Stretchable Display Substrate Layout to Protect Link Lines
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Solution Overview
Problem
Current display devices face challenges in providing stretchability to non-active areas and minimizing damage to link lines during the laser lift-off process, while also reducing the shrinkage rate difference between active and non-active areas.
Innovation Solution
A display device configuration with multiple non-active areas and strategically placed link lines, plate patterns, and line patterns ensures stretchability and minimizes damage by forming a stretching area between link lines, using a flexible substrate and specific pattern designs to distribute stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If link lines are disposed in the non-active area, then the stretchability of the non-active area is improved, but the link lines may be damaged during the laser lift-off process
Solution Approach 1:
The non-active area is divided into multiple regions with different structures. The second non-active area contains plate patterns and line patterns that form a stretching area, while other non-active areas have different configurations. This segmentation allows the link lines to be protected in specific zones while maintaining overall stretchability.
Solution Approach 2:
Plate patterns and line patterns are introduced as intermediary structures between the link lines and the stretching substrate. These patterns form a stretching area that acts as a buffer zone, absorbing stress during the laser lift-off process and protecting the link lines from direct damage while still allowing the non-active area to stretch.
2Adaptability or versatility
If the active area and non-active area have different shrinkage rates, then the functional requirements are met, but the shrinkage rate difference causes stress concentration and potential damage
Solution Approach 1:
Different regions of the substrate are given different local qualities through the strategic placement of plate patterns and line patterns. The second non-active area has a specific pattern density and configuration that creates a stretching area with controlled mechanical properties, allowing it to have an intermediate shrinkage rate between the active and other non-active areas, thus reducing stress concentration.
3Adaptability or versatility
If plate patterns and line patterns are formed together in the second non-active area, then the stretchability is ensured and link line damage is reduced, but the manufacturing process complexity increases
Solution Approach 1:
The plate patterns and line patterns are merged into a single integrated structure in the second non-active area. Instead of forming them as separate layers or stages, they are combined to create a unified stretching area that simplifies the overall manufacturing process while maintaining the protective function for the link lines.
Data Source
AI summary
A display device includes a lower substrate which includes an active area, a first non-active area on both sides of the active area, a second non-active area above the active area, and a third non-active area on both sides of the second non-active areas; a plurality of plate patterns disposed in the active area, the first non-active area, the second non-active area, and the third non-active area; and a plurality of line patterns which is disposed between the plurality of plate patterns in the active area, the first non-active area, and the second non-active area; and a plurality of link lines disposed on the plurality of plate patterns in the second non-active area.