Reflection Preventing Layered Product for LCD Polarizing Plates
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Solution Overview
Problem
Conventional reflection preventing films for electronic equipment fail to simultaneously achieve high transparency, mechanical strength, antistaticity, and effective reflection prevention, often compromising on one or more of these properties due to the addition of metal oxide fine particles which impair transparency and strength.
Innovation Solution
A reflection preventing layered product is created by sequentially laminating a high refractive index layer with conductive fine particles and an activated energy ray-curable or heat-curable resin on a transparent plastic film, paired with a low refractive index aerogel layer, ensuring a surface resistance of 1.0×10^10 ohm/square inch or less and total light transmittance of 94% or more, thereby enhancing transparency, mechanical strength, and reflection prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal oxide fine particles are added to provide antistatic characteristics, then antistaticity is improved, but transparency is impaired
Solution Approach 1:
The patent extracts the harmful metal oxide fine particles from the composition and replaces them with a surfactant-containing coating layer that provides antistatic functionality without compromising transparency. The surfactant forms a thin film that imparts antistatic properties while maintaining optical clarity.
Solution Approach 2:
The patent changes the chemical composition parameters by using surfactants with specific molecular structures (containing polar and nonpolar groups) that can provide antistatic properties through surface activity rather than through metal oxide particle conduction. This parameter change enables antistaticity without the transparency loss associated with metal oxide particles.
2Reliability
If metal oxide fine particles are added to provide antistatic characteristics, then antistaticity is improved, but mechanical strength is impaired
Solution Approach 1:
The patent removes metal oxide fine particles from the system and replaces their antistatic function with a surfactant-based mechanism. The surfactant forms a continuous or semi-continuous film that provides antistatic properties without creating the mechanical weak points that particle inclusions create in the polymer matrix.
Solution Approach 2:
The patent creates a composite coating structure where the surfactant molecules form an organized assembly at the polymer-air interface. This composite structure combines the polymer substrate with the surfactant film, achieving antistatic properties through the surfactant's amphiphilic nature while preserving the mechanical integrity of the base material.
3Object-affected harmful factors
If a reflection preventing layer is added to suppress external image reflection, then reflection prevention is improved, but device complexity is increased
Solution Approach 1:
The patent merges the reflection preventing function with the antistatic coating function into a single integrated layer. The surfactant-containing coating simultaneously provides both reflection prevention through its optical properties and antistatic characteristics through its electrical properties, eliminating the need for separate functional layers.
Solution Approach 2:
The surfactant coating layer is designed to perform multiple functions: it provides antistatic properties through its electrical conductivity, reflection prevention through its optical interference characteristics, and potentially hydrophobic properties. This multi-functional design simplifies the overall device structure by consolidating multiple required functions into one layer.
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 provides a polarizing plate with excellent reflection prevention, antistatic characteristics, and mechanical strength, suitable for liquid crystal displays, while maintaining high visibility and productivity.
Implementation Method 1
a reflection preventing layered product obtained by sequentially laminating a high refractive index layer and a low refractive index layer having a low refractive index of a certain range on a transparent plastic film
Implementation Method 2
a low refractive index layer having a low refractive index of a certain range... a refractive index of 1.25 to 1.37
Implementation Method 3
an activated energy ray-curable or heat-curable resin
Implementation Method 4
an activated energy ray-curable or heat-curable resin... heat-curable
Implementation Method 5
a high refractive index layer with conductive fine particles... a surface resistance of 1.0×10^10 ohm/square inch or less
Data Source
AI summary
A reflection preventing layered product is provided by laminating a high refractive index layer and a low refractive index layer, which has a refractive index lower than that of the high refractive index layer, in that order on a transparent plastic film, directly or through another layer. The low refractive index layer has a surface resistance of 1.0×1010 ohm/square inch or less, a total light remittance of 94% or more, and a refractive index of 1.25-1.37. An optical member provided with the reflection preventing layered product is also provided. This optical member is preferably a polarizing plate with reflection preventing function used for a liquid crystal display. The reflection preventing layered product excels in transparency, mechanical strength, antistaticity, and reflection preventing characteristics.