Flexible Display Window Silica Nano Particle Coating Impact Resistance

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Solution Overview

Problem

Flexible displays made of plastic-based materials are vulnerable to external impacts, leading to scratches and cracks, and hard coating layers used for impact resistance increase reflectivity.

Innovation Solution

A flexible display window with a coating structure comprising a first silica nano particle coating layer of full-type silica nano particles and a second silica nano particle coating layer of hollow-type silica nano particles, stacked with a flexible hard coating layer and base layer interposed between them, to enhance impact resistance while reducing reflectivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a hard coating layer is added to enhance impact-resistance, then the impact-resistance is improved, but the reflectivity increases

Engineering Contradiction:

Improveimpact-resistanceVSAvoidreflectivity

Core Design Contradiction:

StrengthVSObject-generated harmful factors

Solution Approach 1:

The patent applies different types of silica nano particles at different locations within the coating layer. Full-type silica nano particles are positioned in the lower portion to provide impact resistance, while hollow-type silica nano particles are positioned in the upper portion to reduce reflectivity. This spatial differentiation of particle types enables simultaneous achievement of both impact resistance and low reflectivity in different regions of the same coating layer.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The coating layer is formulated as a composite material containing both full-type silica nano particles and hollow-type silica nano particles dispersed within a binder resin. This composite structure combines the high hardness and impact resistance properties of full-type particles with the light-scattering and anti-reflective properties of hollow-type particles, achieving both improved impact resistance and reduced reflectivity through material composition rather than separate layers.

Inventive Principle:

Principle #40Composite materials

2Adaptability or versatility

If components are made of plastic-based materials to enhance flexibility, then the flexibility is improved, but the vulnerability to external impacts increases

Engineering Contradiction:

ImproveflexibilityVSAvoidimpact-resistance

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The patent employs a flexible display window with a plastic-based flexible substrate that maintains bendability and flexibility. To compensate for the reduced impact resistance of plastic materials, a multi-layer coating structure is applied on the flexible substrate, incorporating silica nano particles that provide enhanced mechanical strength and impact resistance while preserving the underlying flexibility of the plastic-based components.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The patent creates a composite structure by combining plastic-based flexible materials with silica nano particle-containing coating layers. The flexible substrate provides adaptability and flexibility, while the silica nano particle coating layers provide enhanced strength and impact resistance, achieving a synergistic combination where the composite material system overcomes the weaknesses of individual materials.

Inventive Principle:

Principle #40Composite materials

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 effectively disperses external impacts and reduces reflectivity, providing enhanced impact resistance and low reflectivity for flexible displays.

Implementation Method 1

the first and second silica nano particle coating layers are disposed over a flexible base layer... the flexible display window enhances impact-resistance of the flexible display while reducing reflectivity of the flexible display based on the first silica nano particle coating layer including the full-type silica nano particles and the second silica nano particle coating layer including the hollow-type silica nano particles

Methodology Applied

Scientific EffectImpact dispersion:

Implementation Method 2

the first silica nano particle coating layer including full-type silica nano particles and a second silica nano particle coating layer including hollow-type silica nano particles... reducing reflectivity of the flexible display

Methodology Applied

Scientific EffectLight scattering: Scattering

Data Source

PatentEP3438787B1Flexible display window and flexible display including the same

Publication Date: 2021.12.22 SAMSUNG DISPLAY CO LTD

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AI summary

A flexible display window includes a flexible base layer including a flexible resin, a first silica nano particle coating layer including full-type silica nano particles, where the first silica nano particle coating layer is disposed on the flexible base layer, a flexible hard coating layer including a flexible hard coating resin, where the flexible hard coating layer is disposed on the first silica nano particle coating layer, and a second silica nano particle coating layer including hollow-type silica nano particles, where the second silica nano particle coating layer is disposed on the flexible hard coating layer. Thus, the flexible display window can enhance impact-resistance of a flexible display while reducing reflectivity of the flexible display.