HDMI

HDMI (High-Definition Multimedia Interface) is a proprietary digital interface for transmitting uncompressed video and compressed or uncompressed audio over a single cable. It was created by a group of consumer electronics companies to replace older analog standards and the video-only DVI connector, combining picture, sound, and device-control signals in one connection. The first specification, HDMI 1.0, was finalized in December 2002, and the first products reached the market in 2003.

HDMI became the standard display and audio connector on televisions, monitors, games consoles, and personal computers. In virtual reality it had a specific role: the first generation of tethered PC VR headsets, including the Oculus Rift CV1 (2016) and the original HTC Vive (2016), used an HDMI cable to carry the image from the host computer to the headset. Later high-resolution headsets moved to DisplayPort for its higher refresh-rate capacity, but HDMI remains relevant to VR through media playback, mixed-reality capture, and passthrough setups.

Origin and governance

HDMI was developed by seven founding companies: Hitachi, Panasonic (then Matsushita), Philips, Silicon Image, Sony, Thomson, and Toshiba. Work on HDMI 1.0 began in 2002, and the final 1.0 specification was released in December 2002, designed to be backward compatible with the DVI interface already used on computers while adding audio, a smaller connector, and consumer-electronics control.

The standard is not an open specification. Manufacturers must be licensed to implement it. For versions through 1.4b the specification was managed by HDMI Licensing, LLC (later HDMI Licensing Administrator, Inc., or HDMI LA), the body that also handles compliance testing and trademark licensing. The HDMI Forum, a separate non-profit organization, was established on 25 October 2011 and has developed the specification from version 2.0 onward. By January 2021 roughly 10 billion HDMI-enabled devices had been sold.

How it works

For most of its history HDMI carried video using Transition-Minimized Differential Signaling (TMDS), the same physical signaling inherited from DVI. TMDS sends data over three differential channels plus a separate clock channel, interleaving three kinds of information: a video data period, a data island period (which carries audio and auxiliary packets), and a control period. Video pixels are sent with 8b/10b encoding, which gives an effective payload of about 80 percent of the raw line rate.

HDMI 2.1 introduced a new signaling scheme, Fixed Rate Link (FRL), that replaces TMDS at the highest data rates. FRL uses more efficient 16b/18b encoding (about 88.8 percent efficiency) and was needed to reach the 48 Gbit/s total bandwidth of HDMI 2.1, up from the 18 Gbit/s of HDMI 2.0. HDMI 2.1 and later can also use Display Stream Compression (DSC), a VESA-defined visually lossless compression, to fit very high resolutions and refresh rates within the available bandwidth.

Protected commercial content is encrypted over HDMI using High-bandwidth Digital Content Protection (HDCP), a copy-protection system originally created by Intel. HDCP authentication between the source and the display can affect VR setups, because intermediate devices such as capture cards or splitters must also be HDCP compliant for protected streams to pass.

Connector types

Type	Common name	Pins	Typical use
A	Standard	19	Televisions, monitors, desktop graphics cards, games consoles
C	Mini	19	Cameras, some tablets and laptops
D	Micro	19	Smartphones, small cameras, compact devices

Type B was defined in early specifications for a dual-link variant but was never used in shipping consumer products. Type E is a locking connector for automotive use.

Version history

Each HDMI version raised the available bandwidth and added features. The figures below give the maximum total signaling rate and the headline capabilities of each release.

Version	Release date	Max total bandwidth	Notable additions
1.0	December 2002	4.95 Gbit/s	Combined audio and video over DVI-based signaling; 1080p; up to 8 audio channels
1.1	May 2004	4.95 Gbit/s	DVD-Audio support
1.2	August 2005	4.95 Gbit/s	One Bit Audio (SACD); PC source support
1.3	June 2006	10.2 Gbit/s	Deep Color, xvYCC wide gamut, higher clock; Type C (Mini) connector
1.4	June 2009	10.2 Gbit/s	4K at 30 Hz, stereoscopic 3D formats, HDMI Ethernet Channel, Audio Return Channel (ARC), Type D (Micro) connector
2.0	September 2013	18 Gbit/s	4K at 60 Hz, up to 32 audio channels
2.0a	April 2015	18 Gbit/s	Static HDR metadata (HDR10)
2.0b	March 2016	18 Gbit/s	Hybrid Log-Gamma (HLG) HDR
2.1	November 2017	48 Gbit/s	8K at 60 Hz, 4K at 120 Hz, VRR, eARC, ALLM, QMS, QFT, FRL signaling
2.2	June 2025	96 Gbit/s	4K at 240 Hz and 8K at 60 Hz uncompressed; up to 12K and 16K with DSC; Latency Indication Protocol; Ultra96 cable

HDMI 1.4 was the first version to define standardized stereoscopic 3D transport. HDMI 1.4a made support for several 3D formats mandatory, including Frame Packing at 720p or 1080p24, Side-by-Side, and Top-and-Bottom; Frame Packing transmits the full-resolution left and right images stacked vertically with a blanking gap, and it became the default output format of Blu-ray 3D players.

HDMI 2.1 added several features aimed at low-latency and interactive use. Variable Refresh Rate (VRR) lets the display update in step with the source to reduce tearing and stutter, Auto Low Latency Mode (ALLM) switches a display into its low-latency mode automatically, and Quick Frame Transport (QFT) reduces latency by sending each frame faster. HDMI's own announcement describes QFT as reducing latency for "smoother no-lag gaming, and real-time interactive virtual reality."

HDMI 2.2 was announced at CES on 6 January 2025 and released by the HDMI Forum on 25 June 2025. It doubles the maximum bandwidth to 96 Gbit/s and introduces a new Ultra96 cable, the only cable rated for the full bandwidth of the specification. It supports uncompressed 4K at 240 Hz and 8K at 60 Hz with full 4:4:4 chroma at 10-bit and 12-bit color, and resolutions up to 12K at 120 Hz and 16K at 60 Hz with compression. It also adds a Latency Indication Protocol (LIP) to improve audio and video synchronization in multi-device chains such as those that include an AV receiver or soundbar. HDMI 2.2 is backward compatible with earlier versions.

Role in virtual and augmented reality

HDMI was the display interface of the first wave of consumer tethered PC VR. The Oculus Rift CV1, released on 28 March 2016, connected to the host PC with an HDMI cable for video and a USB cable for data and power; its recommended specifications called for a graphics card with a compatible HDMI 1.3 output. The original HTC Vive, also released in 2016, routed its connection through a link box that took HDMI and USB from the PC and a power input; the box also included a Mini DisplayPort as an alternative for systems without a spare HDMI port.

Sony's PlayStation VR, released in October 2016, used a separate processor unit that sat between the PlayStation 4 and the television. The processor unit took the console's HDMI output and could pass the image through to the TV (HDMI passthrough) while also driving the headset, so the same signal fed both displays. The original Vive link box, by contrast, had no such passthrough.

As headset displays grew in resolution and refresh rate, manufacturers moved from HDMI to DisplayPort, which offered more bandwidth in the same era and supports packetized multi-stream transport. The HTC Vive Pro (2018) redesigned its link box to use DisplayPort and dropped HDMI, and the HTC Vive Cosmos and Oculus Rift S likewise used DisplayPort. The Valve Index requires a DisplayPort connection and does not work through an adapted HDMI output, because its 1440x1600-per-eye panels running at up to 144 Hz exceed what its supported HDMI generation could carry.

The shift reflects the bandwidth demands of VR. A headset renders two views at once and benefits from high refresh rates (90 Hz and above) to reduce motion sickness, so the per-eye pixel-rate of a VR display is high relative to a single flat monitor. DisplayPort reached the bandwidth needed for those panels earlier in the relevant product cycle, while standalone headsets such as the Meta Quest series removed the video cable entirely by rendering on-device, using a USB-C cable (with Quest Link) or Wi-Fi (with Air Link) only to stream PC content when desired.

HDMI continues to appear around VR and AR in supporting roles. Mixed-reality capture rigs and livestream setups route a headset's or PC's output through HDMI capture cards; many AR development kits, single-board computers, and media players used to prototype or drive head-up and spatial displays expose HDMI outputs; and HDMI remains the dominant interface for the televisions and monitors used to spectate VR play. The interactive features added in HDMI 2.1, in particular VRR and ALLM, are aimed at the same low-latency goals that matter in head-mounted use.

Current status

As of 2026 HDMI 2.1 is the prevailing high-bandwidth version on televisions, monitors, games consoles, and graphics cards, while HDMI 2.2 and its Ultra96 cable are early in adoption following the specification's June 2025 release. HDMI and DisplayPort coexist as the two main wired display interfaces; DisplayPort remains the typical choice for tethered PC VR headsets, while HDMI dominates living-room and console use and the displays used to view VR and AR content.