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How does an LCD display work?
Take a look at this video to see how a liquid crystal display (LCD) TV screen works. For more information, see this Case Western Reserve page.
The molecules of a liquid crystal have a tendency to line up, rather than point in random directions. For more, see these pages from Kent State University and from Simon Fraser University.
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Liquid Crystal IR Detector
Go to Liquid Crystal IR Detector for an experiment that shows how a liquid crystal can detect infrared radiation.