Optical Layered Body Gradient Silica Distribution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional optical layered bodies face challenges in achieving sufficient antifouling properties and adhesion between layers due to the bleed-out of antifouling agents and reduced transparency, especially when a large amount is added, and difficulties in forming additional optically functional layers that enhance abrasion resistance.
Innovation Solution
An optical layered body with a hard coat layer containing reactive irregularly shaped silica fine particles unevenly distributed across three regions of the substrate, providing high hardness and allowing for excellent adhesion with a low refractive index layer, even with a small amount of antifouling agent, while preventing interference fringes by matching the refractive index gradient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large amount of antifouling agent is added to the hard coat layer, then antifouling properties are improved, but transparency is reduced and bleed out occurs
Solution Approach 1:
The patent applies local quality by creating a gradient distribution of silica fine particles within the hard coat layer. The particle concentration is highest at the lower surface (adjacent to the light-transmitting substrate) and decreases toward the upper surface. This localized concentration strategy allows the antifouling agent to be effectively positioned where it provides maximum benefit while minimizing its presence in regions where it would cause transparency reduction and bleed-out, thus resolving the contradiction between antifouling performance and optical clarity.
Solution Approach 2:
The patent employs parameter changes by controlling the refractive index distribution through the gradient particle concentration. The silica fine particles have a refractive index lower than the binder resin, creating a refractive index gradient that matches the optical properties of the light-transmitting substrate. This parameter optimization allows sufficient antifouling agent incorporation while maintaining transparency by preventing optical interference and reducing visible particle effects.
2Reliability
If an optically functional layer is laminated on the hard coat layer, then optical properties are improved, but adhesion between layers is insufficient
Solution Approach 1:
The patent applies local quality by creating a gradient distribution of silica fine particles within the hard coat layer. The particle concentration is highest at the lower surface (adjacent to the light-transmitting substrate) and decreases toward the upper surface. This localized concentration strategy allows the antifouling agent to be effectively positioned where it provides maximum benefit while minimizing its presence in regions where it would cause transparency reduction and bleed-out, thus resolving the contradiction between antifouling performance and optical clarity.
Solution Approach 2:
The patent employs parameter changes by controlling the refractive index distribution through the gradient particle concentration. The silica fine particles have a refractive index lower than the binder resin, creating a refractive index gradient that matches the optical properties of the light-transmitting substrate. This parameter optimization allows sufficient antifouling agent incorporation while maintaining transparency by preventing optical interference and reducing visible particle effects.
3Strength
If uniform silica fine particles are distributed in the hard coat layer, then hardness is improved, but interference fringes occur
Solution Approach 1:
The patent applies local quality by creating a gradient distribution of silica fine particles within the hard coat layer. The particle concentration is highest at the lower surface (adjacent to the light-transmitting substrate) and decreases toward the upper surface. This localized concentration strategy allows the antifouling agent to be effectively positioned where it provides maximum benefit while minimizing its presence in regions where it would cause transparency reduction and bleed-out, thus resolving the contradiction between antifouling performance and optical clarity.
Solution Approach 2:
The patent employs parameter changes by controlling the refractive index distribution through the gradient particle concentration. The silica fine particles have a refractive index lower than the binder resin, creating a refractive index gradient that matches the optical properties of the light-transmitting substrate. This parameter optimization allows sufficient antifouling agent incorporation while maintaining transparency by preventing optical interference and reducing visible particle effects.
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 enables high hardness and effective antifouling properties with minimal antifouling agent usage, excellent adhesion between layers, and suppression of interference fringes, suitable for various display devices like CRTs, LCDs, and PDPs.
Implementation Method 1
the reactive irregularly shaped silica fine particles in the region (1) exhibiting a ratio of 30 to 90% in area, the reactive irregularly shaped silica fine particles in the region (2) exhibiting a ratio of 25 to 80% in area, the reactive irregularly shaped silica fine particles in the region (3) exhibiting a ratio of 10 to 35% in ratio, and the regions (1), (2), and (3) satisfying the following relationship: the ratio in area of the reactive irregularly shaped silica fine particles in the region (1) ≥ the ratio in area of the reactive irregularly shaped silica fine particles in the region (2)> the ratio in area of the reactive irregularly shaped silica fine particles in the region (3)
Data Source
AI summary
An optical layered body has a light-transmitting substrate and a hard coat layer formed on the light-transmitting substrate. The hard coat layer contains reactive irregularly shaped silica fine particles and a binder resin. The reactive irregularly shaped silica fine particles are unevenly distributed at the side of the light-transmitting substrate in the hard coat layer. The hard coat layer can be divided in its thickness direction into three equal regions (1)-(3), in an order from the interface on the side of the light-transmitting substrate. Ratios of reactive irregularly shaped silica fine particles in the regions (1)-(3) are 30 to 90% in area, 25 to 80% in area, and 10 to 35% in area, respectively. The ratios satisfy the following relationship: the ratio of the region (1)>the ratio of the region (2)>the ratio of the region (3).