Advantech IDK-1107WR-50WVB1 User Manual page 32

Note! Contrast Ratio definition (CR): The contrast ratio can be calculated by
the following expression.
Contrast Ratio (CR) = L255 / L0
L255: Luminance of gray level 255
L 0: Luminance of gray level 0
CR = CR (5)
CR (X) is corresponding to the Contrast Ratio of the point X (See Figure
A2)
IDK-1107WR-50WVB1 User Manual 26