The technology behind an LCD is similar to the polymer dispersed liquid crystals (PDLCs) used in some smart-window applications. In these windows, the liquid crystals respond to an electrical charge by aligning parallel and letting light through.
LCD screens have replaced heavy, bulky and less energy-efficient cathode-ray tube (CRT) displays in nearly all applications since the late 2000s to the early 2010s. LCDs can either be normally on (positive) or off (negative), depending on the polarizer arrangement.
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