Symmetric Serpentine Bridge Layout for Flexible Display Wiring
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Solution Overview
Problem
Current flexible display devices face challenges in maintaining uniformity and symmetry in driver unit and wiring arrangements across different areas, leading to potential deviations in output and functionality when bent or stretched, especially due to restrictions in wiring design based on shape and area.
Innovation Solution
The display device incorporates symmetric arrangements of first and second island portions and bridge portions with serpentine shapes across different areas, ensuring that driver units and wirings are disposed symmetrically with respect to a center line, allowing for equal design and reduced deviations in output between areas, even when the device is bent or stretched.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If driver units and wirings are arranged asymmetrically in different areas, then device complexity is reduced, but output uniformity and functionality consistency deteriorate when bent or stretched
Solution Approach 1:
The patent applies asymmetry in reverse - it deliberately creates symmetry between the first and second areas by arranging driver units and wirings in mirror-image configurations across the center line. This symmetrical arrangement ensures that both areas experience identical mechanical stress and electrical characteristics during bending or stretching, thereby maintaining output uniformity and functionality consistency while managing device complexity through standardized symmetric patterns.
Solution Approach 2:
The patent segments the display device into distinct first and second areas with clearly defined center line boundaries. By dividing the device into symmetric segments and independently designing wiring patterns for each segment that mirror each other, the patent achieves overall symmetry while maintaining manageable complexity through modular segmentation of the wiring design.
2Manufacturing precision
If wiring design is restricted by shape and area, then manufacturing precision is improved, but adaptability to deformation deteriorates
Solution Approach 1:
The patent employs serpentine-shaped wirings that can dynamically adapt to deformation. The serpentine configuration allows the wirings to stretch, compress, and bend flexibly when the display device is deformed, maintaining electrical connectivity while accommodating shape changes. This dynamic wiring design achieves both manufacturing precision through standardized serpentine patterns and adaptability to various deformation modes.
Solution Approach 2:
The patent changes the geometric parameters of the wirings by using serpentine shapes with specific curvature radii and pitch dimensions. These parameterized serpentine patterns can be manufactured with high precision using standard fabrication processes, while the inherent flexibility of the serpentine geometry allows the wirings to adapt to deformation by changing their effective length and curvature, thus achieving both precision and adaptability.
3Reliability
If symmetric arrangements are implemented across areas, then output uniformity is improved, but device complexity increases
Solution Approach 1:
The patent uses copying by creating the second area's wiring arrangement as a mirror image copy of the first area's wiring arrangement across the center line. This copying approach ensures functionality consistency and output uniformity between the two areas while simplifying the overall design process. Once the first area's wiring is designed, the second area is automatically determined by reflection, reducing the actual design complexity despite the symmetric complexity.
Solution Approach 2:
The symmetric wiring arrangement serves multiple functions: it ensures output uniformity between areas, provides balanced mechanical stress distribution during deformation, and simplifies manufacturing through standardized patterns. The universal symmetric design principle applies to both the first and second areas simultaneously, achieving functionality consistency while managing complexity through a single design rule that governs both areas.
Data Source
AI summary
A display device in which first and second areas respectively on opposite sides of a display area are defined includes a plurality of first island portions arranged in the first area and spaced apart from each other, a plurality of first bridge portions extending to or connecting the plurality of first island portions adjacent to each other, and spaced apart from each other by a plurality of first openings, a plurality of second island portions arranged in the second area and spaced apart from each other, and a plurality of second bridge portions extending to or connecting the plurality of second island portions adjacent to each other, and spaced apart from each other by a plurality of second openings. The plurality of first bridge portions and the plurality of second bridge portions each have a serpentine shape, the plurality of first island portions and the plurality of second island portions are arranged symmetrically with respect to a center line between the first area and the second area, and the plurality of first bridge portions and the plurality of second bridge portions are arranged symmetrically with respect to the center line.