Dell U3821DW 37.5" 21:9 Curved IPS Monitor (Silver) - Manual (Page 41)

Operating the monitor
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Accessing the menu system
NOTE: After you change the settings, press the joystick to save the
changes before you proceed to another menu or exit the OSD menu.
Icon Menu and
Submenus
Description
Brightness/
Contrast
Use this menu to activate Brightness/Contrast
adjustment.
Brightness Brightness adjusts the luminance of the backlight.
Move the joystick up to increase the brightness level
or move the joystick down to decrease the brightness
level (min. 0 / max. 100).
Contrast Adjusts the Brightness first, and then adjust the
Contrast only if further adjustment is necessary.
Move the joystick up to increase the contrast level or
move the joystick down to decrease the contrast
level (min. 0 / max. 100).
The Contrast function adjusts the degree of
difference between darkness and lightness on the
monitor screen.