HDMI Optical Link for Clock-Synchronized Auxiliary Data
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Solution Overview
Problem
Optical links in HDMI systems experience data transmission errors due to transmission delays, particularly in the transmission of auxiliary data related to rendering and setting of the display sink.
Innovation Solution
An optical link system that includes a control logic circuit to store and adjust auxiliary data transmitted via the display data channel (DDC) to match the clock signal of the display source, ensuring minimal transmission delay, and includes control logic circuits at both the display source and sink to manage data transmission and acknowledgment signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If auxiliary data is transmitted via DDC matching the clock signal at the display sink, then data transmission can occur, but transmission delays cause data transmission errors
Solution Approach 1:
The optical link receives and stores auxiliary data from the display sink in advance, before the display source requests it. This preliminary storage allows the data to be ready for immediate transmission when needed, eliminating delays caused by real-time retrieval and preventing transmission errors due to timing mismatches
Solution Approach 2:
The optical link acts as an intermediary device between the display sink and display source. It receives auxiliary data from the sink, stores it temporarily, and then transmits it to the source upon request. This intermediary role allows the optical link to buffer and synchronize data transmission, resolving the timing conflict between sink-side clock signaling and source-side data reception
2Productivity
If auxiliary data is transmitted in real-time via DDC, then transmission speed can be fast, but transmission delays cause data errors
Solution Approach 1:
The optical link performs preliminary reception and storage of auxiliary data from the display sink before the display source needs it. This advance preparation enables rapid transmission when the source requests the data, achieving both high speed and high reliability by decoupling the timing of data generation from data transmission
Data Source
AI summary
Provided is an optical link capable of preventing data transmission errors due to transmission delay. Also, provided is an optical link enabling rapid transmission of auxiliary data related to rendering of a display sink or setting of a main channel.