Patent
1991-03-05
1992-02-11
James, Andrew J.
357 60, 357 68, 357 55, 357 65, H01L 3300, H01L 931, H01L 2348, H01L 2944
Patent
active
050879499
ABSTRACT:
A transparent light-emitting diode has front and back parallel faces and a plurality of side faces perpendicular to the back face. Diagonal faces interconnect each side face with the front face to form a truncated polygonal pyramid surmounting a polygonal base of the light-emitting diode. Because some of the light impinges on the diagonal faces at an angle less than the critical angle for total internal reflection, from 1.5 to 2 times as much light is extracted from the LED as a conventional rectangular LED without the diagonal faces. The diagonal faces on the LEDs are readily made by sawing V-shaped grooves in the front face of a wafer on which the LEDs are fabricated.
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IEEE Transactions on Electron Devices, ED-24, No. 7, Jul. 1977; "A GaP Monolithic Numeric Display with Internal Reflection Facets"; pp. 979-982.
Patent Abstracts of Japan, vol. 7, NO. 123 (E-178) (1268) 27 May 1983 & JP-A-58 040872 (Nippon Denki K.K.) 09 Mar. 1983.
Hewlett--Packard Company
James Andrew J.
Meier Stephen D.
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