Silazane Coating for Polyimide Cover Window Hardness and Clarity
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Solution Overview
Problem
Existing polyimide-based films for flexible display apparatuses do not adequately meet the optical and mechanical properties required for cover windows, necessitating improvements in hardness, moisture permeability, and chemical resistance.
Innovation Solution
A silazane-based compound is used to form a coating composition that enhances the properties of a light-transmitting film, including a support layer and a first coating layer with specific molecular structures and thickness, and optionally a second coating layer, to improve adhesion, optical properties, and chemical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyimide-based film is used for cover window, then hardness is improved, but optical properties and mechanical properties do not satisfy requirements
Solution Approach 1:
The patent uses a silazane-based compound as a coating material applied over the polyimide-based film. This creates a composite structure where the polyimide provides hardness and the silazane coating improves optical properties, moisture permeability, and chemical resistance. The coating composition includes the silazane-based compound and a solvent, forming a multi-layer composite material system that integrates the advantages of both components.
2Strength
If polyimide-based film is used for cover window, then hardness is improved, but moisture permeability and chemical resistance are insufficient
Solution Approach 1:
The silazane-based compound undergoes chemical transformation when exposed to moisture, forming a crosslinked gel structure. This parameter change from monomeric to polymeric structure creates a barrier that reduces moisture permeability. The compound's chemical structure includes silazane groups that react with water to form a protective network, fundamentally changing the material's permeability characteristics.
3Reliability
If coating layer is added to improve physical properties, then adhesion and optical properties are improved, but manufacturing complexity increases
Solution Approach 1:
The silazane-based compound performs multiple functions simultaneously: it improves adhesion between layers, enhances optical properties, provides moisture barrier, and offers chemical resistance. The compound's molecular structure includes functional groups that automatically react with moisture in the environment, creating a self-healing protective layer without requiring additional processing steps or complex manufacturing procedures.
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 silazane-based compound improves the adhesion and optical properties of polyimide-based films, enhancing their chemical resistance, flexibility, and moisture-barrier properties, while maintaining high light transmittance and reducing the yellow index.
Implementation Method 1
a first coating layer on the support layer, wherein the first coating layer includes a cured product of a silazane-based compound
Implementation Method 2
improve the adhesion and optical properties of polyimide-based films, enhancing their chemical resistance, flexibility, and moisture-barrier properties
Data Source
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AI summary
Disclosed are a silazane-based compound represented by Formula 1, a coating composition containing the silazane-based compound, a light-transmitting film including a first coating layer containing the silazane-based compound, and a display apparatus including the light-transmitting film.