First I projected directly onto the white wall, which was great at first. Then I painted a wooden panel with dispersion paint and the image is absolutely superb. In the living room, I have an Elitesreen 100" HT screen with a good Epson projector, which is also very beautiful. And the quality of the images, not to mention the fact that these are two different video projectors, is surprisingly low, if not non-existent.

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I bought mine at https://www.elitescreens.ch and am very satisfied :-)

Tip: There are also "too big", so measure well before buying!