Display Substrate Edge Protrusions to Prevent Film Cracking
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Solution Overview
Problem
Current substrates for display devices experience cracking issues due to inconsistent film shrinkage rates between different material layers, particularly between organic and inorganic materials, leading to defective patterns and broken wiring.
Innovation Solution
The substrate configuration includes a first film layer with protrusion structures facing a second film layer, where the film shrinkage rate of the second layer is less than the first layer, and the protrusion structures are distributed within a target pattern area to alleviate tensile stress and prevent cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the first film layer (organic material) and second film layer (inorganic material) are stacked with plane edges, then the substrate structure is simple and easy to manufacture, but the inconsistent film shrinkage rates cause tensile stress that cracks the second film layer
Solution Approach 1:
The patent applies local quality by creating protrusion structures at specific locations (edges of the first film layer within the distribution area of the target pattern) rather than uniformly modifying the entire film layer. These localized protrusions are positioned precisely where stress concentration occurs during shrinkage, providing targeted stress relief while maintaining the simplicity of the overall film layer configuration and manufacturing process
Solution Approach 2:
The patent employs curvature by designing the edges of the first film layer with protrusion structures instead of plane edges. The curved or rounded protrusion structures distribute stress more evenly compared to sharp plane edges, reducing stress concentration points that would otherwise lead to cracking of the second film layer during the shrinkage process
2Adaptability or versatility
If the first film layer is made of organic material and the second film layer is made of inorganic material, then the substrate achieves diverse functional properties, but the different material properties cause greater tensile cracking effects
Solution Approach 1:
The patent addresses the material compatibility issue by applying local quality through protrusion structures at the edges of the first film layer. These localized structural modifications provide stress relief zones that compensate for the inherent incompatibility between organic and inorganic materials, allowing the diverse functional properties of different materials to be maintained while preventing cracking at the interfaces
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration increases the deformable margin between film layers, reducing the likelihood of cracking and extending crack prevention, thereby enhancing the stability and performance of the substrate.
Implementation Method 1
Based on the protrusion structures, the substrate provided by the present application increases a deformable margin of the first film layer and the second film layer at the stacking position, so that a tensile force between both of the film layers is ameliorated
Data Source
AI summary
A substrate and a display device are provided. A first film layer of the substrate is formed on a third film layer and patterned to form a target pattern. A second film layer is formed on the third film layer and the first film layer. Within a distribution area of the target pattern, film edges of the first film layer are formed with protrusion structures facing the second film layer. Based on the protrusion structures, a deformable margin of the first film layer and the second film layer at a stacking position is increased, and a pattern of the second film layer is thus prevented from being cracked to generate cracks.