Resolution

The number of pixels in a projected image, expressed as horizontal × vertical (1920×1080 for 1080p, 3840×2160 for 4K). Higher resolution produces sharper images and crisper text on scoreboards and menus.

For golf simulators, 1080p is the practical minimum on a 10-foot screen viewed from 8 feet away — at that distance, individual pixels are still distinguishable on fine detail. 4K (UHD) is a meaningful upgrade and is increasingly standard at the $1,500+ projector tier.

Beware "supported resolution" specs that describe what the projector can accept as input, not what it can actually display. Native resolution is the number that matters.