Projection televisions with three dimensional holographic screen

Details Projection televisions with three dimensional holographic screen Projection televisions with three dimensional holographic screen

1996-12-31

2000-06-20

Britton, Howard

Television

Holographic

348 41, 348 51, 345 6, 345419, 359455, H04N 589, H04N 1500

Patent

active

060783516

ABSTRACT:
A projection television comprises a projection screen formed by a three dimensional hologram disposed on a film substrate. A projection tube has an optical path in a substantially orthogonal orientation with the screen and two other projection tubes have respective optical paths converging toward the first optical path at angles of incidence .alpha.. The hologram has a configuration effective for reducing color shift in the displayed images. The screen has a color shift less than or equal to approximately 5 for all angles .alpha., where 0.degree.<.alpha..ltoreq.30.degree., as determined by the maximum value obtained from at least one of the following expressions: ##EQU1## where .theta. is any angle within a range horizontal viewing angles, C(.theta.) is the color shift at angle .theta., red(.theta.) is the red luminance level at angle .theta., blue(.theta.) is the blue luminance level at angle .theta. and green(.theta.) is the green luminance level at angle .theta..

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