Light emitting diode and light emitting diode array having uniform light distribution
First Claim
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1. A light emitting diode having uniform light distribution, said light emitting diode comprising:
- a substrate having a semiconductor layer of a first conduction type;
a light emitting region of a second conduction type diffused on said semiconductor layer, said light emitting region and said semiconductor layer forming a P-N junction for emitting light in a direction substantially vertical thereto;
an insulation layer formed on a portion of said semiconductor layer;
an electrode disposed on said insulation layer, adjacent to said light emitting region; and
at least two strip-like conductor portions, each including a first conductor end portion, said strip-like conductor portions being parallel to one another at a predetermined spacing and being connected to said electrode at said first conductor end portions such that said strip-like conductor portions extend over said light emitting region to establish ohmic contact with said light emitting region and to divide said light emitting region into a plurality of light emitting areas,wherein a current is supplied to said light emitting areas from said electrode via said strip-like conductor portions so that said light emitting areas emit light uniformly.
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Abstract
An LED array in which the optical output distribution in each light emitting region is as uniform as possible. An n electrode 3 is provided on the under surface of a substrate 2 and a p electrode is provided on the upper surface thereof. A multiplicity of light emitting regions 4 are formed on the upper layer of the substrate 2. Two strip-like conductor portions 6c extending over each light emitting region 4 in ohmic contact are connected to each electrode 6 so that a current is efficiently applied to the conductor portions 6c of each light emitting region 4 and the optical output distribution in each light emitting region 4 is made uniform.
126 Citations
20 Claims
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1. A light emitting diode having uniform light distribution, said light emitting diode comprising:
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a substrate having a semiconductor layer of a first conduction type; a light emitting region of a second conduction type diffused on said semiconductor layer, said light emitting region and said semiconductor layer forming a P-N junction for emitting light in a direction substantially vertical thereto; an insulation layer formed on a portion of said semiconductor layer; an electrode disposed on said insulation layer, adjacent to said light emitting region; and at least two strip-like conductor portions, each including a first conductor end portion, said strip-like conductor portions being parallel to one another at a predetermined spacing and being connected to said electrode at said first conductor end portions such that said strip-like conductor portions extend over said light emitting region to establish ohmic contact with said light emitting region and to divide said light emitting region into a plurality of light emitting areas, wherein a current is supplied to said light emitting areas from said electrode via said strip-like conductor portions so that said light emitting areas emit light uniformly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A light emitting diode having uniform light distribution, said light emitting diode comprising:
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a substrate having a semiconductor layer of a first conduction type; a light emitting region of a second conduction type diffused on said semiconductor layer, said light emitting region and said semiconductor layer forming a P-N junction for emitting light in a direction substantially vertical thereto; an insulation layer formed on a portion of said semiconductor layer; an electrode disposed on said insulation layer, partially overlapping said light emitting region; and at least two strip-like conductor portions, each including a first conductor end portion, said strip-like conductor portions being parallel to one another at a predetermined spacing and being connected to said electrode at said first conductor end portions such that said strip-like conductor portions extend over said light emitting region to establish ohmic contact with said light emitting region and to divide said light emitting region into a plurality of light emitting areas, wherein a current is supplied to said light emitting areas from said electrode via said strip-like conductor portions so that said light emitting areas emit light uniformly. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification
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Current AssigneeROHM Co., Ltd.
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Original AssigneeROHM Co., Ltd.
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InventorsOgata, Hiromi, Sawase, Kensuke
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Primary Examiner(s)Ngo, Ngan V.
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Assistant Examiner(s)Meier, Stephen D.
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Application NumberUS08/077,876Time in Patent Office711 DaysField of Search257/98, 257/99, 257/465, 257/773, 346/110 RUS Class Current257/99CPC Class CodesH01L 27/153 in a repetitive configurati...
