About the LG UltraFine 4K Display
4k Displays For Mac
The 23.7-inch LG UltraFine 4K Display features a 3840 x 2160 resolution, a P3 wide color gamut, 500 nits of brightness, and built-in stereo speakers. Integration with macOS lets you control your display's volume and brightness without the need for physical buttons on the display.
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If you connect the display using the Thunderbolt 3 (USB-C) cable (included), it provides up to 85W of charging power to your MacBook Pro or MacBook Air. The display has two Thunderbolt 3 (USB-C) ports, and you can use one to connect to another 4K display.
If you connect the display using a single USB-C cable (included), it provides up to 85W of charging power to your MacBook or iPad Pro. The display has three USB-C ports and two Thunderbolt 3 (USB-C) ports that function as downstream USB-C ports (5Gbps) and offer additional connectivity and power to compatible devices and accessories.
System requirements and compatible Mac models
The LG UltraFine 4K Display requires a Mac with a USB-C port or Thunderbolt 3 (USB-C) port running macOS Mojave 10.14.5 or later, or an iPad Pro with a USB-C port.
The LG UltraFine 4K Display supports a resolution of 3840 x 2160 at 60Hz on these devices:
- iMac Pro
Learn how to connect multiple displays to your iMac Pro. - iMac introduced in 2017 or later
- Mac Pro introduced in 2019
- Mac mini introduced in 2018
Learn how to connect multiple displays to your Mac mini (2018) - MacBook Pro introduced in 2016 or later
- MacBook Air introduced in 2018 or later
- MacBook introduced in 2015 or later
- iPad Pro with USB-C
- Mac computers with Thunderbolt 2 ports using the Thunderbolt 3 to Thunderbolt 2 adapter
Learn how to adjust your display’s resolution.
If you have issues connecting the display
4k Display Monitor For Mac
- Get help with video issues if you still don't see an image when using the correct cable.
- If the LG UltraFine 4K Display doesn't power on or you don't see an image after following the steps in the article above, contact LG to get service for your display.
- You can download the LG UltraFine 4K Display owner's manual on the LG support page.
You can make all of your displays mirror each other, or extend your workspace with different apps and windows on each display. If you use an external display with your Mac notebook, you can also use closed-display mode.
Check your requirements
- Check the ports on your Mac to find out whether you need an adapter.
- Check how many displays your Mac supports: Choose Apple menu > About This Mac, click Support, then click Specifications. On the webpage that appears, the number of displays your Mac supports appears under Video Support.
Use extended desktop mode
Maximize your workspace with extended desktop mode, which lets you enjoy full-screen apps and windows on each monitor. Then, use Mission Control to organize apps and windows across your displays. If your Dock is on the bottom of your screen, it appears on any of your displays when you move your pointer to the bottom edge of your display.
Turn on extended desktop mode
- Make sure that your external display is turned on and connected to your Mac.
- Choose Apple menu > System Preferences, then click Displays.
- Click the Arrangement tab.
- Make sure that the Mirror Displays checkbox isn’t selected.
Arrange your displays or change your primary display
So that you can move apps and windows across your displays in one continuous motion, arrange your displays to match the setup on your desk. You can also change your primary display, which is where your desktop icons and app windows first appear.
- Choose Apple menu > System Preferences, then click Displays.
- Click the Arrangement tab.
- To change the position of a display, drag it to the desired position. A red border appears around the display as it's moved.
- To set a different display as the primary display, drag the menu bar to the other display.
Use video mirroring
With video mirroring, all of your displays show the same apps and windows.
Turn on video mirroring
- Make sure that your external display is turned on and connected to your Mac.
- Choose Apple menu > System Preferences, click Displays, then click the Arrangement tab.
- Make sure that the Mirror Displays checkbox is selected.
Use AirPlay
4k Display For Mac Mini
With Apple TV, you can mirror the entire display of your Mac to your TV, or use your TV as a separate display. To turn on AirPlay, follow these steps:
- Make sure that your TV is turned on.
- Choose in the menu bar, then choose your Apple TV. If an AirPlay passcode appears on your TV screen, enter the passcode on your Mac.
- Mirror your display or use your TV as a separate display:
- To mirror your display, choose , then choose Mirror Built-in Display.
- To use your TV as a separate display, choose , then choose Use As Separate Display.
- To turn off AirPlay, choose , then choose Turn AirPlay Off.
If you don't see in the menu bar, choose Apple menu > System Preferences, click Displays, then select the 'Show mirroring options in the menu bar when available' checkbox.
Learn more about how to AirPlay video from your Mac.