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Re: IBM Wearable HUD

From: <>
Date: Tue, 29 Dec 1998 15:44:44 -0500

> not sure which description of the ibm wearable you're referring to (i may
>not have seen them all), but i believe the prototype shown in japan was not
>heads-up, it was an occlusional HMD. see
>http://www.watch.impress.co.jp/pc/docs/article/980911/ibm_7.jpg.

A display in front of one eye IS a HUD for most people (heads-up
display).  Because the visual cortex "shares" the images between each
eye, a one-eyed occlusive display appears to overlay the graphics/text
on the physical world.  Exceptions are, of course, people with only
one functional eye or some "stray" eyes.

The distinction is between "see-through" and "see-around" displays
(terms I never liked).  Some people call them transmissive
vs. occlusive, but I'm not sure that's better.  

Hmm, maybe "transmissive" vs. "fused-image" is better.

> i have seen reference to the display being a microdisplay, like
>displaytech's LightCaster, http://www.displaytech.com/panels.html, or
>kopin's CyberDisplay, http://www.kopin.com/html/description.html, or like
>the trust LiquidImage M1 for that matter.

Microdisplay is the name of a company by Phil Alvelda.  

The IBM display uses the Kopin Cyberdisplay panel.

Most of the displays you mention are most commonly used in "fused
image" mode ;-)

In most instances I actually prefer this for the better brightness
and less cognitive load, though most people seem to think transmissive
is the only way to go when they first hear about portable HUDs.

					Thad Starner
					Georgia Tech/MIT Media Laboratory
					Wearable Computing Project

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