Stretchable Wiring Via Structure for Reliable Electrode Alignment
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Solution Overview
Problem
In conventional stretchable devices, the positional accuracy between vias connecting stretchable wirings is inconsistent, leading to potential positional deviation and reduced connection reliability between electrode portions, especially when the device stretches and contracts.
Innovation Solution
A stretchable device design incorporating an interlayer sheet with via portions that include both connection and non-connection regions, ensuring precise positional alignment and maintaining reliability even under stretching and contraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional vias are used to interconnect stretchable wirings, then the device can be manufactured with simpler processes, but positional accuracy between vias and electrode portions deteriorates leading to reduced connection reliability
Solution Approach 1:
The via structure is segmented into two distinct portions: a first via portion extending from the lower surface to the inner surface of the interlayer insulating film, and a second via portion extending from the inner surface to the upper surface. This segmentation allows each via portion to be optimized independently for its specific function, with the first via portion providing stable mechanical anchoring and the second via portion ensuring precise electrical connection to the upper electrode portion.
Solution Approach 2:
The invention extends the via structure into the thickness dimension of the interlayer insulating film, creating a three-dimensional via system rather than a simple planar connection. The first via portion penetrates through the bulk of the insulating film to reach the lower electrode, while the second via portion provides the upper connection point, effectively utilizing the vertical dimension to improve both mechanical stability and electrical connection reliability.
2Adaptability or versatility
If the device stretches and contracts, then the stretchable function is achieved, but positional deviation between vias and electrode portions increases reducing connection reliability
Solution Approach 1:
The first via portion extends deeper into the interlayer insulating film than conventional single-portion vias, creating a longer anchoring path that anticipates and compensates for the positional deviations caused by stretching. This extended structure provides a mechanical cushion that maintains connection stability even when the device undergoes deformation, preventing complete disconnection by providing redundant mechanical engagement.
Solution Approach 2:
Different portions of the via structure have different functional qualities: the first via portion is optimized for mechanical anchoring and stress distribution within the insulating film, while the second via portion is optimized for precise electrical connection to the upper electrode. This local differentiation allows the structure to simultaneously accommodate stretching movements while maintaining reliable electrical connections.
Data Source
AI summary
A stretchable device that includes: a stretchable substrate; a first stretchable wiring on the stretchable substrate and having a first electrode portion; a second stretchable wiring on the first stretchable wiring and having a second electrode portion; and an interlayer sheet between the first stretchable wiring and the second stretchable wiring, in which the interlayer sheet includes a sheet portion and at least one first via portion in the sheet portion, and the first via portion has in a part thereof a connection region connecting the first electrode portion and the second electrode portion.