Patent ID: 9557466
Date: 2017-01-31
CPC Classifications: G02B,H04N

Claim:
1. A multibeam diffraction grating-based color backlight comprising: a plurality of light sources of different colors; a plate light guide to guide light of the different colors produced by the light sources, the light sources being laterally displaced from one another in a direction corresponding to a propagation axis of the guided light within the plate light guide; a multibeam diffraction grating at a surface of the plate light guide to diffractively couple out a portion of the guided light from the plate light guide as a plurality of light beams having the different colors, a light beam of the light beam plurality having a principal angular direction different from principal angular directions of other light beams of the light beam plurality, and a tilted collimator between the plurality of light sources and the plate light guide, the tilted collimator being configured to collimate and tilt light from the light sources and to direct the tilted and collimated light into the plate light guide as the guided light, wherein the tilted collimator comprises a collimating reflector configured to reflect the collimated light at a tilt angle relative to a top surface and a bottom surface of the plate light guide, and wherein a principal angular direction of a light beam of a color corresponding to a respective light source is a function of the lateral displacement of the respective light source.