HDMI Daisy-Chain Projector Addressing via Connector Detection
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Solution Overview
Problem
Existing display systems with multiple devices coupled via HDMI suffer from complex association issues and deteriorated information throughput due to the need for separate logical addresses and complicated device association processes.
Innovation Solution
A display device system where each device is equipped with a detecting section to determine whether the output connector is coupled, deciding on a first or second logical address based on coupling status, and using communication control sections to manage CEC and specific commands for efficient communication between devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate logical addresses are allocated to multiple sink devices according to HDMI standard, then devices can be distinguished, but association control becomes complicated and information throughput deteriorates
Solution Approach 1:
The patent merges the association control functions into the image output device rather than implementing them in each display device. The image output device generates association information that identifies the correspondence between input connectors and output connectors, eliminating the need for complex distributed association control across multiple devices while maintaining reliable device distinction through the unified association information management
2Reliability
If association control section confirms association between sink devices and source devices, then output destination can be decided, but information throughput deteriorates
Solution Approach 1:
The patent implements preliminary action by having the image output device generate and distribute association information before actual image transmission begins. The association information is prepared in advance and made available to all display devices, eliminating the need for real-time association confirmation during operation and thus preventing throughput deterioration while ensuring accurate output destination determination
Data Source
AI summary
There is provided a projector included in four projectors daisy-chain coupled via an input connector of an HDMI standard and an output connector of the HDMI standard, the projector including a projecting section, a detecting section configured to detect whether the output connector is coupled, and a deciding section configured to decide a first logical address as a logical address of the projector when the detecting section does not detect the coupling of the output connector and decide a second logical address as the logical address of the projector when the detecting section detects the coupling of the output connector.