Optical: systems and elements – Projection screen
Reexamination Certificate
2005-03-22
2005-03-22
Perkey, W. B. (Department: 2851)
Optical: systems and elements
Projection screen
C353S037000, C353S122000, C348S804000, C385S901000
Reexamination Certificate
active
06870671
ABSTRACT:
A flat-panel display comprises a projector (21-23) illuminated by a collimate light source such as an infra-red laser, a waveguide (1) which ejects rays at a distance along the axis of propagation related to their angle of injection into the edge of the waveguide, an input slab (3) for magnifying the projected image in the width dimension in the plane of the panel perpendicular to the axis of propagation, and a phosphor output screen which converts the infra-red light to the visible. The use of monochromatic light within the waveguide reduces dispersion problems, and the use of a triad of projectors, each injecting at a different angle, makes registration relatively simple.
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Alexandra Rapaport, Ferenc Szipocs, Janet Milliez, Hans Jenssen and Michael Bass; “Optically Written Displays Based on Up-Conversion of Near Infrared Light”.
Cambridge 3D Display Limited
Garvey, Smith, Nehrbass & Doody LLC
Smith Gregory C.
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