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DisplayPort Alt Mode 2.0 will let laptops connect to 16K displays over USB-C in 2021

Next year will see the introduction of laptops and desktops that should be able to connect to massive 16K displays running HDR across USB-C, thanks to a new DisplayPort Alt Mode 2.0 standard released by the Video Electronics Standards Association (VESA) on April 29.

The new standard takes the DisplayPort 2.0 standard launched last year and eliminates the need for a dedicated DisplayPort connector. Instead, it allows the same protocols to run over USB-C, the interface increasingly common among laptops, giving them a massive boost in I/O bandwidth for displays and other external devices. 

The new specification will allow for supported laptops to connect up to three 4K (3840×2160) displays, each running at 90Hz, and with 30 bpp (bits per pixel) 4:4:4 HDR (no compression). The spec will also allow you to connect a single 10K (10240×4320) 60Hz display without HDR, or a single 16K (15360×8640) display with 30 bpp HDR, though the latter capability requires compression. Our earlier story has more detail.

The enabling technology is what VESA calls DisplayPort Alternate Mode 2.0. While using DisplayPort Alt Mode 2.0, the USB-C connector can transmit up to 80Gbps of DisplayPort video data utilizing all four high-speed lanes in the cable, or up to 40Gbps while using the other lanes for USB data delivery to storage devices and other peripherals. (The real-world throughput is more like 77Gbps after encoding is factored in.)

Put another way, common DisplayPort 1.4 devices, using DisplayPort cables, can transmit 4 channels of data at 8.1Gbps apiece. DisplayPort 2.0 via USB-C (Alt Mode) ups that to four channels of 20Gbps apiece. Finally, DSC 1.2a, the same advanced compression protocol used in DisplayPort 1.4a, can be used to double that bandwidth yet again.

While DisplayPort’s new Alt Mode spec will run over the same USB-C connection as your laptop may have already, changes under the hood will mean that you’ll need to take some care when buying and configuring hardware. For one thing, USB-C devices connected to your laptop communicate among themselves, so any devices attached to a USB-C hub have to share the available bandwidth. Fortunately, there’s enough available bandwidth that this won’t matter, unless you’re also connecting to multiple, high-resolution monitors.

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