HDMI Power State Detection Using CEC Cross-Verification
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Solution Overview
Problem
Inaccurate real-time identification of the power state between a TV and an HDMI device can lead to unnecessary power control, such as turning off an HDMI device when the TV is turned on, requiring users to manually turn it back on.
Innovation Solution
An electronic device with an HDMI connector that includes a first pin for power state indication and a second pin for HDMI-CEC communication, along with a processor to identify and manage power states through multiple indicators and signals, ensuring accurate synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If power synchronization is implemented between TV and HDMI device, then device management convenience is improved and power consumption is reduced, but inaccurate power state identification causes unnecessary power control operations
Solution Approach 1:
The patent segments the power state identification process into multiple independent detection mechanisms: a power indicator pin (first pin) that provides power state signals, and HDMI-CEC communication (second pin) that provides complementary power status information. By dividing the identification task across multiple channels, the system cross-validates power state data, ensuring accurate identification and preventing erroneous power control operations.
2Extent of automation
If power synchronization function is activated, then simultaneous control of TV and HDMI device power is achieved, but false power state detection leads to incorrect power control actions
Solution Approach 1:
The patent implements feedback mechanisms where the TV continuously monitors power state indicators from the HDMI device through the first pin and communicates power status through HDMI-CEC on the second pin. This bidirectional feedback allows the system to verify power states in real-time, detect discrepancies, and correct false detections, ensuring accurate simultaneous power control without erroneous actions.
3Speed
If the system checks power state immediately after booting, then responsiveness is improved, but premature detection may occur before the HDMI device is fully powered on
Solution Approach 1:
The patent prepares the power detection system in advance by configuring the first pin to monitor power indicator signals and establishing HDMI-CEC communication channels before full system operation begins. This preliminary setup ensures that when the HDMI device powers on, the TV is already ready to accurately detect and respond to power state changes without premature or missed detections.
Data Source
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AI summary
An electronic device is disclosed. The electronic device according to an embodiment of the present disclosure comprises: a high-definition multimedia interface (HDMI) connection unit for connecting the electronic device and an external electronic device by wire and including a first pin and a second pin; a memory including a power indicator identified based on an electrical signal received through the first pin and indicating a power state of the external electronic device; and at least one processor connected to the HDMI connection unit and the memory, wherein the at least one processor may identify a first power state of the external electronic device based on a first power indicator identified at which a first time has elapsed after booting of the electronic device, determine whether the external electronic device is a first type device supporting HDMI-CEC (consumer electronics control) communication through the second pin in response to identifying that the first power state is the first state, obtain first power state information from the external electronic device through the second pin in response to determining that the external electronic device is the first type device, and determine a final power state of the external electronic device based on the first power state information.