Antireflection Laminate with Hollow and Solid Particles
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Solution Overview
Problem
The incorporation of non-porous inorganic compound particles in refractive index layers for enhancing hardness results in decreased abrasion resistance and antireflection performance due to increased refractive index, leading to poor image visibility in display devices.
Innovation Solution
An antireflection laminate with a refractive index layer comprising a combination of crosslinkable hollow and solid particles, where the hollow particles have a porous interior and a surface modified with crosslinkable groups, and the solid particles have no voids, enhancing abrasion resistance and maintaining a low refractive index of 1.45 or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If non-porous inorganic compound particles are incorporated in the refractive index layer to enhance hardness, then the strength of the layer increases, but the abrasion resistance deteriorates and the refractive index increases
Solution Approach 1:
The patent uses porous inorganic compound particles instead of non-porous particles. The porous structure reduces the refractive index of the layer while the inorganic material provides strength. The pores contain air or vacuum which has lower refractive index than solid material, thereby maintaining low overall refractive index while providing mechanical strength through the inorganic particle framework.
Solution Approach 2:
The patent creates a composite refractive index layer combining organic binder components with inorganic compound particles. This composite structure allows the inorganic particles to provide strength and the organic binder to provide cohesion and uniform distribution, achieving both strength and abrasion resistance simultaneously.
2Strength
If non-porous inorganic compound particles are incorporated to increase layer strength, then pressure resistance improves, but antireflection performance decreases due to increased refractive index
Solution Approach 1:
The porous structure of the inorganic particles creates air-filled voids that reduce the average refractive index of the layer. The inorganic particle walls provide mechanical strength and pressure resistance, while the air-filled pores reduce optical density, thereby maintaining antireflection performance.
Solution Approach 2:
The patent applies different properties to different parts of the particle structure: the solid inorganic walls provide strength and pressure resistance, while the internal pores provide low refractive index. This local differentiation of properties allows simultaneous achievement of mechanical strength and optical performance.
3Stability of the object's composition
If porous fine particles are used in the refractive index layer, then affinity with organic binder improves, but the layer becomes non-uniform with aggregated particles
Solution Approach 1:
The patent modifies the surface properties of inorganic particles by introducing surface treatment or functional groups that enhance compatibility with organic binder components. This parameter change in surface chemistry improves wetting and adhesion, preventing particle aggregation and ensuring uniform distribution throughout the layer.
Solution Approach 2:
The patent uses surface treatment agents or coupling agents as intermediaries between the inorganic particles and organic binder. These intermediaries improve the interfacial compatibility and adhesion, ensuring uniform distribution of particles while maintaining the desired mechanical properties of the layer.
Data Source
AI summary
An antireflection laminate for use mainly in displays such as LCDs and PDPs, which has a refractive index layer that has, while comprising hollow and solid particles, excellent abrasion resistance, a refractive index of 1.45 or less, and low reflectivity is disclosed. The refractive index layer is obtained by irradiating a refractive index layer forming composition with ionizing radiation, the composition including an ionizing radiation curable resin, a crosslinkable hollow particle having an inside that is porous or hollow and is covered with an outer shell layer and having a surface that is modified with a crosslinkable group(s), and a crosslinkable solid particle having an inside that is neither porous nor hollow and having a surface that is modified with a crosslinkable group(s). The crosslinkable groups comprise an ionizing radiation curable group each and have an identical structure or a very similar structure.