Flexible Display Thin-Film Layer with Protruding Particles
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Solution Overview
Problem
Flexible display devices face challenges in durability, particularly when subjected to repeated bending, as existing technologies do not effectively distribute tensile stress and absorb external impacts, leading to potential cracking and degradation.
Innovation Solution
A flexible display device design incorporating a thin-film layer with a base layer and protruding particles on a flexible window member, which distributes tensile stress and absorbs external impacts, enhancing impact resistance and durability through a specific arrangement of particles and adhesion members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible display device is designed to be bent repeatedly, then the device achieves flexibility and adaptability, but the durability and reliability deteriorate due to tensile stress concentration and external impact
Solution Approach 1:
The patent applies local quality by creating a thin-film layer with non-uniform structure containing particles of different sizes, shapes, and protruding heights distributed at specific locations. This local variation in the film structure allows different regions to handle stress differently, with particles strategically positioned to absorb tensile stress during bending while maintaining overall flexibility of the display device.
Solution Approach 2:
The patent uses composite materials by combining a base layer with dispersed particles within the thin-film layer. This composite structure integrates materials with different mechanical properties, where the matrix material provides flexibility and the particulate reinforcement absorbs stress and impacts, achieving both flexibility and durability simultaneously.
2Manufacturing precision
If the thin-film layer uses a smooth uniform structure, then the manufacturing precision is improved, but the impact resistance deteriorates due to inability to distribute tensile stress
Solution Approach 1:
The patent resolves this contradiction by introducing local quality variations through particles dispersed in the thin-film layer. While the overall film maintains controlled uniformity for manufacturability, local regions contain particles with specific properties that create stress distribution zones, enabling impact resistance without sacrificing manufacturing feasibility.
Solution Approach 2:
The patent applies parameter changes by varying particle characteristics (size, shape, protruding height, material composition) within the thin-film layer. These parameter variations allow the film to maintain adequate uniformity for manufacturing while creating localized stress absorption zones that significantly improve impact resistance and tensile stress distribution.
3Reliability
If particles are added to the thin-film layer to absorb impact, then the durability is improved, but the device complexity increases due to additional manufacturing steps
Solution Approach 1:
The patent applies merging by integrating particle incorporation into the existing thin-film deposition process. Rather than adding separate particle application and assembly steps, the particles are introduced during the film formation process itself, combining multiple functions (film creation, particle placement, and structural integration) into a single manufacturing operation, thereby reducing overall process complexity.
Solution Approach 2:
The patent employs self-service mechanisms where the particles are automatically distributed and positioned within the thin-film layer during deposition. The manufacturing process itself facilitates particle incorporation without requiring external intervention or complex positioning systems, allowing the structure to self-organize into the desired stress-absorbing configuration.
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
The design significantly improves the impact resistance and durability of flexible display devices by effectively distributing stress and absorbing external impacts, reducing the likelihood of cracking and enhancing the reliability of the device during repeated bending.
Implementation Method 1
distributes tensile stress and absorbs external impacts
Implementation Method 2
absorbs external impacts, enhancing impact resistance
Implementation Method 3
a first adhesion member configured to couple the thin-film layer to the display member
Data Source
AI summary
A flexible display device according to an embodiment includes a display member, a window member on the display member and having a rear surface facing the display member and a top surface located opposite to the rear surface, a thin-film layer including a base layer having a first surface contacting the rear surface and a second surface located opposite to the first surface and a plurality of particles coupled to the second surface, a protection member spaced apart from the window member, the display member being between the protection member and the window member, a first adhesion member configured to couple the thin-film layer to the display member, and a second adhesion member configured to couple the display member to the protection member. Each of the particles protrudes from the second surface of the base layer to the protection member.