Screen size and viewing distance
The recommended image size for a viewing distance and content type.
- Standard
- ANSI/AVIXA V202.01:2016 (DISCAS); SMPTE / THX viewing-angle guidance
- ISO 21118
- Context
- Status
- Standard reference being re-verified
How to compare it
Image size vs viewing distance
DISCAS works from the smallest element height that must be legible, which suits business use. Home cinema uses viewing-angle guidance (often ~30–40° horizontal).
Deep cut
Image size vs viewing distance. Resolution visibility: at 20/20 acuity, one arcminute per pixel puts the 4K vs 1080p benefit at roughly closer than 1.5× the screen height. That's why 4K matters more on projectors than on TVs: people sit relatively closer to projected images.