Siloxane Window Film Composition for Flexible Displays
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Solution Overview
Problem
Flexible window films require a balance of hardness, flexibility, and appearance while preventing curling, which existing technologies struggle to achieve effectively.
Innovation Solution
A composition for window films comprising a siloxane resin with specific epoxy group-containing compounds, crosslinking agents, and initiators, which improves hardness and flexibility while suppressing curling through controlled molecular weight and crosslinking ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a window film is made harder to improve scratch resistance and durability, then hardness is improved, but flexibility deteriorates making the film prone to cracking when folded
Solution Approach 1:
The patent changes the chemical composition parameters of the coating layer by incorporating siloxane resin with specific epoxy group-containing compounds (Formula 1) where x and y ratios are controlled. This chemical parameter modification enables the coating to achieve both high hardness (8H or higher) and flexibility simultaneously, resolving the contradiction between hardness and flexibility
Solution Approach 2:
The patent creates a composite coating layer combining siloxane resin with epoxy group-containing compounds, crosslinking agents, and initiators. This composite material structure provides both the hardness needed for scratch resistance and the flexibility required for foldable displays, eliminating the trade-off between these properties
2Strength
If the coating layer is made thicker to improve hardness and protection, then hardness is improved, but curling increases making the window film unstable
Solution Approach 1:
The patent modifies the chemical parameters of the coating composition by controlling the molecular weight and crosslinking density of the siloxane resin. This enables achieving high hardness with thinner coating layers (5-50 μm), thereby reducing the thickness-related curling issue while maintaining protective hardness
Solution Approach 2:
The patent creates a coating layer with optimized local chemical composition and crosslinking structure that achieves uniform hardness distribution. This localized optimization allows the coating to be both hard and thin, preventing curling while providing adequate protection
3Strength
If crosslinking density is increased to improve hardness, then hardness is improved, but flexibility and external appearance deteriorate due to excessive rigidity and potential cracking
Solution Approach 1:
The patent optimizes the crosslinking parameters by controlling the type and amount of crosslinking agents and the curing conditions. This parameter optimization achieves the right balance where the coating is hard enough for scratch resistance but remains flexible enough to follow substrate deformation without cracking, maintaining both hardness and reliability
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 composition achieves flexible window films with high pencil hardness, low curling, and excellent external appearance, suitable for flexible displays.
Implementation Method 1
a crosslinking agent
Implementation Method 2
a siloxane resin including a compound represented by Formula 1: (R1SiO3/2)x(R2R3SiO2/2)y (where in Formula 1, R1 is an epoxy group)
Implementation Method 3
an initiator
Data Source
AI summary
Provided are: a composition for a window film, containing a siloxane resin including chemical formula 1, a cross-linking agent, and an initiator; a flexible window film formed therefrom; and a flexible display device including the same.