Light-Reflective Anisotropic Conductive Adhesive for LED Efficiency

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Solution Overview

Problem

Conventional light-emitting devices face reduced light-emitting efficiency due to absorption by gold wires and adhesives, and the cost of providing a light-reflective layer, while two-liquid curable silicones improve heat and light resistance but lack sufficient die shear strength for practical use.

Innovation Solution

A light-reflective anisotropic conductive adhesive is developed, incorporating diglycidyl isocyanuryl modified polysiloxane as a binder, light-reflective insulating particles like titanium oxide, and conductive particles with a metal core and inorganic coatings, which enhances light reflection and maintains die shear strength.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If a light-reflective layer is provided on the LED element to improve light-emitting efficiency, then light reflection is improved, but production cost increases due to metal vapor deposition

Engineering Contradiction:

Improvelight-emitting efficiencyVSAvoidproduction cost

Core Design Contradiction:

Loss of energyVSEase of manufacture

Solution Approach 1:

The patent combines the light-reflective function and the adhesive function into a single integrated component. The adhesive layer itself is formulated with light-reflective properties through the use of specific resin compositions and reflective particles, eliminating the need for a separate light-reflective layer and reducing production steps

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The adhesive layer is designed to perform multiple functions simultaneously: it provides electrical connection, mechanical bonding, and light reflection. This multi-functional design eliminates the need for separate specialized layers, reducing overall device complexity and manufacturing cost

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If two-liquid curable methyl silicone resin or phenyl silicone resin is used for heat and light resistance, then discoloration is prevented, but die shear strength is insufficient for practical use

Engineering Contradiction:

Improveheat and light resistanceVSAvoiddie shear strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent uses a composite resin composition that combines multiple resin types and additives to achieve both heat/light resistance and adequate strength. The specific formulation includes crosslinking agents and reinforcing particles that enhance mechanical properties while maintaining resistance to discoloration

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the chemical composition and curing characteristics of the resin to optimize both thermal stability and mechanical strength. By adjusting molecular weight, crosslink density, and functional group composition, the material achieves simultaneous improvement in heat resistance and die shear strength

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If conventional adhesive materials are used without light reflection, then manufacturing is simple, but light-emitting efficiency is reduced due to light absorption

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidlight-emitting efficiency

Core Design Contradiction:

Ease of manufactureVSLoss of energy

Solution Approach 1:

The patent changes the optical parameters of the adhesive material by incorporating reflective particles and adjusting the resin's refractive index. This allows the adhesive to reflect light effectively while maintaining simple manufacturing processes and material application methods

Inventive Principle:

Principle #35Parameter changes

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 adhesive improves light-emitting efficiency by reflecting light without absorbing it, maintains die shear strength for practical use, and resists heat and light discoloration, eliminating the need for a costly light-reflective layer.

Implementation Method 1

The adhesive improves light-emitting efficiency by reflecting light without absorbing it

Methodology Applied

Scientific EffectLight reflection: Reflection

Implementation Method 2

light-reflective anisotropic conductive adhesive used for anisotropic conductive connection

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 3

the thermosetting resin composition includes a diglycidyl isocyanuryl modified polysiloxane and a curing agent for an epoxy resin

Methodology Applied

Scientific EffectChemical curing: Chemical Bonding

Implementation Method 4

conductive particles with a metal core and inorganic coatings

Methodology Applied

Scientific EffectPhysical vapor deposition: Physical Vapour Deposition

Data Source

PatentUS10246613B2Light-reflective anisotropic conductive adhesive and light-emitting device

Publication Date: 2019.04.02 DEXERIALS CORP

AI summary

A light-reflective anisotropic conductive adhesive used for anisotropic conductive connection of a light-emitting element to a wiring substrate includes a thermosetting resin composition, conductive particles, and light-reflective insulating particles. The thermosetting resin composition includes a diglycidyl isocyanuryl modified polysiloxane represented by the formula (1), and a curing agent for an epoxy resin.