Questions & Answers for LG UltraFine 4K Display

No.

The LG UltraFine 5K Display is a Thunderbolt 3 display which uses both DisplayPort connections of the computer's Thunderbolt controller. The Thunderbolt controller sends both DisplayPort signals to the Thunderbolt controller of the LG UltraFine 5K over the Thunderbolt cable. The Thunderbolt controller in the LG UltraFine 5K converts both Thunderbolt DisplayPort streams back into DisplayPort to be used by each half of the display (the left and right sides) to support 5K resolution.

That is also the reason why the LG 5K display does not have a second Thunderbolt 3 port - because it is required for one of the DisplayPort signals for one half of the display. The other DisplayPort signal comes out of a DisplayPort connection of the Thunderbolt controller of the display (think of a Thunderbolt 3 dock where you can connect one display to the second Thunderbolt 3 port of the dock, and another display to a DisplayPort output of the dock).

The Thunderbolt controller of the computer does not have a third DisplayPort connection, and since the LG 5K uses two DisplayPort connections (over Thunderbolt), an LG 4K display cannot be daisy chained to the LG 5K display.

Also, since a Thunderbolt controller only has two DisplayPort connections, if you connect a LG 5K to one side of the MacBook Pro, then a second display must be connected to the other side of the MacBook Pro (there's one Thunderbolt controller per side of the MacBook Pro). One 5K or two 4K per side of the MacBook Pro can be connected.

The USB-C ports of the LG UltraFine 5K only support USB. They do not support DisplayPort because there is no other DisplayPort signal on the Thunderbolt cable that can be used and the display has no other DisplayPort inputs.

It might be possible to use a USB to DisplayPort converter (research devices that use DisplayLink, find examples at the DisplayLink or plugable websites) but they don't perform like real displays and may have issues in macOS.

• Answered by Joseph V from Fort Langley
• 11/09/2018
• Flag as inappropriate Answer (Can you daisy chain this from the LG UltraFine 5K Display?)

There aren't any buttons and screen will be black until you put in your usbc cable to the right port from a new MacBook Pro only. May be a MacBook. Remembering it is usb-c protocol not thunderbolt! So no thunderbolt2 to thunderbolt3 USBc option on this either!!

• Answered by David H
• 22/12/2016
• Flag as inappropriate Answer (power button lg 4 k monitor where is it)

Yes. I use two on my 2017 MacBook Pro 15inch. One in portrait and the other in landscape. You just need a different mount; the mount provided only does landscape so you will need to VESA mount the display.

• Answered by Michael C from Dunbar
• 1/09/2018
• Flag as inappropriate Answer (Can this be rotated into portrait?)

No, the 4K display does not have a built in camera or mike.

• Answered by James T from Woodstock
• 2/11/2016
• Flag as inappropriate Answer (Is the 4k display configured with a built-in camera?)

60 Hz.

You can use the LG UltraFine 4K Display with these Mac models:
4096 x 2304 @ 60Hz
MacBook (Retina, 12-inch, Early 2016)
MacBook Pro (15-inch, 2016)
MacBook Pro (13-inch, 2016, Four Thunderbolt 3 Ports)
MacBook Pro (13-inch, 2016, Two Thunderbolt 3 Ports)
4096 x 2304 @ 48Hz
MacBook (Retina, 12-inch, Early 2015)
A Mac with built-in USB-C or Thunderbolt 3 (USB-C) ports is required; the display isn't compatible with Mac models that use Thunderbolt 2.

See Apple Support for Use the LG UltraFine 4K Display with your MacBook or MacBook Pro for more information.

• Answered by Jay H from Middleton
• 7/04/2017
• Flag as inappropriate Answer (Refresh rate with a 2016 12 inch MacBook)