Patent
1981-05-21
1983-02-22
Wintercorn, Richard A.
G03B 2160
Patent
active
043746098
ABSTRACT:
In order to reduce changes in color balance which occur as a function of viewing angle, a 3-color projection TV system having one axial and two off-axis image projectors employs a lenticular image screen having a plurality of vertical lenticules for horizontal light distribution, all of which have the same unique optical profile. This profile is derived by starting with a location-dependent shape appropriate for a location directly in line with an off-axis image projector, in order to obtain an asymmetric profile. The minor portion of the asymmetric profile is then discarded, and replaced by a mirror image of the major portion, thus producing a lenticule profile which is symmetrical but of too coarse a pitch. That oversized profile is then scaled down to the proper pitch, and duplicated all across the breadth of the screen. The resulting screen rotates the peak exit angle of the off-axis colors into a normal angle with the screen, producing a marked reduction in color imbalance as seen from off-axis viewing locations.
REFERENCES:
patent: 3791712 (1974-02-01), Miyagi
patent: 3830556 (1974-08-01), Bratkowski
patent: 4165154 (1979-08-01), Takahashi
Wintercorn Richard A.
Zenith Radio Corporation
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