HDCP Authentication Reset Signal Adjustment
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Solution Overview
Problem
Existing digital image display systems often incorrectly determine the presence of a High Bandwidth Digital Content Protection (HDCP) authentication key, leading to the output of scrambled video data and abnormal screen displays due to authentication errors or communication issues between multimedia sources and set-top boxes.
Innovation Solution
An authentication method and apparatus that dynamically adjust the reset signal, specifically the Hot Plug Detection (HPD) signal duration, to re-attempt authentication with externally-connected multimedia sources, storing optimized reset settings for each source to ensure successful HDCP re-authentication and normal image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the settop box determines HDCP authentication key presence using a fixed reset signal duration, then the authentication process is simple, but authentication errors occur when the TV is turned on after the settop box or due to communication errors
Solution Approach 1:
The patent applies dynamics by making the reset signal duration adjustable rather than fixed. The controller dynamically changes the reset signal duration based on authentication results, allowing the system to adapt to different authentication scenarios and resolve errors that occur with fixed timing parameters.
Solution Approach 2:
The patent implements parameter changes by modifying the reset signal duration parameter. When authentication fails, the controller changes the duration parameter of the reset signal sent to the multimedia source, enabling re-authentication with different timing conditions to overcome the initial authentication failure.
2Measurement precision
If the settop box outputs scrambled digital video data due to erroneous authentication determination, then the authentication error is detected, but abnormal screen is displayed to the user
Solution Approach 1:
The patent implements feedback by continuously monitoring authentication results and using this information to adjust subsequent reset signal transmissions. When authentication fails or abnormal screens appear, the system feeds back this error information and modifies the reset signal parameters to attempt re-authentication, preventing persistent abnormal displays.
Solution Approach 2:
The patent applies preliminary action by proactively changing the reset signal duration before re-attempting authentication. Instead of waiting for repeated failures, the system preemptively adjusts the reset signal parameters based on detected authentication errors, preparing optimal conditions for successful re-authentication.
Data Source
AI summary
A method of authentication and an image display apparatus incorporating the method are provided. The method of authentication includes determining whether or not an error is generated in an authentication with an externally-connected multimedia source, and upon determination that the authentication error is generated, changing a reset signal to re-attempt the authentication and output to the multimedia source. As a result, successful High Bandwidth Digital Content Protection (HDCP) authentication can be provided at all times.