How to Turn Off Your MacBook Display When Using an External Monitor

Working with multiple displays can significantly boost your productivity, but managing your MacBook's built-in display alongside an external monitor isn't always straightforward.

Let's explore different methods to optimize your setup, including their benefits and potential drawbacks.

Using Clamshell Mode

Clamshell mode is Apple's native solution for using your MacBook with an external display. To activate it:

1. Connect your MacBook to power
2. Connect your external display
3. Close your MacBook lid

While this method works reliably, it comes with several limitations:

• Requires constant power connection
• Blocks access to the built-in keyboard, trackpad and Touch ID
• Can lead to heat buildup due to reduced ventilation
• May affect battery longevity due to constant charging

The Brightness Reduction Method

Some users opt for a workaround: keeping the MacBook open while reducing the built-in display's brightness to zero. This approach:

• Allows access to the built-in keyboard and trackpad
• Maintains Touch ID functionality
• Provides better ventilation

However, the screen is only being mirrored instead of being transferred to your external monitor. The Macbook built-in display still consumes power and generates heat, as dimming the brightness doesn't actually turn off the display panel.

Alternative Display Management Options

For users seeking a simpler solution, dedicated display management tools like Mac Display Off provide greater control over your setup. This approach offers several advantages:

• Actually turns off power to the built-in display
• Reduces energy consumption
• Eliminates heat buildup
• Maintains full functionality without requiring constant power connection
• Preserves access to built-in peripherals and Touch ID

Best Practices for External Display Usage

Regardless of your chosen method, consider these tips for an optimal setup:

• Position your external monitor at eye level to maintain good posture
• Ensure proper ventilation around your MacBook
• Use appropriate display scaling settings for comfortable viewing
• Consider using a laptop stand for better ergonomics

Making the Right Choice

Methods Comparison Summary

The best approach depends on your specific needs:

• Choose clamshell mode if your environment is cool and you don't mind keeping your MacBook plugged in all the time
• Use brightness reduction if you need a quick, temporary solution
• Consider a dedicated tool like Mac Display Off for simpler control and energy efficiency