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A backlight.
First, the LCD has a backlight (which is not used).
The play occurs behind a taut sheet with a backlight.
Barnes & Noble's bargain basement device includes a backlight.
In LCDs, a backlight illuminates every pixel on the screen.
Since they emit light directly, OLED displays do not need a backlight.
A backlight, ambient light sensor and motion sensing make sure that it's readable at night too.
LCD displays, by contrast, filter light from a backlight through an array of tiny coloured filters and liquid-crystal shutters.
Mirror vision: This prototype display uses mirrors to generate a color picture without a backlight.
To fix that, some models add in a backlight so that you can read in the dark.
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Since the crystals themselves cannot produce light, it's necessary to provide a source-a backlight.
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