The specification allows the display link to dynamically alter its frame rate to match the native frame rate of the media content (e.g., dropping to 24Hz or 48Hz for cinematic movie playback). This prevents judder and eliminates the power wasted by artificial frame-rate padding. Architectural Components of an eDP 1.4 Link
eDP 1.4 offers distinct physical advantages over the legacy LVDS (Low-Voltage Differential Signaling) standard it replaced.
Pulse-Width Modulation (PWM) signals or digital commands via the AUX channel to control display brightness. Technical Specification Summary Table Specification Details Standard Body VESA (Video Electronics Standards Association) Max Lanes 1, 2, or 4 lanes Max Lane Speed 5.4 Gbps (HBR2) Total Max Bandwidth 21.6 Gbps (4-lane configuration) Encoding Scheme 8b/10b encoding Primary Power Saving Panel Self-Refresh 2 (PSR2) with Partial Update Compression Support VESA DSC v1.1 (Visually Lossless) Interface Protocol Packet-based architecture derived from DisplayPort Finding Official Specifications edp 1.4 specification pdf
In mobile devices, the display subsystem is often the largest consumer of battery power. eDP 1.4 addresses this with , an optimization of the original PSR protocol found in eDP 1.3. How PSR2 Works
Panel Self Refresh (PSR) allows the display panel to refresh its own frame from its own local memory when the computer is displaying a static image (e.g., reading a document). The specification allows the display link to dynamically
The Definitive Guide to the eDP 1.4 Specification: Architecture, Features, and Implementation
This effective payload easily accommodates the following uncompressed visual profiles at standard 24-bit color depth (8 bits per channel): Resolution Name Pixel Dimensions Refresh Rate Required Bandwidth 60 Hz / 120 Hz Low / Medium QHD / WQHD 60 Hz / 144 Hz Medium / High 4K Ultra HD High (Utilizes max 4-lane HBR2) 4. Multi-SST Operation (MSO) Pulse-Width Modulation (PWM) signals or digital commands via
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eDP 1.4 includes explicit support for dynamically changing the display's refresh rate. This capability serves two primary purposes:
Physically, the eDP 1.4 interface is highly streamlined. It relies on three primary signal groups to manage communication between the source (GPU) and the sink (Display Panel TCON):
