Dell ST2320L Monitor - Manual (Page 16)

Brightness
Contrast
Back
Brightness adjusts the luminance of the backlight.
Press the button to increase the brightness and Press the button to decrease the brightness (min 0 ~ max 100).
Adjust the Brightness first, and then adjust the Contrast only if further adjustment is necessary.
Press the button to increase contrast and press the button to decrease contrast (min 0 ~ max 100).
The Contrast function adjusts the degree of difference between the darkest and lightest areas on the monitor screen.
Press the button to go back to or exit the main menu.
Auto Adjust Even though your computer recognizes your monitor on startup, the Auto Adjustment function optimizes the display settings for use with your particular setup.
NOTE: In most cases, Auto Adjust produces the best image for your configuration.
Input Source
Auto Select
The Input Source menu is to used to select between different video signals that may be connected to your monitor.
Scan for Sources. Push to scan for available input signals.