Polyamide Film Surface Roughness for Optical-Mechanical Trade-off
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Solution Overview
Problem
Polyamide-based films used in display applications face a trade-off between optical and mechanical properties, where improving mechanical properties often compromises optical properties, necessitating a solution that enhances both simultaneously.
Innovation Solution
A polyamide-based film with specific 3D surface roughness characteristics, measured by a natural volume of 100 μm^3 to 2,800 μm^3, is developed, comprising a polyamide-based polymer, which is prepared by polymerizing a diamine compound, a dicarbonyl compound, and optionally a dianhydride compound, and then thermally treated, to achieve improved optical and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If mechanical properties are improved, then strength and flexibility are enhanced, but optical properties such as transparency and colorlessness deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the 3D surface roughness parameters (Sa, Sq, Sz, Sk, Sd) of the polyamide-based film within specific ranges. This control of surface topography parameters enables the film to achieve both improved mechanical properties (tensile strength, flexibility) and maintained optical properties (transparency, colorlessness), resolving the trade-off between strength and optical quality
Solution Approach 2:
The patent implements local quality by creating specific surface roughness characteristics (controlled peaks and valleys within defined volume and height ranges) while maintaining uniform bulk material properties. This localized surface modification allows the film to exhibit enhanced mechanical performance through controlled surface morphology without compromising the overall optical transparency of the material
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 film exhibits excellent solvent resistance, enhanced optical properties such as yellow index and transmittance, and improved slip and windability, while maintaining mechanical integrity, making it suitable for flexible and foldable display devices.
Implementation Method 1
casting the polymer solution onto a belt and drying it to prepare a gel sheet
Implementation Method 2
casting the polymer solution onto a belt and drying it to prepare a gel sheet
Implementation Method 3
thermally treating the gel sheet
Data Source
AI summary
The embodiments relate to a polyamide-based film that is excellent in solvent resistance and optical properties, to a process for preparing the same, and to a cover window and a display device comprising the same. The polyamide-based film comprises a polyamide-based polymer, wherein when the 3D surface roughness of a first side of the film is measured, the volume (natural volume) between the surface and a reference plane placed at the elevation of the highest peak parallel to the surface plane is 100 μm3 to 2,800 μm3.