SWEET SPOT UNIT FOR A MULTI-USER DISPLAY DEVICE WITH AN EXPANDED VIEWING ZONE

• Main Author: SCHWERDTNER ARMIN
• Format: Patent
• Language: English
• Published: 13.12.2007
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION

The invention relates to a sweet spot unit for a multiple user display with an enlarged observation area, preferably for an electronic display for reproducing stereoscopic and/or monoscopic representations which are automatically oriented towards the eyes of different observers by means of a position finder and a tracking and image control system. Said sweet spot unit contains deviation means (5), between the imaging means (3) and the image matrix, provided with deviation elements (511, 512,..51 n) which have a width (WL) and are periodically arranged in groups (L, N, R) in a matrix, vertically in accordance with the vertical screening (Hv) of the illumination matrix (1). Each group deviates the bundle of rays (91,92, 93,..) respectively at another pre-determined angle, in order to reproduce the same in one of a plurality of horizontally arranged sweet spot areas. Said sweet spot unit also contains an illumination matrix (1) comprising illumination elements that can be vertically activated according to the groups (L1N1R); optical means for vertical enlargement (7), which increase the height of the bundle of rays according to the vertical reproduction of the illumination elements; and an optically scattering medium (8) as the last element in the direction of the light upstream of the image matrix.