ViewSonic has announced the X2000-4K, an ultra-short-throw projector that can be placed just 23 cm from a wall and still create a 100-inch projection. The ViewSonic X2000-4K outputs at 4K, has a 120 Hz refresh rate when set to 1080p, supports HDR and has built-in Harman/Kardon speakers, among other features.
https://www.notebookcheck.net/ViewSonic-X2000-4K-Ultra-short-throw-projector-announced-with-120-Hz-support.619020.0.html