Touch Panel Reflection Conversion and Pigmented Adhesive Layers
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Solution Overview
Problem
Conventional touch panels reflect external light, making it difficult for users to see the indication of the display element on the rear face, which hinders easy and reliable operation of electronic devices.
Innovation Solution
The touch panel incorporates reflection conversion layers and reflection reducing adhesive layers with dispersed pigment, which reduce the reflection of external light by matching the refractive index of the conductive layers and absorbing specific wavelengths of light, ensuring minimal visibility of the conductive layers' contours.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional adhesive layers are used without pigment, then light transmission is maintained, but external light reflection occurs making display indication difficult to see
Solution Approach 1:
The patent applies pigment dispersion in adhesive layers to change the optical properties of the adhesive. The pigment absorbs specific wavelengths of external light, reducing reflection and improving visibility of the display indication through the touch panel.
Solution Approach 2:
The patent creates a composite adhesive layer by dispersing pigment particles within the adhesive matrix. This composite structure combines the adhesive function with light absorption properties, solving both bonding and visibility problems simultaneously.
2Illumination intensity
If pigment is added to adhesive layers to reduce reflection, then visibility improves, but light transmission may be reduced
Solution Approach 1:
The patent applies pigment dispersion locally in the adhesive layers rather than throughout the entire touch panel structure. This localized application targets the specific interface where reflection occurs, improving visibility while minimizing impact on overall light transmission through the panel.
Solution Approach 2:
The patent optimizes the concentration and type of pigment dispersed in the adhesive layers to achieve the right balance between reflection reduction and light transmission. By carefully controlling pigment parameters, the system improves visibility while maintaining adequate light transmission for display functionality.
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 design allows users to easily see the display element on the rear face, enabling reliable and efficient operation of electronic devices by minimizing light reflection and maintaining high light transmission across the visible spectrum.
Implementation Method 1
multiple belt-like second conductive layers formed on the second reflection conversion layer in a direction perpendicular to the first conductive layers, a second adhesive layer formed on the second conductive layers, and a cover sheet disposed on the second adhesive layer. Pigment is dispersed in at least one of the first adhesive layer and the second adhesive layer.
Data Source
AI summary
A touch panel includes a first substrate, a first reflection conversion layer formed on the first substrate, multiple belt-like first conductive layers formed on the first reflection conversion layer, and a first adhesive layer formed on the first conductive layers. The touch panel further includes a second substrate formed on the first adhesive layer, a second reflection conversion layer formed on the second substrate, multiple belt-like second conductive layers formed on the second reflection conversion layer in a direction perpendicular to the first conductive layers, a second adhesive layer formed on the second conductive layers, and a cover sheet disposed on the second adhesive layer. Pigment is dispersed in at least one of the first adhesive layer and the second adhesive layer.