HYBRID LIGHT GUIDE WITH FACETED AND HOLOGRAPHIC LIGHT TURNING FEATURES

摘要

The present disclosure provides systems, methods and apparatus to illuminate displays. In one aspect, an illumination device with a light guide can include both faceted and holographic light turning features. The holographic light turning features can be provided between the facets. The facets can eject light out of the light guide. The holographic light turning features also can eject light out of the light guide, or can collimate the light so that it propagates more nearly parallel to the major surfaces of the light guide, or both eject and collimate light. The ejected light can be used to illuminate a display.