Lightguide with optical film containing voids and blacklight for display system

摘要

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.

主权项

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%; anda 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.