Stretchable Display Interconnect Layout for Stable Voltage Under Strain
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Solution Overview
Problem
Stretchable display devices face issues with connection line separation when stretched, leading to reliability concerns and voltage instability due to the separation of connection lines.
Innovation Solution
The implementation of a stretchable display device design that includes a ductile substrate with rigid substrates and connection lines, where contact pads are increased in number and size, and electrically connected via contact holes to stabilize voltage and reduce line separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If connection lines are made thinner to reduce resistance, then electrical performance improves, but the lines become more prone to separation during stretching
Solution Approach 1:
The connection line is divided into multiple segments by introducing contact pads and contact holes along its path. This segmentation allows the connection line to be electrically connected at multiple discrete points rather than as a single continuous line, reducing the risk that a break or separation at one point will disconnect the entire connection.
Solution Approach 2:
The patent transitions from a single-dimensional continuous connection line to a multi-dimensional structure by adding contact pads and contact holes at different locations along the connection line. This creates multiple contact points in space, distributing the mechanical stress and preventing separation.
2Adaptability or versatility
If the stretchable display device is made more flexible to improve stretchability, then adaptability improves, but structural reliability during stretching deteriorates
Solution Approach 1:
The rigid substrate is segmented into multiple sections with contact pads positioned at intervals along the connection lines. This segmentation allows the substrate to flex and stretch while maintaining electrical connections at multiple discrete points, preserving structural reliability during deformation.
3Reliability
If contact pads are increased in number and size to reduce separation, then connection reliability improves, but device complexity increases
Solution Approach 1:
The contact pads serve multiple functions: they provide electrical connection points, act as stress distribution areas to prevent line separation, and serve as anchoring points for the connection lines. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
Data Source
AI summary
A stretchable display device includes a lower substrate; a plurality of first substrates which is disposed on the lower substrate and includes a first area in which a plurality of sub pixel including a display element and a driving element is disposed and a second area excluding the first area; a plurality of second substrates configured to couple adjacent first substrates among the plurality of first substrates; and a plurality of connection lines which are disposed on the plurality of second substrates and are configured to couple the plurality of sub pixels, and in the second area, a first contact pad and a second contact pad are disposed and the first contact pad and the second contact pad are coupled to the plurality of connection lines via a plurality of contact holes.