Directional backlight

摘要

A directional display may include a waveguide. The waveguide may include light extraction features arranged to direct light from an array of light sources by total internal reflection to an array of viewing windows and a reflector arranged to direct light from the waveguide by transmission through extraction features of the waveguide to the same array of viewing windows. A further spatially multiplexed display device comprising a spatial light modulator and parallax element is arranged to cooperate with the illumination from the waveguide. An efficient and bright autostereoscopic display system with low cross talk and high resolution can be achieved.

主权项

1. A directional display device comprising:
a directional backlight comprising: waveguide comprising:
first and second, opposed guide surfaces for guiding input light along the waveguide, and an array of light sources arranged to generate the input light at different input positions in a lateral direction across the waveguide, wherein the second guide surface is arranged to deflect light guided through the waveguide out of the waveguide through the first guide surface as output light, and the waveguide is arranged to direct the output light into optical windows in output directions that are distributed in a lateral direction in dependence on the input position of the input light; a transmissive spatial light modulator comprising an array of pixels arranged to receive the output light from the waveguide and to modulate it to display an image; and in series with the spatial light modulator, a parallax element arranged to direct light from pixels of the spatial light modulator into viewing windows.