What does a circular polarizer do?
Circular polarizers are efficient contrast enhancement filters and improve the sunlight readability. Ambient light passing through a circular polarizer is transformed to a polarised circular motion which when reflected from the surface of the display is rotated through 90°and can no longer pass back through the filter as the polarisation of the reflected light is out of phase with the polarising filter. The effect of this is that the background to the display appears dark blue or black. The signal from the display has not been polarised and appears very bright against this dark background. Return to top.
