HDMI Power Negotiation via EDID and SCDC Parameters
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Solution Overview
Problem
High-speed wired interfaces like HDMI do not support power transfer, requiring external power cables for portable devices, which is inconvenient and limits their usage without additional devices.
Innovation Solution
The method enables power transmission and reception through HDMI by using the HDMI system to include power supply capabilities, where devices can act as both source and sink, utilizing EDID information and SCDC parameters to negotiate and manage power transfer over the HDMI cable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wired interface like HDMI is used for data transmission, then video/audio quality and latency are improved, but power transfer capability is lost requiring external power cables
Solution Approach 1:
The patent combines data transmission and power transfer functions into a single HDMI cable connection. The HDMI interface is enhanced to carry both high-definition video/audio signals and electrical power through the same cable, eliminating the need for separate power cables and external power adapters.
Solution Approach 2:
The HDMI cable and interface are designed to perform multiple functions simultaneously: transmitting video signals, audio signals, control data, and electrical power. This multi-functional approach allows a single connection to replace what would traditionally require multiple separate connections and devices.
2Duration of action of moving object
If external power cables and separate power supply devices are used, then continuous operation is enabled, but device complexity and connection requirements increase
Solution Approach 1:
The power supply device is integrated into the HDMI connection system itself. Rather than requiring a separate external power adapter and cable, the HDMI cable and connected devices (such as TV or display) incorporate power transfer capability, merging the power supply function into the existing data transmission infrastructure.
3Power
If HDMI cable is used for data transmission only, then bandwidth and picture quality are maintained, but power transfer function is absent
Solution Approach 1:
The HDMI interface is designed to handle multiple types of signals through the same physical connection. The cable and protocol support both high-bandwidth video/audio data transmission and electrical power transfer, making the system adaptable to different operational modes and device power requirements without sacrificing data transmission performance.
Data Source
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AI summary
Disclosed herein is a power supply method of a sink device using a High Definition Multimedia Interface (HDMI). The method may include being connected to a source device through the HDMI, not receiving a +5 V signal from the source device for a predetermined time, supplying power of a predetermined power level to the source device through the connected HDMI, receiving the +5 V signal from the source device, transmitting a Hot Plug Detect (HPD) signal, transmitting Extended Display Identification Data (EDID) information including power supply support information of the sink device to the source device, receiving request power characteristic information of the source device, and supplying power to the source device based on the request power characteristic information.