Transparent Electrode Sheet Color Uniformity via Silver Halide Photosensitive Material
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Solution Overview
Problem
Capacitive touch panels face issues with color unevenness and poor visibility due to changes in the color tone of conductive thin wires, particularly when formed using silver halide photographic photosensitive materials, which affect the visibility and reliability of large-screen touch panels.
Innovation Solution
A transparent electrode sheet with patterned electrodes formed using a silver halide photosensitive material, where the reflection chromaticity difference between the electrode surfaces is controlled to ensure uniform color tone, achieved by optimizing the silver/binder ratio, mercapto compound content, and silver bromide distribution in the photosensitive layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive thin wires are formed using silver halide photographic photosensitive materials, then low resistance can be achieved, but color tone changes occur causing poor visibility
Solution Approach 1:
The patent applies local quality by differentiating the photosensitive layer structure into multiple layers with different silver halide compositions. The first photosensitive layer contains silver chlorobromide emulsion while the second layer contains silver bromide emulsion, creating localized compositional differences that control color tone uniformly across the electrode surface.
Solution Approach 2:
The patent changes parameters by controlling the silver/binder ratio within specific ranges (0.5-2.0 for first layer, 0.3-1.5 for second layer) and adjusting silver halide grain size distributions. These parameter optimizations prevent color tone changes while maintaining low resistance properties.
2Reliability
If the film thickness is increased to reduce resistance, then low resistance is achieved, but color tone uniformity deteriorates
Solution Approach 1:
The patent segments the electrode film into multiple photosensitive layers with different compositions and thicknesses. The first layer has thickness 5-20 μm and the second layer has thickness 3-10 μm, creating a segmented structure that maintains color uniformity while achieving overall low resistance through cumulative conductive effect.
Solution Approach 2:
The patent uses composite materials by combining silver chlorobromide emulsion in the first layer with silver bromide emulsion in the second layer. This composite structure leverages the complementary properties of different silver halides to achieve both low resistance and color uniformity.
3Manufacturing precision
If photolithography is used to form thin wires, then manufacturing precision can be achieved, but manufacturing complexity increases due to multiple steps
Solution Approach 1:
The patent merges multiple functions into a single photosensitive material structure. By incorporating silver halide emulsions that directly form conductive silver wires upon development, the patent combines patterning, wire formation, and conductivity generation into one integrated process, eliminating separate photolithography and metal deposition steps.
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 provides a transparent electrode sheet with improved color uniformity and low resistance, enabling large-area touch panels with enhanced visibility and stability, suitable for capacitive touch panels, resistive film type touch panels, electromagnetic wave shielding, and antistatic applications.
Implementation Method 1
a phenomenon in which the color of conductive thin wires made from developed silver as formed delicately changes depending upon various conditions occurs
Data Source
AI summary
A transparent electrode sheet includes a transparent support having thereon a patterned electrode, wherein the electrode is made from a metal thin wire, a thickness of the metal thin wire is 0.1 μm or more, and an absolute value of a difference between a reflection chromaticity b1* of a surface of the electrode at far side from the transparent support and a reflection chromaticity b2* of a surface of the electrode at near side to the transparent support is not more than 2.