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From: maj@hpfinote.HP.COM (Mike Jassowski)
Newsgroups: sci.electronics
Subject: Re: HeadsUp Display ( WAS Re: Big Screen Projector from tiny LCD TV ? )
Message-ID: <15880017@hpfinote.HP.COM>
Date: 30 Aug 90 17:35:43 GMT
References: <2916@anasaz.UUCP>
Organization: Hewlett Packard CICD
Lines: 13


	Greetings. And how does the "focus at infinity" work?
	I presume you would need lenses - acrylic as to not
	have 40 lbs on you head? 
----------
I imagine you are asking how a heads up display focuses at
infinity without a bunch of lenses?  I had a holography class which
discussed this many years ago.  They used a projector with a
holographic lens to project the images onto the cockpit windshield
with an apparent focus of infinity.  I'd imagine that there is some
pretty good literature on this available for more detail on
specifications for the holographic lens.
-- Mike Jassowski