PCB Differential Pair Layout for Connector Impedance Stability
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Solution Overview
Problem
Impedance fluctuations occur in display devices due to lines passing through connectors, leading to signal quality deterioration.
Innovation Solution
The design of a printed circuit board with specific line pairs, where one line overlaps with the connector and the other does not, maintaining inverse signals, thereby reducing impedance differences and stabilizing signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lines pass through the connector, then connection is established, but impedance fluctuations occur and signal quality deteriorates
Solution Approach 1:
The patent applies asymmetry by intentionally designing unequal spacing between lines in a differential pair relative to the connector. Specifically, one line is positioned closer to the connector while the other is spaced farther away, creating asymmetric impedance paths that compensate for the connector's electromagnetic interference. This asymmetric arrangement balances the overall impedance and reduces signal quality deterioration caused by the connector's presence.
2Manufacturing precision
If one line is spaced apart from the connector while the other overlaps, then impedance is maintained, but line arrangement becomes asymmetric
Solution Approach 1:
The patent applies local quality by creating different spacing conditions for different lines in the differential pair at the connector region. Specifically, the first line is positioned with a first spacing from the connector while the second line is positioned with a second spacing, allowing each line to have optimized local characteristics. This local differentiation enables precise impedance control at the critical connector interface while maintaining overall signal integrity.
Data Source
AI summary
A display device includes a display panel for displaying an image, a printed circuit board including a line unit, a timing controller for displaying the image on the display panel in response to signals received from the line unit, and a connector disposed on the printed circuit board. The line unit includes a first line pair adjacent to the connector, the first line pair including a first line and a second line, wherein the first line of the first line pair is spaced apart from the connector.