HDMI Control Device Virtual Cable Disconnection for Stable Signal Adjustment
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Solution Overview
Problem
Image display apparatuses connected via digital signal cables, such as HDMI, often experience issues like no image display, flickering, or noise due to unsuitable image signals, copy protection malfunctions, cable quality deterioration, or insufficient receiving circuit performance, leading to unstable sync frequencies and incorrect adjustments.
Innovation Solution
A control device with a digital signal input section, a detecting section, an adjusting section, and a control section that allows virtual disconnection of the digital signal cable by controlling the output of detection signals during adjustments, preventing false HDCP authentication and enabling stable image display and equalizer adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the detecting section outputs the detection signal during setting image display, then HDCP authentication can be performed, but false authentication occurs and adjustment cannot be properly performed
Solution Approach 1:
The control section determines in advance whether to display a setting image before HDCP authentication is completed. By performing this determination beforehand, the system prevents the detection signal from being output during setting image display, thereby avoiding false authentication while maintaining proper adjustment operability.
2Ease of operation
If the setting image is displayed overlapped with the input image signal, then user can adjust settings, but the input image signal becomes unstable and sync frequency becomes unstable
Solution Approach 1:
The system extracts the setting image display function from the normal image display path. By displaying the setting image separately rather than overlapped with the input image signal, the instability caused by overlapping displays is eliminated while maintaining user adjustment operability.
3Reliability
If adjustment is performed in a state where authentication is successfully performed, then authentication is completed, but abnormal digital signal is included when adjustment value is switched
Solution Approach 1:
The control section applies preliminary anti-action by determining whether to display the setting image before HDCP authentication is completed. This prevents the abnormal digital signal from being included during adjustment value switching, as the authentication state is properly managed before any adjustment operations occur.
Data Source
AI summary
A control device includes: a digital signal input section through which a digital signal from an external device is input through a digital signal cable; a detecting section which detects connection with the external device and then outputs a detection signal to the external device; an adjusting section which performs adjustment for the digital signal; an information input section through which display request information about a setting image which receives input of setting information about the adjustment is input; and a control section which controls the detecting section not to output the detection signal if the display request information is input.