Replacing polarizers

[Logistics]

I was just reading about a trick where you remove the outer polarizer from an LCD, and attach pieces to glasses so only you can see what's on the screen.

Then I started wondering if it's possible to upgrade a cheap LCD with higher quality (higher definition) polarizers, at least the outer polarizer.

Also, I remember my Dad's 50" big screen (rear projection) TV had a "comb filter", and I'm not certain it polarized the picture from the three CRT's because it had a mirror inside, but even in the case of that old TV, would it have been possible to update it with a finer comb filter for better picture?

[Logistics]

Re: Replacing polarizers

What I thought was the comb filter, was the big, plastic panel that you actually see the picture on. I guess this is in fact a polarizer. Same query, though--can it be replaced with something better?

[budm]

Re: Replacing polarizers

Comb filter is electronics:
http://www.cockam.com/vidcomb.htm
There is no polarizer filter used in the old CRT projection TV, it has Fresnel LENS.
http://www.instructables.com/id/Salv...ar-Projection/

http://lcd-parts.com/polarizer.aspx
http://www.lcdparts.net/Film3D.aspx
https://www.youtube.com/watch?v=sPI5Ug7nNB0

[Logistics]

Re: Replacing polarizers

Then I wonder if I could get a higher quality fresnel for a big screen. I'd love to have my dad's old Mitsubishi 50" back for playing old console games.