HDMI Multi-EDID Transfer Using Cache-Sized Sequential Groups
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Solution Overview
Problem
The increasing size of EDID required for supporting high resolution in sink devices leads to the need for larger storage space, which increases manufacturing costs and compromises compatibility with source devices, as existing methods either require additional memory or result in incomplete EDID replication.
Innovation Solution
An electronic device and method that supports multi-EDID read operations by dividing the EDID set into groups that fit within the cache memory size, allowing sequential transmission without increasing storage space, and using a new status and control data channel to manage the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the cache memory size is increased to store complete EDID sets for high resolution support, then the EDID storage capacity is improved, but the manufacturing cost increases
Solution Approach 1:
The EDID set is divided into multiple EDID groups, where each group can be stored in the existing cache memory. The sink device sequentially transmits these groups to the source device, which reconstructs the complete EDID set. This segmentation allows high-resolution support without increasing cache memory size, thereby reducing manufacturing costs while maintaining EDID storage capacity.
2Reliability
If the cache memory size is increased to store complete EDID sets, then the EDID replication completeness is improved, but the compatibility with existing source devices deteriorates
Solution Approach 1:
By dividing the EDID set into multiple transmittable groups, the system ensures that existing source devices can receive and process EDID information through standard cache memory limitations, while still achieving complete EDID replication through sequential transmission and reconstruction at the source device.
Solution Approach 2:
The patent introduces a temporal dimension to EDID transmission by sequentially transmitting multiple EDID groups over time rather than requiring simultaneous storage. This allows complete EDID replication without increasing spatial storage requirements, maintaining compatibility with existing source devices while achieving reliability.
3Ease of manufacture
If sequential transmission of EDID groups is implemented, then the manufacturing cost is reduced, but the transmission time increases
Solution Approach 1:
The EDID transmission is performed through periodic sequential transmission of individual EDID groups rather than attempting to transmit the entire EDID set at once. This periodic approach allows the system to work within existing cache memory constraints, reducing manufacturing costs while managing transmission time through efficient sequential operations.
Data Source
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AI summary
An operating method for an electronic device that communicates with a source device through a high definition multimedia interface (HDMI), includes determining whether the source device supports a multi-extended display identification data (EDID) read operation through a display data channel (DDC) and sequentially transmitting an EDID set stored in a non-volatile memory to the source device using an EDID group corresponding to a size of a cache memory, as a transmission unit, based on a size of the EDID set and the size of the cache memory, when it is determined that the multi-EDID read operation is supported.