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 http://www.engineerguy.com/elements.

• Category

  Science & Technology

[CrazeViDofreak45]

Wait where are the polarized films located at in the glass sandwich? Is one polarized film in the front the TFT layer and one at the very back of the sandwich? or what? Im confuse O.o

[engineerguyvideo]

Yes. One is on front and one is on back. They are rotated relative to each other by 90 degrees .... the liquid crystal between them changes the polarization of any light passing between them.

[Xamil2]

Hello, I look everywhere about connections of the transistor in LCD screens and I can't find anything. How all transistors are controlled? I mean: if I have a Full HD screen, it has over 6 millions transistors, so how are they connected to control unit? Is there a Integrated circuit, which has a 6840 (1920*3 in horizontal plus 1080 in vertical) wires coming to it? I'm sorry for my English and I hope You understand me.

[song liping]

Thanks for the information

[Inkieto92]

this is really interesting... I guess I loved this video because Im majoring in Electronics Engineering Technology haha.

[Mohammad Abu Talib]

You're just amazing guy... :)

[Samer Abuthaher]

It has some sort of integrated circuit called an "LCD controller".

Basically, instead of sending the information in ~7000 wires (this is said to be in parallel), they use fewer wires to send pulses in a rapid succession, aka serially, and the LCD controller decodes those pulses and sends the signals to the transistors.

Depending on the specific connection method the number of wires and whether the communication is digital or analog differs.

Hope I helped :)

[CaryTheEagle]

Imagine phones that use cathode ray tubes.

[egyp seals]

we are waiting on pins and needles for your explain about the other types of screens like OLED , transparent hologram and 3Ds screen

[egyp seals]

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

thank you

[Greeblimus]

I'm a student at the university of Hull, England, where these LCD screens were first developed. Something the Chemistry school likes to flaunt at every oppertunity XD

[Raydon Zeus Pierre]

I love your shit meign!

[vevefaux]

That last part explains why sometimes when you video tape a computer there seems to be lines running down over the screen. Thay must be the charge running down through each row and the camera doesnt have fast enough fps to catch it. So interesting!!