Optical HDMI Cable Design for Signal Integrity and Thickness Reduction

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Solution Overview

Problem

Traditional HDMI cables face signal degradation and thickness issues due to electrical signals, especially in long-distance applications, limiting their effectiveness in supporting high-definition multimedia interfaces.

Innovation Solution

A full-optical HDMI cable design featuring specific optical channel arrangements and bonding pad configurations, utilizing A/V transceivers and sideband transceivers with laser diodes and photodetectors to transmit optical signals, including control and power information, and audio return channels, which reduces signal loading and cable thickness while allowing for same circuitry usage on both ends.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If electrical signals are used in traditional HDMI cables, then the cable can transmit audio/video data, but the cable thickness increases and signal degradation occurs in long-distance applications

Engineering Contradiction:

Improvesignal integrityVSAvoidcable thickness

Core Design Contradiction:

ReliabilityVSLength of stationary object

Solution Approach 1:

The patent replaces electrical signal transmission with optical signal transmission using laser diodes and photodetectors. This substitution eliminates the need for thick copper conductors, allowing for a thinner cable design while improving signal integrity and enabling long-distance transmission without signal degradation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the transmission medium from electrical conductors to optical fibers, fundamentally altering the physical parameter of signal transmission. This parameter change enables both thinner cable construction and improved signal quality over long distances, resolving the contradiction between cable thickness and signal integrity.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If electrical signals are used in traditional HDMI cables, then the cable can transmit audio/video data, but signal degradation occurs in long-distance applications

Engineering Contradiction:

Improvesignal integrityVSAvoidtransmission distance

Core Design Contradiction:

ReliabilityVSLength of moving object

Solution Approach 1:

The patent replaces electrical signal transmission with optical signal transmission using laser diodes and photodetectors. This substitution eliminates signal degradation issues associated with electrical conductors over long distances, enabling reliable transmission over extended ranges while maintaining signal integrity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If optical signals are used instead of electrical signals, then signal integrity and transmission distance are improved, but device complexity increases due to additional components

Engineering Contradiction:

Improvesignal integrityVSAvoidcable structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the optical transmission components (laser diodes, photodetectors, optical fibers) into an integrated cable structure, replacing the traditional electrical conductor system. While this introduces new components, the merging approach consolidates them into a unified optical transmission path, managing the complexity through integration rather than separate discrete elements.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent replaces the entire electrical signal transmission system with an optical system, fundamentally changing the cable architecture. This substitution, while introducing new components, simplifies the overall system by eliminating the need for thick copper conductors and associated shielding, managing complexity through a paradigm shift rather than incremental changes.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

The solution enhances signal integrity and reduces cable thickness, improves data transmission rates, and lowers production costs by enabling efficient optical data transmission and same-circuitry implementation, addressing signal degradation and thickness challenges in traditional HDMI cables.

Implementation Method 1

a first sideband transceiver configured to drive a first laser diode to transmit a first optical sideband signal

Methodology Applied

Scientific EffectLight emission from laser diode: Laser

Implementation Method 2

a first photodetector configured to receive a second optical sideband signal

Methodology Applied

Scientific EffectPhotoelectric conversion: Photoelectric Effect

Data Source

PatentUS11240554B2HDMI apparatus using optical communication

Publication Date: 2022.02.01 ARTILUX INC

AI summary

A HDMI apparatus is provided. The HDMI apparatus includes a first audio/video transceiver (A/V transceiver) configured to transmit an optical A/V signal to a second A/V transceiver; and a first sideband transceiver configured to drive a first laser diode to transmit a first optical sideband signal including a first control information or a first power information; wherein the first control information or the first power information is converted by a first Serializer/Deserializer (SERDES).