Patterned Protective Layers for Flexible Display Impact Resistance
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Solution Overview
Problem
Flexible display apparatuses are vulnerable to damage from external impacts and suffer from deteriorating surface quality when folded or rolled due to internal configuration issues.
Innovation Solution
A display apparatus with improved impact resistance and surface quality, featuring a display panel with a first and second pattern layer, where each pattern layer has a closed line shape with openings, and a negative Poisson's ratio, enhancing deformation resistance and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the flexible display apparatus is made more flexible to be easily folded or rolled, then the ease of operation is improved, but the impact resistance deteriorates
Solution Approach 1:
The protective member is divided into multiple pattern layers (first pattern layer and second pattern layer) with resin layers in between. Each layer contains patterns with openings that are displaced from each other, creating a segmented structure that provides both flexibility and impact resistance through the distributed architecture of multiple layers.
Solution Approach 2:
The pattern layers are arranged in the thickness direction (vertical dimension) of the display panel, with openings displaced in the planar direction. This three-dimensional arrangement allows the structure to maintain flexibility in the planar direction while providing impact resistance through the stacked layers in the thickness direction.
2Ease of operation
If the flexible display apparatus is folded or rolled, then the ease of operation is improved, but the surface quality deteriorates
Solution Approach 1:
The protective member is segmented into multiple pattern layers with resin layers between them. This segmentation allows each layer to deform independently during folding or rolling, preventing the accumulation of stress that would otherwise cause surface deterioration while maintaining overall structural integrity.
Solution Approach 2:
The resin layers positioned between the first and second pattern layers act as intermediaries that allow relative movement and deformation between the rigid pattern layers. This intermediary structure enables the display apparatus to be folded or rolled without transferring excessive stress to the surface, thereby preventing surface quality deterioration.
3Strength
If multiple pattern layers are added to improve impact resistance, then the strength is improved, but the device complexity increases
Solution Approach 1:
The protective member is segmented into multiple pattern layers with resin layers between them. This segmentation allows each layer to be relatively simple in structure while the combined multi-layer system provides enhanced impact resistance, distributing the protective function across multiple simpler components rather than requiring one complex thick layer.
Solution Approach 2:
Each pattern layer is implemented as a thin film structure with patterns and openings, allowing the layers to be lightweight and flexible. The multiple thin film layers collectively provide impact resistance without adding significant complexity, as each layer follows a similar simple patterned film design rather than requiring fundamentally different structural approaches.
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 solution effectively enhances the impact resistance and maintains the flexibility of the display apparatus, preventing surface damage and maintaining image quality even when rolled or folded.
Implementation Method 1
each of the first pattern layer and the second pattern layer may have a deformation rate which is smaller in a direction perpendicular to a tensile direction than in the tensile direction... each of the first pattern layer and the second pattern layer may have a negative Poisson's ratio
Data Source
AI summary
A display apparatus includes: a display panel; a first pattern layer on one surface of the display panel; and a second pattern layer facing the one surface with the first pattern layer interposed therebetween, wherein: the first pattern layer comprises a plurality of first patterns each having a closed line shape comprising a first opening; the second pattern layer comprises a plurality of second patterns each having a closed line shape comprising a second opening; on the one surface, each of the first pattern layer and the second pattern layer has a deformation rate which is smaller in a direction perpendicular to a tensile direction than in the tensile direction; and on the one surface, the first openings overlap portions of the second patterns.