The present application discloses a light source comprising an LED die having an emitting surface and an optical element including a base, an apex smaller than the base, and a converging side extending between the base and the apex, wherein the base is optically coupled to and is no greater in size than the emitting surface, and wherein the optical element directs light emitted by the LED die to produce a side emitting pattern.
Edge-Lit Backlight Having Light Recycling Cavity With Concave Transflector
Craig R. Schardt - St. Paul MN, US D. Scott Thompson - Woodbury MN, US John A. Wheatley - Lake Elmo MN, US Dong Lu - Woodbury MN, US
Assignee:
3M Innovative Properties Company - St. Paul MN
International Classification:
F21S 13/14
US Classification:
362623, 362600, 362612, 362247
Abstract:
An edge-lit backlight having a light recycling cavity with concave transflector is disclosed. The edge-lit backlight has an output area and includes a back reflector facing the output area of the backlight. The backlight further includes a transflector that partially transmits and partially reflects incident light, the transflector being shaped to form a concave structure facing the back reflector to provide one or more recycling cavities therebetween, where the one or more recycling cavities substantially fill the output area of the backlight. The backlight further includes at least one light source positioned adjacent a first edge of the backlight. The at least one light source is operable to inject light into the one or more recycling cavities through an input surface of the one or more recycling cavities, where the input surface is substantially orthogonal to the output area, and where the at least one concave structure converges with the back reflector in a direction distal from the input surface.
Paul Kenneth Pickard - Morrisville NC, US Mark D. Edmond - Raleigh NC, US Dong Lu - Cary NC, US Gerald Negley - Durham NC, US Nick Nguyen - Durham NC, US Patrick John O'Flaherty - Morrisville NC, US Gary David Trott - Morrisville NC, US
Paul Kenneth Pickard - Morrisville NC, US Mark D. Edmond - Raleigh NC, US Dong Lu - Cary NC, US Gerald Negley - Durham NC, US Nick Nguyen - Durham NC, US Patrick John O'Flaherty - Morrisville NC, US Gary David Trott - Morrisville NC, US
Paul Kenneth Pickard - Morrisville NC, US Mark D. Edmond - Raleigh NC, US Dong Lu - Cary NC, US Gerald Negley - Durham NC, US Nick Nguyen - Durham NC, US Patrick John O'Flaherty - Morrisville NC, US Gary David Trott - Morrisville NC, US
Dong Lu - Woodbury MN, US Andrew Ouderkirk - Woodbury MN, US Catherine Leatherdale - St. Paul MN, US
International Classification:
H01L 33/00
US Classification:
257098000
Abstract:
In one aspect, the present application discloses a light source comprising an LED die having an emitting surface and an optical element having a base, two converging sides, and two diverging sides, wherein the base is optically coupled to the emitting surface. In another aspect, the present application discloses a light source comprising an LED die having an emitting surface and a high index optical element optically coupled to the LED die and shaped to direct light emitted by the LED die to produce a side emitting pattern having two lobes.