Differential Signal Interface With Per-Pair Impedance Matching
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Solution Overview
Problem
The mini-LVDS interface lacks the ability to adjust eye patterns for each received signal, leading to impedance mismatch between transmission and receiving ends, causing signal reflections and display abnormalities such as blurriness and color spots due to poor eye diagrams.
Innovation Solution
A differential signal interface with moderating modules that detect and adjust impedance between the transmitting and receiving ends to match the impedance of corresponding differential pairs, using adjustable resistors and a programmable potentiometer to ensure optimal signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If impedance matching is not performed, then the device complexity is reduced, but signal transmission quality deteriorates due to reflections and poor eye patterns
Solution Approach 1:
The patent divides the transmission interface into multiple independent differential pairs, each equipped with its own moderating module for impedance adjustment. This segmentation allows independent optimization of each signal path without affecting others, improving overall signal transmission quality while keeping each module's complexity manageable
Solution Approach 2:
The patent introduces moderating modules as intermediary components between the transmitting end and receiving end. These modules act as mediators that detect impedance mismatches and automatically adjust differential pair impedances, eliminating signal reflections without requiring complex system-level control
2Reliability
If amplitude adjustment or pre-emphasis is used to improve eye pattern quality, then signal transmission quality improves, but electromagnetic interference increases
Solution Approach 1:
The patent changes the impedance parameter of differential pairs through moderating modules rather than adjusting signal amplitude or pre-emphasis. This parameter change approach improves eye pattern quality by ensuring proper signal transmission and reducing reflections, while avoiding the electromagnetic interference problems associated with amplitude-based solutions
3Adaptability or versatility
If different transmission lines with different materials and lengths are used, then adaptability to different display devices is improved, but signal transmission quality deteriorates due to varying eye patterns
Solution Approach 1:
The patent introduces dynamically adjustable moderating modules that can adapt their impedance settings based on the specific transmission line characteristics. This allows the system to maintain optimal signal transmission quality across different display devices with varying transmission line materials and lengths, while preserving the adaptability to different device configurations
Data Source
AI summary
The present application provides a differential signal interface and a display device adopting the differential signal interface. A plurality of different differential signals are transmitted between a transmitting end and a receiving end of the differential signal interface by a plurality of differential pairs. A plurality of moderating modules are disposed between the transmitting end and the receiving end. Each moderating module is connected to a corresponding differential pair and is configured to adjust the impedance of the transmitting end and/or the receiving end such that the impedance of the transmitting end and/or the receiving end matches the impedance of the corresponding differential pair.