5.2.7 Display luminance and contrast. Displays shall be
in accordance with MIL-STD-1472. For monochrome displays, luminance and
contrast shall be in accordance with the system specification and shall be
such that alert messages are easily readable from the design eye position (see
3.8) in any ambient light condition.
The minimum display luminance shall not be less than 1.5 fL to prevent the
dimming of the display to such a level that would make the alert message
unreadable. For color displays luminance contrast shall be in accordance with
the system specification and shall ensure the discriminability of the alert
message from the background.