HDMI Connector Shield Pin Redesign for Crosstalk Reduction
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Solution Overview
Problem
The HDMI standard's maximum transmission speed of 10.2 Gbps is insufficient for high-quality 3D and 4k2k video signals, and expanding it to higher speeds like 15 Gbps or 20 Gbps while maintaining compatibility and signal quality is challenging due to the deterioration of differential pair coupling and increased crosstalk in current connectors.
Innovation Solution
A connector design with signal electrode pins arranged within a cuboid dielectric and coupled with a square-tube grounding conductor, where each pin is arrayed near the grounding conductor to transmit differential signals with single end, and a ground plane is disposed between stages to reduce crosstalk, ensuring high-quality signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of data pairs is increased by assigning shield pins as data pins, then transmission bandwidth is expanded, but differential pair coupling deteriorates and crosstalk increases
Solution Approach 1:
A ground plane is introduced as an intermediary between signal electrode pins to provide electromagnetic shielding and reduce crosstalk. The ground plane acts as a mediator that separates adjacent differential pairs and prevents interference, enabling higher data pair counts while maintaining signal quality
Solution Approach 2:
The connector structure implements local quality by positioning ground plane segments specifically between adjacent differential pairs. This localized grounding approach provides targeted electromagnetic shielding where crosstalk occurs most, rather than uniform shielding throughout the entire connector structure
2Reliability
If signal electrode pins are arranged closer to the grounding conductor, then coupling is improved, but space for additional data pairs is reduced
Solution Approach 1:
The connector utilizes three-dimensional space by arranging signal electrode pins at multiple positions relative to the ground plane - some pins are positioned closer to the ground plane for strong coupling, while others are positioned further away. This vertical dimension arrangement allows optimization of coupling for different pins without limiting the total number of data pairs
3Adaptability or versatility
If the connector structure is kept the same as current HDMI, then compatibility is maintained, but transmission speed is limited to 10.2 Gbps
Solution Approach 1:
The connector design achieves universality by making shield pins multi-functional - they can serve as data pins when higher bandwidth is needed, or be grounded for compatibility with existing HDMI standards. This allows the same connector structure to support both legacy 10.2 Gbps transmissions and newer higher-speed transmissions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for high-quality signal transmission at higher speeds without compromising compatibility, reducing crosstalk, and maintaining signal integrity even without corresponding shielding pins, enabling the transmission of higher bandwidth signals like 15 Gbps and beyond.
Implementation Method 1
each of the signal electrode pins is arrayed near the grounding conductor so as to couple with the grounding conductor... electromagnetic field of signals being propagated is distributed between each of the signal electrode pins and the grounding conductor
Data Source
AI summary
To provide a connector enabling high quality signal transmission while maintaining compatibility with the current HDMI connector, in a new HDMI interface using pins assigned to a shield, as a data pair. Each of signal electrode pins is arrayed near a shell (grounding conductor) so as to couple with the shell, and differential signals are transmitted with single end. A ground plane is disposed between multiple signal electrode pins of a first stage and the plurality of signal electrode pins of a second stage within a dielectric. Also, connection conductors electrically connecting the ground plane and the grounding conductor are disposed between each of the signal electrode pins of each of the stages within the dielectric. With a pair of signal electrode pins transmitting differential signals, crosstalk from other signal electrode pins can be reduced, and high quality signal transmission is enabled.