Extend That Cord! Mac OS
You can use an external display or projector with a Mac notebook while its built-in display is closed. This is known as closed-clamshell or closed-display mode.
- Extend your Mac screen to your iPad. Choosing the option to extend your screen means that you can have one set of apps and browser tabs open on your Mac while having a completely different app.
- In case the Mac doesn’t have an HDMI port, you will connect the HDMI adapter to the thunderbolt port and then connect the HDMI cable to the HDMI adapter. Usually these ports are at the back of the Mac. Next connect the adapter or direct HDMI cable to the back or side of the TV. Then, turn on your MAC.
- Dec 18, 2020 If you're using a Mac with Apple silicon, you can connect a single external display to your Mac using one of the Thunderbolt / USB 4 ports. Docks don't increase the number of displays you can connect as an extended desktop. On Mac mini (M1, 2020), you can connect a second display to the HDMI port.
Check requirements
To use closed-display mode with your Mac notebook, here's what you need:
Connect your USB keyboard or mouse to your Mac or external display, or pair your Bluetooth keyboard or mouse with your Mac. If you use a Bluetooth keyboard or mouse, choose Apple () menu System Preferences, click Bluetooth, then verify Bluetooth is on. Connect your Mac to power with the AC power adapter.
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- An AC power adapter or an external display that provides power over USB-C or Thunderbolt 3 (USB-C).
- An external keyboard and mouse or trackpad, either USB or wireless.
- A USB-C to USB adapter or cable if you're using a USB mouse or keyboard with a Mac that has USB-C ports.
- An external display or projector.
Enable closed-display mode
- Connect your USB keyboard or mouse to your Mac or external display, or pair your Bluetooth keyboard or mouse with your Mac. If you use a Bluetooth keyboard or mouse, choose Apple () menu > System Preferences, click Bluetooth, then verify Bluetooth is on.
- Connect your Mac to power with the AC power adapter. Some external displays, like the LG UltraFine 5K, also charge your Mac.
- Connect your external display or projector to the appropriate port on your Mac. Use an Apple video adapter if necessary. Some external displays have a USB cable that needs to be connected to your Mac.
- After your Mac notebook's desktop appears on the external display, close your computer's lid. You might have to press a key or click your mouse to wake the external display.
If your external display or projector doesn't turn on after you connect it to your Mac, connect your display while your Mac is asleep or off, then wake or turn on your Mac.
Disconnect your display or projector
Before you disconnect your display or projector, put your Mac to sleep.
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Choose Apple () menu > Sleep, then disconnect your display or projector.
Extend That Cord! Mac OS