LAMP-HIDING ASSEMBLY FOR A DIRECT LIT BACKLIGHT
First Claim
1. An optical assembly comprising:
- a reflector having an internal Brewster angle; and
a reflective polarizer having orthogonal reflection and transmission axes.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention is applicable to optical assemblies for use with direct-lit backlights that exhibit a lower transmission for light of normal incidence as compared to the transmission of light at higher angles of incidence, to accomplish a leveling effect of the light across the display. In one embodiment, an optical assembly includes a reflector having an internal Brewster angle and a reflective polarizer having orthogonal reflection and transmission axes. In another embodiment, a direct lit backlight assembly includes one or more lamps, a reflector having an internal Brewster angle, where a major surface of the reflector is facing at least one of the one or more lamps, and a light redirecting layer.
31 Citations
27 Claims
-
1. An optical assembly comprising:
-
a reflector having an internal Brewster angle; and a reflective polarizer having orthogonal reflection and transmission axes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A direct lit backlight assembly comprising:
-
one or more lamps; a reflector having an internal Brewster angle, wherein a major surface of the reflector is facing at least one of the one or more lamps; and a light redirecting layer. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
-
-
26. An optical assembly comprising:
-
one or more lamps; a display panel; a reflector having an internal Brewster angle, wherein the reflector is a multilayer interference film of at least three layers, wherein at least one of the layers is birefringent, wherein a refractive index in the x-direction (nx) is less than a refractive index in the z-direction (nz), where the x-direction is an in-plane direction, wherein the reflector is located between the lamps and the display panel.
-
-
27. An optical assembly comprising:
a backlight reflector having a smooth side, wherein the reflector has an internal Brewster angle of less than 90 degrees in air, wherein the internal reflectivity inside the film for one polarization is zero for a certain angle;
wherein the reflector has a reflectance of 50% or greater at normal incidence.
Specification