US 8,408,775 B1 · Light recycling directional control element and light emitting device using the same

Abstract

In one embodiment of this invention, an optical element comprises a light recycling directional control element and provides increased spatial color or luminance uniformity, desired angular color uniformity, and customizable light re-direction properties. In one embodiment, the optical element comprises at least one light blocking region and a lenticular lens element. Further embodiments incorporate an anisotropic light backscattering region within a light transmitting layer. The optical element may further comprise a light collimating element or an additional light lenticular lens element and light transmitting region that may be oriented parallel or perpendicular to the first lenticular lens element. Light emitting devices and displays incorporating the light recycling direction control element are further embodiments of this invention.

Claims19

Dependent claims

An optical element comprising:

a) an input surface;
b) an output surface;
c) first light transmitting regions;
d) first anisotropically backscattering regions comprising asymmetrically shaped dispersed phase domains oriented substantially parallel to a first axis dispersed in a second light transmitting material;
e) lenticular elements formed in a first light transmitting material wherein the lenticular elements comprise at least a first group of lenticular elements oriented parallel to the first axis;
f) a light transmitting layer disposed in an optical path between the input surface and the first group of lenticular elements comprising the first anisotropically backscattering regions disposed in-between the first light transmitting regions;
wherein the first anisotropically backscattering regions scatter light received from the input surface back toward the input surface in a larger angular full-width at half maximum intensity in a first plane orthogonal to the input surface and parallel to the first axis than in a second plane orthogonal to the first plane.

4 more elements

Dependencies are inferred from the claim text.

Light recycling directional control element and light emitting device using the same

Life of this patent

Light recycling directional control element and light emitting device using the same

Life of this patent

Abstract

Claims19