ALR screen

An ALR, or ambient light rejecting, screen uses an angled or layered surface that behaves differently depending on where the light is coming from. Light arriving from the projector, typically ceiling or shelf mounted, gets reflected efficiently toward the seating area, while light coming from windows, lamps or wall fixtures at other angles is absorbed or redirected rather than bounced back at the viewer.

This matters most in rooms that cannot be fully darkened, such as a living room used for movie night rather than a dedicated blacked-out theater. A standard white or gray screen simply reflects all light equally, which washes out contrast and color the moment any ambient light hits it. An ALR screen preserves noticeably more of the image's black level and punch under those same conditions.

A common mistake is expecting an ALR screen to solve every lighting problem on its own, when projector placement still matters since these screens are tuned for a specific range of projection angles. Pairing the wrong throw angle with an ALR screen can actually create hot spots or uneven brightness, so it helps to check a screen's rated angle range before buying one.