Due to the ultra short throw design, the projector will be placed just inches from, and slightly below or above, the screen surface. The projector mounts inverted if placed above the screen.
For dealing with ambient light, the first choice in a screen surface would be a ALR (light rejecting) screen designed specifically for UST projectors. As there are no motorized or pull-down screens of this type (yet), if you need something that disappears when not in use, your alternative would be to go with a traditional screen surface such as a matte white, with little or no gain. 1.3 gain is about as high as is practical, and is what I use in my theater, and therefore used in most of the images in this review. Only the images with lots of ambient light taken “downstairs,” not in the theater, were taken with the Dell projector working with a Screen Innovations ALR type screen specific to UST projectors.
The more gain you have in a conventional screen, the darker the corners will be, as the severe projection angles to the corners lose additional brightness, as the higher gain screens will reflect less light back from those hard angles. The advantage of the traditional, but low gain screens, lies in lower cost and the ability to choose motorized or pull down versions.