Backlight wedge with adjacent reflective surfaces

摘要

A backlight includes a visible light transmissive body having a light guide portion and a light input portion. The visible light transmissive body primarily propagates light by TIR and includes a light input surface and a light output surface. The light guide portion has a light reflection surface and a light emission surface. The light input portion has opposing side surfaces that are not parallel. A light source is disposed adjacent to the light input surface and emits light into the light input portion. A specularly reflective layer is disposed adjacent to but not in intimate contact with the opposing side surfaces and reflects more than 80% of visible light incident on the specularly reflective layer.

主权项

1. An illumination assembly comprising:
a solid body visible light transmissive diverging wedge defined by a narrow end surface and a wide end surface, and opposing side surfaces that are not parallel and extend between the narrow end and the wide end; a linear array of solid state light sources disposed adjacent to the narrow end surface, the light sources emitting light into the narrow end surface of the diverging wedge, the solid body having a uniform cross-section along the linear array of solid state light sources; a specularly reflective film disposed proximate to each of the opposing side surfaces, reflecting more than 95% of visible light incident on specularly reflective film; and an air gap between the specularly reflective film and the opposing side surfaces, wherein the diverging wedge primarily propagates light by TIR .