OS X Mavericks: Adjust your display’s brightness
If the images on your display are too light or too dark, you can adjust the display’s brightness.
- Use the brightness control keys. On portable computers, and if you’re using an Apple LED Cinema Display, the brightness control keys are usually the F1 and F2 function keys. On some computers, they’re the F14 and F15 function keys.
- If you have a Mac with ambient light sensing, choose Apple menu > System Preferences, click Displays, then click Display. Select “Automatically adjust brightness.”
- Choose Apple menu > System Preferences, click Displays, then click Display. Drag the Brightness slider to adjust the brightness of your display.
- Check the documentation that came with your display to find out how to control its brightness.
Depending on the type of display connected to your Mac, the Display pane of Displays preferences may contain a Contrast slider that you can use to adjust the display’s contrast.
You cannot adjust the brightness of some older Apple displays. In OS X Mavericks and later, the Brightness slider may no longer appear in the Displays pane of System Preferences.