Dell U3014t manual Contrast, Input Source

Icon	Menu and	Description
	Submenus

Brightness/Contrast Use this menu to activate Brightness/Contrast adjustment.

Brightness	Brightness adjusts the luminance of the backlight.
	Use the	button to increase brightness and push the	button to decrease brightness (min 0 ~ max 100).

NOTE: Manual adjustment of Brightness is disabled when Energy Smart or Dynamic Contrast is switched On.

Contrast	Adjust Brightness first, and then adjust Contrast only if further adjustment is necessary.
	Push the	button to increase contrast and push the	button to decrease contrast (min 0 ~ max 100).
	The Contrast function adjusts the degree of difference between darkness and lightness on the monitor screen.
Input Source	Use the Input Source menu to select between different video signals that may be connected to your monitor.