HDMI Port Power Management via Predictive HDCP Handshake
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Solution Overview
Problem
Current HDMI technology experiences high power consumption and delays when switching between ports due to HDCP encryption synchronization requirements, necessitating a power-saving method for immediate switching.
Innovation Solution
The method involves detecting color depth information from an HDMI source, deriving horizontal lengths for each line, generating synchronization signals, and powering on the HDMI port for a predetermined time to obtain encrypted information before powering off, allowing for fast and power-efficient switching between HDMI ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If all HDMI ports are turned on to synchronize HDMI lane signals in advance, then switching speed is improved, but power consumption increases
Solution Approach 1:
The patent applies preliminary action by enabling the target HDMI port in advance before the switching operation is initiated. The system predicts the user's intended port switch and pre-activates the target port, so that when the switch occurs, synchronization is already complete or nearly complete, eliminating the visible delay. This resolves the contradiction by preparing the system state beforehand rather than reacting after the switch is triggered.
Solution Approach 2:
The patent implements dynamics by transitioning HDMI ports between different power states (enabled/disabled) based on predicted user behavior. Instead of keeping all ports continuously enabled (static high power state) or enabling them reactively (static low power state), the system dynamically adjusts port states based on usage patterns and switching predictions, optimizing the balance between switching speed and power consumption.
2Reliability
If HDCP synchronization is performed when switching HDMI ports, then content protection is maintained, but video display delay occurs
Solution Approach 1:
The patent applies preliminary action by performing HDCP synchronization and authentication processes before the user actually switches ports. The system predicts the intended port switch and initiates HDCP handshaking in advance, so that by the time the user completes the switch, authentication is already successful and video can be displayed immediately without visible delay.
Solution Approach 2:
The patent applies the skipping principle by rapidly executing the HDCP synchronization process in the background before the switch becomes visible to the user. The system rushes through the authentication steps during a prediction window, completing the security handshake so quickly that the user perceives no delay in video display after switching ports.
Data Source
AI summary
A power-saving method for an HDMI device is provided. The method includes detecting color depth information of video data from an HDMI source which is connected to the HDMI port, deriving a horizontal length for each line by fragment of a picture frame according to the color depth information, generating a plurality of synchronization signals according to the horizontal length for each line by fragment, and powering on the HDMI port, according to the synchronization signals, for a predetermined time period to obtain encrypted information from the HDMI source, and powering off the HDMI port after the predetermined time period.