Dell UltraSharp 38" 1600p Curved Monitor - Manual (Page 58)

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