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[* black] In case you're wondering what a polarizer does...
[* black] And now time to drop some knowledge, science-style!
-[* black] Simply put, the backlight shoots light (duh) through a layer of liquid crystals that change its orientation as it passes through. Depending on the light is oriented the polarizing film either allows it to pass through or blocks it.
+[* black] To put it simply, the backlight shoots light (duh) through a layer of liquid crystals that change its orientation as it passes through. Depending on how the light is oriented the polarizing film either allows it to pass through or blocks it.
[* black] In order to control the passage of light through the display a voltage is applied to the liquid crystals which changes their orientation which in turn changes the orientation of the light.