Wiring Substrate Layout for Low-Resistance Common Voltage Lines
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Solution Overview
Problem
In micro light-emitting diode displays, the limited wiring space for common and constant voltage signal lines leads to increased resistance and voltage drop, necessitating thicker lines or double-layer wiring, which raises costs.
Innovation Solution
A wiring substrate design with common voltage signal lines that traverse first units and second pad regions, utilizing wider widths and reusing second portions as ground pads, while maintaining sufficient spacing to reduce interference and eliminate the need for thicker lines or double-layer wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wiring space for common and constant voltage signal lines is limited, then the resistance and voltage drop increase, but increasing line thickness or adding double-layer wiring raises costs
Solution Approach 1:
The common voltage signal line is divided into multiple segments: first portions with greater width for low resistance conduction, and second portions with smaller width for grounding. This segmentation allows the line to optimize electrical performance while managing wiring space efficiently.
Solution Approach 2:
Different portions of the common voltage signal line have different widths tailored to their specific functions. The first portions have greater width where current conduction is critical, while the second portions have smaller width where grounding is the primary function, optimizing both electrical performance and space utilization.
2Reliability
If the common voltage signal line width is increased to reduce resistance, then the wiring space is consumed, but narrower lines increase resistance and voltage drop
Solution Approach 1:
The signal line is segmented into first portions with greater width for current conduction and second portions with smaller width for grounding, allowing optimization of electrical performance while managing space consumption.
Solution Approach 2:
The line width parameter is varied along the length of the common voltage signal line, with wider sections where low resistance is critical and narrower sections where space is constrained or grounding is sufficient.
3Device complexity
If the second portion of the common voltage signal line is reused as ground pad, then the wiring space is optimized, but the electrical interference may increase
Solution Approach 1:
The second portion of the common voltage signal line is merged with the ground pad function, combining signal return path and grounding into a single structural element, thereby simplifying the wiring structure.
Solution Approach 2:
The second portion acts as an intermediary between the common voltage signal line and the ground pad, providing a transition zone that maintains electrical integrity while enabling space optimization.
Data Source
AI summary
Provided is a wiring substrate. The wiring substrate includes a base substrate, a plurality of first units, a plurality of second pad regions, and a plurality of common voltage signal lines. Each of the plurality of first units includes a plurality of first pad regions, and each of the plurality of first pad regions includes at least one first pad group. Each of the second pad regions includes a plurality of second pads including ground pads and output pads. The plurality of common voltage signal lines are arranged along a first direction and extend along a second direction. The common voltage signal line travels through the first unit and the second pad region. Each of the plurality of common voltage signal lines includes a plurality of first portions and a plurality of second portions. The first portions and the second portions are connected successively in the second direction.