Advantech IDK-1115WP-45FHA2 User Manual page 31

Note! 9-point luminance uniformity is defined by dividing the maximum lumi-
nance values by the minimum test point luminance
Minimum [L (1) ~ L (9)]
=
W5
Maximum [L (1) ~ L (9)]
Note!
Measurement method
The LCD module should be stabilized at a given temperature for 20 min-
utes to avoid abrupt temperature changes during measurement. In order
to stabilize the luminance, the measurement should be executed after
lighting the backlight for 20 minutes in a stable, windless, and dark
room.
Figure A.2 9-Points Position
25 IDK-1115WP-45FHA2 User Manual