Stretchable Display Interconnect Structure With Curved Tilted Substrates
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Solution Overview
Problem
Current display devices face challenges in minimizing connection line resistance and stress, particularly when stretched, which affects their flexibility and reliability.
Innovation Solution
A display device design featuring pixel substrates on a lower substrate with connection substrates having curved areas and connection lines with different tilt angles and thicknesses to reduce resistance and improve stretching reliability, allowing for increased flexibility and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the connection line width is reduced to improve stretching rate, then the stretching rate is improved, but the connection line resistance increases
Solution Approach 1:
The connection substrate has different tilt angles at different locations (first side surface vs second side surface), creating local structural variations that optimize both stretching performance and electrical conductivity in different regions of the connection line
Solution Approach 2:
The connection line is configured with three-dimensional tilt angles relative to the substrate surface, transitioning from a two-dimensional planar structure to a three-dimensional angled structure, which allows simultaneous optimization of stretching rate and resistance through spatial configuration
2Reliability
If the connection line thickness is increased to reduce resistance, then the connection line resistance is reduced, but the stress on the connection line increases
Solution Approach 1:
The connection line thickness is optimized within a specific range (100nm to 500nm) to achieve the balance between resistance and stress, rather than simply increasing or decreasing it without limits
Solution Approach 2:
The connection substrate incorporates curved areas with specific tilt angles, creating a curved three-dimensional structure that distributes mechanical stress while maintaining electrical conductivity
3Ease of manufacture
If the connection substrate has uniform thickness, then the manufacturing is simplified, but the stretching reliability is reduced
Solution Approach 1:
The connection substrate deliberately employs asymmetric thickness distribution with different tilt angles (first tilt angle vs second tilt angle) on opposite sides, creating an asymmetric structure that enhances stretching reliability while remaining manufacturable
Data Source
AI summary
A display device includes a plurality of pixel substrates disposed on a lower substrate to be spaced apart from each other and where at least one pixel is disposed; a plurality of connection substrates which includes a plurality of curved areas configured to connect a plurality of adjacent pixel substrates, among the plurality of pixel substrates; and a plurality of connection lines configured to electrically connect pads disposed on the plurality of adjacent pixel substrates on the plurality of connection substrates, and the connection substrate includes a first side surface and a second side surface and the second side surface has a different tilt angle from that of the first side surface, thereby improving the stretching reliability.