HDMI Receiving Circuit Dynamic Channel Sleep Mode
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing HDMI and HDCP specifications result in increased power consumption when maintaining continuous HDCP authentication across multiple signal sources, leading to inconvenient display waiting times when switching between sources.
Innovation Solution
A receiving circuit with multiple channels and a control circuit that dynamically enables or disables decoding, descrambling, and key authentication functions based on whether the image frame is displayed on the panel, reducing power consumption by putting non-active channels into a sleep mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If continuous HDCP authentication is maintained for each HDMI port to enable quick signal source switching, then display waiting time is reduced, but power consumption increases significantly
Solution Approach 1:
The patent applies dynamics by making the HDCP authentication state changeable - channels can dynamically switch between active authentication mode and sleep mode based on whether they are currently displaying content. This allows the system to adapt its power consumption level to actual usage conditions while maintaining the capability for quick switching when needed.
Solution Approach 2:
The patent implements periodic action by having channels periodically check whether they need to maintain active authentication. When a channel is not currently displaying content, it transitions to sleep mode and only wakes up periodically or upon receiving a wake signal, rather than maintaining continuous authentication. This reduces power consumption while preserving the ability to quickly resume authentication when content needs to be displayed.
2Productivity
If multiple HDMI ports continuously maintain HDCP authentication to support multiple signal sources, then signal source switching speed is improved, but power consumption increases
Solution Approach 1:
The patent segments the authentication maintenance function by channel - each HDMI channel independently manages its own authentication state. Instead of requiring all channels to maintain continuous authentication, only the active channel(s) maintain authentication while inactive channels enter sleep mode. This segmentation allows quick switching capability to be preserved for active channels while reducing overall power consumption across the system.
Solution Approach 2:
The patent applies local quality by allowing different authentication states for different channels based on their current usage. Active channels maintain full authentication functionality for immediate switching capability, while inactive channels reduce to minimal authentication states. This localized approach to authentication quality optimizes the balance between switching speed and power consumption on a per-channel basis.
Data Source
AI summary
A receiving circuit includes a first channel, a second channel, a third channel and a control circuit, wherein the first channel is arranged to decode and descramble a first data stream to generate first data corresponding to first color information of an image frame, the second channel is arranged to decode and descramble a second data stream to generate second data corresponding to second color information of the image frame, and the third channel is arranged to decode and descramble a third data stream to generate third data corresponding to third color information of the image frame. The control circuit is configured to enable the first channel to make the first channel decode the first data stream, and enable or disable at least part of functions of the second channel and the third channel according to whether or not the image frame is displayed on a display panel.