Lightguide with optical film containing voids and blacklight for display system
First Claim
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1. A lightguide comprising:
- a light guiding layer for propagating light by total internal reflection; and
a first optical film disposed on the light guiding layer and comprising;
a binder, a plurality of particles, and a plurality of interconnected voids;
an optical haze that is not less than about 30%; and
a porosity that is not less than about 20%; and
a reflective polarizer layer disposed on the first optical film, wherein the reflective polarizer layer has a first average reflectance for visible light polarized in a first plane, and a second average reflectance for visible light polarized in a second plane orthogonal to the first plane, the first average reflectance being greater than the second average reflectance;
wherein substantial portions of each two neighboring major surfaces in the lightguide are in physical contact with each other.
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Abstract
Lightguide is disclosed. The lightguide includes a light guiding layer for propagating light by total internal reflection, and an optical film that is disposed on the light guiding layer. The optical film includes a plurality of voids, an optical haze that is not less than about 30%, and a porosity that is not less than about 20%. Substantial portions of each two neighboring major surfaces in the lightguide are in physical contact with each other.
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Citations
27 Claims
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1. A lightguide comprising:
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a light guiding layer for propagating light by total internal reflection; and a first optical film disposed on the light guiding layer and comprising; a binder, a plurality of particles, and a plurality of interconnected voids; an optical haze that is not less than about 30%; and a porosity that is not less than about 20%; and a reflective polarizer layer disposed on the first optical film, wherein the reflective polarizer layer has a first average reflectance for visible light polarized in a first plane, and a second average reflectance for visible light polarized in a second plane orthogonal to the first plane, the first average reflectance being greater than the second average reflectance; wherein substantial portions of each two neighboring major surfaces in the lightguide are in physical contact with each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification