Instructables
Picture of Polariscope From a Discarded LCD Monitor
Introduction:
A polariscope is two polarizers that are turned so that they block the light from behind. Transparent items, especially plastics, exhibit color bands when they are positioned between the plates. These bands and fringes are interesting as they are, but can also be used as components in other digital creations, similar to the way flames are used to create “Fiery Effects”.
LCD displays have a liquid crystal fluid between two polarized plates. These plates can be removed and used to make a polariscope. You can also photograph the patterns by using just one plate along with a polarizing filter on the camera.
 
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Step 1: Materials needed

Picture of Materials needed
An unwanted LCD monitor with no cracks in the screen.
Some single edge razor blades or thin knife blade.
Screwdrivers for removing the screen.
A light source to use with the polarizer screens. I used the screen of a discarded LED TV set.
Photo 1 shows the screen and the tools you need.

Step 2: Remove the screen

Picture of Remove the screen
The LCD monitor will probably have a shell that snaps together and is reinforced by screws. Remove the screws and pry it apart. The screen assembly is composed of two polarizers along with a white backing and various plastic diffuser sheets, all held together by a metal frame. 

Photo 2 shows two screen assemblies, the front of one and the back of another.

Step 3: Separate the two polarizer sheets

Picture of Separate the two polarizer sheets
Photo 4.jpg
Photo 5.jpg
The two polarizer sheets will be glued together with the liquid crystal fluid and associated electronics sandwiched between them, as in Photo 3.

Photo 4 shows how the sheets are held together by a white, rubbery, glue that needs to be softened by heat before you can insert a knife blade in there to separate the sheets.

Photo 5 shows how you slide a blade along the space between the sheets, being careful not to go too fast or separate them too far. It is easy to crack one of the glass polarizer sheets. The fluid between the sheets can be easily washed away once the sheets are separated.
Extremely ingenious!