OPTICAL CONSTRUCTIONS INCORPORATING A LIGHT GUIDE AND LOW REFLECTIVE INDEX FILMS

摘要

Optical constructions use a low index of refraction layer disposed between a low absorption layer and a high absorption layer to increase confinement of light to the low absorption region of the optical constructions. Low index layers can be used in optical constructions that have multi-tiered light confinement. In these constructions, a first tier of reflection is provided when light is reflected at the surface of a low index optical film which is disposed directly or indirectly on a light guide. A second tier of reflection occurs at the surface of a light redirecting film having appropriately oriented refractive structures.

主权项

1. An optical construction, comprising:
a light guide having first surface and a second surface comprising a major light exit surface of the light guide; a light redirecting film; and a low index layer disposed between the light guide and the light redirecting film, the low index layer having an index of refraction not greater than 1.35, the low index layer attached to the second surface of the light guide and to the light redirecting film; wherein in the light redirecting film comprises structured features.