Light Emitting Device Shield Cap Pressure Absorption

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Large-sized organic light emitting devices are prone to damage and degradation due to external pressure, which causes deformation of the shield cap and substrate, leading to pollution of the emission unit by moisture absorbents, resulting in reduced lifespan and increased weight.

Innovation Solution

The use of spacers and inert liquids or gases between the substrate and shield cap to absorb external pressure and prevent contact between the emission unit and moisture absorbents, while maintaining a thin and lightweight design.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If the shield cap is made thicker to reduce external impact influence, then the protection against external pressure is improved, but the device becomes very heavy-weight

Engineering Contradiction:

Improveprotection against external pressureVSAvoiddevice weight

Core Design Contradiction:

StrengthVSWeight of stationary object

Solution Approach 1:

The patent introduces a cushioning layer composed of inert liquid or gas between the substrate and shield cap to absorb external pressure before it reaches the emission unit. This beforehand cushioning mechanism allows the use of thinner shield caps without compromising protection, thereby reducing device weight while maintaining strength against external impacts

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The inert liquid or gas acts as an intermediary substance between the external environment and the emission unit. This mediator absorbs and distributes external pressure, preventing direct transmission to the fragile emission unit, thus allowing thinner shield cap design with reduced weight

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If moisture absorbents are placed inside the shield cap to prevent moisture penetration, then moisture protection is improved, but the emission unit may be polluted by moisture absorbents when deformation occurs

Engineering Contradiction:

Improvemoisture protectionVSAvoidpollution of emission unit

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The cushioning layer of inert liquid or gas serves as an intermediary barrier between the moisture absorbents and the emission unit. When external pressure causes deformation, this intermediary layer prevents direct contact between moisture absorbents and the emission unit, thus protecting against pollution while maintaining moisture protection functionality

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent extracts the harmful potential of moisture absorbents by separating them from direct contact with the emission unit through the cushioning layer. This spatial separation allows moisture absorbents to perform their function without posing a pollution risk to the emission unit during deformation events

Inventive Principle:

Principle #2Taking out (Extraction)

3Object-affected harmful factors

If spacers and inert liquids or gases are introduced to prevent contact between emission unit and moisture absorbents, then protection from pollution is improved, but device complexity increases

Engineering Contradiction:

Improvepollution preventionVSAvoidstructural complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent merges the cushioning function and moisture absorption function into a single integrated space between the substrate and shield cap. The inert liquid or gas provides both mechanical cushioning and prevents contact between moisture absorbents and emission unit, eliminating the need for separate complex structural elements while maintaining protection functionality

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The inert liquid or gas layer performs multiple functions simultaneously: it acts as a cushioning layer to absorb external pressure, prevents direct contact between moisture absorbents and the emission unit, and maintains the structural integrity of the device. This multi-functionality reduces overall device complexity compared to having separate dedicated components for each function

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

This solution effectively protects the organic light emitting device from external impacts, preventing degradation and maintaining a thin, lightweight structure without increasing the thickness or weight of the device.

Implementation Method 1

filling a space between a substrate and a shield cap with an inert liquid or an inert gas or by forming a spacer

Methodology Applied

Scientific EffectPressure absorption: Absorption (physical)

Data Source

PatentEP1875777B1Light emitting device

Publication Date: 2017.10.25 LG DISPLAY CO LTD

AI summary

A light emitting device is provided. The light emitting device includes a substrate including a non-emission region and an emission region, an emission unit which is located on the substrate and includes a first electrode, a second electrode and an emission layer interposed between the first and second electrodes, a shield cap adhered to the substrate to encapsulate the emission unit, and an inert liquid or an inert gas in a space between the substrate and the shield cap.