Optical Film Polysaccharide Adhesive Layer Durability
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Solution Overview
Problem
Resin films used in touch panels face challenges in achieving high keystroke durability while maintaining manufacturing suitability and suppressing interference unevenness, particularly when thickened for durability, which complicates manufacturing efficiency and smoothness.
Innovation Solution
An optical film configuration with a first resin film, an adhesive layer containing polysaccharides like cellulose, and a second resin film, where the polysaccharide adhesive layer reduces refractive index differences and enhances interlaminar adhesion, improving keystroke durability and manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the film thickness of the resin film is increased to improve keystroke durability, then keystroke durability is improved, but manufacturing efficiency deteriorates due to longer drying time and manufacturing complexity
Solution Approach 1:
The patent divides the thick resin film into multiple thinner resin film layers (first resin film, second resin film, etc.) bonded together with adhesive layers. This segmentation allows each layer to be manufactured with shorter drying time while achieving the required total thickness for keystroke durability through lamination.
Solution Approach 2:
The patent transitions from manufacturing a single thick film in one dimension to manufacturing multiple thinner films and combining them in the thickness dimension through lamination. This dimensional approach enables parallel manufacturing of thinner layers with improved efficiency.
2Reliability
If the film thickness of the resin film is increased to improve keystroke durability, then keystroke durability is improved, but smoothness deteriorates due to difficulty in maintaining surface quality
Solution Approach 1:
By segmenting the thick film into multiple thinner layers, each layer can be manufactured and controlled for surface smoothness independently. The adhesive layers between segments help maintain overall surface quality while achieving the required total thickness for durability.
3Ease of manufacture
If resin films are bonded to each other to improve manufacturing suitability, then manufacturing efficiency is improved, but interference unevenness occurs due to refractive index differences
Solution Approach 1:
The patent introduces adhesive layers as intermediary materials between resin film layers. These adhesive layers have refractive indexes specifically selected to match or bridge the refractive indexes of adjacent resin films, thereby reducing interference unevenness while enabling the lamination structure for improved manufacturing suitability.
Solution Approach 2:
The patent controls the refractive index parameter of the adhesive layers to be within specific ranges (1.35-1.55) that match the resin films. By adjusting this optical parameter, the patent eliminates interference unevenness while maintaining the manufacturing advantages of bonded multi-layer structure.
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 optical film effectively suppresses interference unevenness and enhances keystroke durability while maintaining manufacturing suitability, ensuring the resin films' smoothness and efficiency in production.
Implementation Method 1
the adhesive layer contains a polysaccharide... the polysaccharide adhesive layer reduces refractive index differences and enhances interlaminar adhesion, improving keystroke durability and manufacturing efficiency
Implementation Method 2
an adhesive layer disposed on one side of the first resin film, and a second resin film disposed on the adhesive layer... the polysaccharide adhesive layer reduces refractive index differences and enhances interlaminar adhesion
Data Source
AI summary
An optical film, a front panel of an image display apparatus, the image display apparatus, a mirror with an image display function, a resistive film-type touch panel, and a capacitance-type touch panel which have the optical film can be provided. The optical film includes at least a first resin film, an adhesive layer disposed on one side of the first resin film, and a second resin film disposed on the adhesive layer, and the adhesive layer contains a polysaccharide.