surface of the substrate; a plurality of bonding pads, coupled to the semiconductor layer, formed on the bottom surface of the substrate; a plurality of micro posts, formed on the bonding pads, for electrically connecting the light emitting diode to a printed circuit board; and an underfill layer, including a polymer and a filler, disposed between the bottom surface of the substrate and a top surface of the printed circuit board, to reduce water infiltration under the substrate; wherein the filler includes a plurality of microballoons and the polymer is cyanate ester. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A semiconductor device for harsh environments, comprising:
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a printed circuit board having a top surface with a plurality of gold bonding pads; a light emitting diode, including; a substantially transparent substrate, a semiconductor layer deposited on a bottom surface of the substrate, a plurality of gold bonding pads, coupled to the semiconductor layer, formed on the bottom surface of the substrate, and a plurality of gold micro posts, formed on the bonding pads, bonded to the gold bonding pads of the printed circuit board; an underfill layer, including a polymer and a filler, disposed between the bottom surface of the substrate and the top surface of the printed circuit board, to reduce water infiltration under the light emitting diode substrate; and a substantially transparent, hemispherical diffuser, mounted to a top surface of the substrate, to diffuse the light emitted through the top surface of the substrate; wherein the filler includes a plurality of gas-filled, glass microballoons and the polymer is cyanate ester. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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26. An optical-based sensor for determining the presence or concentration of an analyte in a medium, said sensor comprising:
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an optically transmissive sensor body which functions as an optical wave guide, said sensor body having an outer surface surrounding said sensor body; a radiation source in said sensor body which emits radiation within said sensor body, including; a substantially transparent substrate, a semiconductor layer deposited on a bottom surface of the substrate, a plurality of bonding pads, coupled to the semiconductor layer, formed on the bottom surface of the substrate, and a plurality of micro posts, formed on the bonding pads, for electrically connecting the light emitting diode to a printed circuit board; an indicator element having an optical characteristic that is affected by the presence or concentration of an analyte, said indicator element being positioned on said sensor body to receive radiation that travels from said radiation source, and which transmits radiation into said sensor body; and a photosensitive element located in said sensor body and positioned to receive radiation within the sensor body and which emits a signal responsive to radiation received from said indicator element. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification