Thin Film Conductive Pattern Darkening for Low Reflectivity

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Solution Overview

Problem

Existing methods for creating electrically-conductive metal-containing patterns on transparent substrates fail to effectively reduce light reflectivity, making them visible and undesirable for applications like thin-film antennas.

Innovation Solution

A method involving a catalytic ink pattern on a first substrate, followed by electroless plating to form a metallic pattern, applying a darkening agent to one surface, transferring the pattern to a second substrate, and applying a second darkening agent to the opposing surface, thereby reducing light reflectivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a thin-film electrically-conductive metal-containing pattern is provided on a transparent substrate, then electrical conductivity is improved, but light reflectivity increases making the pattern visible

Engineering Contradiction:

Improveelectrical conductivityVSAvoidlight reflectivity

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent divides the metallic pattern into multiple discrete metallic features (lines, dots, or shapes) arranged in a grid or array pattern. This segmentation allows light to pass through the gaps between features while maintaining electrical conductivity through the conductive paths, thereby reducing overall light reflectivity while preserving electrical functionality.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies different properties to different regions: the metallic features provide high electrical conductivity where needed, while the spaces between features allow light transmission. The metallic pattern is strategically positioned and sized to optimize both electrical performance and optical transparency, creating local variations in conductivity and reflectivity properties.

Inventive Principle:

Principle #3Local quality

2Reliability

If the metallic pattern is made more dense to improve conductivity, then electrical conductivity is improved, but optical transparency decreases

Engineering Contradiction:

Improveelectrical conductivityVSAvoidoptical transparency

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

The patent employs a dual-layer system where a first metallic pattern is applied to the front surface and a second metallic pattern is applied to the back surface of the substrate. This dynamic configuration allows each layer to be optimized independently: the front layer provides electrical connectivity while the back layer compensates for conductivity, enabling lower density in each individual layer while maintaining overall high conductivity and transparency.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent creates a composite structure combining transparent substrate material with dispersed metallic features arranged in specific geometric patterns. This composite approach allows the system to exhibit both optical transparency (from the substrate and spacing) and electrical conductivity (from the metallic network), achieving a balance that neither pure metal nor pure transparent material could provide alone.

Inventive Principle:

Principle #40Composite materials

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 method significantly reduces the reflectivity of the metallic patterns, making them less observable, especially when viewed from either side of the substrate, thus enhancing their suitability for applications where visibility is critical.

Implementation Method 1

electrolessly plating a metal on the cured catalytic ink pattern to form a metallic pattern

Methodology Applied

Scientific EffectElectroless plating: Electroplating

Implementation Method 2

applying a first darkening agent directly to a first surface of the metallic pattern to form a first darkened surface... applying a second darkening agent directly to the undarkened second surface

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentUS20250040055A1Method to make thin film electrically-conductive pattern

Publication Date: 2025.01.30 EASTMAN KODAK CO

AI summary

An article comprising an electrically-conductive metal-containing pattern is provided by: A-1) providing a pattern of a catalytic ink on a surface of a first substrate; A-2) curing the pattern of the catalytic ink sufficient to form a cured catalytic ink pattern; A-3) electrolessly plating a metal on the cured catalytic ink pattern to form a metallic pattern on the cured catalytic ink pattern; B) applying a first darkening agent directly to a first surface of the metallic pattern to form a first darkened surface; C) transferring the metallic pattern to a second substrate so that the first darkened surface is in direct contact with the surface of the second substrate, leaving an undarkened second surface of the metallic pattern exposed to view; and D) applying a second darkening agent directly to the undarkened second surface of the metallic pattern, to form a second darkened surface of the metallic pattern.