TOKYO, Feb. 11 -- Nichia Corp. said it has developed surface-mount white LEDs with a luminous intensity fifty percent higher than current parts. The increased brightness results from a more efficient conversion of electricity to emitted white light, making the part useable in backlighting of full-color LCD screens in battery-powered mobile devices, the company said. "Color displays have always been a big improvement over black and white," said Noboru Tazaki, managing director and general manager of Nichia's Optoelectronics Products Division. 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