Standard · Interfaces & SerDes
DisplayPort
A VESA packet-based display interface using micro-packets over one to four lanes, with link rates from 1.62 to 20 Gbps per lane and support for multi-stream transport and display stream compression.
- Also known as
- DP, DisplayPort 2.1
- Type
- Standard
- Domain
- Interfaces & SerDes, Display and imaging interface
Notes
Its packetised architecture is what allows DisplayPort to be tunnelled inside USB4 and Thunderbolt.
Overview
DisplayPort is a digital audio and video interface standard from VESA (the Video Electronics Standards Association) for connecting computers and other sources to monitors, TVs and internal display panels. It sends video and audio as small data packets over one to four high-speed lanes, alongside an auxiliary channel for control. It also runs inside laptops as Embedded DisplayPort and over USB Type-C connectors in DisplayPort Alt Mode.
How it works
A DisplayPort link consists of one, two or four main lanes, each a differential pair carrying data in one direction from source to sink, plus a bidirectional auxiliary channel that carries additional data such as the display's identification. Source and sink negotiate a link rate when connected, dropping to a slower mode if the cable cannot sustain a faster one. Rather than dedicating wires to pixel clocks, DisplayPort uses a micro-packet architecture: video, audio and other data are packed into the lanes, and the receiver recovers timing from the data itself.
Link rates have risen with each version, from 1.62 Gb/s per lane in the original standard. DisplayPort 1.2 reached 5.4 Gb/s per lane and DisplayPort 1.4a 8.1 Gb/s per lane, both with 8b/10b coding, giving a maximum payload of 25.92 Gb/s over four lanes for 1.4a. DisplayPort 2.0 introduced ultra-high bit rates of up to 20 Gb/s per lane and more efficient 128b/132b coding, for a maximum payload of 77.37 Gb/s, and the current DisplayPort 2.1 aligns the physical layer with USB4 so one PHY can serve both.
Several features ride on this base. Multi-stream transport lets one port drive several displays through a hub or a daisy chain. Display Stream Compression, mandatory to support in DisplayPort 2.1, reduces bandwidth with visually lossless compression. Over USB Type-C, DisplayPort Alt Mode can share the connector's lanes with USB data. VESA runs compliance programmes and certifies cables, such as DP40 and DP80 for the higher link rates.
Examples
- A graphics card driving a high-refresh 4K monitor over DisplayPort 2.1 with a certified DP80 cable.
- A laptop sending video to an external monitor through its USB Type-C port in DisplayPort Alt Mode.
- A docking station using multi-stream transport to drive two monitors from one DisplayPort source.
- A laptop's internal panel connected to the processor over Embedded DisplayPort to save cabling and power.
Why it matters
Almost every PC, graphics card and many monitors include DisplayPort, so display controller designers, SerDes and PHY teams, board designers and compliance engineers all work with it. Its link rates set SerDes requirements, and passing VESA compliance testing is needed to use the DisplayPort logos.
In the chip lifecycle, supported versions and link rates are chosen at architecture for GPUs, SoCs and monitor controllers, the PHY and link layer are designed and verified to the VESA specification, and link training and compliance are tested after first silicon and before product certification.
It matters most to: Display and Multimedia Driver Engineer, Display Applications Engineer, Display Subsystem Architect, Interface PHY Design Engineer (SerDes), SerDes and High-Speed I/O Validation Engineer
Common confusions
- Not the same as HDMI
- HDMI is a separate display interface, more common on TVs and consumer electronics. DisplayPort sources marked DP++ can output HDMI signals through a passive adaptor, but the two standards are developed by different organisations.
- Not the same as USB-C
- USB Type-C is a connector. A USB-C port carries DisplayPort only if the device supports DisplayPort Alt Mode or tunnelling over USB4.
- Not the same as Thunderbolt
- Thunderbolt is a separate interface that can tunnel DisplayPort video alongside other data; DisplayPort 2.0 adopted a physical layer based on Thunderbolt 3.
Related standards
- VESA DisplayPort 2.1 (current DisplayPort audio and video interface specification)
Sources
- VESA Releases DisplayPort 2.1 Specification (17 October 2022) (opens in a new tab), VESA, 2026-10-22
- VESA Publishes DisplayPort 2.0 Video Standard Enabling Support for Beyond-8K Resolutions, Higher Refresh Rates for 4K/HDR and Virtual Reality Applications (press release, 26 June 2019) (opens in a new tab), VESA, 2026-10-22
- Why DisplayPort (opens in a new tab), VESA, 2026-10-22
- VESA to Update DisplayPort 2.1 with New Active Cable Specification for Up to 3X Longer DP80 Cables (press release, 6 January 2025) (opens in a new tab), VESA, 2026-10-22
- DisplayPort (Wikipedia) (opens in a new tab), Wikimedia Foundation, 2026-10-22
Related terms
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