DP Relay Packet Conversion for Stable MST Blanking Intervals
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Solution Overview
Problem
The instability of the horizontal blanking interval in Multi-Stream Transport (MST) mode of DisplayPort (DP) signals causes processing issues for back-end devices, leading to potential failure in decoding control symbols and secondary data due to varying and sometimes insufficient interval lengths.
Innovation Solution
A signal processing method that converts MST packets into Single-Stream Transport (SST) packets, adjusting the number of valid data symbols in each transfer unit to stabilize the horizontal blanking interval, and an EDID adjustment mechanism to control the horizontal blanking interval in the image generation device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MST mode is used to transmit multiple video streams, then bandwidth utilization is improved, but jitter occurs and horizontal blanking interval becomes unstable
Solution Approach 1:
The patent introduces a relay device as an intermediary between the image generation device and the back-end display device. This relay device receives MST packets, converts them to SST packets, and determines the number of valid data symbols based on horizontal blanking interval information. By acting as a mediator, the relay device stabilizes the horizontal blanking interval while maintaining the bandwidth efficiency of MST mode, thus resolving the contradiction between productivity improvement and reliability deterioration.
2Quantity of substance
If time slots are allocated for multiple streams in MST mode, then data transmission capacity is improved, but data waiting time increases causing jitter
Solution Approach 1:
The patent segments the MST packet transmission into multiple SST packets. The relay device divides the multi-stream data into separate single-stream transport packets, each with its own timing structure. This segmentation eliminates the waiting time caused by time slot allocation in MST mode, as each SST packet can be processed continuously without waiting for other streams, thereby reducing jitter while maintaining the ability to transmit multiple streams through sequential processing.
Data Source
AI summary
The present invention provides a signal processing method, wherein the signal processing method includes the steps of: receiving a MST packet that complies with a DP specification; converting the MST packet into multiple SST packets; determining a number of valid data symbols in a transfer unit included in the multiple SST packets based on information of a horizontal blanking interval indicated by the MST packet or the multiple SST packets; and transmitting the multiple SST packets to a back-end device.