Specifications
MII#Il)-1472E
TABLE IV. Group viewing ofoptical projection displays’
-.— ..
.
.
FACTOR
““ ‘“”-”-”-::laJ=@~:-
viewing distance
Ratio of
screen diagonal
Angle off centerline
Image luminance (no film in operating projector)
35 Ccihl+
(10 ft-L)
I
‘Lurninanee variation across screen
I
(ratio of maximum to minimum luminance)
1
I
20’ 30”
27-48 Cd/~* ~ 17-70 Cd/d*
(8-14 ft-L)
(5-20 ft-L)
I
1.5
3.0
Luminance variation as a function of viewing
I
location (ratio of
maximum to minimum luminance),
I
I
1’
2.0
4.0 :
ambient light
IRatio of
[
brightest part of image
I
o
0.002-0.01 I 0.1 max”” I
“~-Forstill projections higher values may be used
** For presentations not involving gray scale or color (e.g., line drawings, tables) 0.2 may be used.
5.2.6.6.3 - hmimuxx and lkht distribution. Image hmimnce
and light distribution should
wtiom~ti _Hmdshti Mexti&~M&T~k N. Wmcn
center luminance at maximum viewing angle shall be at least half its maximum luminance.
5.2.6.6.4 Legibility of moiected data.
5.2.6 .6.4.1 &y& A simple style of numerals and letters shall be used. Capital letters (rather
than lower case) shall be used, except for extended copy or lengthy messages. Stroke width shtdl be
1/6 to Ii%of numeral or letter height, but maybe narrower fcx light makings on a dark background.
Stroke width shall be the same for all letters and numerals of equal height. Letter width, numeral
width, character spacing, and word spacing shall conform to 5.5.5.5,5.5.5.6, 5.5.5.10, and
5.5.5. I 1, respectively.
5.2.6 .6.4.2 Size. The height of letters and numerals shaII be not Iess than 3 mrac!(10 minutes)
and should be not l~than 4.5 mrad (15 minutes) of visual angle, as measured h the kmgew
tinticipa(eclviewing distance.
5.2.6 .6,4.3 Contrast.
5.2.6 .6.4.3.1 .,Luminanceratio. Under optimal ambient lighting conditions, the luminance ratin
\.W AMIL-IlDBK- i 908 ) should Ix 500.1. ‘Ilc
luImI~ancc riuw for Jicu’ing chiuls, prin[cd LCX(WIL1
other line umk ~’ia slidcf or opaqtle
prelectors Khan he not less than 5:1. For pmyxtions wh~ch tire
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