Light-Emitting Device Structure Body Adhesion

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Solution Overview

Problem

Light-emitting devices using electroluminescence face challenges with adhesion between the light-emitting layer and electrodes, leading to potential damage during separation and external physical forces, such as bending, which can cause separation at the interface and damage to the light-emitting element.

Innovation Solution

A light-emitting device structure with a bonding layer between substrates and a structure body in contact with the bonding or electrode layers to enhance adhesion, preventing damage from external forces by separating the light-emitting layer using the structure body.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the light-emitting layer is separated from the electrode by physical force, then the flexible substrate can be applied, but the adhesion between the light-emitting layer and electrode is low causing separation at the interface

Engineering Contradiction:

Improveflexible substrate applicationVSAvoidadhesion between light-emitting layer and electrode

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

An organic insulating layer is introduced as an intermediary between the light-emitting layer and the electrode. This layer serves as a mediator that prevents direct contact while maintaining adhesion, resolving the contradiction by providing both mechanical support and electrical insulation, thereby preventing separation at the interface during physical force application.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent employs a composite structure combining the light-emitting layer with an organic insulating layer and electrode material. This composite material approach creates a multi-functional layer that simultaneously provides adhesion, insulation, and mechanical strength, enabling flexible substrate application without compromising interface integrity.

Inventive Principle:

Principle #40Composite materials

2Adaptability or versatility

If physical force such as bending is applied to the light-emitting device, then flexibility is achieved, but separation at the interface and damage to the light-emitting element may occur

Engineering Contradiction:

ImproveflexibilityVSAvoidresistance to separation and damage

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The organic insulating layer is positioned beforehand between the light-emitting layer and electrode to cushion against the effects of bending forces. This pre-positioned protective layer absorbs and distributes mechanical stress, preventing direct transmission of bending forces to the interface and thereby preventing separation and damage during flexing operations.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Speed

If the light-emitting element is made thin and lightweight, then response time is high, but the element becomes more susceptible to damage from external forces

Engineering Contradiction:

Improveresponse timeVSAvoidresistance to external physical forces

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent utilizes thin-film structures for the light-emitting element to maintain high response time, while simultaneously employing the organic insulating layer as a protective flexible shell. This thin film approach with protective coating allows the element to remain lightweight and fast-responding while gaining enhanced resistance to external physical forces through the protective layering.

Inventive Principle:

Principle #30Flexible shells and thin films

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 enhanced adhesion between the structure body and bonding or electrode layers ensures a highly reliable light-emitting device that withstands external physical forces without damage, maintaining the integrity of the light-emitting element.

Implementation Method 1

a bonding layer provided between the first substrate and the second substrate

Methodology Applied

Scientific EffectAdhesion: Adhesive

Implementation Method 2

a structure body formed over the first substrate... The light-emitting layer is separated by the structure body

Methodology Applied

Scientific EffectMechanical support and separation:

Data Source

PatentUS9337244B2Light-emitting device and electronic device using light-emitting device

Publication Date: 2016.05.10 SEMICON ENERGY LAB CO LTD

AI summary

Provided is a highly reliable light-emitting device in which a light-emitting element is prevented from being damaged when external physical force is applied. The light-emitting device includes a light-emitting element formed over a first substrate, including a first electrode layer, a light-emitting layer, and a second electrode layer; a structure body formed over the first substrate; a second substrate provided to face the first substrate; and a bonding layer provided between the first substrate and the second substrate. The light-emitting layer is separated by the structure body. By strengthening adhesion between the structure body and the bonding layer, or between the structure body and the second electrode, the highly reliable light-emitting device in which damage of the light-emitting element is prevented can be provided.