Optical film
Assignee3M Innovative Properties Company
InventorsEncai Hao, William Blake Kolb, Brant U. Kolb, Brian W. Ostlie, Naiyong Jing, Michael Benton Free, Hui Ren, Robert L. Brott, Fei Lu, Audrey A. Sherman, Scott M. Tapio, Charles David Hoyle, John A. Wheatley
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Abstract
Optical film is disclosed. The optical film includes a binder, a plurality of particles, and a plurality of interconnected voids. The volume fraction of the plurality of interconnected voids in the optical film is not less than about 20%. The weight ratio of the binder to the plurality of the particles is not less than about 1:2.
Claims70
An optical film comprising:
- a low effective index layer having two major surfaces and comprising:
- a binder;
- a plurality of particles;
- and
- a plurality of interconnected voids comprising surface voids at a major surface of the low effective index layer and interior voids within the interior of the low effective index layer, wherein:
- a volume fraction of the plurality of interconnected voids in the optical film is not less than about 20%, and wherein:
- a weight ratio of the binder to the plurality of the particles is not less than about 1:2, and
- wherein the low effective index layer has a thickness that is not less than about 1 micron.
An optical film comprising:
- a low effective index layer having two major surfaces and comprising:
- a binder;
- a plurality of elongated particles;
- and
- a plurality of interconnected voids comprising surface voids at a major surface of the low effective index layer and interior voids within the interior of the low effective index layer, wherein:
- a volume fraction of the plurality of interconnected voids in the low effective index layer is not less than about 20%,
- a thickness of the portion of the low effective index layer is not less than about 1 micron, and wherein:
- an optical haze of the optical film is not greater than about 1.5%.
An optical film comprising a low effective index layer having two major surfaces and comprising a plurality of particles coated and interconnected by a binder, the interconnected plurality of particles defining a plurality of interconnected voids comprising surface voids at a major surface of the low effective index layer and interior voids within the interior of the low effective index layer, the interior voids having an average size that is in a range from about 100 nm to about 300 nm, wherein the optical film has:
- a thickness of the low effective index layer that is not less than about 1 micron;
- an optical haze that is in a range from about 20% to about 70%;
- and
- an optical clarity that is not less than about 80%.
An optical film comprising:
- a low effective index layer having two major surfaces comprising:
- a plurality of elongated particles;
- and
- a plurality of voids comprising surface voids at a major surface of the low effective index layer and interior voids within the interior of the low effective index layer, wherein, the optical film has:
- an index of refraction that is not greater than about 1.3;
- a thickness of the low effective index layer that is not less than about 5 microns;
- and
- an optical haze that is not greater than about 2%.
An optical construction comprising:
- a structured surface comprising a plurality of structures, at least some of the structures having a height that is not less than about 10 microns;
- and
- an optical film comprising low effective index layer having two major surfaces and comprising a plurality of elongated particles and a plurality of voids comprising surface voids at a major surface of the low effective index layer and interior voids within the interior of the low effective index layer, the optical film coated on and substantially planarizing the structured surface, wherein the low effective index layer has a thickness that is not less than about 1 micron, the optical film comprising:
- an index that is not greater than about 1.2;
- and
- an optical haze that is not greater than about 2%.
Dependencies are inferred from the claim text.