Foldable Display Protective Film Coating for Strength and Low Reflectance
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Solution Overview
Problem
Existing foldable display devices face challenges in achieving high mechanical strength and minimizing external light reflection, while also maintaining stability and reliability during use.
Innovation Solution
A method for manufacturing a display device involves forming a base layer on a lower protective film, followed by a hard coating layer and a refractive layer with a refractive index of less than or equal to 1.4. The upper protective film, including these layers, is then cut using a laser, which enhances elastic strain and reduces reflectance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a hard coating layer is formed on the protective film to increase mechanical strength, then the hardness and scratch resistance are improved, but the elastic strain capability is reduced
Solution Approach 1:
The patent applies composite materials by forming a hard coating layer (first coating layer) on the protective film and then depositing a refractive layer (second coating layer) containing fluorine-containing organic compounds on top. This composite structure combines the mechanical strength benefits of the hard coating with the elastic strain capability and low reflectance properties of the fluorine-containing organic layer, resolving the contradiction between hardness and flexibility.
2Ease of manufacture
If the protective film is cut with a knife to separate layers, then the separation is achieved, but the elastic strain value is reduced
Solution Approach 1:
The patent replaces the mechanical cutting method (knife cutting) with laser cutting to separate the protective film from the lower protective film. Laser cutting achieves clean separation without mechanically damaging the elastic properties of the protective film, thereby maintaining high elastic strain values while still enabling layer separation for manufacturing.
3Object-affected harmful factors
If conventional optical films are used to minimize external light reflection, then the reflectance is reduced, but the mechanical strength is insufficient for foldable displays
Solution Approach 1:
The patent creates a composite optical coating system where a hard coating layer provides mechanical strength and scratch resistance, while a refractive layer containing fluorine-containing organic compounds (such as dodecafluoroheptyl acrylate) provides low reflectance properties. The refractive layer has a refractive index of less than or equal to 1.4, which minimizes external light reflection, while the underlying hard coating ensures sufficient mechanical strength for foldable display applications.
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 proposed method improves the mechanical strength and reduces reflectance of foldable display devices, enhancing user experience by providing stability and reliability when the device is in use.
Implementation Method 1
cutting an upper protective film including the base layer, the hard coating layer, and the refractive layer and the lower protective film with a laser
Implementation Method 2
forming a refractive layer having a refractive index of less than or equal to about 1.4 on the hard coating layer
Implementation Method 3
the refractive layer may be formed by a vacuum deposition
Data Source
AI summary
A method of manufacturing a display device includes forming a base layer on a lower protective film, forming a hard coating layer on the base layer, forming a refractive layer having a refractive index of less than or equal to about 1.4 on the hard coating layer, and cutting an upper protective film including the base layer, the hard coating layer, and the refractive layer and the lower protective film with a laser.