LCD Monitor Teardown

Bill takes apart an LCD monitor and shows how it works. He explains how it uses liquid crystals, thin film transistors and polarizers to display information. EngineerGuy's new book is at www.engineerguy....

[@smartereveryday]

Great video. I love the irony of ending it with a CRT powerdown blip!

[@moki2093]

YOO

[@MMMMMMMMMMBALLS]

Yoo

[@DrKlown]

I thrive for educational videos

[@Poolie]

@Jamie Shepherd btw yall this is a bot account dont go there is gonna do some bad shit to you

[@Poolie]

@Karsyn Bodhi btw yall this is a bot account dont go there is gonna do some bad shit to you

[@dennisneo8253]

Holy God. There are some smart people out there.

[@Buggerme75]

I've watch it several times and still don't understand lol

[@shridharambady2069]

+Immortal Okay so you know how light is a wave? Well that wave can go up and down(vertical), side to side(horizontal), or in between. Polarizing means to only allow light going in a specific direction. So if it's polarized for vertical light, all vertical waves go through, all horizontal light gets blocked, and in between waves kind of get through but are forced to become vertical. In an LCD screen, there's two polarizers, one for vertical, and another for horizontal. Light goes through the vertical polarizer --> all light is now vertical. But wait, when it hits the horizontal polarizer, none of the light will go through, right? Horizontal only lets through horizontal light, and we've just made all the light vertical. So between the two polarizers they place a sheet of liquid crystal. The liquid crystal can twist the light based on how it's warped, and you can warp the liquid crystal with electricity! (How that works is very complicated, that's where the real science and tech is). If you want light to go through, you apply an electric field to the liquid crystal, the liquid crystal warps, and the liquid crystal twists the light, making the vertical waves horizontal, thereby allowing it to pass through the horizontal polarizer. Then it hits the pixels and that's what you see on your screen.

[@gblargg]

+Immortal The essential element is light polarization, which isn't normally perceptible to our eyes. Light can contain a mixture of random polarization, or just one particular angle. It's like a straight-slot screw, and can be turned to any angle. There are filters that only let light with a certain polarization through, and block that which is at any different angle. Finally, via electrical control, the liquid crystal material can be made to either leave the polarization alone, or rotate it. Put these together and you get a light shutter that is electrically controlled: put a filter to allow only one polarization through, then the liquid crystal, and another filter that's rotated 90 degrees. When the liquid crystal is leaving polarization alone, you get dark because the front filter blocks the light with the wrong polarization. When it rotates polarization by 90 degrees, you get light because it goes through both filters.

[@haz939]

+Dennis Neo LCD technology never fails to amaze me.

[@baconology]

it is all on wikipedia.

[@xarinatan]

I've wondered about how this worked exactly for years, and then you just explain it like it's the most simple thing in the world. Thanks, this really helped out!

[@2007excalibur2007]

I just tore down my first LCD... this made much more sense now than when I first watched it.

[@TriFrce]

this was fantastic. i've wondered about that polarized screen for a while.

[@achannelfornoreason6550]

Enjoying your videos in 2019 !😌

[@KrunchyTheClown78]

TN panels are still perfectly good displays, I think LED backlights have put alot more life into them.

[@jameslaidler4259]

Interesting indeed. Still rocking my old IMB ThinkVision CRT monitor with 1200 by 1600 resolution. The TV is a Toshiba LED one though, lol.

[@quantumleap359]

+James Laidler Yep, up until just a little while ago, I was still using my Macintosh Trinitron-based CRT. The tri-color CRT is also an amazing device.

[@InFltSvc]

God ! I wish this guy would have been my teacher in school

[@brian_el]

Awesome. Now tell us what component determine the refresh rate.

[@mynameisscanty]

lol @ 1:43 who thought it was a pesky advertisment and tried to exit out of it?

[@orlevitas2944]

GREAT VIDEO!

[@WhiffenC]

@quangluu96 I picked up a Plasma a month ago. A Samsung PN51D6500. I really like it, has quite a gorgeous picture and deep blacks. Its just over an inch thick and was light enough for me to pick it up and carry around myself. Take a look at some of the offers out there, Plasmas don't deserve a lot of that criticism anymore. If you leave it in energy saving mode for the first while the chances of burn in after is very low. Or put the timer on before you sleep :D

[@mattdathew2794]

very informative

[@muhammadabdelrahman6090]

you speak too fast in the video hahaha but it's awesome and extremely useful thank you

[@nithinmohan3140]

Can you please make a video on why the invention of blue LED (only recently) won a Nobel?

[@benapat723]

mind blown, im just too stupid for this. but great great video non the less

[@kalpesh4100]

I opened my Laptop screen completely and i found 3 peaces of paper sheet underneath my laptop screen. Now I know why they put that . Hmm.. Thanks for the video

[@oueirehoahttb]

Can we convert transmissive to transflective screen?

[@360kal]

i still don't get why you need the polarisers ???

[@PhantomSkye9]

OH! THAT'S WHY WHEN PEOPLE RECORD THEIR TV YOU CAN SEE A HORIZONTAL STREAK DESCENDING ON IT!

[@Fugitive292]

This guy would make the most awesome grandpa.

[@engineerguyvideo]

We prefer to use "avuncular."

[@bozscaggzz7475]

Or lover.

[@GNeuman]

Who are the geniuses who invent this? I feel very humbled...

[@Omanjack]

Wow someone on the internet actually using the word humble correctly!

[@VikasVJois]

Truly. We often don't realize the amount of engineering effort which goes into enabling everyday objects

[@SEMIA123]

More people than can be listed, depending on how you want to consider it. Think of how many prior discoveries the LCD panel relies upon, and how many prior discoveries those prior discoveries relied upon, and so on until the first invention.

[@SandersonReed]

The University of Hull, UK claim to have invented the LCD. They never bothered to patent it though because they thought it wouldn't be profitable... yeah, 'geniuses'...

[@flaplaya]

Not who but what GNeuman. 125 years ago we were riding around on horses like the previous 50 millenia. All the sudden boom.

[@xygomorphic44]

This video made me understand and appreciate this technology in a way I never have before! Just kidding, what it really did was make me feel like an idiot.

[@cafearga]

He said sandwich.

[@garydunken7934]

That liquid in the sandwich is mayonnaise. Just kidding. Nice video and well explained.

[@frankbritt2172]

xygomorphic44 LOL. Same here

[@thederpydude2088]

I didn't understand it all either, but the stuff I did understand was still pretty cool

[@erikpoephoofd]

The cool thing is that even newer displays are simpler. OLED's don't need backlight because it's the pixels themselves that emit a light, instead of just filtering the existing backlight. This means you don't need all the diffusing and polarising films, just the sheet of pixels. It also means you can turn pixels off to create perfect black and that it can be made to be even thinner, almost as thin as a piece of paper.

[@ferhatates4475]

Actually it is not quite fair to say that OLEDs are simpler in functionality comparing to LCDs. Having fewer steps in sending the information to the end user does not necessarily mean that it is less complex. The sole technology behind the research and development of organic LEDs (OLEDs) is way more complex than filtering the white light as is in LCDs. I would compare OLEDs with CRTs in complexity, yet not with LCDs. Tough there are astonishing technologies used in LCDs both optical and physical.

[@Jorvas25]

Very nice OLED tech in a nutshell. I did not know. Thanks man.

[@Misterixraccon]

I know this is old but this is what i was thinking about through the whole video. Why dont you just use pixels to create an image if yo are already giving the power to light up?

[@Muppets_Waldorf]

and lose up to 50% in brightness. newer/different (tech) does not automatically mean "better".

[@berengerchristy6256]

@@Muppets_Waldorf and also burn in

[@rockos414]

Huh? I'm just going to stick with magic as an explanation.

[@mercronniel3122]

You could even found a religion!

[@ginaxs7975]

😂😂😂😂

[@Iivaitte]

***** Thank you, you helped me understand something I didn't quite understand for years.

[@quantumleap359]

I have a Radio-Electronics magazine from April 1968, and there is a little article about RCA's liquid crystal display. It was monochromatic, and very small, perhaps 2 inches by 2 inches. Who knew the wide ranging result of that technology?

[@lawliet2263]

Wow

[@frederickjohnson2116]

Engineerguy, can you show me how an OLED screen works?

[@snyte9685]

+Figgle Shoemizer eliminate the backlight part, every pixel is lighted individually and there you go

[@Cobalt985]

Every single pixel in the OLED screen is lighted individually. Every pixel is its own backlight.

[@ferhatates4475]

In true OLEDs, every pixel is made of an organic light emitting diode which is controlled by a transistor (usually TFT as also used in LCD control) meaning if the transistor is on, then the OLED material emits light. Normally each OLED pixel can emit visible light of different colors(according to its production process it has a certain color gamut), emitting different colors at different voltages applied by TFT. By this way, pictures are produced. So, there is no backlight used in OLED displays, each OLED pixel emits its own light. It is similar to inorganic LEDs, when you apply a potential across the OLED, it shines light. But, as I am informed, most of the OLED panels produced in todays world are configured differently. In such configurations, OLED pixels do not emit different colors but produce just bright white light, and they use RGB filters on these OLED pixels in which these filters filter out red,green and blue lights creating sub pixels each paired with an OLED pixel. Thus, most OLED displays used today are not true OLED displays. Tough they are still more efficient, and have better contrast comparing to LCDs.

[@robertkielty5094]

Ferhat ATEŞ, This is a fine reply. So good in fact, when I read it, in my "mind's ear" I heard the mellifluous tone of Bill Hammack's voice. Bravo!

[@RazCloset]

Wow. All the hard work and brilliance that went into the creation of this technological wonder. All so that the world can watch Real House wives and the Kardashians. Do I laugh or cry?

[@codzomz]

Definitely cry...

[@dsandoval9396]

+James Laidler There's a HUGE difference between Internet pornography and the Kardashians... the Kardashians DON'T serve a purpose.

[@jameslaidler4259]

True that.

[@sycobeansillywytgirl]

You get over yourself and let people enjoy what ever want.

[@jameslaidler4259]

Someone's defensive, lol.

[@PatrickUnrated1]

This video just amazes. I can't count how many times I have watched this video over the past three years. I have used this as a source of many projects throughout my college career. I have had to write technical papers, do expertise/explanation speeches for classes, and I always refer back to this video. It's so interesting, enjoyable, and easy to follow. Thank you, and I really hope more of these can be done someday.

[@scaleop4]

that has got to be one of the best ones yet

[@derkgfan192]

It's so awesome !

[@darkmater4tm]

Some did imagine mobiles without light-weight screen. They called it the Pipboy. I hate Pipboys so much...

[@SiddhantPatil]

Very, very well explained! thanks a lot!

[@traktortarik8224]

Ok yeah, it's a white screen n stuff... OMFG THERES A PICTURE THING ON IT

[@fisharmor]

Please do a video on older DMD projection TV's! What they did with a mechanical array is even more impressive from an engineering standpoint, IMO.

[@leelyana]

People are genius! i'm not though, i'm not even close i feel fucking stupid :(

[@curious5661]

+leelyana Ofcourse you arent stupid, dont be silly. The fact that you watched this video shows you are interested in finding out how stuff works, that on itself is a smart move. :)

[@leelyana]

L Lawliet I love you :')

[@curious5661]

leelyana *blushes*

[@Just-SomeGuy]

The thing is, these days we are standing on the shoulders of generations of testing and innovation. No one person knows all the answers, but together over the centuries we have learnt what we have learnt. All the people involved in this innovation will have had to pool their technical knowledge to get the final result.

[@curious5661]

Ross A but no result is final. Everything is in constant transition.

[@MuddyBob650]

The whole time I felt like my monitor was going to kill me.

[@craigdotzert8120]

I can't believe this guy invented all this stuff! cool!

[@fmaz1952]

Craig Dotzert lol

[@SKRUBL0RD]

Now do Cathode Ray Tube :)

[@insatiable2rossi]

Instantly subscribed !

[@vivalavega01]

so if w put a highspeed camera on front of an lcd screen, will we be able to see the rows be turning on one at a time?

[@Wiizl]

Slow-mo guys should do this

[@bandpractice]

Wiizl Oscar v TV screen refresh in Slow motion @ 10,000 FPS in UltraSlo

[@vivalavega01]

haha nice find!

[@georgerosebush9754]

bandpractice I think that's actually a CRT, not an LCD.

[@CheapSushi]

Oscar v Would be cool to see. I think there might be an issue with the frame rate pf the camera versus the refresh rate of the LCD in order to show it happen. Not sure.

[@hussoe4321]

thank you very much, enlightening. i'm wondering if any video about how a PROJECTOR works?

[@vivalavega01]

yes, samez

[@lllBOLTlll]

how long has this guy been around... a,a,a,a AMAZING

[@KyleChaplin]

Did you say gold background? I see a green background in this video.

[@mcpepa]

you earn a suscriber, thanks for share your knowledge, it took me forever to find a good explanation to this tech.

"Imagine laptops/cellphones without lightweight screen." -Bill Hammock on LCD screens "Why am I wearing Microsoft's version of the Apple Watch?" Conan O'Brien on the Pip-Boy 3000.

[@barbibecks]

UBUNTU FTW

[@NeilOosthuizen]

Started off with a video from ***** about polaroid sunglasses and LCD screens and ended up here learning a bit more about LCD screens :) (oh also noticed Ubuntu)

[@streetDAOC]

Wat.

[@rtwilson145]

So that's why when you look at an LCD monitor through a camera it does that weird thing where it looks all choppy!!!

[@DearthXalex]

Travis Wilson I just realized that too!!! its so amazing to figure this out.

[@ocayaro]

Travis Wilson It's a heterodyning or stroboscopic effect due to differences in scanning rates. It's why looking at mags wheels of a moving car through a palisade fence makes the wheels appear to stationary or even rotate backwards. Same reason why the wagon wheels in old Westerns shot at less than 30fps appear to stop/rotate backwards when digitized at high modern rates.

[@SWellusionist]

Wow, wonder how 4K monitor works

[@-DeScruff]

If it's a traditional LCD, the same exact way except smaller subpixels. I think you are thinking of OLED screens.

[@TaufikAkbar7]

Sypran if i'm not mistaken LED screen is the opposite of LCD. it uses sooo many tiny LEDs to light up each sub-pixel, so it consumes less energy when displaying black/dark images

[@-DeScruff]

Taufik Akbar There are those kinds of screens, but they are not used for TVs or Computer monitors. I believe the Times Square Coke sign uses that kind of display. LED TVs are exactly like what Bill showed in the video. They are technically LED LCDs, and the big difference is that it uses LEDs instead of a florescent tube for back lighting. OLED I am not 100% sure how it works but it requires no back light making it lighter, thinner, and consume less electricity. No light is emitted when a pixel is absolute black. I believe one of the Zunes used an OLED screen and that is why all it's menus were white text on a black background.

[@TaufikAkbar7]

Sypran micro sized LED maybe? we can build micro transistor, why not LED? :D

[@-DeScruff]

Taufik Akbar That would be quite difficult and expensive to produce. Each LED for a 24" 1920x1080 screen would be 0.0828mm. They all need to be uniformly bright, all 6,220,800 of them. There are too many "joints" or parts that can go wrong, specially since LEDs are not the most refined technology at the moment. The Back light of an LCD is were most of the power inefficiency comes from, not the LCD screen it's self. In fact LCDs tend to draw not nearly as much power as a the LEDs that light them. Odd fact that sorta has to do with the subject: A Nintendo DS doesn't work unless it detects a certain amount of electrical resistance to it's top screen. It only cares though about the electricity to power the LCD not the back light. The amount of resistance from what I recall is about equal to the little power light.

[@wesjales5578]

What about samsung amoled screen. A screen that I have in my Nexus 6p phone.

[@НИКОЛАЙВЕЛОЗ]

try a teardown of a cathode ray tube

[@joelchristensen1226]

high voltage, probably too dangerous

[@НИКОЛАЙВЕЛОЗ]

i have disassembled a lot of CRTs before like 25 CRTs and im 17 old i started when i was 9 i just liked the way you explained the porocess of the functioning unit it's ok THANK YOU GOD BLESS YOU sincerely Nikolay Veloz

[@timmytim9054]

“Let’s see how this works” Casually takes a part of the panel while it screams in suffering

[@srpenguinbr]

why does my old tv has an extra pixel that is away from the others?

[@GoodOlKuro]

are you talking about a crt tv?

[@srpenguinbr]

those that were a big box

[@somemaycallthisjunkmeicall133]

Felipe Lorenzzon Those are CRT tvs. They don't work like this, they are different and obsolete

[@starkmouth]

and heavy as shit.

[@cameronmoore7675]

Engineers are the real-world equivalent of wizards, and we can't thank them enough for it.

[@decon4611]

This was the most comprehensive, easy to understand and short video I've seen on this topic! Thanks!

[@moviemakerwannabe]

When the LCD is broken from dropping or in some way injuring it there are usually lines or a line that is black, sometimes growing into a blackened area, sometimes not. What part of the screen has been damaged when this happens? and is that something a mediocre tech person can fix? Are there any dangers in opening up a broken LCD screen to work on it? Perhaps you could do a video? Thank you

[@tolsmadavid]

That happens when the glass panel containing the liquid crystal cracks. The liquid leaks from the glass panel and is completely unfixable, sorry!

[@roeltz]

I can rest in peace now.

[@frosty9392]

but why can only 1 row receive information at a time?

[@jamessmithers5206]

and does that last bit also somewhat explain refresh rate or no?

[@U5K0]

How do you modulate the intensity of each sub-pixel? Is it just a linear progression in LC voltage from black to white?

[@maskednil]

Bill, I really appreciate your videos. There's more to be learned from another articulate human being than reading text. Keep up the good work and release more videos. I look forward to them.

[@robertkielty5094]

I love Bill's videos. All of them. I would like to point out that at that in general, what we see as "modern" technological advances generally have a long history behind them that build on hundreds of years of scientific research. The scientific research input that went into the LCD display could (in part) be traced back to the 1800's when scientists were figuring out what exactly electricity was and how it worked. There were some flaming rows about that in Italy between Volta and Galvani. The BBC makes good documentaries on such history. Understanding the nature of light and how it can be polarized also goes back to that time in history. As each branch of the sciences makes discoveries and advances and pass that knowledge onto engineers everyone involved builds of work of those that have gone before and pass their work on to the next generation. This is why for a lot of modern technological devices such as PCs, LCD screens and hard drives we do not associate them with a single inventor. Science and engineering is a team game, a game that we seem to have only really started to get very good at over the past few decades but it is a game that we been playing for much longer than that. en.wikipedia.org/wiki/History_of_display_technology

[@etact8888]

Incredible video. Most would have just do it the ppt way. This is the channel that profound me as it have such a large subscriber base yet have no profit motivation (no sponsored product, no cheeky transition to some promotion etc) and stick true to just educating us, thumbs up!

[@omsingharjit]

2:09 i thought he will explain it by placing another polarizer between at 45’ angle

[@jonathancook4022]

it is trully remarkable. I have no idea how they are manufacted so well that my 5-year old LCD screens work just as well as the day they were purchased

[@jeremyandrews3292]

LCDs are great for mobility, but I don't know if I like them on the desktop and in my living room. CRTs look nicer than most LCDs. Only late-model PLS/IPS screens even come close. Plasma could rival CRT, but that didn't survive or spread outside of televisions. It does bother me a little that the only consideration for technology these days is how little electricity it uses, and how portable it can be. No one really cares about quality, modularity, or raw processing power anymore. It's great for all the iPhone/Android people that like doing stuff with their fingers, but it sucks for power users that like to touch type and find the new stuff limiting. It seems like every new piece of technology makes everything more locked-down, breaks a few pieces of backwards compatibility, and eliminates choice and configurability. LCDs eliminated the choice of using lower or higher resolutions without scaling, and using old-fashioned lightguns. Not a big deal at first. But then we start seeing all these phones and tablets that you can't replace the OS or upgrade the hardware on. Then you see laptops start to be built more like tablets. Then we got Windows 8 and GNOME 3 that are ridiculously Spartan and touch-oriented with few configuration options, like a phone/tablet. In Windows 10 Home Edition, you're stuck with whatever updates Microsoft pushes out and it's much harder to install a specific version of a driver other than the one Windows chooses by default. Office doesn't use menus anymore, they try to make everything touch-friendly and use these weird ribbons. Secure boot BIOSes might make it so that you can't get an alternative operating system installed at all. How long until they just stop making motherboards and monitors for people to make their own computers, and we're just left with 2-in-1 convertible laptops, and preassembled AIOs that are locked into whatever OS they came with? I guess it's frustrating to me because I know so much about computers and I know how to manipulate all these things, but they're slowly making the computer into something that I can't do anything with other than what the manufacturer intended. It's getting to a point where someone like me, with all my knowledge... can't do much more with a computer than the average person can, because there are no advanced options exposed anywhere. And what few there are get buried deeper and deeper until they disappear entirely. Everything that made technology interesting to me is going away. Now it's boring, locked-down, and easy. About the only thing that interests me these days is the Raspberry Pi, and the utility of that is extremely limited. It's basically just a tool for nerds to reminisce about how computers used to be as they come up with creative uses for them. Computers aren't for nerds anymore... they're for everyone else. Nerds and will have to find something else to interest them, because nothing interesting happens in technology anymore. Best time to be alive for that was probably between 1978 and 2006. Before that time, they were too simple and limited to do anything much more than act as a calculator, and after that time, they started taking features/options away to the point that a computer isn't much more interesting/configurable than a toaster or an alarm clock.

[@ar_xiv]

The scaling resolution thing is something I haven't thought about in a long time. CRTs rock for sure.

[@FiNiTe_weeb]

Use OLED if you want better power consumption.

[@Techno4more]

its rather ironic that you mention all of your "knowledge". it really sounds like you are a fool.. if you know so much, you would be able to manipulate the new technology to do what you want. you consider yourself a power user? lol get over yourself. never heard such self consumed nonsense. if you really think technology is regressing.. maybe it is you who is getting left behind. suck it up butter cup

[@jeremyandrews3292]

Fearbleeds With LCDs, the screen physically can't do those things because it works on an entirely different principle. You can adjust resolutions through scaling, and you can choose whether you want fast refresh rates via TN panels, good color reproduction and the best viewing angles with potential glow problems via IPS/PLS panels, or good viewing angles and black levels with decent color reproduction at the cost of slow refresh rates on VA panels. But those are all the choices you get. The CRT choice has been taken off the table, and while LCD is good enough most of the time, I do find myself in situations where I miss a feature or two that CRT had. With an NES game like Duck Hunt, you can't use the original Zapper to play it. That's because it relies on light of specific colors being emitted between blank frames... and LCDs don't work that way. I'm not a fool, I'm nostalgic. As far as other pieces of technology are concerned, the regression is not in power, but in freedom. Companies are locking down devices for the purposes of copyright enforcement (as well as security) and limiting what you can do with them. I can often bypass these things with a lot of work, but it's getting harder as they build these protections into deeper and deeper physical levels of the system, and try to design things so that they break beyond repair if you open them up and see how they work, putting glue in awkward places, etc. I'm frustrated that I now have to fight with a computer in order to regain even half the level of freedom I used to have with it, simply because manufacturers want to have control over how everything is used. A lot of users don't do a lot of odd things with their machines and probably don't notice this, because their use cases are covered by the manufacturer.

[@Techno4more]

+Jeremy Andrews ok I see what you mean. OLED displays are going to solve some of the issues, with refresh rates capable of 100,000 and infinite contrast. Technology is advancing incredibly fast. Sure you can't play duck hunt. But now you can walk in a virtual world. And yes companies like Apple take freedom away, but anything digital can be hacked pretty much. Where there is a will there is a way they say

[@dreamrecaller]

interesting video very quick and to the point, i learnt a lot!

[@jazmihamizan4987]

can you explain to me how broken lcd looked like leaking liquids mainly white?

[@JohnGibson02]

The weird thing is, I'm watching this from that exact monitor.

[@flaplaya]

Alien tech. Amazing breakdown of this considering 20 years ago it was CRT (Big stupid cube tv's and monitors).

[@BrokeTheInterweb]

This is really neat. It makes you feel cool for using an LCD, which is something almost everyone already does.

[@XFanmarX]

Absolutely ridiculous. And I can now pay for one with pocket change? Engineers don't get enough credit in the world. Geez!

[@vladsinger]

I love the background music. Reminds me of Finding Nemo.

[@RonakDhakan]

I have read a little bit about LCDs but this video makes it so much clear.

[@yalamandarao6327]

It still amazes me how could this guy master in all the engineering topics

[@MISTER__OWL]

As always your videos are educating me. Thank you so much.

[@psammiad]

Mmm, glass sandwich.... :P

[@tkabiranik]

I want to replace the front polarizer of my damaged Asus VX229H (21.5") IPS monitor. However, I am unsure of the angle of the view for an IPS polarizer. I found a 21.5" wide screen LCD polarizer, with 45 degree angle of view. Will that do the job or should I get a 90 degree one?

[@JackDD]

GNU/Linux? Good man!

[@davidreid-daly472]

Brilliant, I have tried to understand this for 20yrs and no one could tell me ! Why.......they obviously dont know, precisely, themselves........thanks soooo much !!!!

[@MohammedShahrukhKhan]

Thank u very much Engineerguy for the explanation, finally i understood How LCD Works........:-)

[@macewindu9011]

Excellent explanation - thanks

[@avangion80]

Nnnnnnnnice! Well explained. Always (until now) thought the LC makes the colours, but it actually "just" manages the light behind the pixelated TFT-layer.

[@wiz7716]

WOW.... thanks for the video, AMAZING! but then does that mean the one pixel (3 strips of RGB) is only a color coated layer consists of strips all along and each column is R G B coated and then just white light coming through and getting filtered so color is shown to us???

[@austinlindsay]

Your videos are always amazing.

[@GregoryTheGr8ster]

I utterly LOVE human ingenuity! This is fascinating! But please tell me that an American invented this. If not, then I might have to vote for Donald Trump. He has promised to make America great again. If other people are thinking of technologies like the LCD display, then America is falling behind. I don't like my country falling behind. That's not what happens to a great country.

[@adambechcinski]

That's a really fantastic movie explaining LCDs so much better than other youtubie moves... !!!!!!

[@brianbauer9399]

How awesome is this video and your other videos. Just recently discovered your channel. And this because I have a question about LCD screens. I have in the past few months managed to "fix" "damaged" lcd's they had ink blotches that made it look like it's better off in the trash. But as it is I'm always keen trying to fix things. So managed to move the ink blotches out. Do not it took months at a few hours per day not every single day either. How was this possible. I would really like if you could explain this to me. Thank you again for your videos and passing on your knowledge.

[@Juppie902]

TFTs still bad next to samsung AMOLED and can be found in cheaper chineese replacement parts for example for the popular samsung devices. I still prefer the expensive AMOLED.

[@koepketube]

Ever wonder why they had TFT on laptops before using them for desktops? Even today, I would very much like to have a .1" thick screen (from my ultrabook) for use on a desktop.

[@riverbear246]

Great video!! Now I understand why some call the MacBook Pro Retina displays "LED" and /or "LCD".

[@mattinuk]

Excellent video. Thank you. Respect and admiration for the individuals who invented and manufacture this technology.

[@CaptainSpock1701]

Me before watching -> O, this looks interesting Me after watching -> Now I find myself imagining a cellphone with a CRT screen!

[@JuanLeTwnz]

FINALLY understood it. All of the other explanations I've seen couldn't make me grasp the full concept, but this one is just perfect. Would be interesting to have a little more detail on the material the first few sheets are made of (which evenly distribute LED light).

[@MaxPMagee]

Great video. (subtitle has a typo- "EngnieerGuy's new book" should be "EngineerGuy's" of course)

[@kk-yy8oi]

Thanks for the video ... Really useful .. so what's the black marks like the water marks that follow your finger when you press on the screen? Sometimes I realize that when you press on the LCD monitor .. it will have a black marks and as soon as you release .. it slowly disappear.. will that damage the screen? What happened was I had a Nintendo switch and I didn't realize the cover was plastic and not like the cell phone which has glass .. so when I install the screen protector and you know how there are bubbles, so I have to apply pressure and push those bubbles away .. so by doing that , and since it's plastic ... Will I damage the LCD screen? Like when we press hard on the computer monitor ... I now worry Thanks

[@satish890]

all these filters and reflectors... yet i still have clouds and bleeds on my 2015 8-Series Samsung UHD TV