Display Communication Circuit Using Non-Standard Signals Over Video Cable
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Solution Overview
Problem
The complexity of deploying and maintaining multiple communication cables for connecting multiple display devices in public display applications, such as shopping malls and airports, increases with the number of devices, making it cumbersome and inefficient.
Innovation Solution
A communication technique that uses a single video cable compliant with a digital display interface standard to transmit both video and non-standard communication signals, allowing for simplified topology and reduced cable requirements by utilizing additional pins for communication purposes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate communication cables are used for each display device, then communication reliability is improved, but device complexity and cable quantity increase
Solution Approach 1:
The patent combines video signal transmission and communication functions into a single cable connection. The video cable that normally carries only video signals is made to carry both video signals and communication signals, eliminating the need for separate communication cables and reducing overall system complexity while maintaining communication reliability
Solution Approach 2:
The video cable is designed to perform multiple functions: it serves as both a video signal transmission medium and a communication channel. By making the cable universal for both purposes, the system reduces the total number of cables needed while ensuring reliable communication across multiple display devices
2Adaptability or versatility
If standard digital display interface cables are used, then video distribution is achieved, but communication capability is lost
Solution Approach 1:
The system dynamically configures the cable's functionality based on the connection type. When connecting display devices, the cable operates in video transmission mode compliant with digital display interface standards. When communication is needed, the same cable dynamically switches to carry communication signals, allowing the interface to adapt its function without compromising standard compliance for video distribution
Solution Approach 2:
The cable's signal transmission capability is segmented into different functional channels: video signal channels that maintain standard compliance and communication signal channels that enable device-to-device communication. This segmentation allows the same physical cable to support both standard video distribution and custom communication protocols simultaneously
Data Source
AI summary
A circuit for use in a first display device to facilitate communication with a second display device is provided. The first display device and the second display device each include a connector compliant with a digital display interface standard. The circuit includes a digital display interface circuit and a control unit. The digital display interface circuit is used for transmission or receiving of video data according to the digital display interface standard, the digital display interface circuit for being connected to the connector of the first display device. The control unit is configured to transmit at least one first communication signal through at least one first pin of the connector of the first display device to communicate with the second display device, wherein the at least one first communication signal is non-standard with respect to the digital display interface standard.