Window Protective Film Structure for Foldable Display Impact Resistance
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Solution Overview
Problem
Existing flexible display devices face challenges in maintaining impact resistance while preserving folding characteristics and reducing overall thickness.
Innovation Solution
A window protective film with a shock absorbing layer made of acrylic resin, a base layer of polyethylene terephthalate, and a hard coating layer, which enhances impact resistance while maintaining a thin profile and preserving folding characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a thick protective film is used to improve impact resistance, then impact resistance is improved, but device thickness increases and folding characteristics deteriorate
Solution Approach 1:
The patent applies composite materials by combining three distinct layers with different properties: a shock absorbing layer (acrylic resin, 20-30 μm, low modulus 1-300 MPa) for impact absorption, a base layer (PET, higher modulus) for structural support, and a hard coating layer for surface protection. This composite structure achieves superior impact resistance while maintaining thin overall thickness (20-30 μm shock absorbing layer alone) and preserving folding characteristics of flexible display devices.
2Strength
If a thick protective film is used to improve impact resistance, then impact resistance is improved, but folding characteristics deteriorate
Solution Approach 1:
The composite structure enables the protective film to provide impact resistance while maintaining flexibility for folding. The shock absorbing layer's low modulus (1-300 MPa) and thin thickness (20-30 μm) allow it to flex with the display device during folding, while the layered composite structure provides the necessary impact protection.
3Strength
If a hard coating layer is added to improve impact resistance, then impact resistance is improved, but device complexity increases
Solution Approach 1:
The patent employs a three-layer composite structure (shock absorbing layer, base layer, hard coating layer) that provides comprehensive protection against impact while maintaining relatively simple manufacturing processes. Each layer serves a specific function, creating a synergistic effect that improves impact resistance without proportionally increasing device complexity.
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 improves impact resistance and maintains the flexibility of the display device, allowing for a slimmer design without compromising folding capabilities.
Implementation Method 1
a shock absorbing layer including an acrylic resin and having a modulus of about 300 MPa or less
Implementation Method 2
a shock absorbing layer including an acrylic resin and having a modulus of about 300 MPa or less
Data Source
AI summary
A window protective film includes: a shock absorbing layer including acrylic resin and having a modulus of about 300 MPa or less; a base layer located on the shock absorbing layer; and a hard coating layer located on the base layer.