HDMI Authentication Error Detection via CEC Feedback
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Solution Overview
Problem
In HDMI systems, authentication errors between TV and source providing apparatuses can go unrecognized, leading to misinterpretation of errors as operation issues in the TV, and users may mistakenly believe errors occur in the TV rather than the source providing apparatuses, especially in high-bandwidth digital content protection processing.
Innovation Solution
A digital content authentication system where an image display apparatus demands and receives authentication results from hierarchically connected source providing apparatuses via a CEC channel, outputs authentication results, and upon failure, repeatedly requests authentication results over a critical period to ensure accurate error recognition and user notification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If authentication is performed between TV and source providing apparatuses, then content protection reliability is improved, but authentication error detection capability deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the TV actively requests authentication results from source providing apparatuses through the CEC channel and displays the results. This feedback loop enables the TV to detect authentication errors that would otherwise remain hidden, resolving the contradiction between maintaining authentication reliability and detecting authentication errors.
2Device complexity
If authentication results are not actively queried, then system complexity is reduced, but error recognition accuracy deteriorates
Solution Approach 1:
The patent employs a self-service approach where the TV autonomously queries authentication results from connected source providing apparatuses without requiring external intervention. The TV initiates authentication result requests through the CEC channel and processes the responses, enabling error recognition while maintaining relatively simple system architecture.
3Reliability
If repeated authentication requests are sent upon failure, then error detection reliability is improved, but communication overhead increases
Solution Approach 1:
The patent implements periodic action by sending repeated authentication result requests at predetermined time intervals when initial authentication fails. This periodic querying continues for a specified duration, ensuring reliable error detection while controlling communication overhead through time-based limitations rather than continuous polling.
Data Source
AI summary
A digital content authentication system, an image display apparatus applied to the system, and a digital content authentication controlling method of the system are provided. The image display apparatus includes an interface section which demands authentication results from a plurality of source providing apparatuses through a bus and receiving responses to the demanding for the authentication result and an output section outputting the authentication results by the received response. Accordingly, the image display apparatus can recognize the authentication states of the source providing apparatuses.