Display Device Valley Portion Reduces Stress Concentration
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Solution Overview
Problem
Existing display devices face challenges in achieving robustness against mechanical stress, such as stretching and bending, while maintaining optimal performance and preventing cracks in inorganic films.
Innovation Solution
The display device incorporates a substrate with defined unit areas and an intermediate area, featuring an organic insulating layer, an emission element layer with overlapping emission elements, and an encapsulation layer that forms a valley portion overlapping the intermediate area, exposing the upper surface of the organic insulating layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device is made flexible and stretchable, then adaptability is improved, but stress concentration occurs in the intermediate area causing cracks in inorganic films
Solution Approach 1:
The patent divides the display device into first and second unit areas with emission elements, separated by an intermediate area. The encapsulation layer is segmented to form a valley portion that exposes the organic insulating layer in the intermediate area, creating distinct functional zones that reduce stress concentration and prevent cracks in inorganic films while maintaining flexibility.
Solution Approach 2:
The patent applies different structural characteristics to different regions: the emission element layers are disposed in the first and second unit areas with high emission density, while the intermediate area has reduced emission density and exposed organic insulating layer. This local differentiation allows the device to maintain flexibility in the intermediate area while preserving display performance in the unit areas.
2Manufacturing precision
If emission elements are densely arranged to improve display performance, then manufacturing precision is improved, but stress concentration increases in the intermediate area
Solution Approach 1:
The patent segments the display area into first and second unit areas with precisely arranged emission elements, separated by an intermediate area with lower emission density. This segmentation allows high-precision emission element arrangement in the unit areas while reducing stress concentration in the intermediate area through reduced element density.
Solution Approach 2:
The patent implements local quality differentiation by arranging emission elements with high density in the first and second unit areas for optimal display performance, while the intermediate area has reduced emission density to minimize stress concentration. The encapsulation layer is also locally configured with a valley portion in the intermediate area to expose the organic insulating layer, further reducing stress.
Data Source
AI summary
Provided is a display device including a substrate including a first unit area, a second unit area, and an intermediate area between the first unit area and the second unit area, an organic insulating layer disposed on the substrate, an emission element layer disposed on the organic insulating layer, the emission element layer including a first emission element overlapping the first unit area and a second emission element overlapping the second unit area, and an encapsulation layer disposed on the emission element layer, wherein the emission element layer and the encapsulation layer define a valley portion which overlaps the intermediate area and exposes an upper surface of the organic insulating layer.