Multi-user autostereoscopic display with position tracking

Autostereoscopic multi-user display having a sweet-spot unit that is direction-controlled by a tracking and image controller (160), wherein the sweet-spot unit has an illumination matrix (120,130) that includes a multitude of illumination elements these can be activated individually, and an imaging device having lens elements (111 115) for imaging alternately active illumination elements in the form of directed bundles of rays onto extended sweet-spots (SR/SL) which correspond with different eye positions (EL1/ER1, EL2/ER2), so that right and left images of a stereoscopic image sequence provided on a transmissive image display matrix (140) can be rendered visible at right/left eye positions (EL1/ER1, EL2/ER2) of observers, whereby the tracking and image controller (160) defines a direction (D2, D2, . . . or D5) for each bundle of rays (B1 B5) by activating at least one illumination element of the illumination matrix (120, 130) per eye position (EL1/ER1, EL2/ER2), lens element (111 115) and line, so that all bundles of rays (B1 B5) coinside at the position of that sweet-spot(SR/SL), wherein the imaging device comprises:

• an imaging means (110) having a multitude of lens elements (111 115) with short focal distance, so that the active illumination elements are imaged onto the sweet-spots (SR/SL) in an enlarged fashion, and
• a field lens (170) which is disposed behind the imaging means (110) in the direction of light propagation and which has a much longer focal distance than the lens elements (111 115), in order to keep constant and at a minimum the distance between adjacent bundles of rays (B1, B2, B4, B5), so that the definition of directions (D1-D5) of the bundles of rays is supported with the illumination matrix (120).