I can confirm this sort of thing actually works... Somehow.
we use a similar technique at work to show/get passwords
[QUOTE=MasterFen006;42711805]I can confirm this sort of thing actually works... Somehow.[/QUOTE]
If you want an extremely extremely high level description so it doesn't seem like magic, without getting into how colours work the reason it is white is because light is passed through layers of liquid crystal which change its polarization depending on how much voltage is passed through them, and then the polarization film on the front of the monitor can filter out the light that does not match its own polarization, allowing us to create an image on the screen by passing more voltage through areas that we want to be darker and filtered out by the film on the front.
The reason it appears white to the naked eye is because our eyes can see light regardless of its polarization, so without that filter filtering out the light that has had its polarization changed while passing through the crystal layer, its the same as just shining a light into your eyes.
The 3D glasses you get in the cinema use the similar techniques; one eye is horizontally polarized so it blocks the vertically polarized image and vice versa for the other eye, which is why if you turn your head sideways you will often get some strange effects, or to the naked eye you get both images coming through both eyes since the polarization doesnt affect us, making it appear blurry.
If you wanted (I think it has been shown off/done before) you could have a TV with two pairs of glasses/headphones, and two people could be watching completely separate channels or one person could be playing on a console while the other watches TV.
the only application i can think of is secret pornography
[QUOTE=geogzm;42712475]the only application i can think of is secret pornography[/QUOTE]
If you have people walking by your screen a lot it'd be pretty funny to see what they say when they see you using a computer with a blank screen.
[QUOTE=Cushie;42712268]
If you wanted (I think it has been shown off/done before) you could have a TV with two pairs of glasses/headphones, and two people could be watching completely separate channels or one person could be playing on a console while the other watches TV.[/QUOTE]
3D TVs can do that, without any changing stuff around (if you have active glasses).
[QUOTE=endorphinsam;42712785]3D TVs can do that, without any changing stuff around (if you have active glasses).[/QUOTE]
That is exactly the thing of my childhood imagination!
can have related fun without needing to remove the polarisation filter from your screen
just looking through polarised glasses at an LCD monitor while rotating them slowly, or pulling the lenses out and putting them against the monitor and rotating it
also looking through the glasses at a transparent, plastic object (like a ruler), with an LCD monitor behind it - you'll see coloured distortions around the object which kind of show its stress (bend said object for more funtimes)
I know a guy who did this with his TI-89 so people next to him couldn't cheat on tests
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