Optical array with improved contact structure

Details Optical array with improved contact structure Optical array with improved contact structure

2005-03-15

2005-03-15

Pham, Hai (Department: 2861)

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C347S119000, C257S081000

Reexamination Certificate

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06867795

ABSTRACT:
A high density array of light emitting diodes for visual display and imaging purposes. The array is mounted on a thermally and electrically conducting medium such as an aluminum block. The block, in one embodiment, is configured to permit a supplementary cooling liquid to be circulated through it. Typically, such LED arrays are fabricated by forming a plurality of p-type islands in n-type host semiconductor material. Each p-type island has an individually addressable contact and a common n-type contact is made to the aluminum block by, for example an electrically conductive epoxy. In operation the connection between the carrier and array may be lost due to a temperature differential between the two components. The present invention avoids this problem by providing a separate connection in parallel with or in place of the common n-type contact.

REFERENCES:
patent: 5177500 (1993-01-01), Ng et al.
patent: 5192958 (1993-03-01), Charnitski
patent: 5557115 (1996-09-01), Shakuda
patent: 5751327 (1998-05-01), De Cock et al.
patent: 5793405 (1998-08-01), Shakuda

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