Optical array with improved contact structure
US6867795B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 2000 |
| Grant date | Mar 15, 2005 |
| Priority date | — |
| Expiry date | Nov 17, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/45
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.