Multi-Layer Protective Window for Displays
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Solution Overview
Problem
Existing display devices face challenges with protective windows that are heavy and thick due to the use of tempered glass, which also limits their ability to be formed into various shapes, and require a material with strong resistance against external impacts.
Innovation Solution
A display device with a protective window composed of multiple transparent members, including a polycarbonate first transparent member, a polyethylene terephthalate or polyethylene naphthalate second transparent member, and a silsesquioxane third transparent member, which are pre-treated and formed using a vacuum process to create a lightweight yet impact-resistant structure with both flat and curved surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If tempered glass is used as the protective window material, then the resistance against external impact is improved, but the weight and thickness of the display panel increase
Solution Approach 1:
The protective window is divided into multiple functional layers: a polycarbonate base layer for impact resistance, a PET/PEN intermediate layer for structural support, and a silsesquoxane hard coating layer for surface hardness. This segmentation allows each layer to contribute specific properties, achieving high impact resistance without requiring thick tempered glass
Solution Approach 2:
The patent uses composite material structure combining polycarbonate, PET/PEN, and silsesquoxane in a multi-layer configuration. This composite approach provides the benefits of each material: polycarbonate for toughness and impact resistance, PET/PEN for dimensional stability, and silsesquoxane for surface hardness, while maintaining lightweight properties
2Strength
If tempered glass is used as the protective window material, then the resistance against external impact is improved, but the ability to form various shapes deteriorates
Solution Approach 1:
The protective window is divided into multiple functional layers: a polycarbonate base layer for impact resistance, a PET/PEN intermediate layer for structural support, and a silsesquoxane hard coating layer for surface hardness. This segmentation allows each layer to contribute specific properties, achieving high impact resistance without requiring thick tempered glass
Solution Approach 2:
The patent employs pre-treatment processes including heating to specific temperature ranges (e.g., 80-120°C for PET, 100-150°C for PEN) and vacuum forming to transform the physical state and shape of the protective window layers. These parameter changes enable the material to be formed into curved surfaces and various shapes while maintaining its impact resistance properties
3Weight of moving object
If the protective window is made thinner to reduce weight, then the weight is reduced, but the impact resistance deteriorates
Solution Approach 1:
The patent uses composite material structure combining polycarbonate, PET/PEN, and silsesquoxane in a multi-layer configuration. This composite approach provides the benefits of each material: polycarbonate for toughness and impact resistance, PET/PEN for dimensional stability, and silsesquoxane for surface hardness, while maintaining lightweight properties
Solution Approach 2:
The protective window is divided into multiple functional layers: a polycarbonate base layer for impact resistance, a PET/PEN intermediate layer for structural support, and a silsesquoxane hard coating layer for surface hardness. This segmentation allows each layer to contribute specific properties, achieving high impact resistance without requiring thick tempered glass
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 provides a lightweight, impact-resistant protective window that can be formed into various shapes, enhancing the display area while maintaining strength and durability, without the weight and thickness issues associated with tempered glass.
Implementation Method 1
The high hardness film is heated, and the high hardness film is mounted on a jig
Implementation Method 2
The pre-treating may be performed in a vacuum state
Implementation Method 3
The transparent member is formed on a surface of the pre-window through an injection process
Implementation Method 4
A contact film is heated, and the high hardness film is mounted on the jig and contacts the contact film
Data Source
AI summary
A display device includes preparing a high hardness film. In the high hardness film, a first supporting member, a silsesquioxane film, and a second supporting member are deposited. The high hardness film is pre-treated, forming a pre-window. A transparent member is formed on a surface of the pre-window through an injection process. The transparent member is formed of polycarbonate. The first supporting member and the second supporting member are formed of polyethylene terephthalate or polyethylene naphthalate.