Pixel density

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Pixel density is the number of pixels in a fixed distance. It is often measured in pixels per inch or PPI. A display's pixel density is different from its resolution, which is the total number of pixels across the display's width and height.

Pixel density in Virtual Reality

Virtual reality head-mounted displays require high pixel density because the screen is very close to the user's eyes. An HMD with low pixel density can cause blurring of words and objects, reduction of immersion and elimination of presence. In VR PPI is just as important if not more important than resolution.

As pixel density increases, lower persistence is needed to avoid blurring.

Pixel density of various HMDs

DevicesPixel Density
ANTVR
Acer Windows Mixed Reality Headset706 ppi
Apple Vision Pro
Daydream View
FOVE506 PPI
Figment VRDepends on the smartphone
Google CardboardDepends on the smartphone
HP Reverb G2
HTC Vive455.63 PPI per eye
HTC Vive Developer Editions??
HTC Vive Pro615 PPI per eye
Impression Pi400+ PPI
LG 360 VR
Lenovo Windows Holographic HMD
Meta Quest 2???.?? PPI per eye
OSVR HDK1401 PPI
OSVR HDK2441 PPI
Oculus Quest
Oculus Rift455.63 PPI per eye
Oculus Rift DK1215 PPI
Oculus Rift DK2386 PPI
Oculus Rift S
Oculus Santa Cruz
Pico G2
Pico Neo 2
Pico Neo 3 Pro
Pico Neo CV
Pimax 8K2 * 3840x2160
16.6 million total pixels
PlayStation VR386 PPI
Project Alloy
Samsung Gear VR (2015/2016)518 PPI - 577 PPI
Samsung Gear VR Innovator Edition515 PPI
557 PPI
StarVR484 PPI
Sulon Q
Valve Index
Wearality Sky