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Speaker 1: slash tech Stuff. Hi there, everybody, Welcome to tech Stuff.
Speaker 1: My name is Chris Polette. I'm an editor at how
Speaker 1: Stuff Works. Sitting next to me, as usual, is senior
Speaker 1: writer Jonathan Strickland. Hey there, it's good to see you all,
Speaker 1: except we can't see you and you can't see us.
Speaker 1: But you know, there's always that other medium on which
Speaker 1: we're not. But I think the public is familiar with
Speaker 1: the This is as smooth as it. I'm just tripping.
Speaker 1: All Okay, you know what, I'm gonna just take over
Speaker 1: from here. Okay, all right, So we're gonna talk about
Speaker 1: television's HDTV S fly panels. Specifically, we're gonna talk about
Speaker 1: l C D s versus plasma displays. And if if
Speaker 1: you're like me, you know, if you've ever gone into
Speaker 1: an electronics store and you see that huge wall of televisions.
Speaker 1: You may wonder, like, all right, well, I see there's
Speaker 1: some of them are plasma, some of them are l
Speaker 1: c D. What's the difference, doesn't doesn't make a difference, Um,
Speaker 1: And what's the best choice for me? And which one
Speaker 1: can I afford and can have installed in my house
Speaker 1: later this afternoon. Which one's gonna allow me to have
Speaker 1: the largest possible TV for the least amount of money.
Speaker 1: That's usually the way I go. That's I don't think, no, no,
Speaker 1: I think that's pretty common. But of course there are
Speaker 1: other things to take into consideration, like bigger is not
Speaker 1: always better. For one thing, you want to make sure
Speaker 1: you have the best picture quality and you want to
Speaker 1: you know, there it also depends on what kind of
Speaker 1: stuff you like to watch on television, because some displays
Speaker 1: are better at showing certain kinds of action than others. Well, um,
Speaker 1: I guess then it comes down to what kind of
Speaker 1: technology will do that for you. And you know, most
Speaker 1: of us grew up with crt s, the cathode ray tube. Um,
Speaker 1: those are the bigger TVs that certainly not flat panel,
Speaker 1: but you know they had a pretty good picture because
Speaker 1: they were using an electron gun to illuminate phosphors in
Speaker 1: the back of the TV screen and that produced a
Speaker 1: really clear picture. And and in fact, there's some techno
Speaker 1: files who would argue that they still provide the best picture,
Speaker 1: that the picture from one of those sets, like an
Speaker 1: HD TV set that's uses that that technology is actually
Speaker 1: superior to plasma or l c D, but they don't
Speaker 1: really make a whole lot of HD cathode ray tube sets,
Speaker 1: and that they're giants there. Yeah, there's a lot of
Speaker 1: space exactly, And and that's that's part of the issue here,
Speaker 1: is that once people started seeing these flat panel displays,
Speaker 1: you know, they're really sexy and sleek, and you know,
Speaker 1: you can just imagine having this really kind of high
Speaker 1: tech looking entertainment center with this as the centerpiece. Um
Speaker 1: that's got a very you know, enticing appeal to it.
Speaker 1: And yeah, you might be able to get a better
Speaker 1: picture on a larger machine, but you know you kind
Speaker 1: of balance it all out, like, well, what's more important
Speaker 1: to me? Is it more important to have the really
Speaker 1: sleek machine that still looks amazing or to have the
Speaker 1: absolute best, uh, visual performance. And I think a lot
Speaker 1: of people, you know, they you know, they tend to
Speaker 1: go to the flat panel for one, thing has been
Speaker 1: marketed as like the top of the line in uh
Speaker 1: in displays. So now it's part of that has to
Speaker 1: do with marketing, But I mean you can't underestimate the
Speaker 1: the appeal of that that thin wall mounted you know display.
Speaker 1: That's true, that's true. Well, Um, there have been a
Speaker 1: lot of different technologies that people have used to create
Speaker 1: the thinner or even flat panel displays. I mean they're um,
Speaker 1: you know, oh LED's the organic light emitting diodes. There
Speaker 1: are you know, the DLP l c os, you know,
Speaker 1: a bunch of stuff. But it really comes down to, well,
Speaker 1: at least for the most part, plasma versus c D Right. Yeah,
Speaker 1: I think oh LEDs will probably be something we'll see
Speaker 1: more of in the future, but right now, um, the
Speaker 1: technology is still pretty new. So the sets that are
Speaker 1: out there are very small, like around eleven inches pretty
Speaker 1: much it, and they're very very expensive. Um, but they're
Speaker 1: also wafer thin, and they're super do wafer thin, and
Speaker 1: there are beautiful latin I tell you, and um, you
Speaker 1: can even you can even make them so that they're flexible. Yeah,
Speaker 1: you could bend them around things if you I mean
Speaker 1: granted you have to build that into it. It's not
Speaker 1: like every set's gonna bend around everything. But um, it's
Speaker 1: really cool technology, but it's still brand new, comparatively speaking,
Speaker 1: and so it's uh for most of us, prohibitively expensive.
Speaker 1: So l C D S and plasma, let's get down
Speaker 1: to the brass tacks, as it were. So let's talk
Speaker 1: a little bit about the technologies behind these. Um, I'm
Speaker 1: just gonna do kind of a quick high level thing here, uh,
Speaker 1: hime in whenever you like. Alright, So, liquid crystal displays
Speaker 1: uses this stuff called liquid crystals. It's it acts kind
Speaker 1: of like a liquid, kind of like a solid um,
Speaker 1: and it's a it's essentially two glass plates with a
Speaker 1: layer of these liquid crystals in between. And by applying
Speaker 1: electricity to this layer, that's what you allow light through,
Speaker 1: uh to create the pictures. And so these televisions are
Speaker 1: back lit. There's a light source behind this layer of
Speaker 1: liquid crystals that provides all the light you see on
Speaker 1: the television. Plasma displays use an ionized gas. That's what
Speaker 1: plasma is. It's a gas that can conduct electricity and
Speaker 1: it lights up only when there are when there's something
Speaker 1: to show. On the screens. There's no backlight there. It's
Speaker 1: just uh, electricity activating this gas to create light, So
Speaker 1: you don't you don't have a constant backlight like like
Speaker 1: you do with l c ds, And that becomes important
Speaker 1: in a minute. Yeah. The neat thing about the plasma
Speaker 1: is that when you introduce some free um atomic particles
Speaker 1: into the plasma uh atoms, they basically excite the different
Speaker 1: atoms by replacing electrons and it makes them bounce around
Speaker 1: and when they do that, they give off light um.
Speaker 1: So it's, uh, it's sort of an atomic reaction. You're
Speaker 1: talking about actually subatomic really, because you're talking about electrons
Speaker 1: and photons here. This is quantum stuff. You're watching quantum TV.
Speaker 1: It's pretty awesome. I I really want to make a
Speaker 1: quantum leap joke, but okay, well I'm not gonna Yeah,
Speaker 1: I think that's a been dated anyway. So anyway, so
Speaker 1: we mentioned the back light for l c D s.
Speaker 1: Now that that's one of the big differences between the
Speaker 1: l c D displays and the plasma displays. This can
Speaker 1: affect something that is called contrast ratio. If you ever
Speaker 1: start shopping for TVs, especially flat panels and h d
Speaker 1: t V s, you'll you'll likely run into a lot
Speaker 1: of talk about contrast ratios, and well, what is a
Speaker 1: contrast ratio? It's the difference between the essentially the whitest
Speaker 1: whites and the blackest blacks that that display can show.
Speaker 1: So the bigger that number, like say say you say
Speaker 1: it's one thousand to one, the bigger that number is,
Speaker 1: the more colors that can show, the better the blacks
Speaker 1: are going to be, the better the contrast is. So
Speaker 1: a fifty thousand to one is a much better contrast ratio.
Speaker 1: And in general, plasma screens show blacks better than l
Speaker 1: c ds. And that's because, like we said, there's no
Speaker 1: backlight on a plasma. So if you want to watch
Speaker 1: a lot of movies, for example, a lot of really
Speaker 1: like kind of you know, dark, grim movie type things.
Speaker 1: They say, you want to watch The Dark Night, there
Speaker 1: are a lot of blacks in that movie. You know,
Speaker 1: you get like the black of the night, you get
Speaker 1: the black of the Batman costume, you get the black
Speaker 1: of the car, all of these things, um degrees of
Speaker 1: black exactly. Yeah, it goes from you're going to see
Speaker 1: the difference between them the pastel black from Yeah, for
Speaker 1: your spinal tap fans out there's a paste black. But
Speaker 1: they the if you have a screen that can show
Speaker 1: a very good contrast ratio, a very wide contrast ratio,
Speaker 1: you'll be able to see all that clearly. They're not
Speaker 1: going to blend into one another. It's not gonna look
Speaker 1: blocky or anything like that. Um So, plasma screens are
Speaker 1: really good at that. L c D s are are
Speaker 1: getting better, but traditionally they were seen as not being
Speaker 1: very good as far as the contrast ratio goes. But
Speaker 1: that's changing. Yeah, that's changing. There. There are a lot
Speaker 1: of improvements in that field right there, and and there
Speaker 1: are other change things that traditionally were different between plasma
Speaker 1: and l c D that are increasingly becoming non factors
Speaker 1: because the improvements in the technology have reached a point
Speaker 1: where it's it's getting hard and hard to tell the difference. Now,
Speaker 1: if you look at a lot of people's top you know,
Speaker 1: top television lists, I think you'll probably see more plasmas
Speaker 1: than l c D s even now, because that's the
Speaker 1: general consistent consensus is that they show more vibrant colors
Speaker 1: and the contrast is better. You can have larger sets,
Speaker 1: larger sets they don't. There's there's not really a problem
Speaker 1: with blurring with fast action. Some of the older l
Speaker 1: c d s had a problem with that where if
Speaker 1: something was moving across the screen very very quickly, you
Speaker 1: can get a blurring effect. So if you were watching
Speaker 1: something that had a lot of fast action in it,
Speaker 1: like you know, most sports, then you would get this
Speaker 1: kind of blurring effect, especially at high definitions. UM plasma
Speaker 1: didn't have that problem. But now again with l c
Speaker 1: d s, they know, you're just starting to see l
Speaker 1: c d s with like incredible refresh rates, which is
Speaker 1: how many times uh the television refreshes the picture that's
Speaker 1: on your screen. Um, you know they're a hundred twenty
Speaker 1: hurts is not unheard of, and that's that means it's
Speaker 1: refreshing at a rate about like a hundred twenty times
Speaker 1: a second. It's really really fast. And there are even
Speaker 1: faster ones coming out that I saw at c S,
Speaker 1: which were two hurts, so four times a second. Then yeah,
Speaker 1: so when well two hundred forty times a second, yeah,
Speaker 1: not four times a second, you're thinking you're you're dividing
Speaker 1: by minutes um two of a second. So that's so fast.
Speaker 1: I mean we can kind of detect around like like
Speaker 1: film I think is what like twenty four frames per
Speaker 1: second something like that, So this is ten times that. Um.
Speaker 1: The idea here being that that it makes smoother transitions.
Speaker 1: You don't see the blurring effect with with really fast motions.
Speaker 1: But still plasma kind of holds the advantage there, but
Speaker 1: it's not a not a really discernible one unless you're
Speaker 1: paying incredibly close attention. And then there's the power consumption issue. Yes,
Speaker 1: because l c D s are traditionally considered to be
Speaker 1: the more energy efficient technology. Yes, in general they are,
Speaker 1: but not as much anymore, not as much anymore, um.
Speaker 1: I mean even I remember a few years ago that, uh,
Speaker 1: some communities were starting to ban the sale of new
Speaker 1: plasma televisions because they used so much energy, right, And
Speaker 1: I can talk a little bit about why that is.
Speaker 1: The main reason is that, uh, you're having to essentially
Speaker 1: shoot electricity to excite these these atoms, you know, to
Speaker 1: in order to give off light. Well, even when you
Speaker 1: turn that television off, the electricity is still is still draining,
Speaker 1: you know. Vampire power is what a lot of people
Speaker 1: call it, um, because it has to stay ready, you know,
Speaker 1: for the next time you turn it on. People don't
Speaker 1: want to wait for it to warm up there and
Speaker 1: sucks down electricity and and so you get a lot
Speaker 1: more draining uh when the even when the device is
Speaker 1: turned off than you would with an l c D
Speaker 1: screen screen and l c D s also have to
Speaker 1: warm up. They just don't have as long a warm
Speaker 1: up time as plasma. And we're talking when we're talking
Speaker 1: about long warm up times, we're talking about a matter
Speaker 1: of seconds. But we've become so impatient as consumers that
Speaker 1: we expect when we put hit that power button, we
Speaker 1: expect that screen to come on pretty darn quick. So um,
Speaker 1: but your I can give you one example of a
Speaker 1: time when a plasma screen will pull less electricity than
Speaker 1: an l c D. If you're watching something that's perfectly black,
Speaker 1: because the l c D has a backlight and it
Speaker 1: will always be lit. Good point. If you watch nothing
Speaker 1: but the black, are sorry. If you watch nothing but
Speaker 1: the dark, Knight or spinal tap, yeah, something like that,
Speaker 1: then yeah, you're gonna you're gonna pull less power with
Speaker 1: your plasma display. But in general, yes, it's gonna it's
Speaker 1: gonna consume more power. Now, a lot of companies have
Speaker 1: developed UM power saving techniques to reduce that. In fact,
Speaker 1: it's become more and more important. I saw a lot
Speaker 1: of that C yes as well. They had a lot
Speaker 1: of different companies hooking up televisions too, UM electronic meters
Speaker 1: telling you how much energy it was pulling at any
Speaker 1: particular time, and they would line up previous models like
Speaker 1: here's the set we released in two thousand five and
Speaker 1: two thousand six, you know, all the way up to
Speaker 1: two thousand nine, and then maybe even like prototype models
Speaker 1: for for future ones. And you could see that the
Speaker 1: energy consumption peaked sometime around two thousand seven or so
Speaker 1: and then dramatically began to drop because that's when everyone
Speaker 1: started getting more environmentally conscious and also just an idea
Speaker 1: of serving power to save money. Right, So yeah, so
Speaker 1: that is also changing. UM. So it seems like the
Speaker 1: battle between plasma and l c D is almost becoming
Speaker 1: a moot point. It's sort of a pick the set
Speaker 1: that's best for you, because in general, they're all going
Speaker 1: to be about the same level of energy efficient, they're
Speaker 1: all going to show pretty much the same colors. Of course,
Speaker 1: it's always good to have a professional calibrate the TV
Speaker 1: because looking at it in the showroom. Well, it may
Speaker 1: or may not be the kind of thing it's it's
Speaker 1: not going to look the same in your house when
Speaker 1: you actually get at home. It's been calibrated specifically for
Speaker 1: that store exactly. Yeah, so it's important to calibrated either
Speaker 1: by a professional or if you know what you're doing,
Speaker 1: you can do it yourself. Yeah, there's some televisions that
Speaker 1: actually have calibrations software installed, so that uses UH uses
Speaker 1: light sensors to detect how much light is in your room,
Speaker 1: and then we'll calibrate the contrast and brightness and everything
Speaker 1: on its own, so that way you get the what
Speaker 1: presumably would be the best picture for your such a oation.
Speaker 1: I can talk about a couple of other minor things.
Speaker 1: UM plasma screens. They tend to have a glassy UH display,
Speaker 1: so there's very reflective. So in general it's better to
Speaker 1: use a plasma display in a room that has, you know,
Speaker 1: low lighting. So if you have a lot of bright lights.
Speaker 1: UH plasmas tend to be really reflective, you may not
Speaker 1: be able to see what's on the screen very well.
Speaker 1: UM l c D might be better in that case,
Speaker 1: because most of those have a non reflective or Matt
Speaker 1: style finish on their on the front display. So better
Speaker 1: for your man cave is plasma, right, which is exactly
Speaker 1: what I have. I mean, I turn all the lights off.
Speaker 1: I got the I mean I don't have a plasma
Speaker 1: display that I've got a man cave. Um. Yeah, I
Speaker 1: turn off all the lights when I when I watch.
Speaker 1: I've actually got a rear projection TV, so I've got
Speaker 1: one of those monsters. Um. But uh, the yeah that
Speaker 1: if you're if you're gonna watch in a dark room,
Speaker 1: plasma is a good choice. I mean you're going to
Speaker 1: get a great picture. Uh and uh and actually the
Speaker 1: funny thing is plasma is still a little less expensive
Speaker 1: than a comparable l c D. If you're looking at
Speaker 1: the the big, big screens, you know, the on the
Speaker 1: smaller end price is pretty much negligible. But if I'm
Speaker 1: talking about like, if you're looking at sixty three inches
Speaker 1: like a monster TV, plasma tends to be a little
Speaker 1: less expensive than l c D. Right, And also they
Speaker 1: do get bigger. You can get the really big monster
Speaker 1: TVs in in plasma. Actually, I don't even know if
Speaker 1: you can find an l c D in sixty three
Speaker 1: in you might have to drop down to fifty five.
Speaker 1: But well, uh, you know, if you're done talking about
Speaker 1: plasma and l c D. Wow, I do have a
Speaker 1: trump card, Yes, hit me with it. I want to
Speaker 1: uh remind you of your pet favorite TV. Are you
Speaker 1: talking about the Mitsubishi Laser View, Yes, I am, and
Speaker 1: you know that the manufacturer says that it takes one
Speaker 1: third the power of a plasma TV and has twice
Speaker 1: the color. So uh, but it does it with lasers,
Speaker 1: which means doesn't tell you that it just has twice
Speaker 1: the yellow, twice the yellow. That's just a joke. That's
Speaker 1: only only twice one color exactly. Yeah, yeah, we have
Speaker 1: half the blues, but three times the yeah, I'm just kidding. However,
Speaker 1: it's also eight times more expensive, you know, because it's
Speaker 1: brand new technology uses lasers instead of vel C D
Speaker 1: S or plasma or and it's it's gorgeous and it
Speaker 1: also is three D ready Yeah, but you've actually seen, yes,
Speaker 1: I have, and it's it's pretty capful. It's you know,
Speaker 1: when I first read about I thought I wanted one,
Speaker 1: and then I saw one and I knew I wanted one,
Speaker 1: So I still want one. I'm not gonna buy one
Speaker 1: any type soon don't don't have seven grand laying around
Speaker 1: to spend on it, but it does. It is very,
Speaker 1: very impressive television. It's not a flat panel um so
Speaker 1: it's not gonna you're not gonna mount that on your
Speaker 1: wall unless you have a you know, a real load
Speaker 1: bearing wall right there. But it's it's definitely an impressive television. Yeah, well,
Speaker 1: I guess that I don't have any more TV. The
Speaker 1: only thing I could talk about is burning, but that's
Speaker 1: not even an issue anymore. So, Yeah, there used to
Speaker 1: be a big issue used to if you had let's
Speaker 1: say that's your video gamer, and you would put a
Speaker 1: game on pause for eight hours where you go sleep
Speaker 1: and then you come back and play some more with
Speaker 1: with plasma, if those colors were we're sitting there on
Speaker 1: the screen for that long, you would see like when
Speaker 1: you'd start the game, you'd see that there was a
Speaker 1: ghost image of whatever it was that was paused for
Speaker 1: those eight hours, and sometimes the ghost imaged wouldn't go away,
Speaker 1: it was burnt into the screen for pretty much ever
Speaker 1: and ever, um LCD didn't really have that problem as
Speaker 1: much as almost almost uh didn't exist. But that's pretty
Speaker 1: much been solved too. That so you don't get too
Speaker 1: many issues with plasma burning unless unless you're just being
Speaker 1: really extreme, like you pause your video game and then
Speaker 1: you go on vacation for a couple of weeks, then
Speaker 1: you might have a problem. But you know that's that's again,
Speaker 1: that's an extra beream case, and that would be a
Speaker 1: certainly not a good way to conserve electricity. No, that
Speaker 1: would not be very eco conscious of you. I mean
Speaker 1: I would never do that, but Poulette wouldn't put it
Speaker 1: past him. So anyway, well, you know what, I've got
Speaker 1: something else we can talk about, but before we get
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Speaker 1: tech stuff. Okay, so let's get back to my favorite segment.
Speaker 1: I'm sure it's yours as well. Listener mail. Oh that's loud. Yeah, well,
Speaker 1: you know it's we have to alert them. It's really
Speaker 1: so it's early yet. This is true. So this listener
Speaker 1: mail comes from our listener, Jamie McCarty. Jamie actually has
Speaker 1: a correction for us, which we appreciate. Jamie was very
Speaker 1: polite and um and was also praising us quite a
Speaker 1: bit in this email. But I'm gonna skip right to
Speaker 1: the the correction. This is about our our podcast where
Speaker 1: we talked about games with GPS receivers. UM. GPS receivers
Speaker 1: do not transmit any information back to the satellites. The
Speaker 1: power required to transmit back to the satellites would be
Speaker 1: way too much for such small devices. Actually, the device
Speaker 1: is simply receiving and coded time stamps and up to
Speaker 1: date satellite constellation coordinates that provide enough information for the
Speaker 1: receiver to calculate its position. While it's possible to send
Speaker 1: out positional information, it requires a cellular radio waves or
Speaker 1: satellite modems and I guess now WiFi, which is which
Speaker 1: only the most sophisticated devices have. Thanks Jamie. That actually,
Speaker 1: that's that's true. Unless it has one of those devices,
Speaker 1: it's not going to send out any signals. It's just
Speaker 1: acting as a receiver, otherwise it would be a GPS
Speaker 1: transceiver yep, yep. So it's basically coordinating, uh, the signals
Speaker 1: it receives and figuring out where you are based on
Speaker 1: that information. So yeah, just getting bombarded by signals all
Speaker 1: the time as long as you're someplace where there's an
Speaker 1: open area to the sky. Yes, yes, So thanks very much, Jamie.
Speaker 1: We greatly appreciate that. And if you would like to
Speaker 1: write to us, you can do so at tech stuff
Speaker 1: at how stuff works dot com. And uh, if you
Speaker 1: want to learn more about l c d S and plasmas,
Speaker 1: we have any of information on the website. That's how
Speaker 1: stuff works dot com. And we will talk to you
Speaker 1: again really soon for moralness and thousands of other topics.
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