Antireflection Film Scratch Resistance via Localized Polymerization
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Solution Overview
Problem
Existing antireflection films for display devices face challenges in achieving both low reflectance and high scratch resistance, as measures to reduce reflectance often compromise film strength and adhesion.
Innovation Solution
An antireflection film with a low refractive index layer containing a binder polymer, a polymerization initiator, and an ethylenically unsaturated group-containing hardenable compound, where the polymerization initiator and hardenable compound are localized in the lower part of the layer, and an inorganic filler such as silica particles are used to enhance scratch resistance without increasing the refractive index.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If measures such as introduction of fluorine atom or decrease of density are taken to decrease the refractive index of a layer, then the reflectance is reduced, but the film strength and adhesion are deteriorated so that the scar resistance is lowered
Solution Approach 1:
The invention uses a composite material system combining a fluorine-containing polymer (for low refractive index) with an inorganic filler (silica particles, for strength) and a silane coupling agent (for adhesion). This composite approach allows the low refractive index layer to simultaneously achieve low reflectance, high film strength, and good adhesion to the lower layer, resolving the contradiction between optical performance and mechanical properties.
Solution Approach 2:
The invention introduces a silane coupling agent that locally enhances the interface between the low refractive index layer and the lower layer. The coupling agent creates a transition zone with improved bonding characteristics, providing localized adhesion enhancement without affecting the overall low refractive index property of the layer.
2Strength
If an inorganic filler is introduced in a low refractive index layer to increase the film strength, then the film strength is improved, but it becomes difficult to obtain adhesion to a lower layer and the scar resistance is not sufficient
Solution Approach 1:
The silane coupling agent acts as an intermediary substance between the inorganic filler particles and the lower layer. It forms chemical bonds with both the inorganic filler surface and the polymer matrix, creating a bridging layer that transfers stress effectively and prevents delamination, thereby solving the adhesion problem while maintaining film strength.
Solution Approach 2:
The invention creates a tri-component composite system: inorganic filler for strength, silane coupling agent for adhesion, and fluorine-containing polymer for low refractive index. This multi-phase composite structure allows each component to fulfill its specific function while working synergistically to achieve both strong adhesion and high film strength.
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 provides an antireflection film with improved scratch resistance and antireflection performance, ensuring high productivity and visibility in display devices while maintaining low reflectance.
Implementation Method 1
a low refractive index layer which is formed with a composition for forming a low refractive index layer containing a binder polymer, at least one polymerization initiator and an ethylenically unsaturated group-containing hardenable compound
Implementation Method 2
for the purpose of preventing a lowering of contrast or reflection of an image due to the reflection of external light, an antireflection film is arranged on the outermost surface of a display device so as to reduce a reflectance by using a principle of optical interference
Data Source
AI summary
An antireflection film comprising a transparent support, a hard coat layer and a low refractive index layer, wherein the low refractive index layer is formed with a composition containing a binder polymer, a polymerization initiator and an ethylenically unsaturated group-containing hardenable compound.