Hard Coating Composition for Flexible Display Window Members
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Solution Overview
Problem
Flexible display devices require window members with both high surface hardness and flexibility to withstand bending and impact, which existing materials struggle to achieve effectively.
Innovation Solution
A hard coating composition comprising a mixture of silsesquioxane, siloxane compounds, and surface-treated inorganic particles, along with photoinitiators and polyfunctional acrylate compounds, is used to form a hard coating layer on a plastic substrate, providing enhanced surface hardness and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a hard coating layer is formed to increase surface hardness, then surface hardness is improved, but flexibility deteriorates
Solution Approach 1:
The patent applies composite materials by combining organic polymers (acrylate compounds, urethane acrylate oligomers) with inorganic particles (silica, alumina, zirconia, titania) to create a hard coating layer that achieves both high surface hardness and flexibility. The composite structure allows the inorganic particles to provide hardness while the organic matrix maintains flexibility and adhesion.
Solution Approach 2:
The patent utilizes parameter changes by controlling the molecular weight, functional group content, and composition ratios of the polymer components. By adjusting these parameters, the coating achieves optimal balance between hardness and flexibility. The photopolymerization process also transforms the material from liquid to solid state, changing its physical properties.
2Reliability
If surface hardness is increased to resist impact, then impact resistance is improved, but bending properties deteriorate
Solution Approach 1:
The composite structure with inorganic particles dispersed in a flexible polymer matrix provides impact resistance through energy absorption by the particles while the polymer matrix accommodates bending deformations. This composite approach allows simultaneous achievement of high impact resistance and good bending properties.
Solution Approach 2:
The patent employs a thin film structure for the hard coating layer that inherently provides flexibility. The thin film can bend and deform without cracking, maintaining both impact resistance and bending properties. The film structure allows the coating to conform to curved surfaces and withstand flexible display device deformations.
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 resulting window member exhibits improved surface hardness, flexibility, and impact resistance, maintaining reliability even under bending and high-temperature conditions.
Implementation Method 1
the siloxane compound may have at least one acrylate functional group
Implementation Method 2
a polymer derived from a mixture including a silsesquioxane, a siloxane compound, and inorganic particles which are surface treated with silane
Data Source
AI summary
A hard coating composition according to an embodiment includes a polymer derived from a mixture including a silsesquioxane, a siloxane compound, and inorganic particles which are surface treated with silane. A hard coating layer having high surface hardness and impact resistance, and at the same time, excellent bending properties may be provided.