Patent ID: 8248560
Filing Date: 2012-08-21
Classification: F21V,G02B

Abstract:
1. A display apparatus comprising; an array of light modulators defining a display surface; a light guide having front and rear surfaces and a plurality of geometric light redirectors, the plurality of geometric light redirectors being arranged to reflect light into a useful range of angles about a display axis perpendicular to the display surface, the light originating from one or more light sources; a rear-facing plurality of prisms; a front-facing plurality of prisms; and each of the rear-facing and front-facing plurality of prisms being located between the light guide and the display surface while being arranged to redirect the reflected light from the geometric light redirectors towards the display surface such that the reflected light remains within the useful range of angles, wherein the light is reflected such that the intensity of the redirected light within the useful range of angles about the display axis is at least 50% of an initial total light intensity.