LCD polarizers to double as organic photovoltaics in mobiles
The LCDs’ operation rely on tiny liquid crystal molecules that are sandwiched between the two polarizers, switched by tiny transistors to act as light valves for each individual pixel. The UCLA Engineering team created a new type of energy-harvesting polarizer for LCDs called a polarizing organic photovoltaic, which can potentially boost the function of an LCD by working simultaneously as a polarizer, a photovoltaic device and an ambient light or sunlight photovoltaic panel.
"I believe this is a game-changer invention to improve the efficiency of LCD displays," said Yang Yang, a professor of materials science at UCLA Engineering and principal investigator on the research."In addition, these polarizers can also be used as regular solar cells to harvest indoor or outdoor light." From the point of view of energy use, current LCD polarizers are inefficient, the researchers said. A device’s backlight can consume 80 to 90 percent of the device’s power. But as much as 75 percent of the light generated is lost through the polarizers. A polarizing organic photovoltaic LCD could recover much of that unused energy.
"In the near future, we would like to increase the efficiency of the polarizing organic photovoltaics, and eventually we hope to work with electronic manufacturers to integrate our technology into real products", Yang said. "We hope this energy-saving LCD will become a mainstream technology in displays." The researchers describe their coating method as being simple, suitable for large-area manufacturing processes. "The polarizing organic photovoltaic cell demonstrated by Professor Yang’s research group can potentially harvest 75 percent of the wasted photons from LCD backlight and turn them back into electricity," said Youssry Botros, program director for the Intel Labs Academic Research Office, which supported the research. "The strong collaboration between this group at UCLA Engineering and other top groups has led to higher cell efficiencies, increasing the potential for harvesting energy. This approach is interesting in its own right and at the same time synergetic with several other projects we are funding through the Intel Labs Academic Research Office."
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