DisplayPort Extension via Decoupled Link Training

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Solution Overview

Problem

DisplayPort communication is limited by transmission distance and media requirements, preventing effective communication between source and sink devices beyond specified cable lengths and not allowing manipulation of video or audio content.

Innovation Solution

The system employs upstream and downstream facing port devices connected via an extension medium, conducting link training using different DisplayPort configuration data to extract and transmit video data, allowing communication beyond traditional limits by using an extension medium and maintaining link integrity through emulation and processing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of stationary object

If DisplayPort communication uses direct connection between source and sink devices, then link integrity is maintained, but communication is limited to three meters cable length

Engineering Contradiction:

Improvecable lengthVSAvoidlink integrity

Core Design Contradiction:

Length of stationary objectVSReliability

Solution Approach 1:

The system segments the DisplayPort communication path into two separate links: one between the source device and extension device, and another between the extension device and sink device. Each link is independently trained and managed, allowing the overall communication distance to exceed the traditional three-meter limit while maintaining link integrity through proper segmentation of the communication path.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

An extension device acts as an intermediary between the DisplayPort source and sink devices. This intermediary performs link training with both the source and sink, extracts video data from incoming DisplayPort data, and regenerates DisplayPort data for transmission to the sink, thereby enabling extended communication distances while maintaining signal integrity.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If DisplayPort communication allows manipulation of video content, then content adaptability is improved, but compliance with DisplayPort specification is compromised

Engineering Contradiction:

Improvecontent manipulation capabilityVSAvoidspecification compliance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The extension device extracts video data from the incoming DisplayPort data stream, separates it from the encapsulated DisplayPort format, and then regenerates new DisplayPort data containing the extracted video data. This extraction and regeneration process enables content manipulation while maintaining compliance with the DisplayPort specification by ensuring the outgoing data follows proper DisplayPort formatting.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS11812193B2Decoupling link training for a video source and video sink in an extension environment

Publication Date: 2023.11.07 ICRON TECH

AI summary

In some embodiments, a system for providing DisplayPort communication over an extension medium is provided. The system comprises an upstream facing port device (UFP device) and a downstream facing port device (DFP device). The UFP device is configured to conduct link training with a DisplayPort source device using first DisplayPort configuration data (DPCD). The DFP device is configured to conduct link training with the DisplayPort sink device using second DPCD different from the first DPCD. The UFP device is configured to extract video data from DisplayPort data received from the DisplayPort source device and transmit the video data to the DFP device. The DFP device is configured to receive the video data, generate DisplayPort data as specified by the second DPCD, and transmit the generated DisplayPort data to the DisplayPort sink device as specified by the second DPCD.