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3D televisions with active glasses work by shutting off each
eye in rapid succession based on a pulse coming from the
TV. Due to persistence of vision, each eye sees one
continuous image, and they are collectively reconstructed
in the brain into a 3D image. Take this application and
it such that both eyes are shut off simultaneously
according to a random pulse synchronized from the
monitor. For each "on" pulse, display a random selection
of pixels from across the entire image, and for each "off"
pulse display garbage data. Over a short series of pulses,
the entire image should be displayed during the time the
display is "on". To an observer not wearing the
appropriately keyed glasses, it would just look like snow,
but to somebody with glasses that are timed to match the
"on" pulses, the display would be perfectly clear.
In addition to enhancing privacy for personal displays, this
could be used with wireless glasses to distribute
information visually to a restricted group of people in a
public space. While it's unlikely to provide much by way of
actual security--somebody could probably record all the
frames with a video camera and deduce which are the
good ones after the fact--it would still be useful for
situations where the information is only of significant
value in the short term.
"Vizio Versus" - two players using one screen
[iaoth, Feb 04 2011]
||I read about something similar to this (too complicated to find) that was even cooler and more complex.
A guy used eye tracking to follow the saccades (tiny rapid eye movements) of his eyes, and only show cleanly the actual part of the screen he was focussed on; the rest of the screen temporarily distorted. So anyone else would only see a distorted image, as their saccades wouldn't match the users.
You can also remove the front polariser from your LCD screen, and wear (correctly) polarised glasses instead. Everyone else sees a blank screen.
||Something similar exists: Vizio Versus. [link] It
uses active shutter glasses to show relevant
information to one player and hide it from the
||In addition, I remember reading about something
similar where they used an autostereoscopic
screen combined with head tracking that
essentially beams the image only in the direction
of a single viewer. It could display different images
for two viewers, even maintaining privacy if the
viewers moved or switched places.