US 2002/0096985 A1 · Holographic privacy filter for display devices

Abstract

A privacy filter for use on an electronic display screen, such as a PDA display screen or a laptop display screen, is constructed using holographic imaging technology. The privacy filter consists of a flexible, optically clear photopolymer film having a plurality of holographic images formed thereon. The key aspect of the present disclosure is constructing the master holographic images by imaging the master holographic recording plates at a severe side angle “off angle”. By shooting the hologram at this “off angle”, the resulting hologram is not visible to a person looking directly (perpendicularly) at the resulting hologram. However, the holograms are visible within the remaining fields of view to the right and to the left of center. Creation of the holograms in this manner creates an effective blocking tool for use in the context of a privacy filter. Unwanted onlookers attempting to view the display screen from the sides, the front or the back are presented with a holographic image rather than a view of the display.

Claims48

Dependent claims

A privacy filter for use on an electronic display screen comprising:

a flexible sheet of photopolymer film having a 180 degree field of view perpendicular to a first side of said sheet,
said sheet of photopolymer film having at least one holographic image exposed thereon wherein
said at least one holographic image is not visible within a central field of view, and
said at least one holographic image is visible within left and right holographic fields of view disposed to the left and right sides of said central field of view.

1 more element

A method of constructing a holographic privacy filter for use on an electronic display comprising the steps of:

a. providing a first holographic recording plate;
b. directing a reference beam onto the holographic recording plate;
c. directing an image beam onto the holographic recording plate at an angle of between about 50 degrees and about 60 degrees from a centerline extending perpendicular to said surface of said holographic recording plate, whereby a 1st generation master holographic interference pattern is formed on said plate;
d. repeating steps a, b, and c, a plurality of times to thereby produce a plurality of individual 1st generation master plates;
e. assembling said plurality of master plates in side by side relation to form a composite template of said privacy filter;
f. providing a mask having a plurality of predetermined two-dimensional designs formed therein;
g. aligning said mask over said plurality of assembled 1st generation master plates so that each of said plurality of designs is in registered alignment with a corresponding one of each of said 1st generation master plates;
h. providing a second holographic recording plate;
h. duplicating said assembly of said 1st generation master plates onto said holographic plate to form a 2nd generation master plate that includes said two-dimensional designs;
and
l. exposing said 2nd generation master onto a sheet of photopolymer film to create a plurality of individual holographic images on said photopolymer film,
each of said plurality of holographic images having an off center field of view.

9 more elements

Dependencies are inferred from the claim text.

Holographic privacy filter for display devices

Life of this patent

Holographic privacy filter for display devices

Life of this patent

Abstract

Claims48