Stretchable Display Layout for Stable Interconnect Elongation
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Solution Overview
Problem
Existing flexible display devices face challenges in maintaining stable electrical connections and manufacturing processes during stretching and shaping, due to differences in elongation between the display area and non-display area.
Innovation Solution
The display device incorporates first and second island portions with specific bridge portions connecting them, where the shape and width of the bridge portions differ between the display and non-display areas, allowing for controlled elongation and maintaining stable connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display area and non-display area have uniform elongation properties, then the manufacturing process is simplified, but stable electrical connections cannot be maintained during stretching
Solution Approach 1:
The patent applies local quality by creating different elongation characteristics in different regions of the substrate. The non-display area is designed with different elongation than the display area, allowing each region to have optimized properties for its specific function. This regional differentiation enables stable electrical connections in the non-display area while maintaining display functionality in the display area.
Solution Approach 2:
The substrate is segmented into distinct functional regions: display area with first island portions and first bridge portions, and non-display area with second island portions and second bridge portions. This segmentation allows independent optimization of each region's elongation characteristics and bridge portion designs, resolving the contradiction between reliability and complexity.
2Manufacturing precision
If the bridge portions have uniform shape and width across the display device, then the manufacturing process is simplified, but controlled elongation cannot be achieved
Solution Approach 1:
Different bridge portions are designed with different shapes and widths according to their specific functional requirements. First bridge portions in the display area have different characteristics from second bridge portions in the non-display area, enabling precise control of elongation in each region while maintaining manufacturing feasibility through standardized fabrication processes.
3Reliability
If the non-display area has the same elongation as the display area, then the device structure is simpler, but stable electrical connections during stretching cannot be maintained
Solution Approach 1:
The non-display area is designed with different elongation characteristics from the display area to maintain stable electrical connections during stretching. This local differentiation in elongation properties allows the device to adapt to stretching conditions while maintaining connection reliability, resolving the contradiction between reliability and adaptability.
4Manufacturing precision
If all island portions have uniform width, then the manufacturing process is simplified, but the specific elongation requirements of different areas cannot be met
Solution Approach 1:
First island portions in the display area have different width characteristics from second island portions in the non-display area. This local differentiation enables each region to meet its specific elongation requirements while maintaining manufacturing precision, resolving the contradiction between manufacturing precision and structural complexity.
Data Source
AI summary
A display device including a display area, and a non-display area outside the display area includes first island portions arranged in the display area, the first island portions being spaced apart from each other in row and column directions, first bridge portions respectively connecting two adjacent first island portions among the first island portions, second island portions arranged in the non-display area, the second island portions being spaced apart from each other, and second bridge portions respectively connecting two adjacent second island portions among the second island portions. A first width of each of the first island portions is less than a second width of each of the second island portions, and one of the second island portions correspond to a first island portion in an (i)th row and a first island portion in an (i+1)th row. Here, i is a positive integer.