Optical Matching Glue for Touch Panel Refractive Index
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Solution Overview
Problem
Conventional touch panels experience display defects due to refractive index differences between the electrode patterns and air or optical glue, which are not effectively addressed by traditional optical compensation films that increase panel thickness and complexity.
Innovation Solution
A touch panel with an optical matching glue is developed, comprising acrylic resin, acrylic monomers, and refractive index matching materials, where the glue's refractive index matches that of the electrode patterns, eliminating the need for additional optical compensation films by filling gaps between the substrate and electrode patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an optical compensation film is formed on the electrode pattern to reduce display defects, then the refractive index matching is improved, but the panel thickness increases and manufacturing complexity increases
Solution Approach 1:
The patent combines the optical compensation function and adhesive function into a single optical matching glue layer, eliminating the need for a separate optical compensation film. This merging of functions reduces the number of components and simplifies the overall panel structure while maintaining the refractive index matching capability to reduce display defects.
Solution Approach 2:
The optical matching glue serves multiple functions simultaneously: it acts as an adhesive to bond the electrode pattern to the substrate, provides refractive index matching to reduce optical defects, and fills gaps between components. This multi-functionality eliminates the need for separate optical compensation films and reduces manufacturing complexity.
2Manufacturing precision
If an optical compensation film is formed on the electrode pattern to reduce display defects, then the refractive index matching is improved, but the manufacturing process becomes more complicated
Solution Approach 1:
The patent merges the optical compensation function with the adhesive function into a single material layer, reducing the number of manufacturing steps. Instead of separately forming an optical compensation film and then applying adhesive, the optical matching glue performs both functions in one step, simplifying the manufacturing process.
Solution Approach 2:
The optical matching glue provides multiple functions including adhesion, refractive index matching, and gap filling, eliminating the need for separate optical compensation film formation steps. This multi-functionality streamlines the manufacturing process while maintaining high display quality.
3Ease of manufacture
If conventional optical glue is used to fill gaps between substrate and electrode pattern, then the manufacturing process is simple, but display defects occur due to refractive index difference
Solution Approach 1:
The patent changes the refractive index parameter of the optical glue to match that of the electrode pattern and substrate. By adjusting the refractive index of the optical matching glue to be between 1.8-2.2 (matching ITO electrode patterns), optical defects such as chromatic aberrations are eliminated while maintaining manufacturing simplicity.
Solution Approach 2:
The optical matching glue is formulated as a composite material containing acrylic resin, acrylic monomers, and refractive index matching materials in specific proportions. This composite composition enables the glue to achieve both adhesive properties and refractive index matching capability, solving the display defects issue while keeping the manufacturing process simple.
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
This solution reduces display defects and maintains panel thickness and manufacturing simplicity by ensuring the refractive index of the optical matching glue closely matches the electrode patterns, thereby avoiding chromatic aberrations and other display issues.
Implementation Method 1
the refractive index of the electrode pattern is different from the refractive index of the air or of a normal optical glue... Therefore, due to the refractive index difference, some display defects may arise on the user interface, such as chromatic aberrations
Data Source
AI summary
A touch panel, comprises a substrate, a sensing layer disposed on the substrate, wherein the sensing layer includes a plurality of electrode patterns disposed on at least one surface of the substrate, and arranged in interval; an optical matching glue disposed on the sensing layer and filled in the intervals, wherein the refractive index of the optical matching glue matches the refractive index of the sensing layer. The present invention further comprises an optical matching glue and the manufacturing method thereof. When using the touch panel of the present invention, the defects of appearance caused by the refractive index difference between the electrode pattern and the intervals can be reduced without any additional process.