The Video Electronics Standards Association (VESA) has recently released the updated DisplayPort 2.1a specification, alongside the Automotive Extension Services protocol. DisplayPort 2.1a introduces an enhancement to the previous cable standards, replacing the DP40 ultra-high-bit-rate (UHBR) cable specification with the DP54 UHBR cable specification. This change facilitates support for up to four-lane UHBR13.5 link rates, enabling a maximum throughput of 54 Gbps over a two-meter passive cable. The update significantly increases the passive cable length capability for UHBR13.5 GPU-to-display connections, which were previously limited to shorter lengths with the DP80 UHBR cable.
Source: VESA
Furthermore, VESA has published a new Automotive Extension Services protocol specification applicable to both DisplayPort 2.1a and the most recent version of its Embedded DisplayPort (eDP) specification, version 1.5a. This protocol extension is designed to enhance automotive display functionality, focusing on safety, security, integrity, and authentication. It supports up to 16 display regions of interest and aims to meet the ISO 26262 ASIL-D standard, a benchmark in electronic safety integrity. This standardization marks a significant step for VESA in automotive display technologies. Chipset manufacturers have already begun incorporating the VESA Automotive Extension Services protocol into their future vehicle designs.
Longer UHBR Cables for Greater Flexibility
With the DisplayPort 2.1a update, the new DP54 cable specification enables support of both UHBR10 and UHBR13.5 sink and source devices with passive cable lengths of up to two meters. Monitors enabled with UHBR13.5 can drive resolution/refresh rate combinations as high as 8K2K at 240 Hz or 8K4K at 120 Hz over four lanes. While VESA is eliminating the DP40 cable spec, existing DP40 cables that have been shipped to date have been confirmed by VESA through rigorous testing to be compliant with the DP54 cable spec and support UHBR13.5 link rates. Sink and source devices supporting UHBR20 link rates (a maximum throughput of 80 Gbps using all four lanes) continue to be supported by VESA certified DP80 UHBR cables.
"With the latest update to DisplayPort, the UHBR13.5 cable spec is now purpose built to provide both UHBR10 and UHBR13.5 monitors and graphics cards with a longer passive cable. Consumers are no longer limited to connecting UHBR13.5 sink and source devices with a one-meter DP80 cable, which provides more bandwidth support than what their hardware needs and, in some cases, might be too short for their set-up, for example with ultra-wide curved displays," stated James Choate, compliance program manager for VESA.
Making the De Facto Standard for Vehicle Displays Even Better
As vehicles become more advanced and connected, the number of high-resolution interior displays in automobiles is on the rise. These displays provide a wide variety of critical information that drivers need to operate their vehicles safely and efficiently. Most automotive displays currently use DisplayPort or eDP to carry video data from the central vehicle computer to the displays. In addition to its high video bandwidth capability, DisplayPort features Multi-Stream Transport (MST), which enables multiple displays to be connected to a single DP source port. However, until now, there was no standardized way to verify that the data transmitted from the GPU was received by the display in the same way that it was sent, ensuring it is free of noise injection or errors.
VESA's new Automotive Extension specification protocol addresses this need, adding critical safety and security protocols on top of the existing DisplayPort 2.1a and eDP 1.5a spec. It features a mandatory functional safety profile for the main data path and metadata that uses very-high-safety-rated cyclical redundancy check (CRC) polynomial mathematical signatures for every frame of video data across the data path. This ensures that a frame never gets dropped or repeated so that critical events are always captured and never missed.
The protocol also features more advanced optional profiles that provide functional safety for the DisplayPort Aux channel, which carries command and control data for the video source device; security authentication and integrity checking on the data path, to prevent unauthorized tampering with the video data or the physical displays themselves; and encryption of the DisplayPort Aux channel, to prevent hackers from reading information on the types of displays in the vehicles that could be used to tamper with the displays.
"Displays are increasingly being integrated into automobiles, which provides a valuable infotainment resource for drivers and passengers but can also create opportunities for safety errors and data breaches if not properly secured," stated Bill Lempesis, executive director of VESA. "As the world's leading standards body for the global display industry, VESA takes automotive display safety and security seriously. Leveraging the latest versions of DisplayPort and eDP with VESA's Display Stream Compression (DSC) codec, our new Automotive Extension Services protocol can handle the safety and security needs of virtually every safety-critical display in the vehicle from a single cable. We are issuing a call to electronics, displays and automotive manufacturers to join our efforts in continuing to shape this new Automotive Extension Services protocol to address the future challenges and needs facing the automotive industry and consumers."
The VESA Automotive Extension Working Group, which is driving the new Automotive Extension specification protocol, is open to all VESA members. For companies that are not currently members but would like to participate, please visit https://vesa.org/join-vesamemberships/ and complete the application form to become a member.
"With the latest update to DisplayPort, the UHBR13.5 cable spec is now purpose built to provide both UHBR10 and UHBR13.5 monitors and graphics cards with a longer passive cable. Consumers are no longer limited to connecting UHBR13.5 sink and source devices with a one-meter DP80 cable, which provides more bandwidth support than what their hardware needs and, in some cases, might be too short for their set-up, for example with ultra-wide curved displays," stated James Choate, compliance program manager for VESA.
Making the De Facto Standard for Vehicle Displays Even Better
As vehicles become more advanced and connected, the number of high-resolution interior displays in automobiles is on the rise. These displays provide a wide variety of critical information that drivers need to operate their vehicles safely and efficiently. Most automotive displays currently use DisplayPort or eDP to carry video data from the central vehicle computer to the displays. In addition to its high video bandwidth capability, DisplayPort features Multi-Stream Transport (MST), which enables multiple displays to be connected to a single DP source port. However, until now, there was no standardized way to verify that the data transmitted from the GPU was received by the display in the same way that it was sent, ensuring it is free of noise injection or errors.
VESA's new Automotive Extension specification protocol addresses this need, adding critical safety and security protocols on top of the existing DisplayPort 2.1a and eDP 1.5a spec. It features a mandatory functional safety profile for the main data path and metadata that uses very-high-safety-rated cyclical redundancy check (CRC) polynomial mathematical signatures for every frame of video data across the data path. This ensures that a frame never gets dropped or repeated so that critical events are always captured and never missed.
The protocol also features more advanced optional profiles that provide functional safety for the DisplayPort Aux channel, which carries command and control data for the video source device; security authentication and integrity checking on the data path, to prevent unauthorized tampering with the video data or the physical displays themselves; and encryption of the DisplayPort Aux channel, to prevent hackers from reading information on the types of displays in the vehicles that could be used to tamper with the displays.
"Displays are increasingly being integrated into automobiles, which provides a valuable infotainment resource for drivers and passengers but can also create opportunities for safety errors and data breaches if not properly secured," stated Bill Lempesis, executive director of VESA. "As the world's leading standards body for the global display industry, VESA takes automotive display safety and security seriously. Leveraging the latest versions of DisplayPort and eDP with VESA's Display Stream Compression (DSC) codec, our new Automotive Extension Services protocol can handle the safety and security needs of virtually every safety-critical display in the vehicle from a single cable. We are issuing a call to electronics, displays and automotive manufacturers to join our efforts in continuing to shape this new Automotive Extension Services protocol to address the future challenges and needs facing the automotive industry and consumers."
The VESA Automotive Extension Working Group, which is driving the new Automotive Extension specification protocol, is open to all VESA members. For companies that are not currently members but would like to participate, please visit https://vesa.org/join-vesamemberships/ and complete the application form to become a member.
