Liquid Crystal Display

Watch liquid crystal display.

A polarizer parallel to that of the front layer does not obscure the display.

A polarizer crossed with the front layer blocks all light from the display.

A dichroic polarizer covers the liquid crystal display. The polarized light from the background is transmitted, but the part which makes up the numerals has been rotated 90° and is blocked, forming the dark areas. If a polarizer with axis perpendicular to the surface polarizer is placed over the display as in the top right image, the entire display looks black.

Crossed polarizers

Polarization concepts
HyperPhysics***** Light and Vision R Nave
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