What's behind the screen of your monitor?

Question

I mean, if you were to remove the glass or plastic, what would be making the images and colours that you're currently staring at? Are those images/colours just light cast onto clear glass? And when you turn your monitor off, why is it black?

Answer 1

Depends on the type of monitor you have - lets assume the old tube type monitor. In that case, the entire monitor inside the shell is a big vaccuum tube with something called an electron gun in the back. There is phosporous compounds on the back of the glass. The electron gun fires a particle beam at the back of the glass starting at the top left and then move to the right. WHen it gets to the right side, it goes back to the left and down a line (I won't got into interlacing - you can look that up). This continues until the beam gets to the lower right corner and then it shuts off and goes back to the top left and starts all over.

So, there is a constant beam going across your screen in that typewriter fashion - it happens many times per second (depends on the monitor - this is your refresh rate). What happens when the beam hits the glass - well, the phosphorous glows. For each little spot on the screen, there are three colors - red, blue, and green - that can be lit up by the particle beam. The combination of colors gives you the screen. The more spots you have that you can light up as a rgb unit, the better the resolution on your screen.

How is this electron gun moved? Well, it doen't really move. The direction of the beam is altred by electromagnets aroudn the yolk of the glass tube (the yoke is the smaller part near the back). power is applied to the magnets to control or bend the electorn beam. These control magnets are controlled by the inputs from the video card from the main pc.

So, if you opened up an old tube TV or tube based (analog) monitor, you will find a big vaccuum tube wiht wires running around it and a circuit board or two.

LCD and plasma work a bit differently.

Answer 2

Abbreviation of cathode-ray tube, the technology used in most televisions and computer display screens. A CRT works by moving an electron beam back and forth across the back of the screen. Each time the beam makes a pass across the screen, it lights up phosphor dots on the inside of the glass tube, thereby illuminating the active portions of the screen. By drawing many such lines from the top to the bottom of the screen, it creates an entire screenful of images.

Answer 3

the glass on your monitor (assuming you have a crt like your TV) is covered with sulfur and other chemical "paint" which funtion is to remain "lit" for a fraction of a second...
from the back of the tube an electrical current start to "jump" to the front (where the screen is) this "jump" is caused because the electrical current on the filament of the tube is on the order od the thousands of volts...
but that only creates a beam which only shows a dot on your secreen, so, what makes the shapes?.
there are tho electro-magnets that when anergized, they move this beam, side to side (also known as horizontal) and up and down, also known as vertical, the vertical moves on steps... 525 steps top to bottom, and starts again, 30 times per second (the whole 525 steps). in the mean time the other magnet makes de beam move side to side one cycle per each one of the 525 vertical steps, this way it seems like you have 525 lines to make a frame (30 frames per second) 525 for regular TV, 720 for ETV, 1080 for HDTV.
and the shapes? just as easy as varying the luminosity of the beam.
the color? well, in reality is not only one beam, there are three, one red, one green and one blue, and the combination of the luminosity of all three gives you all the shades of colors that you can appreciate on your screen...

did it help?

oh! and it is black because is a hollow tube and there is abscence of light... makes sense?

Answer 4

as that's you won't be able to. (truthfully there's a gadget that make your 2 1024 by ability of 768 video reveal instruments appear like a single 2048 by ability of 768 visual reveal unit to the equipment, yet i does not advise it. exceedingly as that's greater low value to:) purchase a clean video card with twin heads. they are low-priced, except you choose for a ripper gaming version, and could provide better video overall performance than any on-board video equipment.

Answer 5

Some are liquid crystal - LCD....