DisplayPort Automotive Extension v1.1
As vehicles become smarter and more connected, the number of high-resolution, interior displays in automobiles is growing – delivering information critical for performance, efficiency, and vehicle safety.
Meet the Holy Grail of electronics safety integrity for road vehicles: the Video Electronics Standards Association’s (VESA) DisplayPort® Automotive Extension v1.1 (DP AE v1.1) specification — the first open industry standard for functional safety and security in automotive display systems.
DP AE v1.1 incorporates a fully executable, normative software emulator that enables silicon manufacturers, system integrators, and automotive OEMs to design and validate DisplayPort- and Embedded DisplayPort (eDP)-based devices to meet the internationally recognized gold standards for automotive safety (ISO 26262 ASIL-D) and security (UN R155, ISO 21434).
A New Model for Safety & Security in Automotive Displays
The centerpiece of the DP AE v1.1 update is a “white-box” C-model software emulator, designed for:
- Design engineers creating source (ECU), bridge (serializer/deserializer), and sink (receiver, timing controller) devices
- Test labs and CTS technicians preparing for formal compliance testing
- OEM validation teams verifying display system safety and authenticity.
The white-box model implements four normative safety and security profiles for real-world design, validation, and deployment of automotive display systems. These profiles add layered protection for main video data paths, auxiliary channels, and overall system integrity, enabling stakeholders to verify frame-level fidelity, detect tampering, and enforce cryptographic authentication in automotive display pipelines.
How DP AE Works
DP AE supports end-to-end CRC validation, secure AUX messaging, and SPDM-based device authentication.
The included C-Model emulator allows engineers to simulate, test, and verify DP-AE behavior virtually, accelerating compliance cycles and reducing risk. With backward compatibility and a flexible profile system, DP-AE enables scalable adoption across the automotive display ecosystem.
Featuring more than 500 tests for functional safety and security compliance, the new, fully executable Linux C-model allows silicon manufacturers to begin building and testing video source (GPU), bridge (e.g., serializer/deserializer) and sink (e.g., timing controller) devices for automotive displays based on the VESA DP AE specification. The DP AE standard supports compressed and uncompressed video as well as Multi-Stream Transport (MST) for up to 16 display regions of interest.
DP AE v1.1 Profiles
DP AE v1.1 includes four cumulative profiles:
- Profile 1: Mandatory functional safety via cyclical redundancy check (CRC) and frame counters generated on each video frame on the data path. This ensures that a frame never gets corrupted, dropped or repeated and that critical events are always captured and never missed. Additional video frame time-out monitoring ensures that both the source and sink maintain the data path link integrity.
- Profile 2: Scales up the functional safety coverage described above along with messaging, routing, and notifications to support more complex deployments and vendor-defined measurements.
- Profile 3: Continues to extend Profile 2 but adds advanced security to the auxiliary messages through secure channels established by device authentication. In addition, device certificate securely protects against counterfeits and unsafe after-market modifications.
- Profile 4: In addition to protecting the auxiliary messages in Profile 3, Profile 4 extends the security coverage to the data plane by adding integrity and anti-replay protection on the video frames.
These profiles support real-world implementations using the latest versions of DisplayPort (version 2.1a) and eDP (version 1.5a) without sacrificing bandwidth or requiring PHY changes. The DP AE standard supports compressed and uncompressed video as well as Multi-Stream Transport (MST) for up to 16 display regions of interest.
Background
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 use DisplayPort or eDP to carry video data from the central vehicle computer, or ECU, to the displays. In addition to its high video bandwidth capability, DisplayPort features MST, which enables multiple displays to be connected to a single DP source port. However, until the introduction of VESA’s DP AE standard, there was no standardized way to verify that the data transmitted from the ECU was received by the display in the same way that it was sent, ensuring it is free of noise injection errors and has not been the target of malicious tampering.
Technical Specifications
VESA’s DP AE standard adds critical safety and security protocols on top of the existing DisplayPort 2.1a and eDP 1.5a spec. It features:
- Mandatory FuSa 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.
- Advanced profiles that extend safety coverage to the DisplayPort AUX channel as well as security protection to both the DisplayPort AUX Channel and main data path.
- For security, end-to-end protection is supported using the standard DMTF SPDM protocol to establish a secure channel between the devices. Protection of the main data path is established using NIST compliant AES-GMAC on the frame as well as AES-GCM protection of the messages on the control plane.
- The C-model emulator is available as a Linux application and can be integrated into software testing environments. A Windows-based graphical interface is under development to support automotive technicians in manufacturing and validation roles.
