NL12880BC20-05
PRELIMINARY DATA SHEET DOD-PP-0936 (1st edition)
4.10.2 Definition of contrast ratio
Luminance of white screen
Luminance of black screen
4.10.3 Definition of luminance uniformity
The luminance uniformity is calculated by using following formula.
Maximum luminance from
①
to
⑤
Minimum luminance from
①
to
⑤
The luminance is measured at near the 5 points shown below.
4.10.4 Definition of response times
Response time is measured at the time when the luminance changes from "black" to "white ", or
"white" to "black " on the same screen point, by photo-detector. Ton is the time when the luminance
changes from 10% up to 90%. Also Toff is the time when the luminance changes from 90% down to
10% (See the following diagram.).
4.10.5 Definition of viewing angles
Luminance uniformity (LU) =
The contrast ratio is calculated by using the following formula.
Contrast ratio (CR) =
③
④
⑤
①
②
26
213
640
1067
133
400
667
100%
90%
10%
0%
Ton
Toff
Luminance
White
Black
Normal axis (Perpendicular)
12 o’clock
Left
Upper
Lower
θ
U
θ
D
θ
R
θ
L
Right
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