Segmented Pillar Protective Sheet for OLED Scratch Resistance
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Solution Overview
Problem
Existing organic light emitting display apparatuses face challenges in protecting the display units from external shocks and maintaining the integrity of hard coating layers during bending and stretching, which can lead to cracks and delamination.
Innovation Solution
A protective sheet with a base substrate and elastically bendable protective units, each featuring a pillar with a hard coating layer on its lateral surfaces, is integrated into the organic light emitting display apparatus. The pillars are spaced apart, allowing neighboring hard coating layers to overlap and absorb stress, preventing scratches and maintaining the hard coating layer's integrity during bending and stretching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a hard coating layer is applied continuously over the entire surface to protect the display unit, then scratch resistance is improved, but cracks and delamination occur during bending and stretching
Solution Approach 1:
The continuous hard coating layer is divided into multiple discrete protective units (islands) spaced apart from each other. Each protective unit is formed as a separate entity rather than a continuous layer, allowing independent deformation without causing cracks or delamination when the display apparatus is bent or stretched.
Solution Approach 2:
The hard coating layer is applied selectively only in specific locations where protection is needed, rather than as a uniform continuous layer. The protective units are distributed across the surface at predetermined intervals, providing localized protection while maintaining flexibility in other areas.
2Object-affected harmful factors
If the protective layer is made continuous to ensure complete coverage, then protection effectiveness is improved, but flexibility and bendability deteriorate
Solution Approach 1:
The protective layer is segmented into multiple discrete protective units that can independently deform. This segmentation allows the overall structure to maintain flexibility and adaptability while each individual unit provides localized protection, resolving the contradiction between complete coverage and flexibility.
3Area of stationary object
If the protective units are placed close together to maximize coverage, then protection area is improved, but stress concentration during bending increases
Solution Approach 1:
The protective units are distributed with optimized spacing that balances coverage area with stress resistance. The intervals between units are carefully controlled to prevent stress concentration while maximizing the total protected area, allowing the structure to withstand bending forces effectively.
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 protective sheet effectively prevents scratches and maintains the hard coating layer's stability even with repeated bending and stretching, ensuring the organic light emitting display apparatus's mechanical stability and longevity.
Implementation Method 1
a hard coating layer on lateral surfaces of the pillar, the plurality of protective units being elastically bendable and hard coating layers of neighboring protective units overlapping each other when the plurality of protective units are bent
Implementation Method 2
each of the plurality of protective units including a pillar protruding from the first surface of the base substrate perpendicularly to the first surface, and a hard coating layer on lateral surfaces of the pillar, the plurality of protective units being elastically bendable
Data Source
AI summary
A protective sheet, including a base substrate; and a plurality of protective units on a first surface of the base substrate and spaced apart from each other, each of the plurality of protective units including a pillar protruding from the first surface of the base substrate perpendicularly to the first surface, and a hard coating layer on lateral surfaces of the pillar, the plurality of protective units being elastically bendable and hard coating layers of neighboring protective units overlapping each other when the plurality of protective units are bent.