OLED Antireflection Lines for External Light Reflection

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Solution Overview

Problem

Organic light emitting diode (OLED) display devices face issues with reduced brightness due to external light reflection, which is mitigated by polarizers but increases power consumption and reduces the lifetime of the organic light emitting layer, and is also costly.

Innovation Solution

The implementation of first and second antireflection lines with a multi-layered structure comprising metallic and inorganic layers on the substrate to block external light reflection, preventing parasitic capacitance and enhancing visibility while maintaining light transmittance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a polarizer is used to block external light reflection, then visibility is improved, but manufacturing cost increases and light transmittance decreases

Engineering Contradiction:

Improveexternal light reflectionVSAvoidmanufacturing cost

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The patent replaces the expensive polarizer with a cost-effective multilayer antireflection structure consisting of alternating high-refractive-index and low-refractive-index layers. This structure achieves effective light reflection blocking without the high manufacturing cost associated with polarizers, directly addressing the technical contradiction between visibility improvement and manufacturing cost reduction

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Object-affected harmful factors

If a polarizer is used to block external light reflection, then visibility is improved, but light transmittance decreases and power consumption increases

Engineering Contradiction:

Improveexternal light reflectionVSAvoidpower consumption

Core Design Contradiction:

Object-affected harmful factorsVSUse of energy by moving object

Solution Approach 1:

The multilayer antireflection structure maintains high light transmittance while blocking external reflections, eliminating the need for increased power consumption that would otherwise be required to compensate for brightness loss. This resolves the contradiction between visibility improvement and power consumption reduction

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Object-affected harmful factors

If a polarizer is used to block external light reflection, then visibility is improved, but the lifetime of the organic light emitting layer is reduced

Engineering Contradiction:

Improveexternal light reflectionVSAvoidlifetime of organic light emitting layer

Core Design Contradiction:

Object-affected harmful factorsVSDuration of action of stationary object

Solution Approach 1:

By replacing the polarizer with the multilayer antireflection structure, the patent eliminates the need to compensate for brightness loss through increased power consumption, thereby reducing stress on the organic light emitting layer and extending its operational lifetime while maintaining visibility improvement

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

4Object-affected harmful factors

If antireflection lines with metallic layers are used to block external light, then visibility is improved, but parasitic capacitance may form between layers

Engineering Contradiction:

Improveexternal light reflectionVSAvoidparasitic capacitance

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent introduces an organic insulation layer between the metallic layers of the multilayer antireflection structure. This intermediary layer effectively prevents parasitic capacitance formation between adjacent metallic layers while maintaining the light reflection blocking function, thus resolving the technical contradiction between visibility improvement and reliability maintenance

Inventive Principle:

Principle #24Intermediary (Mediator)

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 reduces manufacturing costs by eliminating the need for expensive polarizers, improves visibility by blocking external light, and maintains brightness by optimizing the antireflection and light transmittance balance.

Implementation Method 1

a first antireflection line formed on the substrate and including a first metallic layer and a first inorganic layer stacked sequentially... a second antireflection line formed on the gate insulation layer and including a second metallic layer and a second inorganic layer stacked sequentially

Methodology Applied

Scientific EffectReflection: Reflection

Implementation Method 2

the first inorganic layer connects the first metallic layer and the gate line electrically and the second inorganic layer connects the second metallic layer and the data line

Methodology Applied

Scientific EffectElectrical Conduction: Conduction (electrical)

Data Source

PatentUS9899622B2Organic light emitting diode display device including antireflection line

Publication Date: 2018.02.20 LG DISPLAY CO LTD

AI summary

An organic light emitting diode display device includes: a substrate; a first antireflection line formed on the substrate and including a first metallic layer and a first inorganic layer stacked sequentially; a gate line formed on the first antireflection line; a gate insulation layer formed on the substrate and the gate line; a second antireflection line formed on the gate insulation layer and including a second metallic layer and a second inorganic layer stacked sequentially; a data line formed on the second antireflection line; and wherein the first inorganic layer connects the first metallic layer and the gate line electrically and the second inorganic layer connects the second metallic layer and the data line.