Patent ID: 7123287

Claim:
An autostereoscopic display system having a viewing field across which the system is capable of steering exit pupils, in each of which a viewer is capable of viewing an image for a selected eye, wherein the system comprises an image forming device for generating an image by selective attenuation of radiation, an array of lens elements for projecting radiation beams towards said image forming device, an array of radiation output positions for outputting radiation into said array of lens elements, and an array of apertures located between said lens elements and said radiation output positions, wherein a plurality of different sets of radiation output positions are provided, each different set corresponding with a different one of said lens elements and extending over a given horizontal extent, the radiation output positions being selectable such that an exit pupil is formed in a selected part of the viewing field by selection of at least one radiation output position from each of the plurality of sets of radiation output positions, wherein said array of apertures includes a plurality of apertures, each said aperture being located between a respective set of radiation output positions and the corresponding lens element and limiting the horizontal extent of a radiation beam projected towards said image forming device from the lens element after being output from one of the radiation output positions, each said aperture having a horizontal width which is less than the horizontal extent of the corresponding set of radiation output positions.