Light-emitting diode with diagonal faces
First Claim
Patent Images
1. A transparent light-emitting diode comprising:
- an opaque back face at a back of the light-emitting diode;
a front electrical contact at the front of the light-emitting diode; and
a body of transparent semiconductor between the back and the front electrical contact having a back p-n junction substantially parallel and adjacent to the back face and remote from the front electrical contact, the body being in the form of a polygonal base adjacent to the back and having side faces perpendicular to the back p-n junction, the body also being surmounted by a truncated polygonal pyramid through the side faces of which light is emitted from the light-emitting diode, each face of the pyramid intersecting a face of the base along a line, the front electrical contact being in the truncated end of the pyramid.
5 Assignments
0 Petitions
Accused Products
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.
-
Citations
17 Claims
-
1. A transparent light-emitting diode comprising:
-
an opaque back face at a back of the light-emitting diode; a front electrical contact at the front of the light-emitting diode; and a body of transparent semiconductor between the back and the front electrical contact having a back p-n junction substantially parallel and adjacent to the back face and remote from the front electrical contact, the body being in the form of a polygonal base adjacent to the back and having side faces perpendicular to the back p-n junction, the body also being surmounted by a truncated polygonal pyramid through the side faces of which light is emitted from the light-emitting diode, each face of the pyramid intersecting a face of the base along a line, the front electrical contact being in the truncated end of the pyramid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A transparent light-emitting diode comprising:
-
a body of semiconductor material having; a back face, a front face parallel to the back face, a plurality of side faces extending away from and perpendicular to the back face, a plurality of diagonal faces interconnecting the side faces and the front face, the number of diagonal faces being the same as the number of side faces; means for making electrical contact with the front face; means for making electrical contact with the back face; and a p-n junction within a portion of the body having side faces between the back face and the intersection of the diagonal faces and the side faces for emitting light. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
-
Specification