Conductive Laminate Body Refractive Index Optimization
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Solution Overview
Problem
Conventional touch panels using indium tin oxide (ITO) electrodes face issues with increased surface resistivity as screen size grows, leading to slower current transmission and visibility problems due to moiré phenomena when using non-translucent metal electrodes.
Innovation Solution
A conductive laminate body with a substrate and protective layers having a relative refractive index of 0.86 to 1.15 is used, forming a mesh pattern with thin metal wires, which reduces light scattering and visibility of metal wire contrast, thereby suppressing moiré phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If ITO is used as the electrode material, then the touch panel achieves good translucency, but the surface resistivity increases as screen size increases, leading to slower current transmission
Solution Approach 1:
The patent changes the material parameter from ITO (oxide) to metal (such as aluminum), fundamentally altering the electrical and optical properties. This material substitution enables low surface resistivity while maintaining translucency through the mesh structure design
Solution Approach 2:
The electrode is segmented into a mesh pattern of thin metal wires rather than using a continuous film. This segmentation reduces the amount of material needed, improves light transmission, and maintains electrical conductivity through the interconnected wire structure
2Reliability
If thin metal wires are used to form a mesh pattern, then surface resistivity decreases and current transmission improves, but moiré phenomena become visible and contrast increases
Solution Approach 1:
The patent optimizes the wire diameter parameter to a specific range (1-10 μm, preferably 2-5 μm) and controls the mesh pitch parameter. These parameter adjustments reduce the visual impact of the mesh pattern while maintaining electrical performance
Solution Approach 2:
The patent employs asymmetric mesh patterns where the wire spacing and dimensions vary in different directions or regions. This asymmetry disrupts the regular periodic structure that causes moiré phenomena, while still maintaining effective electrical conductivity across the electrode surface
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 effectively decreases the contrast caused by thin metal wires, making them less visible and suppressing moiré phenomena, while maintaining efficient current transmission.
Implementation Method 1
at least one of a relative index of refraction of the substrate with respect to the first protective layer and a relative index of refraction of the substrate with respect to the second protective layer is 0.86 to 1.15
Data Source
AI summary
This present invention pertains to: a conductive laminate body, a touch panel, and a display device. In the present invention, the relative refractive index of a substrate with respect to a first protective sheet, and/or the relative refractive index of the substrate with respect to a second protective sheet is 0.86-1.15. The relative refractive index of a first substrate with respect to the first protective sheet, and/or the relative refractive index of a second substrate with respect to the second protective sheet is 0.86-1.15.