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That charge, in turn, affects the third layer, which is made of liquid crystals.
ECONOMIST: Curtains for celluloid
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The alignment of the liquid crystals in the array controls the direction in which light is reflected from them.
ECONOMIST: Monitor
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JVC's approach is to use liquid crystals to block the polarized light that would normally reflect to the screen.
ENGADGET: JVCs 70-inch D-ILA set dwarfs the competition HD
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That, plus the fact that the liquid crystals will revert to transparency if the power goes off, mean an LCD eats batteries.
ECONOMIST: Electronic screens as thin as paper are coming soon
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Liquid crystals, often used in display screens, are sometimes quasicrystals, too.
ECONOMIST: The 2011 Nobel prizes
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By passing light from the palimpsest through a filter made up of liquid crystals, the researchers can adjust the wavelengths of the pictures that result by 10 billionths of a metre at a time.
ECONOMIST: The Archimedes palimpsest
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Applying an electric charge to the liquid crystals causes the molecules they are made up of to realign themselves, altering the transparency of that layer. (The screens of portable computers work in a similar way.) The result is that a high-resolution negative copy of the moving image is formed in the liquid-crystal layer.
ECONOMIST: Curtains for celluloid
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SmartGlass involves two panes sandwiching a film containing minuscule liquid droplets of these light-absorbing polyiodide crystals.
FORBES: As Clear As ...
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Tiny liquid crystal molecules are sandwiched between the two polarizers, and these crystals can be switched by tiny transistors to act as light valves.
ENGADGET: Photovoltaic polarizers could make self-charging smartphone dreams come true