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.

[sandoval91402]

cool, it makes sense! Maybe that's why when you point a camera at a tv you get the lines that move across the screen.

[haloharry97]

how does oled tv work?

[bravicimo]

Can you explain why my computer has a very dim permanent background image?

[VinKhong]

I know some of these words...

[mycrapytv]

the law in 30 years?

[gcdm4]

What's even more amazing is how relatively cheap this piece of technology is.

[Bassection]

It's actually kind of mind blowing when you think about it.

[Oliver Huseyin]

So the row update system, is the reason you seem to get what looks like moving rows when you point a camera at a TV screen? but it would also be to do with the refresh rate and the fps of the camera being different?

[Atlas Vault]

Hey everyone. If any of you have the time, could you please tell me exactly what the screens in the optical system are made of? Thanks in advance.

[ayroman09]

From Wiki: In order to address a single shutter on the display, a series of electrodes is deposited on the plates on either side of the liquid crystal. One side has horizontal stripes that form rows, the other has vertical stripes that form columns. By supplying voltage to one row and one column, a field will be generated at the point where they cross.