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.
