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eDP 1.4 advances this with PSR2, allowing selective frame updates. If only a small portion of the screen changes (like a blinking cursor), the GPU only transmits the updated pixels instead of waking up the entire interface link to send a whole new frame. 2. High Bit Rate 3 (HBR3) Support
A single-ended 3.3V signal line that acts as an interrupt mechanism. The display panel asserts HPD to notify the host GPU that it is powered on, connected, and ready for link training or AUX communication. 4. Power Management and Efficiency Metrics
Because VESA specifications are highly technical intellectual property, the official, authoritative document is strictly maintained by VESA.
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The eDP 1.4 standard introduced several revolutionary features that optimized the communication between the graphics processor (GPU) and the internal display panel.
eDP 1.4 integrates VESA’s Display Stream Compression (DSC) standard, a visually lossless, low-latency compression algorithm.
The EDP 1.4 specification introduces several key features that enhance display performance and user experience: High Bit Rate 3 (HBR3) Support A single-ended 3
eDP 1.5 retains all the key features of eDP 1.4b while introducing new protocols for even greater power savings and improved motion image quality. Its major enhancements include:
Because VESA specifications are intellectual property, the full is generally not available for free public download on the open web.
HBR3 delivers up to 8.1 Gigabits per second (Gbps) per lane. ALPM) EMI Profile High radiation
The industry standardized two primary pinout configurations for eDP 1.4 modules to ensure interoperability between TCON vendors and system integrators: 30-Pin eDP Connector
A single-ended signal wire that serves as an interrupt line. The panel pulls this signal high or low to notify the GPU of its presence or to request an AUX channel link configuration check. Engineering Impact: eDP vs. Legacy Standards Legacy LVDS Wire/Pin Count High (often 20-30+ pins) Low (as few as 2 to 8 signal lines) Max Bandwidth Limited (struggles above 1080p) Extremely High (up to 32.4 Gbps) Power Management Always-on continuous driving Dynamic (PSR, PSR2, ALPM) EMI Profile High radiation, requires shielding Low EMI due to low-voltage differential signaling Form Factor Bulky connectors and thick cables Ultra-thin micro-coaxial ribbon cables Practical Use Cases
: Enhanced support for regional dimming and backlight modulation via the eDP AUX channel. Document Architecture