The paper that came up with Apple Vision Pro's outward-facing display [pdf]

Re:The paper that came up with Apple Vision Pro's outward-fa... by AndrewKemendo on Thursday June 08, 2023 @02:48PM (#36246715)

An LCD simply turns "off" to display "black" - so the emissions stop (relative to surrounding pixel emissions)

With a projector, you can't "throw" nothing (aka black). As a result "projected black" is simply lack of projection.

In the case of a translucent or transparent reflection or waveguide surface - which is what the projection reflects off of - "black" is whatever the darkest part of the surface is. In effect whatever else is emitting from the surface that you're looking at will change the depth of "black" you get.

This is why the Hololens and other see through AR devices are always tinted, to set a higher threshold for "black" than the surrounding unaided view.

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Re:The paper that came up with Apple Vision Pro's outward-fa... by moron4hire on Thursday June 08, 2023 @03:40PM (#36247606)

It's more accurate to say than an LCD allows light to pass through a 100% polarizing filter. The are three layers of polarizing material. The two outer layers are at right-angle polarizations to each other and normally would be completely opaque on their own. When power is applied to the liquid crystal, it twists the crystal's polarization to be at a 45° angle to the other two layers, which then permits about 25% of any incident light to pass through.

An optically transparent waveguide display can use an LCD layer to block light coming through the front and then not render graphics on that area of the display. It will be opaque black at that point (though rather fuzzy around the edges, as the LCD won't be in focus).

Magic Leap 2 actually employs this technique. It's... a lot like the rest of the device: a good idea on paper.

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Re:The paper that came up with Apple Vision Pro's outward-fa... by AndrewKemendo on Thursday June 08, 2023 @04:09PM (#36248101)

That’s a fair response, though I hope you’d agree that in the context of discussing pass through Vs see through “black” the majority of use cases are indeed fully occluding/lit LCDs near eye and not ML style lenses.

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Re:The paper that came up with Apple Vision Pro's outward-fa... by moron4hire on Thursday June 08, 2023 @05:12PM (#36249152)

But you were talking about the Magic Leap, replying to someone talking about waveguides...

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Re:The paper that came up with Apple Vision Pro's outward-fa... by cbm-vic-20 on Thursday June 08, 2023 @04:38PM (#36248602)

Magic Leap.. How are they still around? And have a valuation in the billions?

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Re:The paper that came up with Apple Vision Pro's outward-fa... by moron4hire on Thursday June 08, 2023 @05:01PM (#36248986)

I don't know. I mean, their newest device is better than the HoloLens 2. But like, that's just a relative statement. Waveguide displays are still objectively dogshit.

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Re:The paper that came up with Apple Vision Pro's outward-fa... by dfsl on Thursday June 08, 2023 @06:12PM (#36249940)

HoloLens stopped being a focus of Microsoft and it shows in the product

https://tecl.ink/2023/06/apples-vision-pro-wearable-headset-...

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