So, there's this worry in people's minds that their internet activity is being
constantly mined or spied on by the NSA,
their employer, or their internet service provider. And while some of
these concerns might be very wellounded, it's important to not forget
the low tech, but no less effective method of snooping that is watching
directly over your shoulder. And while this might sound a little silly, many of
us have to deal with this when we're using our computers or devices in
environments where we can't get a lot of privacy. Roommates, nosy co-workers, or
that weirdly sweaty person next to you on your economycl class flight can all
too often see what's happening on your screen way too easily. I mean, better
viewing angles is like a selling point, right? This is where a privacy filter
can be a great investment. The basic idea behind them is to severely restrict
viewing angles to the point where you essentially have to be looking at the
screen deadon in order to see it. You've
probably seen them at the bank if you've ever tried to peek at your account balance while the teller is off getting
your cash. But how do they work? Well,
think of a window in your house with vertical blinds. If you don't have one,
pretend you do. If you turn them so they're completely open, you can see
outside fairly easily. But if you stand off to the side, the surface area of the
blinds will obscure the Windows enough to where you can barely see past them at
all. Well, privacy filters work similarly, just on a much, much smaller
scale. Some manufacturers refer to their
technology as microl louver as they use
the thinness of each individual blind as
a selling point. The thinner the blinds, the more light can pass through for the
intended user. A typical filter can contain thousands of these blinds to
enhance privacy while still making the screen relatively easy to see for
whoever is right in front of it. Typically, the filter will start to
block out screen contents once someone is looking at the display from an angle
of about 30°. Now, although most people buy these filters as an aftermarket
add-on for their computer or monitor, we're actually starting to see screens
with the technology built in, including, and this is pretty cool, the ability to
turn the filter on or off. Because even
from the front, a privacy filter does make the screen a little harder to see.
Just like looking out a window through completely open blinds still isn't the
same as having a window with nothing at all on it. So, this is a welcome change
if you've ever wanted to watch a movie with the, I don't know, not so sweaty
neighbor on the plane, which is cool. But what if you're doing some super
important like James Bond level stuff on your computer where a standard privacy
filter just won't cut it? There's actually a way to make your screen
appear blank to anyone who isn't wearing a special pair of glasses. You see,
modern LCD screens use polarizing filters to orient the light waves a
certain way, so that they come out of the screen as actual useful images or
text. Without that filter, light would just come out of the monitor like blah,
and it would be this incoherent mixture and end up appearing just plain white.
So, some intrepid do-it-yourselfers have created their own privacy monitors by
opening up their displays, removing the polarizing filter, and then cutting out
pieces of it small enough to fit into eyeglass frames. The result is that you
have a monitor that will always look plain white unless you're wearing the
special specs, which will reveal what's on screen. We actually even have a
tutorial on how to do this on our other channel right about here. And while you
shouldn't do this on a screen that you're using for gaming or other tasks
where visual quality really matters, it's perfect if you're working on a
super secret business proposal, have family members that can't keep their
eyes off your monitor, or just don't
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