Advantech IDK-2110R XGA Series User Manual page 33

Note4 Definition of Luminance Uniformity:
Measured Maximum luminance [L(MAX)] and Minimum luminance [L(MIN)]
on the 9 points
Luminance Uniformity is calculated with the following formula:
L =[ L(MIN) / L (MAX) ] X 100%
Note5 Definition of Viewing Angle
27 IDK-2110R XGA User Manual