Dynamic QR Code Display for Train Attendant Contact

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Solution Overview

Problem

Existing display systems in trains cannot dynamically display a two-dimensional code corresponding to changes in the contact point of an attendant, limiting passenger communication with attendants at different locations within the train.

Innovation Solution

A display control device that acquires information about the contact point of an attendant from a management device and transmits instructions to display a two-dimensional code on a display device within the train, allowing for real-time updates based on changes in the contact point.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a fixed two-dimensional code is displayed on the train display system, then passengers can contact the attendant, but the contact point cannot be updated when the attendant moves to different locations within the train

Engineering Contradiction:

Improvecontact point update capabilityVSAvoiddisplay control system complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements dynamic updating of the two-dimensional code on the display device. The display control device receives updated contact point information from the management device and regenerates the two-dimensional code accordingly, allowing the code to change as the attendant moves to different locations. This transforms the static display system into a dynamic one that adapts to changing contact points.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system establishes a feedback loop where the display control device continuously receives contact point information from the management device and updates the displayed two-dimensional code. This feedback mechanism ensures that the display reflects the current attendant location, enabling passengers to always contact the correct contact point.

Inventive Principle:

Principle #23Feedback

2Reliability

If the display control device continuously updates the two-dimensional code based on attendant location, then contact accuracy is improved, but information transmission frequency increases

Engineering Contradiction:

Improvecontact point accuracyVSAvoidinformation update time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The management device pre-processes and stores contact point information, making it ready for quick retrieval. When the attendant's location changes, the updated information is already prepared and can be immediately transmitted to the display control device, reducing the time lag in updating the two-dimensional code.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12236298B2Display control device, display control system, display control method, and recording medium

Publication Date: 2025.02.25 NEC CORP

AI summary

A display control method includes: acquiring information indicating a contact point of an attendant in a train from a management device storing the information indicating the contact point of the attendant in the train; and transmitting information for causing a display device in the train to display a two-dimensional code based on the acquired information.