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Currently there are a few
different transparent display
technologies and each of them is
suitable for a different set of
applications. These include
organic transparent displays,
reflecting displays as well as
fluorescent displays. What we're
trying to achieve is something
that is particularly simple to
implement and is fairly cheap
and scaleable. So typically you
either project images onto a
white piece of wall which does
the purpose because it scatters
light but it is not transparent;
light cannot go through. Or you
have a piece of glass where light
goes through but you cannot
project any images onto it. So
if we can actually project images
onto glasses then it will enable
much more opportunities. For
example you can now project
onto a window of a store so I
can display information of the
products inside. Or you can
project images onto an office
window or on the windows of
subway trains. So the way we
went to implement this is we
embedded resonant nano-particles
into a polymer. So you can think
of it as a plastic foil and
these nano-particles are
implemented such that they
reflect only certain, particular
colors. In our case, the one
that we demonstrated was a blue
color. So it will strongly
reflect that particular color
but all the other colors will go
through. Therefore our
transparent screen is simply a
sheet of transparent plastic
with some nano-particles in it.
And you can take this sheet of
plastic and put it onto a glass
and then this glass will still
be transparent but you will be
able to project images onto it.
For the future we plan to make
the screen even more transparent
for the colors that we do not
target. And also we plan to
extend this method so that it
can display multiple colors,
specifically red, green and blue
so that you will be able to show
a full color image. Since this
is a relatively simple method
and it is really cheap to make
these plastic foils that display,
we can envision that in the
future people will just go to
convenience stores to buy this
piece of plastic, go home
and just put it onto their
windows or wherever they want to
project images and then will
be able to turn that transparent
glass into something useful
that can display.