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How do Screen Privacy Filters Work?

2016-11-01
so there's this worry in people's minds that their internet activity is being constantly mind or spied on by the NSA their employer or their Internet service provider and while some of these concerns might be very well founded 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 economy-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 dead-on 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 micro 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's 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 degrees now although most people buy these filters as an after mark get 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 is actually useful images or text without that filter light would just come out of the monitor like blood 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 eye glass 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 want your boss knowing what you're really doing during work hours if you've been watching tech quickie for any 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