Specifications

MILSTD-1472E
limited in shadows and detail, such as animation and photographs with limited luminance range, the
luminance ratio shall be not less than 25:1. For images which show a full range of colors (or grays in
black-and-white photographs), the luminance ratio shall be not kss than 100:1.
5.2.6 .6.4.3.2 Direction of contrast. Contrast maybe either light on a dark background or vice-
vers~ except where superposition is used. For subtractive superposition (at the source), data shall be
presented as dark markings on a transparent background. For additive superposition (at the screen),
data shaIl be presented as light markings on an opaque background. Colored markings against colored
backgrounds of comparable brightness shall be avoided.
5.2.6 .6.4.4 Alignm
ent. Misregistration of superimposed alphanumeric data or other symbols
shall be minimized.
5.2.6.6.5 Keystone effects. Projector-screen arrangement shall minimize keystone effects
(distortion of projected data proportions due to non-perpendicularity between projector and screen).
5.2.6.7 Light emitting diodes (LEDs].
5.2.6.7.1 General. Unless specified below, LEDs shall conform to 5.2.2.
5.2.6.7.2 ~. I-Ells maybe used for transilluminated displays, including legend and simple
indicator lights, and for matrix (alphanumeric) displays, only if the display is bright enough to be
readable in the environment of intended use (enclosure, bright suniight, low temperature).
5.2.6.7.3 Intensitv control. The dimming of LEDs should be compatible with the dimming of
incandescent lamps.
5.2.6.7.4 Color coding With the exception of- alpha-numeric displays, LED color coding
shall conform to 5.2.2.1.18; however, red LEDs should not be located near red fights used as outlined
in 5.2.2.1.18.
5.2.6.7.5 km) testing
LED indicator lights with 100,000 hours or longer mean time between
failure (MTBF) shall not require the lamp test capabfity specifkd in 5.2.2.1.14.
5.2.6.8 Dot matrhdsegme
nted disnlavs.
5.2.6.8.1 General. The following provisions apply to those displays (LED, CRT, gas
discharge, liquid crystal, and incandescent) used to pment alphanumeric and symbolic information.
5.2.6.8.2 Use. Dot matrix, fourteen segment, and sixteen segment displays may be used for
apphcatkms m-g
intenMive mnputer !iyslums,ktmmmts, avionics, navigation, and
communication equiprneng where the pmstmtation of alphan~ric, vector-graphic, symbolic or real-
time information is quid. Seven segment displays shall he used only for applications requiring
numeric information.
5.2,6.8.3 Symbol &fti&ion. Dot matrix characters shall contain not less than 5 by 7 dots, with
7 by 9 preferred. If system requirements call for symbol rotation, dot matrix characters shall contain
not less than 8 by 11dots, with 15 by 21 prefemed.
5,2.6,8.4 .4!tyhmumerir character and
svmhol sires. Aiphwmmeric characters and svmtxds
shrill suhtencl not less than 4,7 mrad (16 rein) of visual angle. Aircraft display characters and symbols
II,, !I 111I,!. t h(l !.l.;i,I ill fli:llt <h; Ill <Ilht(vl(l not Its< th; m7 n-mad (24 rein) of visual anrlc
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