How Do Touchscreens Work?
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- Опубликовано: 25 май 2016
- Ever wonder how your finger can magically control your smartphone screen? We explain in this episode of SciShow.
Hosted by: Michael Aranda
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Sources:
gigaom.com/2013/07/10/the-met...
www.ti.com/lit/an/slyt209a/sly...
large.stanford.edu/courses/201...
www.newhavendisplay.com/app_n...
www.sparkfun.com/datasheets/L...
www.microchip.com/design-cente...
arstechnica.com/gadgets/2013/0...
www.gtouch.com.tw/products_pan...
large.stanford.edu/courses/201...
A very touching video
😂😂
Get out
I found it to be more hand-wavey
No, just no.
The first part had very pressing information
I was taking a picture of a rose yesterday with my phone, and had to wind my arm through the branches to reach it. I touched the shutter button once, and it proceeded to take a frantic series of pictures as if I were holding my finger on it. It had captured 13 identical shots by the time my surprise wore off and I realized what was going on. Because I had my phone behind a few branches, a leaf had the opportunity to lay on the shutter button.
The rose bush was taking selfies.
Not many people can say the plant took my selfies ☺️ 🌹
awesome show! thanks for providing all this awesome content for free on your channel for us! will always support in anyway I can, keep up the good work SciShow
Tears can also affect how touchscreens work. It makes it really hard to disconnect from a phone call after your girlfriend dumps you... #Kappa
@Matthew W Actually, the kappa part was a lie. Tears really do interfere with how touchscreens work so never cry during a phone call.
Cool!! I wish more people understood the intricacies of the technology they use on a daily basis. You explained it very well!
When I was a child, back when touch screens were just starting to be used I suppose, I remember going to this one pizzeria with my parents. They had a monitor/TV with a touchscreen there, and you could play gambling games on it. My father played a game on it, and he let me play too. It was a lot of fun, I remember being so impressed and thinking it was like magic haha! Nowadays every which way you turn there are touchscreens, it's kind of surreal to think about it. It's incredible how quickly the world can change, I'm only 23 years old and already in my lifetime I have witnessed the birth and spread of a new technology lol. I feel lucky to have been there to see it! Thank you for explaining touch screens! P. S. Could you maybe explain why my phone sometimes freaks out and acts like its possessed, even when I'm not touching anything? Like why does it suddenly start opening random apps and sliding stuff around lol.
You're so direct to the point, just as how I would explain it, I subscribed and liked it 😊
Very interesting and informative; thank you so very much! I was an aviation electronics tech in the Navy back in the 80s, and touchscreens had not been invented yet. Now I use a touchscreen many times a day, not only on my phone, but on the CNC equipment I am tasked with repairing (no aircraft unfortunately). Foolishly, I have not kept up with technological advances, so this is one of those things that has eluded me.
For some reason ,, why all of a sudden "how touch screens works" videos are popping up!! THIS IS THE 4TH VIDEO I SEE TODAY TALKING ABOUT TOUCH SCRREN
😟👎 It's disappointing how people are completely missing the most pressing concern here...... At 2:14, he mentioned that "the human body can store an electrical charge", but as of yet, NOBODY seems to be asking why they haven't yet developed a universal sized oral/anal/vaginal charging plug! Maybe that type of "interface" wouldn't be as efficient, and they are developing surgically installed USB charger interface. They would likely be installed into our waists(or the side of our heads)..... 😁👍
@@HighlanderNorth1 no thanks
@@HighlanderNorth1 By the power invested in me, I now pronounce you man and WAT?
Why are some rain drops bigger than others? And what determines how hard/much it will rain in a particular area, even within the same cloud?
Rain forms when cold and warm air collide. Because less water vapor(invisible) can be mixed into cold air compared to warm air, water starts to atomize around particles in the cooling warm air. Warm air also has a lower density than cold air, making it float upwards. As a result, the excess water which has begun atomizing (white) is blown upwards. While the clouds rise, more and more water merges into bigger drops. The drops will fall the moment their mass is too big for the wind to carry it upwards (Gravity works on mass in a volume, friction works on a mass in a surface, and volume grows faster than surface area when adding mass to a drop How big they get depends on how strong the wind going upwards is. In a warm front, warm air gentle slides over cold air meaning there's little wind pushing upwards. In a cold front, warm air is almost going straight up which forms cumulonimbus (very high and dense clouds, short but strong rainfall) as opposed to nimbostratus (low, flat mist like clouds, long but weak rainfall) in warm fronts.
The amount of rainfall in an area depends on several factors. One is how much water vapor is getting into the air. This depends on how much water there is on the surface (coast ... desert) and how much evaporates (climat). Another factor is sea currents. The Andes, the mountains on the west coast of South America, are very misty/cloudy and wet because there is a cold sea current coming from the west. Air currents also play a major role. There are several (almost) horizontal bands going around the earth that have a concentration of either warm or cold air. Above the Sahara desert is a cold band. Cold air sinks down, and air needs to rise enable for rain to form. Thus, the Sahara region has little rain fall. There's also a cold band (more of a circle) on the poles (cold desert), and a warm band above the equator and Europe creating extra rainfall; and so on. These bands move according to the tilt of the earth (which parts of the world are heated the most), which is why India has a very dry winter and a very wet summer. The last factor I can think of, is the direction the wind is coming from. Depending on the time of the year, wind often has a direction it primarily comes from. In India this is north during the winter and south during the summer. South means moist sea air is being carried to the land, north means dry land air is being carried to the land. This autumn in Europe, the wind was coming primarily from the warm and dry south. This is not the case normally. Here in Belgium, we had a very hot and dry fall as a result.
I hope that answers the question thoroughly.
Oh, I forgot to mention terrain. Mountains or high buildings force the air to go up. Higher up, the density of air is lower, which means air expands while it rises. While the volume increases, the temperature and pressure lowers. Rising and cooling air results into clouds and later on bigger rain drops. This is why mountainous areas are very wet. The land behind mountains is dry, because now the opposite happens: the air sinks and warms up. What "behind the mountain" means depends on the primary direction of the wind.
👉You see, inside of every dark-ish tinted cloud, there is an unseen, solid, saucer-shaped basin where water is stored. Since these "cloud-saucers" are shallow, they are always at risk of becoming "over-filled"! When they do become over-filled, the excess water simply overflows, which becomes what we refer to as "rain". During extremely windy, stormy days, the wind actually causes 'wave-action' to occur in these cloud basins, causing significant overflow of water(ie. "heavy rain"). 😉👍
I'm an 19 year old electrical engineering major, as well as an enthusiast of the natural sciences, so this was very informative and entertaining. Additionally, I do love of the compressive scientific information about electric fields and the polymer, polyethylene, used. This is also coupled an engineering understanding on how electromagnetic theory, polymer, as well the information about the body's own electromagnetic input can be synthesized to create a practical technology.
Not to mention, I posed this very question, internally, yesterday so this video satisfied that questioning. Good job Scishow, keep it up with similarly compressive videos and relatively short videos. 👍
wonderful show.Thanks for providing this video.Really useful and practical.
The university of Notthingham has developed a highly accurate resistive touch screen method using quantum tunnelling through graphene giving point accuracy, multitouch capacity and tiny pressure variation needed to make it work since only a tiny movement is needed. This could be adapted to using an exterior glass composite screen rather than a flexible plastic layer.
Splendid and tremendous
Impressive.
I'd always been curious about this. Thanks!
I used to hate this guy and his voice but I kept watching cause I loved the info and learning. Now I love his voice and how he hosts along with the info provided!! Time really does a lot.
Why is it that I can still use my touch screen with a screen protector on?
!
Illumanati
Because it's conductive
Pepe! At The Disco yes, but wouldn't that activate the entire screen at once? screen protectors are almost never aligned perfectly.
Screen protectors are not conductive. The reason that touchscreens work with screen protectors is that capacitive touchscreens don't register a touch when an object directly touches them, but when an object gets very near to them. Capacitive screens detect changes in an electromagnetic field caused by something conductive coming in close proximity to the screen. Since screen protectors are very thin, your finger gets close enough to the screen to register a touch. Soruces: www.quora.com/How-do-touchscreens-still-work-with-a-screen-protector www.reddit.com/r/explainlikeimfive/comments/2k6lz5/eli5_how_does_a_phone_touchscreen_work_through_a/ www.wikiwand.com/en/Touchscreen#/Capacitive
how about those old touch screen analog TV's back in the 90's? i still remember those being in those old arcades.. how does those things work? are the glass screens has magnetic sensors aswell or a different thing?
Its called Black Magic.
+christopher weaver no, it's called Black Jack and hookers.
+christopher weaver Witchcraft.
wow. This was actually very informative. Thanx guys
tx so much very comprehensive explanation
my phone has glove mode bruh
shhh, don't tell the apple fanboys. they will lose their false sense of superiority and the opportunity to be obnoxious when it comes out on the iphone 9.
It just increases the sensitivity of the same capacitive touch screen. So it will sense your finger from further away. (How much your finger affects the capacitive loading effect of the screen is inversely(ish) proportional to how far away your finger is.)
Mine too and I payed 30$ on it, lumia 520, an amazing phone with an amazing camera. One of the best values I got ever from a product.Too bad microsoft are being retards and started discontinuing important apps from lumia 520, they just want us to buy their newer phones even though the apps used to work on lumia 520 anyway, fuck microsft
My issue with the 520 is that they clearly don't give any fucks about their Windows phones at all; even the newer ones running Windows 10. ALL Windows phones have one major issue that they all share. The OS likes to randomly restart the phone for no reason. It's been an issue since the phones started running Windows 8 mobile, and it's carried on to Windows 10. No Microsoft representative on the forums can give me a straight answer as to why it hasn't been fixed when it's clearly been an issue since Windows 8 mobile, which either means that it's a fatal flaw that can't be fixed at all because of how the architecture of the phone itself is designed, they can't fix it because the OS becomes unstable every time they try to, or they simply don't give a single, solitary fuck about their Window's phones to begin with. I honestly have a sneaking suspicion that it's a sort of combination of the three. The first two options are probably a byproduct of the latter, as those wouldn't be happening if they hadn't been fucking around with their mobile platform since Window's 8 mobile came out.
It never did that to me. It works fine. But I agree that they don't give much of a fuck about windows phone, they're discontinued so many important apps. Refocus was a killer app, and they discontinued it from 520, why the fuck a sane company would do that, these guys are insane, they shot themselves in the foot. It's sad because the phone itself is freaking awesome, high sensitivity touchscreen, works with gloves, speakers are good, camera is great... very cheap. But the OS and apps instead of getting better and diverse, OS becomes shittier and apps become fewer, fuck microsoft.
Why does helium make your voice go high pitched.
Physics, helium is much lighter than air so when you speak it moves much faster and thus produces a higher pitch through vibrations.
It doesn't, you just change your voice manually after inhaling it to trick people into thinking the helium does it.
+Super Hans I find that more plausible than physics
+RedTriangle53 you've obviously never inhaled helium..
this can be easily znswered in Google. Don't make scishow waste their time.
that's so interesting! I really had no idea how the different types of touch screens worked before this video.
I KNEW it!! I figured that that's how touchscreens worked, because my earbud wires can use the touchscreen every inch as well as my fingers can. Nice vid!
*Looks at phone suspiciously*
Now I know your secret...
Would've liked a more visual explanation at 2:24.
Zpinn t
This is really useful. Thanks!
Super, very informative!
What about the "glove mode" on some smart phones? Does that just ramp up the electric field so that it'll respond to your finger from a short distance?
I think so because I've noticed that when I have the mode on, I can actually open an app by putting my finger really close to the screen but not quite touching it
I had a really strong glove mode on an xperia sola I owned. It could detect touches from as far out as a centimetre. It was pretty cool to be able to control things without ever touching the screen.
Who got to this video with a touch screen
I didnt because i am using a iphone4
+Alex Cornejo what
Wut?
does grammar exist in your world?
me
learn how to spoken
thanks so much! i needed this for my ks3 physics!
just beautiful wondered this for ages :)
So that explains why my 3DS won't register two touches at once! That always aggravated me.
Rude piece of shit
what did he orginally say?
All this aggravation ain't satisfactioning me
+john ben "Fuck all bitches, they're Men's property"
Chris Ice thanks
That's pretty cool.
You're pretty cool!
0 Kelvin is pretty cool
My friend and I were arguing over how touch screens work at school today.
Good thing you made this video to clear things up! :D
Now that was fast. Just what I needed.
Didnt gameranx do a similar video yesterday?
Yep.
:3
They are probably friends
Yeah but these videos take a while to edit, so it is probably a coincidence (and this video was already out a few days ago on patreon).
Gameranx is such a click bait, title whoring channel.
Use a normal title instead of NEW XBOX ONE IMPLEMENTED INTO BED or something like that.
lol good timing, gameranx did this exact video yesterday
ikr
I find that funny...
Yeah, a funny coincidence (and btw this video was already out a few days ago on patreon).
Magwitch forgot about that
Good Information! Thanks!
Awww thank you!!! Such an amazing and useful vid!!
That's a lot of sweat 2:52
Can easily happen when you have your phone in your pocket during sports or use it afterwards.
hey i got a good question, what is the deal with all the dead skin on feet?
You mean callouses? That's normal lol, in case you were worried. To my knowledge, they result from dead skin cells piling up in reaction to constant wear and tear on that part of the body. You can technically get callouses anywhere, but the bottoms of the feet and your outer elbows tend to get callouses more often because they see more use. You could say they're kind like the human body's natural armor, haha, protecting the skin and making it so you don't feel pain every time you walk on gravel or rough ground. Still, if it bothers you, there are always ways to remove callouses. One way is with a pumice stone, which you basically rub against the callous to scrape off the built up dead skin. It's... not as painful as it sounds, lol. The skin is already dead so you don't really feel it. I recommend showering right before too, to help soften the callous and make it easier to scrape off. Sorry if that whole paragraph grossed you out lol.
This is so awesome !!
perfectly explained.
not too short, not too long, perfect.
Strange how Gameranx just made a video about this...
Literally just thought that when i saw this in my sub box ugh
well they kinda add to each other soo....KNNNNAAWWWWWLLLLAAADDDDDGGGEEE!
Sci show literally has these planned, written, and filmed generally several weeks in advance.
Life is also made up of copy cats.
Ya
I'm using a touchscreen right now to type this comment!
Also, FIRST! ^_^
Awesome!
+SciShow I know, right?
(I wonder who's in charge of the SciShow comments/YT account...)
How did you post that comment 1day ago if the video has been up for 5 mins
Alfie LFC Patreon man, Patreon.
It has actually been two days.
I think by supporting the show you get to have early access to videos
i've always wondered how touchscreens worked, thanks for this video
I was literally wondering about this a couple of hours ago, then this video popped up in my feed just now.
Does this also explain why a mango and banana works with my phone's touchscreen?
just came back from prom. back to science I guess
lol how was it
I read that too quickly & thought it said 'back from prison.' Lol
"Just came back from pr0n. Back to science I guess." - there, FTFY #Kappa
Yoopsen213 it was actually way better than expected! The dj was really good
LordDragox412 hahahaaha ; )
A type of touch screen I have used is an old IBM one for their cash registers. It works by having a vertical and horizontal laser grid with sensors, and when you disrupt the grid, it knows an x and a y to click. Its neat, if a bit bulky and prone to error.
Thats fascinating. I'v always wondered how they worked, and now I know.
212 views, I'm so early!
I should probably make a joke...
What do you call a lady with one leg?
Eileen!
Now, I and a lot of other people have 'glove mode' on their phones. How does that work then? Same issue with water resistant phones like the new Galaxy S7 that can be used while you shower.
Yeah, my Sony Xperia Z2 has a glove mode. I'm assuming it just increases the sensitivity of the sensing lines on the projected capacitance display.
Water shouldn't affect the screen. Sweat does because it's saline.
Water has salts in it, too. It wouldn't conduct electricity otherwise.
+woodfur00 but water does affect the screen. at least mine
+woodfur00 only ultra pure water isny a conductor. Common water is
Thank you for this episode, earlier today I had realised how I didn't know how a touch screen worked
interesting, informative and awesome video
Am I the only one who is more fascinated with technology than space stuff?
Looks like.
They Co-Exist as advances in technology enhance space exploration and space exploration inherently creates new technology.
You are an idiot.technology and space science are connected each other.
Plug me in, I'm ready :D
Ready for what?
To be one with the machines, he was talking about being part of the electronics :P
Maybe you always are a part of the machine... Tell me... Red pill or blue pill?
"Plug me in, im ready :D" then, "ready for what?"
(Lenny)
Finally, a real explanation! When I typed that question in on RUclips, they didn't explain the touchscreens , only the motion sensor
very good vids keep up the good work
Why does heat make your hair straight?
It denatures the keratin
+Michael Hemingway isn't hair made of dead cells?
+sharon xox No, that's your scalp (dandruff). Hair and nails among other things are made of keratin.
no, its made of the same stuff fur feathers and scales are. dead cells are just dead cells, they would slough off, and wouldn't have such characteristics as shine, elasticity, and tensile strength
Because gay hair is too cool to be there
Where is Hank?
+Goku Just like you when you were trying to fight the androids
Every Sci-Video upload, it be hank or not.
+Goku He's better now. Hank is on tour with his band, and he's been appearing in videos on the Wheezy Waiter channel.
Geph C Awesome thank you.
Selling propane and propane accessories
Keep up the good work. Good luck 🍀
My lumia 520 has a setting called "high sensitivity" which is turned on by default, what this feature does is it allows you to use the touchscreen with gloves on, no matter the material, rubber, cloth, anything. Furthermore it works with your fingernail, it works with any kind of metal, even covered by isolator such as rubber or plastic.
So which kind does my nintendo DS use?
I wondered the same
Resistive
Penis
You couldn't figure that out by watching the video? -.-
The DS and 3DS touchscreens work with anything that applies pressure, so it must be the resistive variant. Otherwise they stylus wouldn't work!
How do those pen things work that you can use instead of your finger?
They will have conductive tips
they are conductive
A stylus for a normal phone conducts body capacitance to the screen, so it's similar to using your finger. The stylus on a phone like the Samsung Note series is different -- these have a digitizer embedded in the screen, and use an inductive stylus like a Wacom tablet for much higher precision.
Cheap ones are simply conductive and conduct your fingers capacitance to the capacitive sensor and slightly more expensive ones contain a capacitor so they don't need your finger to work.(you can even make a decent capacitive stylus by taping some conductive foam to the negative end of a AAA battery)
the much more expensive drawing stylus units such as those drawing tablet from Wacom use inductive sensing. A small coil in the pen presents an inductive load to a grid of wires with alternating current running through them. The AC current generates an oscillating magnetic field which is picked up by the coil in the pen altering the current running through the wires.
+gman060692 fuckin nerd
this is good. thank you man
man, the amount of ingenuity of the first person who had to make one of those things without directions to follow
I hate touch screens. I want god damn fucking buttons. Please make a decent phone with buttons.. I don't need a 6-7 inch screen
so, basically you want a phone that gives you a challenge instead of an easy-to-use touchscreen?
I'd live with having my phone be twice as thick if it meant it had a sliding screen that revealed a full qwerty keyboard. I'm sure they still make models like that but they're uncommon and you never see them. I've had two smartphones and both have had shitty touch screens that lag or aren't always accurate, plus they don't work when you have crap on your hands and you can't use them without looking very well. Must be less expensive to manufacture a touch screen
Blackberry Priv. It's awesome and it uses android.
Just buy an old-fashioned flip phone. Or blackberry.
....Where do you live where you can't find a flip phone anymore?
So who grabbed their phone out and just started swiping while watching this?
me
tx for the info i always wanted to know how does touch screen work
Cool video, got my sub!
I don't know why, but I can't stand this host. I always tune out when he's hosting. I don't know why...
Yeah, I like Hank better
Really, I thought he's alright
I prefer Aranda, his voice is so soothing
I think he's great... to each their own I guess.
Maybe it's his hair...
Hello I'm Donald trump
drop out.
"Let my people go"
-Moses
lol
Donald Trump, the original Annoying Orange!
Booo
the animations are so smooth
I haven't help/ supported the channel. But I am big fan. i have been following this channel for almost two years if not more than two years. One question I have, if you could answer it. Why is the moon hollow?
:D You guys should do a bit on stylus tablets, those Wacom types with digitizes artists use, it's similar tech. There's actually a few different kinds of them, and they're finding their way into laptops and phones lately. Neat stuff!
Interesting. Good video!
Superb video awesome one
Woow! Learned new stuff!
Answered one question ivr had for a long time, cool!
That was very interesting, I've always wondered how touch screens worked
I seem to recall that one of the first (if not the first) attempt at touch screens involved putting the monitor on a platform that was sensitive to how it was being tilted ... from that, it could determine what part of the screen you were touching.
this video has changed my life
Really cool video.
great video 👍👍
Hey Scishow. Can you guys do a video on how brass instruments (or instruments in general) produce sound. Too many people think that you just blow into it in the case of brass instruments. Thank you.
This video blew my mind
nice yaar i really appreciate u and enjoyed
Nice video...I'll keep in TOUCH 👍
Awesome, good to know.
I ASKED THIS QUESTION AGES AGO OMG
Nice fast talk :)
This guy is in my opinion the best commentator in this channel.
@SciShow I like your H&M jacket! I have the same one
gameranx (or however that youtubers name is written. I recently subscribed to him) made a video about touchscreens too. I think this video is way better though.
thanks for this video ... my questions that if touch using by any conduct material..its should be work right... but i tried operate to the screen by conducting material like bold screw
its dosn,t works..
0:43 you pictured PET preforms when you mentioned polyethylene , PET (Polyethylene terephthalate) and PE ( Polyethylene) are significantly different. I'm far from an expert on polymer selection but I think PET would be the plastic of choice and therefore the one they are using in this case.
Do a video on what is internet because I NEED it
Hey scishow, would you please explain how airplanes fly, especially about how the wings create lift?