Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!usc!zaphod.mps.ohio-state.edu!uakari.primate.wisc.edu!aplcen!haven!udel!berryh
From: berryh@udel.edu (John Berryhill)
Newsgroups: sci.electronics
Subject: Re: LED refresh rate
Message-ID: <21217@nigel.udel.EDU>
Date: 6 Jun 90 15:02:12 GMT
References: <30513@cup.portal.com> <61580@sgi.sgi.com> <30550@cup.portal.com>
Sender: usenet@udel.EDU
Reply-To: berryh@udel.edu (John Berryhill)
Distribution: usa
Organization: University of Delaware
Lines: 13

In article <30550@cup.portal.com> John_A_Pham@cup.portal.com writes:
> 
>     Ooops, I should make that clearer.  I want the refresh rate for LED
>that a human eyes can tell between an OFF and ON cycle.  Heck, for 
>1mhz or faster, LED will just fully lit to the human eyes

Although the persistence of visual images depends upon intensity and
color, 15 Hz is generally the point where you can't quite tell whether
an LED is on steadily or flashing.

--
							      John Berryhill
					   143 King William, Newark DE 19711