Virtual Terminal Video Signaling for Secure Thin-Client Deployment

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Solution Overview

Problem

Existing virtual terminal systems using differential signaling face limitations in signal transmission distance, compromising data security and usability.

Innovation Solution

A method employing unidirectional video and input/output signal transmission using video cables like VGA, without network protocols, to connect virtual terminals to thin clients, ensuring secure data transfer and remote deployment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If differential signaling is used for virtual terminal transmission, then data security is improved, but transmission distance is limited

Engineering Contradiction:

Improvedata securityVSAvoidtransmission distance

Core Design Contradiction:

ReliabilityVSLength of moving object

Solution Approach 1:

The patent introduces a signal conversion intermediary that transforms differential signals into video signals for transmission through video cables. This mediator enables long-distance transmission while maintaining security by preventing data packet interception, as video cables only transmit video data and not executable code or files.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces the traditional network protocol-based transmission system with a video signal transmission system. By substituting TCP/IP protocols with video signal transmission through cables like VGA, the system achieves both extended transmission distance and enhanced security, as video cables cannot transfer files or execute remote code.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If network protocols like TCP/IP are used for virtual terminal communication, then functionality is improved, but data security is compromised

Engineering Contradiction:

Improvecommunication functionalityVSAvoiddata security

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent extracts and removes network protocol processing capabilities from the virtual terminal communication path. By eliminating TCP/IP stack operations and file transfer protocols, the system prevents security vulnerabilities associated with protocol exploitation while maintaining essential display and input functions through video signal transmission.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The video cable acts as an intermediary that transmits only display information without enabling file transfers or code execution. This mediator breaks the security chain by preventing the transmission of executable content while maintaining visual output capability.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Length of moving object

If video cables are used for signal transmission, then transmission distance is improved, but data transfer capability is reduced

Engineering Contradiction:

Improvetransmission distanceVSAvoiddata transfer capability

Core Design Contradiction:

Length of moving objectVSLoss of information

Solution Approach 1:

The patent converts the limitation of video cables (inability to transfer files) into a security benefit. By utilizing this inherent restriction, the system achieves secure transmission where data leakage and file copying are physically prevented, while still delivering complete visual display information.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentEP4629071A1Working method of virtual terminal

Publication Date: 2025.10.08 ZHOU XINGCHANG

AI summary

The present invention discloses a working method of a virtual terminal, wherein during the process of sending data from a virtual machine to a thin client, data is transmitted without using a network protocol in one section, thereby ensuring data security.