MIL-PRF-22885/90C
Color and luminance: See tables II and III for display type S.
See tables IV and V for display type N.
Sunlight readability (display type S):
Requirements: All legends shall be capable of being read in direct sunlight and at any glare producing,
specularly reflective angles up to 15° ±2°C to the normal of the display viewing surface. The minimum
average luminance contrast ratio of each lighted legend character to background shall be 0.6 minimum,
except 0.4 minimum for blue and NVIS compatible colors. The average luminance contrast ratio of each
unlighted legend character to background shall have an absolute value equal to or less than 0.1. The
minimum average shall have an absolute value equal to or less than 0.1. The minimum average luminance
contrast ratio for each color shall not be less than the values listed in tables VI and VII for the respective
glare producing angle.
Test method: The test procedure for measuring the average luminance contrast ratios for sunlight readability
shall be the specular reflectance test in accordance with MIL-PRF-22885.
Visible legend (display type N):
Requirements: All legends shall be visible white with an opaque background. The legend characters shall
always be visible in any light ambiance except in darkened conditions. In darkened conditions the legend
characters shall illuminate in color with an average luminance of 0.5 to 3.0 foot-lamberts when energized at
full rated voltage. See tables IV and V for specific colors and luminance.
Test method: The test procedure for measuring the average luminance and color of the illuminated visible
white legend characters shall be in accordance with MIL-PRF-22885.
Night vision goggle (NVG) compatibility:
Requirements: The chrominance and luminance of the legend characters shall be compatible with NVIS
(Night Vision Imaging System) goggles as specified in MIL-L-85762. The NVIS Green A color shall be within
a circle where u'1 = .088, v'1 = .543 and the radius = .037 when the legend luminance is set at 0.1 foot-
lamberts. The NVIS Green B color shall be within a circle where u'1 = .131, v'1 = .623 and the radius = .057
when the legend luminance is set at 0.1 foot-lamberts. The NVIS Yellow color shall be within a circle where
u'1 = .274, v'1 = .622 and the radius = .083 when the legend luminance is set at 15.0 foot-lamberts. Formula
I is solved for the radius r to confirm compliance for any of the three colors. See figure 7 for NVIS color
limits.
The spectral radiance of the legend characters shall be compatible with NVIS goggles as specified in
MIL-L-85762 where NVIS radiance (NR) is defined. The NVIS Green A spectral radiance output shall not
exceed 1.7 x 10-10 NR for type I, class A and shall not exceed 1.6 x 10-10 NR for type II, class B goggles when
the legend luminance is set at 0.1 foot-lamberts. The NVIS Green B spectral luminance shall not exceed 1.7
x 10-10 NR for type I, class A and shall not exceed 1.6 x 10-10 NR for type II, class B goggles when the legend
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luminance is set at 0.1 foot-lamberts. The NVIS Yellow spectral radiance output shall not exceed 1.5 x 10
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NR nor be less than 5.0 x 10 NR for type I, class A goggles, and shall not exceed 1.4 x 10 NR for type II,
class B goggles when the legend luminance is set at 15.0 foot lamberts.
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