Cover Window Dual Coating Layer Design for Impact Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional cover windows for display devices, particularly made of plastic, face challenges in providing adequate protection against external impacts and scratches due to their flexibility and vulnerability.
Innovation Solution
A cover window design featuring a base layer with a first and second coating layer, where the first coating layer directly contacts a part of the base layer and exposes another part, and the second coating layer contacts the exposed area, enhancing impact resistance and scratch protection through specific material compositions and processing methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single coating layer is formed on the plastic base layer, then the manufacturing process is simple, but the scratch resistance and impact resistance are insufficient
Solution Approach 1:
The coating layer is divided into two distinct layers: a first coating layer (hard coating) applied to the plastic base layer for scratch resistance, and a second coating layer (siloxane-based coating) applied over it for enhanced impact resistance and chemical stability. This segmentation allows each layer to perform its specific function optimally without compromising the other.
Solution Approach 2:
The patent uses composite material structure by combining different coating materials with complementary properties. The first coating layer uses hard coating materials for scratch resistance, while the second coating layer uses siloxane-based materials for impact resistance and chemical stability, creating a composite protective system that leverages the strengths of each material.
2Strength
If the coating layer is made thin to maintain flexibility, then the flexibility is preserved, but the protection against impacts and scratches is reduced
Solution Approach 1:
The patent applies different coating materials with specific properties to different functional requirements: the first coating layer provides hard protection for scratch resistance, while the second siloxane-based coating layer provides impact resistance and chemical stability. This local quality approach ensures that each area of the coating system is optimized for its specific protective function while maintaining overall flexibility.
3Strength
If a hard coating layer is formed to increase strength, then the scratch resistance improves, but the peeling resistance and adhesion may deteriorate
Solution Approach 1:
The patent uses composite material structure by combining different coating materials with complementary properties. The first coating layer uses hard coating materials for scratch resistance, while the second siloxane-based coating layer provides improved adhesion and peeling resistance, creating a composite protective system that leverages the strengths of each material.
Solution Approach 2:
The first coating layer acts as an intermediary between the plastic base layer and the second coating layer. It provides a transition interface that ensures good adhesion of the second coating layer to the base layer while maintaining the scratch resistance provided by the hard coating material.
Data Source
AI summary
A cover window includes a base layer; a first coating layer on the base layer; and a second coating layer on the first coating layer. The first coating layer directly contacts a first part of an upper surface of the base layer and exposes a second part of the upper surface of the base layer, the upper surface of the base layer consists of the first part and the second part, and the second coating layer directly contacts the second part of the upper surface of the base layer exposed by the first coating layer, and an upper surface of the first coating layer.