Flexible Display Substrate with Organic Fillers for Stress Distribution
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Solution Overview
Problem
Current display devices face challenges in expanding the image display area while maintaining reliability, particularly in mobile electronic devices where space is limited and structural integrity is crucial, especially when the device is bent to form angles.
Innovation Solution
The display device incorporates a substrate with a central area and corner areas featuring extension areas and organic fillers, along with encapsulation layers and a light-transmissive organic material layer, to increase the display area and enhance structural reliability by distributing stress and maintaining a constant interval between extension areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the display area is expanded by bending the substrate, then the image display area increases, but stress concentration and structural reliability deteriorate
Solution Approach 1:
The substrate is divided into a central area and multiple extension areas, with the extension areas being bendable while the central area remains relatively flat. This segmentation allows the display device to expand the image display area through bending without compromising the structural integrity of the entire substrate.
Solution Approach 2:
Organic fillers are introduced as intermediary materials in the gaps between adjacent extension areas. These fillers maintain constant intervals between extension areas during bending, distribute stress evenly, and prevent stress concentration that would otherwise occur at the boundaries of bent regions.
2Area of moving object
If extension areas are bent to expand display area, then the display area increases, but unintended overlapping occurs between extension areas
Solution Approach 1:
Organic fillers serve as intermediary elements positioned in the gaps between adjacent extension areas. These fillers maintain constant intervals between extension areas during bending operations, preventing unintended overlapping while allowing the extension areas to be positioned at predetermined angles relative to the central area.
Solution Approach 2:
The organic fillers are designed with specific material properties (flexibility, adhesion) that allow them to maintain constant spacing between extension areas during bending. The fillers change their configuration parameters to accommodate the bent state while preserving the interval consistency required for precise manufacturing.
3Adaptability or versatility
If the substrate is made flexible for bending, then adaptability improves, but structural strength deteriorates
Solution Approach 1:
The substrate is segmented into a rigid central area that maintains structural strength and flexible extension areas that provide bending capability. This segmentation allows the display device to achieve adaptability for different form factors while preserving structural integrity in the central region where strength is critical.
Solution Approach 2:
The display device employs a composite structure combining the substrate material with organic filler materials. This composite construction provides both the flexibility needed for bending and the structural strength required for reliability, as the organic fillers reinforce the bent regions while allowing deformation.
Data Source
AI summary
A display device includes a substrate including a central area and a corner area, the corner area extending in a direction away from the central area and including a plurality of extension areas including distal portions spaced apart from each other, a plurality of display elements arranged on a front surface of the substrate and arranged in the central area and the plurality of extension areas, and a first organic filler between adjacent extension areas among the plurality of extension areas. The first organic filler is between distal portions of the adjacent extension areas, and the adjacent extension areas and the first organic filler are disposed on a curved surface of the substrate that is different from a surface of the substrate on which the central area is disposed.