OPTICAL CONSTRUCTIONS INCORPORATING LIGHT GUIDE AND LOW REFRACTIVE INDEX FILMS

摘要

PROBLEM TO BE SOLVED: To provide optical constructions capable of reducing the cost of light sources, reducing the number of components in the light sources, and making the light sources thinner and more efficient.SOLUTION: Optical constructions use a low index of refraction layer (120) disposed between a low absorption layer (101) and a high absorption layer (103) to increase confinement of light to the low absorption region of the optical constructions. Low refractive 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 refractive index optical film which is disposed directly or indirectly on a light guide (110). A second tier of reflection occurs at the surface of a light redirecting film having appropriately oriented refractive structures.SELECTED DRAWING: Figure 1A