Ehime University Researchers Able to Trick Eyes into Perceiving Brighter LED
Source/Type: Reported News

Author: LIGHTimes Staff

April 8, 2008... A group of researchers at Ehime University reported that they have developed a way to make LEDs look twice as bright, based upon how brightness is perceived, according to a Nikkei Electronics article. Masafumi Jinno, an associate professor of Dept of Electrical and Electronic Engineering at Ehime University, led the group of researchers. The researchers concluded that if a short-cycle pulse voltage with a frequency of about 60Hz is applied to an LED at a duty ratio of about 5 percent, the same LED looks about twice as bright to human eyes as it looks driven by a direct voltage. Evaluation test subjects reported that a blue LED looks 1.5-1.9 times brighter while green and red LEDs look 2.0-2.2 and 1.0-1.3 times brighter, respectively.

Return to CompoundSemi        Return to SSLnet/LIGHTimes      Return to Solid State Lighting Design