3 ms·

Is there more detail/discussion on the optics posted anywhere? It would be nice to see some info like PPD across the image area, distortion (corrected and uncor

by lhl 5y ago

Is there more detail/discussion on the optics posted anywhere? It would be nice to see some info like PPD across the image area, distortion (corrected and uncorrected) and chromatic aberration, pupil swim/eye box, focal distance, and some other display details like contrast, black levels, brightness - I've been interested (and spent a fair bit of time working on a POC several years ago) in VR workspaces, but shelved my work due to the lack of HMDs with sufficient visual quality/comfort. Lately I've been interested in the newest upcoming micro-oled/pancake lens wave of devices (Arpara, MeganeX, etc) which seem to hit decent PPDs at reasonable price points. $3K doesn't seem entirely unreasonable but it makes me wonder - the XR2 has 3K/eye support and does all the hard work for device design, 6dof, and you could probably work with an ODM like Goertek to get an almost finished product at a fraction of the price? Also for hand tracking, are you planning to integrate something COTS like an Ultraleap 170?

kanetw 5y ago
We could make a blog post about it. I feel like a lot of it is going to be super technical for most people, though. Here's what I can answer off the top of my head. Centroid separation for lateral color is roughly 0mm for 0-30 degrees then sharply decreases at about -0.1mm/5 degrees When eye is rotated 25 degrees horizontally, pupil swim is within 10-20 arcmin for (+-40 V, 0-40 H) field angles. This is already fairly low, but we also plan to correct it with eye tracking if it's noticeable. Allowable eye shift is +-2mm, eye box accounting for eye rotation is around 18mm. Full 20um RMS spot size in that region for the foveal region (+-25 deg). Display is a LCD panel. 600:1 contrast, 150 nits brightness, 83% NTSC. We actually considered pancake lenses, but the low transmission (15% in a pancake design vs ~85% in ours) and the ghost image issues made us step away from them. XR2 does all the hard work, but Qualcomm pretty much ignored us when we messaged them. Besides, it'd pretty much be dead weight since we want an x86 processor for our primary use case as a laptop replacement. And yeah we're planning to integrate the Ultraleap module if they get their Linux software sorted. If not, there's fallbacks. (I think we also messaged Goertek and got nothing, so... a big part of why we're doing this, and will likely open source most of it, is that all the usual vendors didn't talk to us)

by lhl 5y ago

kanetw 5y ago

We could make a blog post about it. I feel like a lot of it is going to be super technical for most people, though. Here's what I can answer off the top of my head. Centroid separation for lateral color is roughly 0mm for 0-30 degrees then sharply decreases at about -0.1mm/5 degrees When eye is rotated 25 degrees horizontally, pupil swim is within 10-20 arcmin for (+-40 V, 0-40 H) field angles. This is already fairly low, but we also plan to correct it with eye tracking if it's noticeable. Allowable eye shift is +-2mm, eye box accounting for eye rotation is around 18mm. Full 20um RMS spot size in that region for the foveal region (+-25 deg). Display is a LCD panel. 600:1 contrast, 150 nits brightness, 83% NTSC. We actually considered pancake lenses, but the low transmission (15% in a pancake design vs ~85% in ours) and the ghost image issues made us step away from them. XR2 does all the hard work, but Qualcomm pretty much ignored us when we messaged them. Besides, it'd pretty much be dead weight since we want an x86 processor for our primary use case as a laptop replacement. And yeah we're planning to integrate the Ultraleap module if they get their Linux software sorted. If not, there's fallbacks. (I think we also messaged Goertek and got nothing, so... a big part of why we're doing this, and will likely open source most of it, is that all the usual vendors didn't talk to us)