If the control affects White Luminance then you will see the four blocks of gray change
in intensity. You may even see the third block disappear (turn White) as you adjust
the control to its maximum setting.
Distinguishing Brightness from Backlight
If your monitor has only one control with a sun symbol, then to determine whether
this is a brightness or a backlight control, try the following test. Bring the On Screen
Menu up on your screen from the front panel controls. Adjust the control all the way to
the bright end, then scroll back all the way to the dark end. If the On Screen
Menu becomes illegibly dark along with the rest of the screen, then this is a Backlight control; if the On
Screen Menu remains visible while the rest of the screen goes dark, then this is a Brightness control.
Brightness and Contrast
LCD MONITORS AND PROJECTORS
If you have two controls, either labeled explicitly Brightness and Contrast or with the
symbols above, then you have Brightness and Contrast controls. On some displays the
Brightness control is labeled as Black Level.
The Brightness control will be used to adjust the Black Luminance level of the display
device. If you have a Brightness control, you can confirm that it actually affects the
display’s Black Luminance by observing the following image while you adjust the
control across its range from maximum to minimum:
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