WEBVTT 00:00:00.080 --> 00:00:08.160 So, there's this worry in people's minds that their internet activity is being 00:00:04.400 --> 00:00:09.760 constantly mined or spied on by the NSA, 00:00:08.160 --> 00:00:14.280 their employer, or their internet service provider. And while some of 00:00:11.920 --> 00:00:19.520 these concerns might be very wellounded, it's important to not forget 00:00:17.199 --> 00:00:24.960 the low tech, but no less effective method of snooping that is watching 00:00:22.000 --> 00:00:29.119 directly over your shoulder. And while this might sound a little silly, many of 00:00:27.359 --> 00:00:33.000 us have to deal with this when we're using our computers or devices in 00:00:31.119 --> 00:00:39.280 environments where we can't get a lot of privacy. Roommates, nosy co-workers, or 00:00:36.719 --> 00:00:44.000 that weirdly sweaty person next to you on your economycl class flight can all 00:00:41.760 --> 00:00:49.920 too often see what's happening on your screen way too easily. I mean, better 00:00:47.840 --> 00:00:54.559 viewing angles is like a selling point, right? This is where a privacy filter 00:00:52.239 --> 00:00:59.440 can be a great investment. The basic idea behind them is to severely restrict 00:00:57.440 --> 00:01:04.000 viewing angles to the point where you essentially have to be looking at the 00:01:00.960 --> 00:01:05.519 screen deadon in order to see it. You've 00:01:04.000 --> 00:01:12.240 probably seen them at the bank if you've ever tried to peek at your account balance while the teller is off getting 00:01:08.400 --> 00:01:14.320 your cash. But how do they work? Well, 00:01:12.240 --> 00:01:19.280 think of a window in your house with vertical blinds. If you don't have one, 00:01:16.720 --> 00:01:24.159 pretend you do. If you turn them so they're completely open, you can see 00:01:21.759 --> 00:01:29.200 outside fairly easily. But if you stand off to the side, the surface area of the 00:01:26.720 --> 00:01:34.159 blinds will obscure the Windows enough to where you can barely see past them at 00:01:31.600 --> 00:01:40.159 all. Well, privacy filters work similarly, just on a much, much smaller 00:01:37.119 --> 00:01:43.280 scale. Some manufacturers refer to their 00:01:40.159 --> 00:01:46.320 technology as microl louver as they use 00:01:43.280 --> 00:01:49.119 the thinness of each individual blind as 00:01:46.320 --> 00:01:54.079 a selling point. The thinner the blinds, the more light can pass through for the 00:01:51.520 --> 00:01:59.040 intended user. A typical filter can contain thousands of these blinds to 00:01:56.640 --> 00:02:03.280 enhance privacy while still making the screen relatively easy to see for 00:02:01.200 --> 00:02:07.360 whoever is right in front of it. Typically, the filter will start to 00:02:05.119 --> 00:02:11.760 block out screen contents once someone is looking at the display from an angle 00:02:09.039 --> 00:02:16.080 of about 30°. Now, although most people buy these filters as an aftermarket 00:02:13.760 --> 00:02:20.400 add-on for their computer or monitor, we're actually starting to see screens 00:02:18.000 --> 00:02:25.840 with the technology built in, including, and this is pretty cool, the ability to 00:02:22.400 --> 00:02:28.400 turn the filter on or off. Because even 00:02:25.840 --> 00:02:32.800 from the front, a privacy filter does make the screen a little harder to see. 00:02:30.959 --> 00:02:36.560 Just like looking out a window through completely open blinds still isn't the 00:02:34.879 --> 00:02:40.959 same as having a window with nothing at all on it. So, this is a welcome change 00:02:39.200 --> 00:02:45.360 if you've ever wanted to watch a movie with the, I don't know, not so sweaty 00:02:42.879 --> 00:02:49.680 neighbor on the plane, which is cool. But what if you're doing some super 00:02:47.360 --> 00:02:53.840 important like James Bond level stuff on your computer where a standard privacy 00:02:51.840 --> 00:02:57.840 filter just won't cut it? There's actually a way to make your screen 00:02:55.120 --> 00:03:02.800 appear blank to anyone who isn't wearing a special pair of glasses. You see, 00:03:00.560 --> 00:03:06.560 modern LCD screens use polarizing filters to orient the light waves a 00:03:04.640 --> 00:03:10.720 certain way, so that they come out of the screen as actual useful images or 00:03:08.400 --> 00:03:14.400 text. Without that filter, light would just come out of the monitor like blah, 00:03:12.560 --> 00:03:19.440 and it would be this incoherent mixture and end up appearing just plain white. 00:03:16.800 --> 00:03:24.480 So, some intrepid do-it-yourselfers have created their own privacy monitors by 00:03:22.159 --> 00:03:28.640 opening up their displays, removing the polarizing filter, and then cutting out 00:03:26.720 --> 00:03:32.959 pieces of it small enough to fit into eyeglass frames. The result is that you 00:03:31.200 --> 00:03:36.799 have a monitor that will always look plain white unless you're wearing the 00:03:34.879 --> 00:03:40.080 special specs, which will reveal what's on screen. We actually even have a 00:03:38.159 --> 00:03:45.040 tutorial on how to do this on our other channel right about here. And while you 00:03:43.120 --> 00:03:49.040 shouldn't do this on a screen that you're using for gaming or other tasks 00:03:47.120 --> 00:03:53.120 where visual quality really matters, it's perfect if you're working on a 00:03:50.799 --> 00:03:57.680 super secret business proposal, have family members that can't keep their 00:03:54.560 --> 00:03:59.280 eyes off your monitor, or just don't 00:03:57.680 --> 00:04:03.760 want your boss knowing what you're really doing during work hours. If 00:04:01.920 --> 00:04:08.239 you've been watching Techquiki for any reasonable period of time, you've 00:04:05.280 --> 00:04:12.799 probably heard of Dollar Shave Club. 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