Dell SE1918HV User Manual page 28

Brightness
Contrast
28 │ Operating the Monitor
Allows you to adjust the brightness or luminance of the
backlight.
Press the key to increase brightness and press the
key to decrease brightness (min 0 ~ max 100).
Allows you to adjust the contrast or the degree of difference
between darkness and lightness on the monitor screen.
Adjust brightness first, and adjust contrast only if you need
further adjustment.
Press the key to increase contrast and press the
to decrease contrast (min 0 ~ max 100).
key