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How Do Touchscreens Work?

24309 ratings | 860796 views
Ever wonder how your finger can magically control your smartphone screen? We explain in this episode of SciShow. Hosted by: Michael Aranda ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters -- we couldn't make SciShow without them! Shout out to Justin Ove, Accalia Elementia, Kathy & Tim Philip, Kevin Bealer, Justin Lentz, Fatima Iqbal, Thomas J., Chris Peters, Tim Curwick, Lucy McGlasson, Andreas Heydeck, Will and Sonja Marple, Mark Terrio-Cameron, Charles George, Christopher Collins, and Patrick D. Ashmore. ---------- Like SciShow? Want to help support us, and also get things to put on your walls, cover your torso and hold your liquids? Check out our awesome products over at DFTBA Records: http://dftba.com/scishow ---------- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Instagram: http://instagram.com/thescishow ---------- Sources: https://gigaom.com/2013/07/10/the-metal-coating-that-makes-iphones-touch-sensitive-is-running-out/ http://www.ti.com/lit/an/slyt209a/slyt209a.pdf http://large.stanford.edu/courses/2012/ph250/lee2/docs/art6.pdf https://www.newhavendisplay.com/app_notes/TPcompare.pdf https://www.sparkfun.com/datasheets/LCD/HOW%20DOES%20IT%20WORK.pdf http://www.microchip.com/design-centers/touch-input-sensing/touch-screen-and-touch-pad-controllers/technology/analog-resistive http://arstechnica.com/gadgets/2013/04/from-touch-displays-to-the-surface-a-brief-history-of-touchscreen-technology/ http://www.gtouch.com.tw/products_panels_pcap.html http://large.stanford.edu/courses/2012/ph250/lee2/docs/art6.pdf
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Text Comments (1200)
So, as the saying goes (typically in reference to electrocution), "we're completing the circuit"?
Saswot Tripathy (8 days ago)
What if a insect sits on the screen?
Mohammad Adnan Khan (16 days ago)
But glove mode increase the sensitivity of a smartphone!! 😉
ram prakash (16 days ago)
What abt stylus ?
Abbi Zeiger (22 days ago)
One time I couldn't use my touch screen phone when my fingers were really cold. It would not go.
hexer (29 days ago)
Watched the whole video , still don't know how do touchscreen work !!
WOODEN WORLD (1 month ago)
Hi can you plzzz say me how you edit your vidios
Sly simon (1 month ago)
Im looking for a way to simulate touch screen that can control with a device like a raspberry anyone out there know
suresh carpenter (1 month ago)
why the hot water freezes faster than cold water
Random Chaos (1 month ago)
I have a Sony xperia z3+ it has Heat Detection. So if there is salt or water on the screen it doesent sense it butwhen your warm finger touches it it registers.
Pip Squek (1 month ago)
Im makin a pen for my phone now..
AppleDevice Help (1 month ago)
SciShow:how does touchscreen works Me:it works with hand
ReVo (1 month ago)
Bruh my phone works with any gloves...
J Dial (1 month ago)
Short, sweet, and informative....
Jdm Love (1 month ago)
Does it work on a dead body finger
SIngh (2 months ago)
A really big opportu ity you missed was tl tall about how galaxy s5 touch screen touch sensatovoty can be increased: allowing to use almost any glpves or pencils and pens to uae the tpich scree .
Logan Simon (2 months ago)
Charu Sahu (2 months ago)
And I thought they detected heart beat!
collin dee (2 months ago)
wait the what about screen protectors. if iPhones us capacitive screens why does my iphone work with a layer of plastic above.
Nurlan Ildirimli (2 months ago)
Good Information! Thanks!
Ky'Reese Davis (2 months ago)
I drooled on my phone and it pressed a button....
tuna G (2 months ago)
I actually feel good about myself.
GenericGeorge (2 months ago)
Why do rubber stylus' still work?
Macrobot Aurora (2 months ago)
Basically tons of microscopic colorful sensors that react to smooth surfaces and are organized in layers and lines.
Giovanni Paraizo (3 months ago)
If you use hidrophobic sprays on touchscreens,would the touch screen work underwater?Or it will be the same result?
kevin tejada (3 months ago)
Or waching youtube
captainrobots (3 months ago)
I got a pokemon go ad.
Jan Rosovic (3 months ago)
Pls change intro song
Random Weirdo (3 months ago)
I’m just sitting here tapping my phone screen
Cole Wof Wof (3 months ago)
Can't.. Stop.. Watching!
seanie huffels (3 months ago)
im using a tablet to type this comment so im basicly typing this on a touchscreen :)
memoca ! (3 months ago)
so is that why my switch wont recognise a plastic stylus but it does with my finger?
arjun krish (3 months ago)
Ishaan Bansal (3 months ago)
So are phones bionic tech
12345 678910 (3 months ago)
my dell touchcreen is cracked
Goldenfire Fox (3 months ago)
Oldpizza inyourcar (3 months ago)
thanks bro
Cartooon THAT (4 months ago)
this is good. thank you man
how is babby formed
Science Freak (5 months ago)
Superb video awesome one
trigga777777 (5 months ago)
With this same technology we can incorporate it to what can be the skin of a AI robot that way it can't feel like we do
Jovan Sanchez (5 months ago)
Why do stylist have to be dull to work.
Snoopy Jenn (5 months ago)
I have nerve issues in my extremities. After having a nerve conduction study done on my muscles i learned that my muscles dont produce much electricity. Is this why sometimes my numb fingertips don’t seem to make the connection i am trying to make on a touchscreen?
Tymongo (5 months ago)
explains why i can write this with a knife
Christine Realubit (5 months ago)
j2k how to make a phone
Bob Treduis (6 months ago)
My dogs use tablets lol. (Using a tablet for this comment :) )
playyboy nyc (6 months ago)
shouldn't you be at a corner deli buying beer and cigarettes
hellio ringos (6 months ago)
You're so direct to the point, just as how I would explain it, I subscribed and liked it 😊
saravanan sarou (6 months ago)
Does touchscreen current cause harm to humans..?
tenacious645 (7 months ago)
People love saying humans are stupid, but I'm often baffled by how clever human inventions have become. Figuring out electricity started a massive revolution, but from simple circuits of DC power, to AC power, to cathodes and diodes, onward to transistors and microchips it's incredible. And that's only the beginning 0.0....If you have taken the time to learn about how transistors work, I encourage it. It's impossibly clever and without them cell phones wouldn't exist.
Nut screw gamer (7 months ago)
I subscribed and turned on the notifications and don’t forget to see my channel
Nut screw gamer (7 months ago)
I subscribed and turned on the notifications and don’t forget to see my channel
Xistence Studios (7 months ago)
I don't get it ? Then why does my 100$ Chinese smartphone work with regular gloves???
Abhay Rajkarnikar (8 months ago)
why doesn't touch work if we hold a metal use the metal to touch the screen?
Logan Graham (8 months ago)
i was actually more interested in the circuitry , like for instance if i was going to wire one up to an arduino , how would i do this.
MavHunter20XX (8 months ago)
I don't know what to do with my hands
Oscar Cerro Quiles (8 months ago)
Who on Earth sweats like THAT!? (see 2:53)... *remembers Airplane!* nevermind... BTW, My fingertip hurts already for so many tapping and slidding on my smartphone, well, more like they got very sensitive despite I always tap softly. I know you said at 2:28 that the electricity doesn't flow through the finger, but my fingers tell a really different story after 2 years of constantly using my smarthphone...
Get LIT (9 months ago)
But I'm still waiting for touchscreen which is BONELESS!
tru jay (9 months ago)
you speak very fast for me still i try to learn something by pausing , rewinding and playing wait for the end ohh i get it, thanks..
Joey Henry (9 months ago)
Bread can activate touchscreens
Jonathan Devillier (9 months ago)
Haha he looks like Seth McFarland
jim nohj (9 months ago)
killed it
Twitch's Powerful Stand (10 months ago)
i wrote this with my touch screen
Luis Prado (10 months ago)
What are the health benefits of eating ass?
Luke Johnson (11 months ago)
I guess that's why my phone sometimes responds to a touch even though I just hover my finger over it.
Hurricane800 (11 months ago)
the future is here
utsav tailang (11 months ago)
you're making a part of electronics work
Rayyan Mamaril (11 months ago)
he's cute
Rishav Bhowmik (11 months ago)
All touch screens works through cloth .
Jack Warren (11 months ago)
tx for the info i always wanted to know how does touch screen work
Jaren Cascino (11 months ago)
So that's why only touch works on smart phones
Joseph Yang (11 months ago)
why does my touchscreen still work when I'm wearing these nitrile work gloves?
Latin Hope (11 months ago)
But I have a screen plastic protector how is this even conductive?
Dzrian (11 months ago)
why issit that i can even 'touch' even when i didnt even touch the screen only like 1 mm away from the screen
articular orb (11 months ago)
certain android devices have a glove mode function. allowing them to work on the touchscreen. how does this work? it'd be neat to know why everybody doesn't do it
charan vanapalli (11 months ago)
hello there is another type of touch screen , dont you know about surface acoustic wave touch
Joy Goldar (11 months ago)
Hi, could you explain how floating touch screens work, the touch screens seen on Sony smartphones where a user can use the screen from any glove or can even interact the screen without touching it but hovering the finger over it???
Yuri Sonuvavich (11 months ago)
I like to touch myself... Now how does THAT work?
RoBabi95 (11 months ago)
Interesting. Good video!
Terra Pantera (11 months ago)
Wait what about laptop touch pad?
Anubhav Jangid (11 months ago)
how touch screen works inside a water body ?
Swagat Rout (11 months ago)
How capacitive screens work after putting screen gaurd on then? Its glass and non conducting
Hrudhanshu Desai (11 months ago)
that was so cool
Dev Goyal (11 months ago)
choco bananas (11 months ago)
i dont understand why today's computers still got physical keys although everything now is touchscreen
Lars Maas (11 months ago)
But what about water resistant phones?
Lars Maas (11 months ago)
But what about water resistant phones?
Alexander Sam (11 months ago)
what happens when you have a screen guard over your touch screen
wonderful character (11 months ago)
wow...watching it on a touch screen...hahaha
Ali Maldonado (11 months ago)
that explains why my cellphone got crazy when I drop water from my fingers on the screen...
Kishore Mullagiri (11 months ago)
how can touch works after screen shatters ?
Richy Calculus (11 months ago)
diz guy luk like a ghetto scientist
SHOBHIT SINGH (11 months ago)
i guess he forgot about the glove mode :-P
Eduardo Villatore (11 months ago)
How does the screen protectors don't block the sensitivity on a capacitor type to touchscreen?
Pulkit Srivastava (11 months ago)
What about surface acoustic wave touch screen and infrared touch screens..
Zechary Chua (11 months ago)
how about the styluses at the ends of pens?
Mark Adaoag (11 months ago)
how about IPS screens?
Pookie Bear (11 months ago)
That's why it doesn't work with my nails
Honex (11 months ago)
pretty effective touch vid
Just an average guy (1 year ago)
Enlightening but then how does the increased sensitivity I.e. glove mode work in modern smartphones?

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