there are 2 type of fixed screens, flat and curved. In the flat screen we have lost light but its more simple to build, so flat screen is perfect for non reflective screen (white matte screen) while the curved screen
is perfect for reflective paint ALR but its very dificult to buid, so if we build a fixed screen ALR flat screen we have to axept a little hot spoting. we can use three types of paints to paint the screen.. 1. Diffuse paint (white-grey wall) 2. Reflective Paint – Car Paint (ALR Paint) 3. Retro reflective Paint usualy used for trafic signs.But the best result for a black screen is obtain by using the reflective paint.. when using Alr Screen we have reduced viewing angle because its refletive .. so optimal view only from frontal direction so 3-4 seats in the front of the screen so around 45% viewing angle . iff you are situated more angular, the picture will be more dimm.