Liquid crystal cells – elements and systems – Liquid crystal system – Stereoscopic
Reexamination Certificate
2004-12-17
2008-11-11
Font, Frank G (Department: 2883)
Liquid crystal cells, elements and systems
Liquid crystal system
Stereoscopic
C349S001000, C349S095000, C355S022000, C356S012000, C359S376000
Reexamination Certificate
active
07450188
ABSTRACT:
An autostereoscopic multi-user display comprising a sweet-spot unit which is directionally controlled by a tracking and image control device (160), wherein an illumination matrix (120) is provided with separately activatable illuminating elements (11 . . . 56), in addition to an imaging device used to alternatingly image active illuminating elements, for making expanded sweet spots (SR1/SR2) visible to various eye positions (EL1/ER1, EL2/ER2) of viewers observing alternating images or a stereoscopic image sequence on a transmissive image matrix (140) with the aid of directed beams (B1R . . . B5L). According to the invention, the imaging device comprises an imaging matrix (110) provided with a plurality of lens elements (111 115) whose focal length is small in order to image the active illuminating elements in an enlarged manner onto the sweet spots (SR1/SR2), and a field lens (171), which follows the imaging matrix (110), in order to keep the distances of the activated illuminating elements between adjacent beams (B1, B2,B4, B5) as constant as possible and in order to assist selection of the directions (D1. . . D5) with the illumination matrix (120) for the beams.
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Font Frank G
Lam Hung
Saul Ewing LLP
SeeReal Technologies GmbH
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