Supports High Bit Rate 2 (HBR2) at 5.4 Gbps per lane and HBR3 at 8.1 Gbps per lane.
A 3.3V open-drain signal allowing the GPU to detect panel presence and wake states.
ALPM works in tandem with PSR2. It provides a highly optimized protocol for transitioning the eDP Main Link lanes between active states and ultra-low-power sleep states. ALPM reduces the latency required to wake the interface back up, preventing visual stutter or lag when the user resumes interaction with the device. 3. Display Stream Compression (DSC)
Unlike external DisplayPort cables, which use standardized physical plugs, eDP implementations utilize fine-pitch micro-coaxial or flexible printed circuit (FPC) cables. edp 1.4 specification pdf
EDP 1.4 is a digital display interface standard that provides a high-bandwidth, low-power interface for connecting display panels to a host processor. It is designed to be a more efficient and cost-effective alternative to traditional display interfaces like VGA, DVI, and HDMI.
Among the various iterations of this standard, the represents one of the most significant evolutionary leaps in display interface history. It introduced foundational technologies—such as Panel Self-Refresh (PSR2) and Display Stream Compression (DSC)—that continue to define modern mobile computing.
When the screen image stops changing, the GPU tells the TCON to refresh the display locally from its own buffer. The GPU and the high-speed main data link then drop into a low-power sleep state, slashing system-wide power consumption. Supports High Bit Rate 2 (HBR2) at 5
Visit the VESA eDP Standard page for official announcements.
Older eDP versions often used separate PWM pins for backlight control. eDP 1.4 moves this entirely to the using standardized DPCD (DisplayPort Configuration Data) addresses. The specification PDF includes detailed tables for reading panel temperature, setting dynamic brightness, and controlling eDP MUXs for dual-panel or privacy mode displays.
This feature supports "Segmented Panel Display" architectures. It allows the high-bandwidth data to be split across multiple links, enabling ultra-high-resolution displays (like 4K and 8K) without requiring a massive, power-hungry single controller. It provides a highly optimized protocol for transitioning
The 1.4 standard supports up to four lanes of data transfer. With HBR2 rates of 5.4 Gbps per lane, it provides high data throughput. The later eDP 1.4a update introduced capability, making it possible to drive high-resolution panels without needing to increase the number of lanes, thus keeping the display connector small. 2. VESA Display Stream Compression (DSC)
: Scope, purpose, and compatibility with previous versions (eDP 1.3).
The represents a critical milestone in the evolution of display interface technology for mobile and integrated devices . Developed by the Video Electronics Standards Association (VESA), this standard was designed to meet the growing demand for higher resolutions, reduced power consumption, and sleeker device form factors.
For testing and compliance, documentation can be found in technical datasheets like this Keysight eDP 1.4 electrical performance PDF . Conclusion