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Questions and answers
The operation of LCD readouts
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Crystal clearity
Q. How do liquid-crystal displays work?
A. Liquid crystal displays (LCDs) are transmissive devices, which means that light isn't created by the liquid crystals but is transmitted through it. An LCD display is constructed from two transparent polarizing panels which sandwich a liquid crystal surface in between.
Light permanently shines through the laminate display panel, but when voltage is applied to defined areas the crystal turns dark. This partially blocks the light shining through the panel and gives designers a technique they can manipulate and use to create the sequences that display words and numbers corresponding to various languages - as well as basic graphic representation.
The light is only partially blocked by dark crystals and as a result LCDs can't create deep blacks. This means their ability to create contrast is limited. High ambient light affects their ability to maintain display and their resolution is limited by the panel array.
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