HDMI Power Delivery via EDID Negotiation
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Solution Overview
Problem
High-speed wired interfaces like HDMI do not support power supply, necessitating separate external power devices for portable devices, which is inconvenient for continuous operation.
Innovation Solution
A method for transmitting and receiving power through HDMI by requesting and receiving power delivery support information and characteristic information between source and sink devices, using EDID and SCDCS, to enable power delivery without external cables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a wired interface like HDMI is used for data transmission, then high-speed data transmission and simplified wiring are achieved, but power supply function is not supported requiring separate external power devices
Solution Approach 1:
The HDMI interface is enhanced to perform multiple functions: both high-speed data transmission and power delivery. By integrating power delivery capability into the existing HDMI protocol and physical interface, the system eliminates the need for separate power cables while maintaining data transmission functionality.
Solution Approach 2:
The patent combines the data transmission function and power delivery function into a single HDMI interface. The power delivery feature is merged with the existing HDMI protocol by extending the EDID data structure and adding power management messages to the existing data channel.
2Reliability
If separate external power devices and wired interfaces are used, then power supply and data transmission are supported, but device complexity and ease of operation deteriorate due to requiring multiple connections
Solution Approach 1:
The patent merges the separate power cable connection and HDMI data cable connection into a single unified HDMI connection. This reduces the number of physical connections from two (power cable + HDMI cable) to one (HDMI cable only), thereby reducing device complexity and improving ease of operation.
Solution Approach 2:
The HDMI interface is designed to handle multiple functions simultaneously - data transmission, device identification via EDID, and power delivery. This multi-functionality eliminates the need for separate dedicated power connections while maintaining reliable power supply.
3Duration of action of moving object
If separate external power devices are used for portable devices, then continuous power supply is achieved, but ease of operation worsens due to always needing to connect external power cables
Solution Approach 1:
The patent combines power delivery with the existing HDMI connection that users already make for data transmission. Since portable devices are already connected via HDMI for video output, the power delivery function is activated through the same connection, eliminating the need for additional power cable connections and improving operational convenience.
Solution Approach 2:
The system automatically negotiates and activates power delivery through the HDMI interface without requiring user intervention to connect separate power cables. The source device detects the sink device's power capabilities through extended EDID information and automatically establishes power delivery, making the power supply process self-service and convenient.
Data Source
AI summary
A method for transmitting and receiving data of a source device using HDMI (High Definition Media Interface) is disclosed. A method for transmitting and receiving data of a source device using HDMI according to the present invention comprises requesting for reading out EDID (Extended Display Identification Data) to a sink device when the sink device is connected; receiving from the sink device EDID including power delivery support information of the sink device; transmitting required power characteristic information of the source device; and receiving power according to the required power characteristic information.