HDMI Connector Multi-Column Pad Layout Reduces Crosstalk
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Solution Overview
Problem
Existing HDMI connectors face limitations in supporting higher data rates due to crosstalk between channels, which restricts the transmission of high-definition content such as 4k resolution, and existing solutions like compressing content lead to performance issues.
Innovation Solution
The HDMI connector design arranges pins in at least two columns of contact points on a printed circuit board, increasing the distance between pins of different channels, thereby reducing crosstalk, and maintains backwards compatibility with HDMI specification v1.4 by using a plurality of conductive paths for differential data and clock channels with dedicated grounds, providing shielding between channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If pins are arranged in a single column to maintain compact connector design, then device complexity is reduced, but crosstalk between different channels increases
Solution Approach 1:
The patent transitions from a single-column pin arrangement to a multi-column pad layout, utilizing spatial dimensionality to separate channels. By arranging pads in multiple columns with increased inter-column spacing, the design reduces electromagnetic coupling between adjacent channels while maintaining a compact overall connector footprint, thus reducing crosstalk without significantly increasing structural complexity.
Solution Approach 2:
The patent segments the pad arrangement into distinct columns, with each column potentially housing pads for different channels. This segmentation creates physical separation between channels through increased column spacing, effectively isolating electromagnetic fields and reducing crosstalk between adjacent differential pairs while maintaining organized signal routing.
2Adaptability or versatility
If content is compressed to meet lower data rates, then compatibility with existing connectors is maintained, but content quality and performance deteriorate
Solution Approach 1:
The patent changes the physical parameters of the connector, specifically the pad spacing and column arrangement, to reduce crosstalk and increase bandwidth capacity. By modifying these geometric parameters, the connector can support higher data rates (e.g., 12 Gbps per channel) while maintaining the same electrical interface standard, thus preserving compatibility without compromising content quality through compression.
3Reliability
If pin spacing is increased to reduce crosstalk, then signal integrity improves, but connector size increases
Solution Approach 1:
The patent utilizes a multi-column pad configuration that optimizes the distribution of pads across available space. By strategically positioning pads in multiple columns with appropriate spacing, the design achieves reduced crosstalk and improved signal integrity while maintaining a compact overall connector footprint, avoiding excessive size increase.
Solution Approach 2:
The patent applies different spacing characteristics to different regions of the connector. Critical adjacent channels have increased spacing to minimize crosstalk, while non-critical or shielded channels can have tighter spacing. This localized optimization of pad spacing achieves high signal integrity for sensitive signals without uniformly increasing the entire connector size.
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 design effectively reduces crosstalk, enabling higher data rates up to 12 Gbps per channel, supporting higher definition content while maintaining compatibility with earlier specifications.
Implementation Method 1
the pad for the dedicated ground is shaped and positioned to provide shielding between the differential pairs of different channels
Data Source
AI summary
In one embodiment, an HDMI connector includes a plurality of conductive paths. The plurality of conductive paths correspond to four channels, i.e., three differential data channels and one differential clock channel. Each channel includes three conductive paths, which correspond to a differential pair and a dedicated ground. Each conductive path has a contact on one end and a pin on the opposite end. The pins of the plurality of conductive paths are arranged to attach to corresponding surface mounting pads in at least two columns of contact points. For each channel, the pad for the dedicated ground is larger than the pads for the differential pair, thereby providing shielding between the differential pairs of different channels.