HDMI Receiving Circuit Power Management via Dynamic Authentication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing HDMI and HDCP specifications cause display devices to experience significant power consumption when maintaining continuous authentication across multiple signal sources, leading to inconvenient delays when switching between sources.
Innovation Solution
A receiving circuit with a decoder, frame key calculating circuit, line key calculating circuit, control circuit, and timer is used to dynamically enable or disable these components based on whether an image frame is displayed, alternating between normal and sleep modes to reduce power consumption while maintaining HDCP authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If HDCP authentication is continuously maintained to enable quick switching between signal sources, then display waiting time is reduced, but power consumption increases significantly
Solution Approach 1:
The patent applies dynamics by making the authentication mode adjustable and adaptable. The system can dynamically switch between continuous authentication mode (for quick switching) and periodic authentication mode (for power saving) based on user needs. The frame key calculating circuit is controlled to operate in different modes: continuously enabled for quick switching, or periodically enabled to save power while maintaining authentication capability.
Solution Approach 2:
The patent implements periodic action by using a timer to control the frame key calculating circuit to operate periodically rather than continuously. When power saving is prioritized, the circuit performs authentication at specific intervals (e.g., at vertical synchronization signals) rather than continuously, significantly reducing power consumption while still maintaining HDCP authentication capability.
2Reliability
If continuous authentication is performed for all connected signal sources, then authentication reliability is maintained, but power consumption increases
Solution Approach 1:
The patent applies local quality by differentiating authentication treatment for different signal sources and different time periods. Instead of uniform continuous authentication for all sources, the system applies authentication selectively: continuous for active sources, periodic for standby sources, and only when necessary. This localized approach maintains reliability where needed while saving power where not needed.
Solution Approach 2:
The patent changes the authentication parameter from binary (continuous or none) to multi-level (continuous, periodic, or on-demand). By adjusting the authentication frequency and timing parameters based on signal source status and user preferences, the system maintains authentication reliability while optimizing power consumption through parameter optimization.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention provides a receiving circuit (120_1 - 120_N) applied to an HDMI, wherein the receiving circuit (120_1 - 120_N) includes a decoder (220), a frame key calculating circuit (230), a line key calculating circuit (240) and a control circuit (250). In the operations of the receiving circuit (120_1 - 120_N), the decoder (220) decodes a data stream to generate at least one image frame, the frame key calculating circuit (230) is arranged to calculate a frame key according to the image frame, the line key calculating circuit (240) is arranged to calculate a plurality of line keys according to the image frame, and the control circuit (250) determines to turn off or turn on the line key calculating circuit (240) according to whether or not the image frame is displayed on a display panel.