Resin Composition for Microlenses with High Refractive Index
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Solution Overview
Problem
Conventional resin compositions for microlenses have limitations in achieving high refractive index, transparency, and heat resistance, with issues related to long-term storage stability and the need for balancing refractive index and dispersion stability in nano-composite materials, as well as challenges in accurately transferring lens patterns during the etch back method.
Innovation Solution
A resin composition comprising a polymer with a specific structural unit, a cross-linking agent, and a solvent, which forms a cured film with a refractive index of 1.68 or higher, high transparency, and heat resistance, and has a dry etching rate equivalent to photoresist, enabling the production of microlenses with improved optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional resin compositions are used for microlenses, then manufacturing process is simple, but refractive index is low (approximately 1.50)
Solution Approach 1:
The patent uses a composite material system consisting of diethylene glycol bis(allyl carbonate) polymer matrix combined with inorganic oxide fine particles (such as TiO2, ZrO2, or SiO2) to achieve a refractive index of 1.60 or higher while maintaining ease of manufacture through conventional casting molding processes
Solution Approach 2:
The patent changes the chemical composition parameters by introducing specific inorganic oxide fine particles with high refractive indices into the polymer matrix, thereby increasing the overall refractive index of the cured film from 1.50 to 1.60 or higher without fundamentally changing the manufacturing process
2Illumination intensity
If inorganic oxide fine particles are added to increase refractive index, then refractive index increases (above 1.80), but long term storage stability deteriorates and dispersion stability requires large amount of stabilizer
Solution Approach 1:
The patent optimizes the particle size parameter of inorganic oxide fine particles to 0.1 μm or less, and controls the concentration at 1-50 parts by mass per 100 parts by mass of polymer, achieving a refractive index of 1.60 or higher while maintaining excellent long-term storage stability without requiring large amounts of dispersion stabilizers
Solution Approach 2:
The patent applies local quality by using uniformly dispersed fine particles throughout the polymer matrix, ensuring consistent optical properties and stability throughout the material volume
3Manufacturing precision
If lens pattern transfer accuracy is improved in etch back method, then manufacturing precision increases, but requires matching dry etching rates of resist and resin layer
Solution Approach 1:
The patent modifies the chemical composition of the resin layer to achieve a dry etching rate that closely matches that of conventional photoresist materials, simplifying the etch back process by eliminating the need for complex etching rate matching while maintaining high lens pattern transfer accuracy
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 resin composition effectively achieves a high refractive index, excellent transparency, and heat resistance, ensuring accurate lens pattern transfer and improved performance in microlens applications, while maintaining stability and efficiency in the etch back method.
Implementation Method 1
X is a divalent organic group having at least one aromatic ring or heterocyclic ring... capable of forming a cured film having high transparency and a high refractive index
Implementation Method 2
a resin composition comprising the polymer, a cross-linking agent, and a solvent... Heat Solid
Data Source
AI summary
A resin composition capable of forming a cured film having a high refractive index, high transparency and high heat resistance, and a polymer which is used for the resin composition. A polymer having a structural unit of Formula (1):wherein A1 and A2 are each independently an —O— group or a —C(═O)O— group; X is a divalent organic group having at least one aromatic ring or heterocyclic ring, wherein, when the X has two or more aromatic rings or heterocyclic rings, the rings are optionally bonded to each other via a single bond, are optionally bonded to each other via a heteroatom, or optionally form a condensed ring; and Y is a divalent organic group having at least one aromatic ring or condensed ring. A resin composition, includes: the polymer; a cross-linking agent; and a solvent.