HDMI Capability Version Negotiation for Video Compatibility
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Solution Overview
Problem
Existing HDMI systems face compatibility issues when transmitting and receiving capability information between source and sink devices, particularly with devices that are incompatible with updated HDMI versions, leading to incompatibilities and limitations in utilizing high-definition and ultra-high-definition image qualities without additional user manipulation.
Innovation Solution
A method for a source device to request, receive, and manage capability information from a sink device by performing a version change procedure, allowing it to handle different versions of capability information, including scenarios where the source device can or cannot read higher versions, and utilizing data structures with or without an OUI field, to ensure compatibility and support HD and UHD functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If capability information is transmitted using updated HDMI versions, then HD and UHD functions are improved, but compatibility issues arise with older source devices
Solution Approach 1:
The sink device changes the version parameter of capability information based on the source device's reading capability. The sink device determines whether the source device can read higher version capability information and adjusts the version parameter accordingly, ensuring compatibility while supporting HD and UHD functions when possible
Solution Approach 2:
The capability information version is made dynamic rather than fixed. The sink device dynamically adjusts the version of capability information transmitted based on real-time detection of the source device's reading capability, allowing the system to adapt between older and newer HDMI versions as needed
2Productivity
If capability information version is increased, then functionality is improved, but incompatibility with older source devices increases
Solution Approach 1:
The version parameter of capability information is changed dynamically based on the source device's capabilities. The sink device adjusts this parameter to match what the source device can read, ensuring both functionality and compatibility are maintained
Solution Approach 2:
The sink device uses feedback from the source device's reading capability to adjust the capability information version. By detecting whether the source device can read higher version information, the sink device receives feedback and modifies its transmission accordingly
Data Source
AI summary
The present specification proposes a method for a source device receiving capability information of a sink device. More specifically, the method comprises the steps of: transmitting, to a sink device, a message requesting for the reading of capability information of the sink device; receiving, from the sink device, first capability information of the sink device; on the basis of a capability information version of the sink device which is readable by a source device, carrying out a version change procedure for changing the capability information version of the sink device; and, on the basis of the version change procedure, receiving second capability information of the sink device, wherein the version of the second capability information is a higher than the version of the first capability information.