Hi Chuck, I apologize for my earlier 'absent minded' question / comment as I "knew" HOEs could create a focal plane and be transparent, my mind was on another issue within it all (good excuse eh?). I had a dialogue a few years back with Tom Clarke at UCF who invented/patented for DARPA a see through hmd that he predicted would expand into Nintendo scale market use, which apparently hasn't happened as of yet. He sent me the full DARPA presentation publication package hot off the press. It showed a full goggle for army helmet screen then. I had a lengthy dialogue with him over eyeglass looking applications which he said could/would happen. I never was able to discern then whether multiple points focal depth adjustment was feasible which you allude to being possible. His design program needed only one fixed depth which was the usual 3+feet out to infinity. Even if an instant focal depth change is possible in HOEs, a problem remains (I believe) with Convergence Accommodation Disparity when seen in VR &or AR. The Virtual & Focused depths compete to your brain's detriment, which eventually can make you ill. This is of course only is an issue with 3D images &or real (AR) objects that display such a disparity. My question (also to any on wear-hard who may know) is; "can HOEs have variable focal depth changes happening in real time / 3D space and at differing points in the field of view?" This ability would eliminate the Convergence Accommodation Disparity. (I've looked on SPIEs sites without success) I remember reading that MicroVision's VRD claimed an ability to change focal depth separately per pixel in real time, but it is much more complex than an HOE. > If you're a photographer, "depth of field" takes care > of the problem of exact focal distances. I understand 'Depth of field' to be a subjective focal improvement, it doesn't change actual objective focal plane, just an improved apparent focal 'depth' that comes from aperture reduction shrinking the circles of confusion nearer in size to the focused points occurring on our retina. They then are similar to the actual focused plane points of a real focal improvement. A display wants a maximum aperture exposure, stopping down for better focus reduces intensity? > > > Do you know of the possibility of truly transparent holographic > > screens? > > You've seen the little round lens "granny glass" sunglasses? > I have my favorite 'floating eyeballs' a nice Halloween costume &/or accessory! > > They're commercially available. I can go get a pair of off the shelf > sunglasses, whose lenses have embedded holograms in them. > You've probably seen them -- they have "winking" eyes embeded > in the fronts of the lenses, or other stupid subjects like that. I saw > a pair for about $10, a few weeks ago. > > They're already commercially available. Just stick the hologram > on the inside, rather than the outside surface. > > It should be possible to implement the entire display optically, > not just the lenses, but...that would require a LOT of R&D to bring > it to fruition. > > > This image I saw in BW was not clear on it being opague or > > transparent, being at its far > > left eye scan limit it could be either, though I can't imagine how > > having a blinder would be > > at all friendly or ultimately marketable. > > Well, remember Roy Orbison? (The singer..."Prety Woman") > His sunglasses had very large "blinders" for the side temples, > and I can still buy that style today. It's not as big a problem as > you might think. > > But, my choice would be to maintain the ability to see in *all* > directions. > especially in the real AR world of buses and collisions (a bus company in UK sued the victim after getting out of the hospital for not looking where he was going!) > > -- Chuck Knight > ________________________________________________________________ > YOU'RE PAYING TOO MUCH FOR THE INTERNET! > Juno now offers FREE Internet Access! > Try it today - there's no risk! For your FREE software, visit: > http://dl.www.juno.com/get/tagj. Thanks Tris -- ÐÏࡱá -- Subcription/unsubscription/info requests: send e-mail with subject of "subscribe", "unsubscribe", or "info" toWear-Hard Mailing List Archive (searchable): http://wearables.blu.org
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