Light guide with at least partially non-transmissive coating on ledge region

摘要

This disclosure provides systems, methods and apparatus related to an illumination system for a display device. In one aspect, the illumination system includes a light guide having a view region, which directly overlies display elements of a display, and a ledge region between the view region and a light source that injects light into the light guide. The ledge region is coated with an at least partially non-transmissive layer. The layer can be at least partially absorptive and/or at least partially reflective. In some implementations, the layer can include microstructures configured to turn steep-angle light such that it is redirected across the light guide at a shallower angle. In some implementations, the boundary between the ledge region and the view region of the light guide can have a nonlinear shape.

主权项

1. An illumination system comprising:
a first light source; and a light guide including:
a first surface;a second surface opposite the first surface;a first light-input edge for receiving light from the first light source, the first light-input edge extending transverse to and between the first and second surfaces;a view region of the first and second surfaces; anda ledge region of the first and second surfaces, the ledge region including the area between the first light-input edge and the view region, wherein at least one of the first surface and the second surface within the ledge region is coated with an at least partially non-transmissive layer in the ledge region, wherein the at least partially non-transmissive layer includes a plurality of microstructures, wherein the microstructures are configured to turn incident light from the first light source such that the angle of the turned light with respect to the first surface is smaller than the angle of incidence of the light with respect to the first surface.