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Technology Stocks : White light from LED -- Ignore unavailable to you. Want to Upgrade?

To: The Ox who wrote (271)	5/9/2000 10:09:00 AM
From: kinkblot	Respond to of 565

Kopin also uses an LED light source for their microdisplays. Before blue LEDs became available, they had to use three sub-pixels, each with a different color filter, to get colors including blue from a white source. Now they don't need to do that: they can display each color in all pixels by sequentially rotating the color of the source. This made life much easier for them. To enable full-motion video in this mode, it's necessary that the display be able to refresh at a rate of at least 180 Hz (60 Hz x 3 colors per frame). From the specs for Kopin's CyberDisplay 320C, within a complete 1/60 second frame each color LED flashes for about 620 microseconds, so the three LEDs combined are only on about 11% of the time. But, because of latency in human visual perception, this doesn't mean that perceived brightness is reduced proportionately. MVIS also takes advantage of this, I believe. kopin.com - see 2.2 Color Sequential Timing (p13) WT