Drive control method Ehime University develop envoying LED brightness double feeling

Kamino Masamitsu, associate professor of electronic and information engineering, Ehime University, Department of physiology and engineering research, the use of the human eye characteristics, the development of the LED can make the brightness of the pulse of the dual sensory control. When the duty cycle of LED is about 5% and the frequency is about 60Hz, the brightness of the human eye is about 2 times as compared with the DC voltage. Participants in the evaluation of the experimental results show that the use of blue LED can feel the brightness of 1.5 ~ 1.9 times, the green LED is from 2 to 2.2 times, the red LED is from 1 to. "Using this method, the luminous efficiency of 100lm/W LED can be achieved with the brightness of the 50lm/W simulation of LED" (field). The results have been published in the science and Technology Development Agency (JST) hosted the four new universities in four countries, the technical briefing. The way the human eye generally follows two rules. A Broca-Sulzer effect". Is to accept the instant flash like a shutter, the human eye is a few times the actual brightness brightness. However, after repeated acceptance of flash, the human eye will feel the average brightness of the repeated time, known as the "Talbot-Plateau effect". Previously it has been believed that, even if the Talbot-Plateau effect on the LED pulse drive, people feel the brightness will not change (God wild). God said, Talbot-Plateau effect is in the voltage cycle of several hundred ms or so low power driven mercury fluorescent lamp period found". Therefore, the thought of the voltage cycle up to hundreds of NS high-speed power supply to drive LED. As a result, when the duty cycle is about 5%, the frequency of 60Hz pulse voltage, the Broca-Sulzer effect is greater than the Talbot-Plateau effect, the human eye can feel a higher brightness. Experiments using three colors LED were manufactured by Nichia chemical industries, types of wavelength of 464nm blue LED as "NSPB500S", a wavelength of 520nm green LED as "NSPG510S", the red wavelength is 633nm LED for "NSPR510CS".

Source: Nikkei BP