Front projection screens including reflective and refractive layers of differing spatial frequencies, and methods of fabricating same
First Claim
Patent Images
1. A projection screen comprising:
- a substrate;
a reflective layer on the substrate, the reflective layer comprising reflective microstructures of about 0.5 μ
m to about 500 μ
m in size and arranged in a first pattern to reflect light at a first spatial frequency; and
a refractive layer on the substrate, the refractive layer comprising refractive microstructures of about 0.5 μ
m to about 500 μ
m in size and arranged in a second pattern that is different from the first pattern to refract light at a second spatial frequency that is different than the first spatial frequency.
3 Assignments
0 Petitions
Accused Products
Abstract
Projection screens include a substrate, a reflective layer on the substrate and a refractive layer on the substrate. The reflective layer includes reflective microstructures of about 5 μm to about 500 μm in size, and arranged in a first pattern to reflect light at a first spatial frequency. The refractive layer includes refractive microstructures of about 5μm to about 500μm in size, and arranged in a second pattern that is different from the first pattern, to refract light at a second spatial frequency that is different than the first spatial frequency. Related fabrication methods also are described.
-
Citations
23 Claims
-
1. A projection screen comprising:
-
a substrate;
a reflective layer on the substrate, the reflective layer comprising reflective microstructures of about 0.5 μ
m to about 500 μ
m in size and arranged in a first pattern to reflect light at a first spatial frequency; and
a refractive layer on the substrate, the refractive layer comprising refractive microstructures of about 0.5 μ
m to about 500 μ
m in size and arranged in a second pattern that is different from the first pattern to refract light at a second spatial frequency that is different than the first spatial frequency. - View Dependent Claims (4, 5, 6, 12, 13, 15, 16)
-
- 2. A projection screen according to claim I wherein the projection screen has a front and a back and wherein the reflective layer and the refractive layer are arranged on the substrate such that light that is projected to the front of the projection screen passes through and is refracted by the refractive layer to impinge on the reflective layer and is reflected from the reflective layer back through the refractive layer to emerge from the front of the projection screen.
-
14. (canceled)
-
17. A projection screen comprising:
-
a substrate including a reflective metal face having a textured surface to provide reflective microstructures of about 0.5 μ
m to about 500 μ
m in size and arranged in a first pattern to reflect light at a first spatial frequency; and
an array of refractive microstructures of about 0.5 μ
m to about 500 μ
m in size on the textured surface and arranged in a second pattern that is different from the first pattern to refract light at a second spatial frequency that is different than the first spatial frequency. - View Dependent Claims (18)
-
-
19. A projection screen comprising:
-
a transparent substrate having front and back faces;
a first array of refractive microstructures of about 0.5 μ
m to about 500 μ
m in size on the front face, and arranged in a first pattern to refract light at a first spatial frequency;
a second array of refractive microstructures of about 0.5 μ
m to about 500 μ
m in size on the back face, and arranged in a second pattern that is different from the first pattern to refract light at a second spatial frequency that is different than the first spatial frequency; and
a reflective layer that extends conformally on the second array of microstructures to provide an array of reflective microstructures of about 0.5 μ
m to about 500 μ
m in size on the back face, and arranged in the second pattern to reflect light at the second spatial frequency. - View Dependent Claims (20)
-
-
21. A method of fabricating a projection screen comprising:
-
texturing a surface of a reflective metal substrate;
arranging a mold of microlenses adjacent the surface that was textured, with liquid photopolymer between the mold and the surface that was textured, to thereby mold the microlenses in the liquid photopolymer;
photocuring the liquid photopolymer; and
removing the mold. - View Dependent Claims (22, 23)
-
Specification