Transparent Electrode Layout for Low-Visibility Capacitive Sensors
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Solution Overview
Problem
Existing transparent electrode members, particularly in capacitive sensors, face challenges in maintaining visibility while ensuring the invisibility of their patterns, as the difference in reflectance between conductive and insulating regions can lead to a decrease in display image visibility.
Innovation Solution
A transparent electrode member is designed with a translucent base, conductive regions, and optical adjustment regions, where the dispersion density of conductive nanowires is lower in the optical adjustment regions, and an insulating layer is disposed in a manner that matches the lattice points on the surface, ensuring a specific area ratio and spacing to enhance invisibility without compromising conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transparent electrode member uses a conductive pattern layer with metal oxide material or silver nanowires, then the conductivity is improved, but the visual difference between pattern portion and non-pattern portion increases, decreasing display visibility
Solution Approach 1:
The patent applies local quality by creating optical adjustment regions with different dispersion densities of conductive nanowires. The first regions have higher dispersion density for conductivity, while the second regions have lower dispersion density to reduce visual difference. This local variation in material density resolves the contradiction between maintaining conductivity and improving display visibility.
Solution Approach 2:
The patent changes the dispersion density parameter of conductive nanowires in different regions. By adjusting this parameter locally - higher in conductive regions, lower in optical adjustment regions - the patent achieves both sufficient conductivity and reduced visual contrast, thereby improving display visibility while maintaining electrical performance.
2Illumination intensity
If the transparent electrode member increases the area of insulating pattern layer to improve invisibility, then the visual difference decreases, but the conductivity of the electrode is reduced
Solution Approach 1:
The patent segments the electrode structure into distinct functional regions: conductive regions with high nanowire density for electricity conduction, and optical adjustment regions with low nanowire density for visual uniformity. This segmentation allows each region to optimize its specific function without compromising the other, resolving the contradiction between invisibility and conductivity.
Solution Approach 2:
The patent introduces a spatial dimension by varying the dispersion density of nanowires across different regions of the electrode. This dimensional approach allows the electrode to simultaneously achieve high conductivity in certain areas and low visual contrast in others, resolving the contradiction that would exist in a uniform structure.
Data Source
AI summary
A transparent electrode member includes a translucent base, and first transparent electrodes that are arranged side by side in a first direction on a first surface of the base. An insulating layer does not overlap partial regions PR when viewed in the direction of the normal to the first surface. A rectangular region in which a part other than the conductive portion is composed of the partial regions over the entire part is defined as a first rectangular region, a rectangular region in which at least the insulating layer is contained is defined as a second rectangular region, and a relationship between an area Sa of the part other than the conductive portion in the first rectangular region and an area Sb of a part other than the conductive portion in the second rectangular region satisfies Sa/Sb=1±0.3.