HDMI Power Control Signal Linkage Detection
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Solution Overview
Problem
Electronic devices connected through HDMI cables face issues where power outages cause unintended state changes, leading to devices being automatically turned on when they should be in standby mode, due to communication disruptions.
Innovation Solution
An electronic device with a communication unit, storage unit, detection unit, and transmitting unit that determines whether linkage information is stored before transmitting power control signals, preventing automatic state changes from standby to on during power outages by refraining from sending control signals when linkage information is stored.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the video camera transmits a power control signal to the TV when communication is enabled, then the TV is turned on automatically, but this causes unintended state changes after power outages
Solution Approach 1:
The system performs preliminary detection of communication enablement status before transmitting power control signals. By checking whether communication is enabled at the timing when a power control signal would be transmitted, the system prevents unintended automatic power-on after power outages while maintaining the automatic power-on function when properly intended.
2Extent of automation
If the video camera detects communication enablement and transmits control signals, then power control is automated, but this leads to false triggering after power outages
Solution Approach 1:
The system uses feedback from the communication enablement detection to control the transmission of power control signals. By continuously monitoring whether communication is enabled and using this feedback to determine when to transmit signals, the system achieves accurate automatic power control without false triggering after power outages.
3Loss of energy
If the TV returns to standby state after power outage, then power is saved, but the video camera incorrectly triggers power-on
Solution Approach 1:
The system performs preliminary detection of communication enablement status before transmitting power control signals. This preliminary check ensures that the system recognizes when the TV has returned to standby state after a power outage and prevents incorrect power-on triggering, thereby respecting user intent to save power.
Data Source
AI summary
An electronic device capable of controlling a power state of an external device from a first power state (ex. “Standby”) to a second power state (ex. “ON”) includes a determination unit operable to determine whether information indicating linkage is stored in a storage unit when it is detected that communication between the electronic device and the external device is enabled, and a transmitting unit operable to transmit a control signal for controlling power state of the external device. When the information indicating linkage is not stored in the storage unit, the transmitting unit stores the information indicating linkage and transmits the control signal for controlling power state of the external device to the second power state to the external device. When the information indicating linkage is stored in the storage unit, the transmitting unit refrains from transmitting the control signal to the external device.