Display System CEC Message Filtering for Multi-Source HDMI
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Solution Overview
Problem
Existing video transmission systems using HDMI and CEC (Consumer Electronics Control) commands are not user-friendly and difficult to integrate with existing systems, limiting their functionality and compatibility.
Innovation Solution
A display system configuration that allows multiple video sources to be simultaneously displayed by using a filtering process to manage CEC messages, enabling independent CEC lines for each HDMI terminal, which enables simultaneous reception and processing of multiple video and audio signals, and switching between display modes without disrupting the video transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing HDMI CEC commands are used for multiple screen display, then backward compatibility is maintained, but the system becomes difficult to use and hard to integrate with existing systems
Solution Approach 1:
The display device acts as an intermediary that receives CEC commands from external equipment and translates them into appropriate actions for multiple screen display. It manages the CEC message routing to ensure proper control of multiple video sources while maintaining compatibility with existing HDMI CEC protocols, thereby resolving the contradiction between compatibility and ease of operation.
Solution Approach 2:
The display device is designed to handle multiple video sources and display modes simultaneously while using the existing HDMI CEC command set. By making the device universal in its ability to process various video inputs and control scenarios through a single integrated system, it achieves both backward compatibility and improved user-friendliness.
2Adaptability or versatility
If multiple video sources are displayed simultaneously, then display versatility is improved, but CEC message management complexity increases
Solution Approach 1:
The CEC message management is segmented by assigning dedicated CEC lines to each HDMI terminal. This segmentation allows independent control and message routing for each video source, simplifying the overall message management complexity while enabling multiple screen display capability.
Solution Approach 2:
The display device preliminarily configures CEC message routing and control parameters before receiving multiple video signals. By pre-establishing the message management framework and control structures, the system reduces the complexity of handling multiple video sources simultaneously.
3Productivity
If independent CEC lines are provided for each HDMI terminal, then simultaneous video reception is enabled, but system configuration complexity increases
Solution Approach 1:
The system segments the CEC control into independent lines for each HDMI terminal, enabling simultaneous and independent control of multiple video sources. This segmentation directly enables the simultaneous video reception capability while the automated message routing reduces the perceived configuration complexity.
Solution Approach 2:
The display device automatically manages and routes CEC messages between independent CEC lines without requiring manual configuration. The system performs self-service by autonomously establishing control relationships and managing message flow, thereby enabling simultaneous video reception while minimizing user-side configuration complexity.
Data Source
AI summary
Also in a video system in which a device responding to a multiple screen display function and a non-responding device are mixedly present, a communication message for a collaboration of the device which performs a multiple screen display operation is realized without exerting an influence on operations of the non-responding device. A video device including two or more video input ports and capable of simultaneously receiving videos output from multiple video source devices connected to the video input ports is configured so as to perform a predetermined filtering operation or message conversion when transmitting to the other video input ports a communication message for video device control to be converted through the video input ports.