Antireflection Coating Composition Single Layer Merging
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Solution Overview
Problem
Existing antireflection technologies face challenges in achieving effective abrasion resistance and cost-efficient manufacturing, particularly when applied to high-resolution displays, as they often require multi-coating methods that increase costs and can distort images due to diffused reflection or require uniform ultrafine particles that are difficult to achieve with general coating processes.
Innovation Solution
A coating composition comprising a low refractive material (1.2-1.45) and high refractive material (1.55-2.2) with a concentration gradient in a single coating layer, using alkoxysilane reactants and high refractive fine particles like TiO2 or ITO, which phase separate to form a multi-layer structure for antireflection, reducing manufacturing costs and maintaining image sharpness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a multi-coating design is used to achieve destructive interference for antireflection, then reflectance is reduced below 3%, but manufacturing cost increases and the process becomes more complex
Solution Approach 1:
The patent combines multiple coating layers into a single coating layer by incorporating both low refractive index materials (1.3-1.5) and high refractive index materials (1.6-2.0) with fine particles into one coating composition. This single layer produces both the hard coating effect and the antireflection effect through destructive interference, eliminating the need for separate multi-coating processes while maintaining reflectance below 3%.
Solution Approach 2:
The patent uses composite materials consisting of a binder resin mixed with both low refractive index components (such as fluorinated compounds) and high refractive index components (such as TiO2 or SiO2 fine particles). This composite structure within a single coating layer enables simultaneous achievement of hardness, adhesion, and antireflection properties without requiring multiple separate coatings.
2Strength
If a hard coating layer is added below the antireflection coating layer to improve abrasion resistance, then abrasion resistance is improved, but the total number of coating layers increases to 2-3 layers
Solution Approach 1:
The patent merges the functions of the hard coating layer and the antireflection coating layer into a single integrated coating layer. The coating composition includes binder resin for adhesion, low refractive index materials for antireflection, and high refractive index fine particles for both optical performance and mechanical strength. This single layer simultaneously provides the hardness needed for abrasion resistance and the refractive index gradient needed for antireflection, reducing the structure from 2-3 layers to just one layer.
3Object-affected harmful factors
If ultrafine particles are used to create a gradient refractive index structure, then antireflection characteristic is achieved, but uniform distribution is difficult to achieve with general coating processes
Solution Approach 1:
The patent controls the particle size of the fine particles to be within a specific range (0.1-10 μm, preferably 0.5-5 μm) and adjusts the refractive index of the binder resin and dispersed particles to create an appropriate gradient. By optimizing these parameters, the coating composition achieves self-leveling during the coating process, allowing uniform distribution of particles without requiring special coating equipment or complex process control, thus achieving both antireflection characteristics and manufacturing feasibility.
4Object-affected harmful factors
If the coating thickness is reduced to smaller than the diameter of fine particles, then antireflection effect is improved, but abrasion resistance deteriorates
Solution Approach 1:
The patent uses composite materials where high refractive index fine particles (such as TiO2, SiO2, or ZrO2) are dispersed in a binder resin matrix. The fine particles provide the refractive index contrast needed for antireflection, while the binder resin provides mechanical strength and adhesion. This composite structure allows the coating to maintain both optical performance and mechanical durability even at reduced thickness, as the particles and resin work together synergistically rather than requiring the coating to be thinner than the particle diameter.
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 achieves excellent optical characteristics with reduced manufacturing costs, providing antireflection without image distortion and improved abrasion resistance through a single coating process, with reflectance below 3% and transmittance above 96%, while maintaining a thickness of 1 micrometer or less.
Implementation Method 1
wherein the low refractive material is a low refractive thermosetting material and includes an alkoxysilane reactant causing a sol-gel reaction
Implementation Method 2
b) a high refractive material having a refractive index of 1.55 to 2.2 and comprising high refractive fine particles and an organic substituent, wherein the difference in the surface energy between two materials is 5 mN/m or more
Implementation Method 3
phase separation of ingredients occurs on a single coating layer that is formed by one coating process, and thus a multi-layer structure is formed
Implementation Method 4
wherein the organic substituent is a thermosetting organic substituent selected from the group consisting of a silane reactant or a UV curable organic substituent selected from two or more functional acrylate monomer and oligomer
Data Source
AI summary
The present invention provides a coating composition for antiref lection that includes a) a low refractive material having a refractive index of 1.2 to 1.45, b) a high refractive material having a refractive index of 1.55 to 2.2 and comprising high refractive fine particles and an organic substituent, in which the difference in the surface energy between two materials is 5 mN/m or more; an antiref lection film manufactured using the coating composition for antiref lection; and a method of manufacturing the antiref lection film. According to the present invention, the antiref lection film having excellent antiref lection characteristic can be manufactured by one coating process, thereby reducing manufacturing cost.