The active area of the device is surrounded
by an aperture on the inside DMD window surface that masks structures of the DMD chip assembly
from normal view, and is sized to anticipate several optical operating conditions. Overfill
light illuminating the window aperture can create artifacts from the edge of the window
aperture opening and other surface anomalies that may be visible on the screen. Design the
illumination optical system to limit light flux incident anywhere on the window aperture from
exceeding approximately 10% of the average flux level in the active area. Depending on the
particular system optical architecture, overfill light may have to be further reduced below
the suggested 10% level in order to be acceptable.