LG's New UltraFine 5K Display Limited to 4K Resolution When Used With 2018 iPad Pro
LG yesterday released a new version of its UltraFine 5K Display with USB-C connectivity, allowing it to be used with 2018 iPad Pro models, but Apple has since confirmed that the iPad Pro cannot take advantage of the full 5K resolution.

In a new support document, Apple says the UltraFine 5K is limited to a 4K resolution of 3,840×2,160 at 60Hz when connected to 2018 iPad Pro models via USB-C. The full 5K resolution requires a 2016 or newer MacBook Pro, a 2018 or newer MacBook Air, a 2017 or newer iMac or iMac Pro, or a 2018 Mac mini.
The new UltraFine 5K Display is available to order for $1,299.95 on Apple.com. Like the previous model, it also supports Thunderbolt 3, with up to 94W of power for pass-through charging of any Mac or iPad connected to the display.
The new display has the model number 27MD5KL-B.
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Top Rated Comments
The monitor is not a beauty, though.
https://www.displayport.org/displayport-over-usb-c/
DisplayPort leverages the Alternate Mode Functional Extension of the USB Type-C interface, and shares similar electrical characteristics with USB 3.1, allowing use of common system elements.
* Video, SuperSpeed USB and power, all on one connector
* 4K @60Hz 24-bit color (without compression) with simultaneous USB 3.1
* 5K (5120 x 2880) display support without compression with simultaneous USB 2.0
* Support for BT.2020 color space, HDR, and HDCP 2.2
* 8K x 4K display support with use of 4:2:0 pixel structure (good) or VESA Display Stream Compression (better)
* High-end multichannel audio support
* Backward compatible with VGA, DVI, and HDMI 2.0 with CEC using plug adapters or adapter cables
* Extensible packet-based data structure
It's just that the 2018 iPad Pro models or the 12" MacBooks can't do it.
However, simultaneous 5K video plus USB support over USB-C is limited to USB 2.0. To get simultaneous 5K + USB 3, you need to use Thunderbolt.
The previous 5K display is Thunderbolt 3 only. It didn't work at all with the iPad Pro. The previous 4K display is USB-C. The new 5K display accepts both Thunderbolt 3 and USB-C inputs.