Backlight and display system using same
First Claim
Patent Images
1. A luminaire, comprising:
- a front reflector and a back reflector that form a light recycling cavity comprising at least one output surface; and
one or more light sources disposed to emit light into the light recycling cavity;
wherein the front reflector comprises an asymmetric reflective film, a diffuser on a first major surface of the asymmetric reflective film, and a plurality of microspheres positioned proximate a second major surface of the asymmetric reflective film;
wherein the front reflector comprises an on-axis average reflectivity of at least 90% for visible light polarized in a first plane, and an on-axis average reflectivity of at least 25% but less than 90% for visible light polarized in a second plane perpendicular to the first plane;
wherein the on-axis average reflectivity for visible light polarized in the first plane is always larger than the on-axis reflectivity for visible light polarized in the second plane.
0 Assignments
0 Petitions
Accused Products
Abstract
A backlight that includes a front reflector and a back reflector that form a hollow light recycling cavity including an output surface is disclosed. The backlight further includes one or more light sources disposed to emit light into the light recycling cavity. The front reflector includes an on-axis average reflectivity of at least 90% for visible light polarized in a first plane, and an on-axis average reflectivity of at least 25% but less than 90% for visible light polarized in a second plane perpendicular to the first plane.
-
Citations
13 Claims
-
1. A luminaire, comprising:
-
a front reflector and a back reflector that form a light recycling cavity comprising at least one output surface; and one or more light sources disposed to emit light into the light recycling cavity; wherein the front reflector comprises an asymmetric reflective film, a diffuser on a first major surface of the asymmetric reflective film, and a plurality of microspheres positioned proximate a second major surface of the asymmetric reflective film; wherein the front reflector comprises an on-axis average reflectivity of at least 90% for visible light polarized in a first plane, and an on-axis average reflectivity of at least 25% but less than 90% for visible light polarized in a second plane perpendicular to the first plane;
wherein the on-axis average reflectivity for visible light polarized in the first plane is always larger than the on-axis reflectivity for visible light polarized in the second plane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
Specification