A Note on LCD TVs
LCD televisions are flat-panel displays that work by controlling the amount and intensity of light that passes through its screen. Think of LCD TV monitors as liquid-crystal sandwiches: They consist of two, perpendicularly arranged panes of polarized glass "stuck together" by a liquid-crystal-filled polymer solution. When exposed to electrical currents, these liquid crystals untwist to varying degrees, thus permitting specific amounts (and colors) of light to pass though them. LCDs are projection TVs that depend on a super-bright lamp as their light source, so they're a passive display technology.
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