Anisotropic Conductive Film Reflective Layer

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Solution Overview

Problem

Traditional anisotropic conductive films (ACFs) face challenges in achieving high conductive particle density for ultra-fine pitch applications, leading to issues with attachment to electrode substrates, light intensity, and color purity in light-emitting and light-transmitting devices due to high conductive particle concentrations and random dispersion patterns.

Innovation Solution

An anisotropic conductive film with a non-reflective adhesive layer and a reflective adhesive layer containing at least five percent reflective particles by weight, or a thin film deposited reflective layer, which improves attachment and light output while maintaining high conductive particle density.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the concentration of conductive particles is increased to achieve ultra-fine pitch bonding, then the electrical conductivity between electrodes is improved, but the attachment of ACF to electrode substrate deteriorates and the probability of short circuit increases

Engineering Contradiction:

Improveelectrical conductivityVSAvoidshort circuit and attachment failure

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The conductive particles are arranged in a fixed array pattern with predetermined spacing, segmenting the particle distribution into discrete locations. This segmentation ensures particles are positioned only where needed (on electrodes) rather than randomly dispersed, achieving high conductivity without increasing overall particle concentration or causing shorts in spacing areas.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The fixed-array structure provides different particle densities in different locations: high density at electrode positions for conductivity, and zero density in spacing areas to prevent shorts. This local quality variation resolves the contradiction between needing high particle concentration for conductivity and low concentration to avoid short circuits.

Inventive Principle:

Principle #3Local quality

2Quantity of substance

If the density of conductive particles is increased for fine pitch applications, then the particle density on electrodes is improved, but the attachment of ACF to electrode substrate deteriorates

Engineering Contradiction:

Improveparticle densityVSAvoidattachment

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The fixed-array configuration segments particles into discrete positions, allowing high particle density at specific electrode locations without uniformly increasing density across the entire ACF surface. This maintains attachment performance while achieving the required particle density for fine pitch applications.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

High particle density is localized only at electrode positions where it is needed for conductivity, while spacing areas maintain low particle density to ensure proper attachment. This resolves the contradiction between needing high particle density for fine pitch and maintaining attachment reliability.

Inventive Principle:

Principle #3Local quality

3Illumination intensity

If a reflective layer is added to improve light output and color purity, then the light intensity and color purity are improved, but the device complexity increases

Engineering Contradiction:

Improvelight outputVSAvoidACF structure

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The reflective layer is merged with the ACF structure, integrating light management functionality into the existing conductive film. This combining approach improves light output and color purity without significantly increasing overall device complexity, as the reflective layer becomes part of the ACF assembly rather than a separate component.

Inventive Principle:

Principle #5Merging (Combining)

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 enhances light output, color purity, and attachment to electrode substrates, achieving improved reflectivity and particle transfer efficiency while maintaining high conductive particle density, addressing the limitations of traditional ACFs.

Implementation Method 1

The reflective layer may be an adhesive layer including a reflective additive, or a thin film deposited reflective layer. The reflective layer of the ACF results in improved light output and color purity characteristics

Methodology Applied

Scientific EffectReflection: Reflection

Implementation Method 2

The conductive particles of the ACF provide anisotropic electrical conductivity between the panel electrodes and the driver IC

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 3

a first non-reflective adhesive layer, a second reflective adhesive layer disposed along a top surface of the first adhesive layer

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentUS9871177B2Anisotropic conductive film (ACF) including a relfective layer

Publication Date: 2018.01.16 POLAROID IP BV

AI summary

An anisotropic conductive film (ACF) is disclosed. In one approach, the ACF includes a non-reflective adhesive layer including a top surface, a plurality of conductive particles included with the non-reflective adhesive layer, and a reflective adhesive layer disposed along the top surface of the non-reflective adhesive layer. The reflective layer includes at least five percent reflective particles by percentage weight.