Privacy filter for a display device

Details Privacy filter for a display device Privacy filter for a display device

1994-11-08

1996-06-18

Coles, Sr., Edward L.

Television

Video display

Cathode-ray tube

348834, 348818, H04N 572, H04N 565

Patent

active

055283195

ABSTRACT:
A privacy filter (20) for a display device includes at least two spaced-apart, generally parallel grids (22 and 24). Each grid includes an array of strips (26 and 30) or blocking members having transparent space (28 and 32) therebetween. The strips or blocking members are formed aligned such that an image (37) displayed on the display device may be viewed through the filter at an angle of incidence within a predetermined range of angles but is not discernable at angles outside of the predetermined range.

REFERENCES:
patent: 4764410 (1988-08-01), Grzywinski
patent: 4766023 (1988-08-01), Lu
patent: 4812709 (1989-03-01), Dudasik
patent: 5179318 (1993-01-01), Maeda et al.
patent: 5254388 (1993-10-01), Melby et al.

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