Display Interface Reverse Control via I2C Address Segmentation

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Solution Overview

Problem

Existing display devices lack effective methods to implement reverse control functions using modern transmission interfaces without interfering with image data transmission, and existing protocols like EDID and HDCP are not suitable for seamless integration with input/output devices.

Innovation Solution

A display device with a controller circuit and input/output interface circuit that utilizes the I2C bus protocol to assign unique slave addresses to control devices, allowing reverse control of electronic devices through a shared image transmission interface without affecting existing protocols, using a driver to simulate human interface devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If reverse control function is established on the image transmission protocol, then the electronic device can be controlled through the display device, but it may interfere with the original image data transmission

Engineering Contradiction:

Improvereverse control capabilityVSAvoidimage data transmission stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent segments the image transmission interface by assigning different slave addresses to different control devices, allowing multiple control functions to coexist on the same interface without interfering with each other or the image data transmission

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The display device acts as an intermediary between the control device and the electronic device, receiving commands from the control device and transmitting them to the electronic device through the image transmission interface without direct connection between control device and electronic device

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If existing protocols like EDID and HDCP are used for reverse control, then the display device can control electronic devices, but the protocols are not suitable for seamless integration with input/output devices

Engineering Contradiction:

Improveprotocol compatibilityVSAvoidseamless integration with input/output devices

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The patent makes the image transmission interface universal by enabling it to serve multiple functions: image data transmission, reverse control, and input/output device communication, all through the same interface without requiring separate protocols

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent changes the operational parameters of the image transmission interface by using slave addresses to differentiate between control devices and input/output devices, allowing the same interface to handle different types of communication seamlessly

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12493361B2Display device and reverse control method thereof

Publication Date: 2025.12.09 REALTEK SEMICON CORP

AI summary

A reverse control method includes the following operations: connecting an electronic device through an image transmission interface in a display device to receive image data from the electronic device and display the image data; connecting a control device through the display device to receive a first command from the control device; and transmitting, by the control device, the first command to the electronic device through the image transmission interface to operate as a human interface device connected to the electronic device, such that the electronic device operates in response to the first command.