Adding solar cells to liquid-crystal displays could help recover a significant amount of energy that's ordinarily wasted in powering them. Two research groups have created light filters that double as photovoltaic cells, a trick that could boost the battery life of phones and laptops.
Over 90 percent of the displays sold this year will use liquid-crystal display (LCD) technology. LCDs are, however, tremendously inefficient, converting only about 5 percent of the light produced by a backlight into a viewable image. The LCD in a notebook computer consumes one-third of its power.
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