Circuit Substrate Wiring for Narrow Frame Width
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Solution Overview
Problem
Existing circuit substrates for electrooptical devices face challenges in maintaining a small frame width due to increasing numbers of wiring lines and line widths, which complicates the routing of trunk and branch wiring lines and leads to increased parasitic capacitance and frame width.
Innovation Solution
The circuit substrate design includes a variable-external-shape portion with trunk and branch wiring lines that are bent and displaced to avoid overlapping, using a configuration where the first trunk wiring line is closest to the circuit portion and the second trunk wiring line is closer to the variable-external-shape portion, with branch wiring lines connected to unit circuits in a manner that minimizes parasitic capacitance and frame width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of wiring lines is increased to support higher resolution or larger device size, then the connectivity and functionality are improved, but the frame width increases and routing becomes more complex
Solution Approach 1:
The patent segments the wiring lines into trunk wiring lines and branch wiring lines. The trunk wiring lines extend in the first direction to provide main signal paths, while branch wiring lines extend in the second direction to connect to specific circuit blocks. This segmentation allows efficient routing of multiple wiring lines without increasing frame width, as each segment serves a specific function and can be optimized independently.
Solution Approach 2:
The patent introduces a second direction orthogonal to the first direction for routing branch wiring lines. While trunk wiring lines extend primarily in the first direction, branch wiring lines extend in the second direction to connect to circuit blocks. This two-dimensional routing approach allows multiple wiring lines to be accommodated without increasing frame width in the first direction, effectively using the second dimension to resolve routing congestion.
2Quantity of substance
If the line width is extended to support more wiring lines, then the signal transmission capability is improved, but the frame width and routing complexity increase
Solution Approach 1:
The wiring lines are segmented into trunk and branch portions with distinct routing directions. Trunk wiring lines carry signals in the first direction between circuit blocks, while branch wiring lines connect to specific circuit blocks in the second direction. This segmentation allows each segment to be optimized for its specific function, reducing overall routing complexity while maintaining signal transmission capability.
Solution Approach 2:
The patent uses two orthogonal directions for routing: the first direction for trunk wiring lines and the second direction for branch wiring lines. This dimensional separation reduces routing complexity by organizing wiring lines into distinct layers or levels, making the overall routing pattern more systematic and manageable despite the increased quantity of wiring lines.
3Adaptability or versatility
If wiring lines are routed to connect all circuit blocks, then the connectivity is improved, but parasitic capacitance increases
Solution Approach 1:
The patent segments the wiring lines into trunk and branch portions, where trunk wiring lines provide main signal paths and branch wiring lines provide localized connections. This segmentation reduces the total length of wiring lines required by eliminating redundant routing, thereby reducing parasitic capacitance while maintaining connectivity to all circuit blocks.
Solution Approach 2:
By routing branch wiring lines in the second direction orthogonal to the first direction, the patent creates more direct paths to circuit blocks without requiring wiring lines to traverse the entire frame width. This reduces the effective length of wiring lines and minimizes parasitic capacitance while ensuring all circuit blocks remain connected.
Data Source
AI summary
A circuit substrate includes a substrate portion having a variable-external-shape portion; a circuit portion, having a configuration in which circuit blocks adjacent to each other in a first direction; a plurality of trunk wiring lines bent along the circuit blocks displaced with respect to each other in a second direction; and a plurality of branch wiring lines, wherein the plurality of trunk wiring lines include a first trunk wiring line and a second trunk wiring line, and among the plurality of branch wiring lines, a plurality of branch wiring lines connected to a plurality of unit circuits constituting a center-side circuit block include at least a first branch wiring line connected to the first trunk wiring line and a second branch wiring line connected to the second trunk wiring line and disposed farther than the first branch wiring line from a end-side circuit block in the first direction.