At Show Week 2022 Meta revealed the detailed specs of Quest 2’s LCD panel.
In a chat titled ‘Excessive-PPI Quick-Change Show Growth for Oculus Quest 2 VR Headsets’, Meta show engineer Cheon Hong Kim detailed the headset’s show structure and mentioned the design challenges of utilizing LCD for VR.
Quick Change LCD
It’s important that shows utilized in VR headsets solely illuminate the pixels for a small fraction of every body – a method known as Low Persistence. That’s as a result of every body represents a precise second in time, whereas in actual life as you rotate or transfer your head the sunshine arriving to your eyes will constantly change. If the pixels had been consistently illuminated, your eyes can be receiving mild for the unique place at the same time as your head turned, and your mind perceives this as movement blur. The unique Oculus Rift Growth Package shipped in 2013 had this downside, and it was solved in Growth Package 2 in 2014.
At excessive sufficient refresh charges – for most individuals above roughly 70 Hz – you don’t even discover that the show is totally black nearly all of the time. The primary wave of recent shopper VR – Oculus Rift, HTC Vive, and PlayStation VR – completely used OLED shows as a result of OLED pixels are self-illuminating and have an especially quick response time, so might be simply switched off for almost all of the body.
LCD shows had been initially thought unsuitable for VR, given the for much longer response time. However for the reason that launch of the Home windows MR headsets in 2017, a brand new sort of LCD panels known as ‘quick swap’ have grow to be accessible. These panels illuminate the backlight for a fraction of the body, after ready for the liquid crystal to “cool down”. Quest 2, like Oculus Go and Rift S earlier than it, use such a panel.
Detailed Specs & Structure
The 1920×3664 decision and 120 Hz max refresh price had been already publicly identified, however the speak revealed the panel’s actual 5.46 inch measurement and density: 773 pixels per inch.
It’s additionally noteworthy that Meta revealed the panel’s brightness – 100 nits. Remember that determine is when utilizing low persistence, so it might possible be a lot brighter if used exterior a headset.
Meta additionally revealed some attention-grabbing bodily properties of the show. Since Quest 2 has three IPD settings and two lenses however just one panel, solely a subsection of the panel is used without delay. And since the lenses are nearer to round than sq., the very nook of the show is rarely wanted – so it was merely minimize out to save lots of house.
This method of utilizing a single panel with an energetic space subsection means every eye really will get fewer than the 1920×1832 pixels listed within the Quest 2 specs on the Meta Retailer.
Display screen Door Impact
Cheon Hong Kim additionally went into element about a few of the particular causes of SDE – display door impact – in VR headsets:
These components are vital concerns when specifying and sourcing panels for VR headsets, however Cheon acknowledged Quest 2 has a few of the points outlined right here. Meta nonetheless hasn’t launched a headset totally free from the display door impact.
Within the conclusions slide, the important thing show decision spec of Quest 2 was revealed, the angular decision measured in pixels per diploma. Meta says Quest 2 has 21 pixels per diploma. The commonly accepted determine for “retinal” human eye decision is 60 pixels per diploma. Whereas VR headsets have been making strong developments – the Oculus Rift had roughly 14 pixels per diploma – there’s nonetheless clearly a protracted strategy to go.
Lastly, Cheon alluded to Meta’s future analysis and growth priorities – to achieve the human perceptual restrict of 60 pixels per diploma utilizing “excessive PPI micro shows” and “numerous foveation applied sciences”.