CONDUIT FOR COUPLING LIGHT SOURCE INTO THIN WAVEGUIDE FILM

摘要

This disclosure provides systems, methods and apparatus for increasing the efficiency of frontlight systems using thin waveguides. In one aspect, a narrowing reflective conduit can be used to condense light from a light source which is thicker than the waveguide, and inject it into the waveguide. A phosphor strip at the exit aperture of the narrowing reflective conduit can inject light with a diffuse directional profile independent of the directional profile of light within the narrowing reflective conduit.

主权项

1. An illumination system, comprising:
a waveguide configured to turn light propagating within the waveguide out of the waveguide; and a reflective conduit disposed adjacent an edge of the waveguide, the reflective conduit including at least:
a tapering interior section; andan opening at an end of the tapering interior section proximal the edge of the waveguide and aligned with the edge of the waveguide; a light source configured to emit light into the reflective conduit; and phosphor material disposed between the light source and the edge of the waveguide.