Specifications

MUATD-1472E
5.2.6.8,6 Viewing angle. The optimum viewing angle is perpendicular to the display. Viewing
angle of matrix or segmented displays should be not more than 35° off axis.
5.2.6.8.7 Emitter edor. Monochromatic displays shall use the following colors in order of
preference: green (555 rim), yellow (575 rim), orange (585 rim), md red (660 rim). Blue emitters
should be avoided. The sekcted color should be visible through laser protective (or other) eyewear
required to be worn by the user.
5.2.6.8.8 lntensi~ control. Where applicable, dimming controls shall be provided to maintain
appropriate legibility and operator dark adaptation level.
5.2.6.8.9 Display testing. See 5.2.6.7.5.
5.2.6.8.10 Location of red alphanumeric LEDs/se~mented displays. Red LEDs/segmented
displays shall not be grouped with or heated adjacent to red warning lights.
5.2.6.9 Eiectrolumineseent displays.
5.2.6.9.1 &. Electroluminescent (EL) displays may be used where system requirements
dictate the use of transilhninated displays. In addition, they maybe used instead of mechanical
instmments: They are lighter, use less panel space, require less power, produce no heat, distribute
uniform illumination, offer longer life, eliminate parallax, and provide display flexibility. EL displays
may also be used where sudden lamp failure could result in catastrophic consequences.
5.2.6.9.2 AManumeric character and sYrnbolsizes. The height of alphanumeric characters and
geometric and pictorial symbols shall subtend not less than 4.5 rnrad (15 minutes) of visuaJ angle.
A@hanumerical characters shall be upper case. Aircraft display characters and symbols that must be
read in flight shall subtend not less than 7 mrad (24 tin) of visual angle.