Electroluminescent Display Bank Layer Segmentation

Solution Overview

Problem

Existing electroluminescent display devices face reduced brightness and light extraction efficiency due to light diffusion from electrodes and potential electrode disconnection, leading to degradation of image quality.

Innovation Solution

The implementation of a bank layer with openings and connecting opening patterns to expose electrodes, enhancing light extraction efficiency while preventing image quality degradation by ensuring stable electrode connections.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If a bank layer with openings is used to improve light extraction efficiency, then light extraction efficiency is improved, but electrode disconnection may occur leading to image quality degradation

Engineering Contradiction:

Improvelight extraction efficiencyVSAvoidelectrode connection stability

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The bank layer is segmented into multiple openings rather than being continuous, allowing light to pass through while maintaining structural integrity. The openings are distributed in a pattern that balances light extraction with electrode protection.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A connection pattern layer is introduced as an intermediary between the bank layer openings and the electrode. This connection pattern acts as a mediator that guides and stabilizes the electrode structure through the openings, preventing disconnection while allowing light extraction.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Illumination intensity

If openings are created in the bank layer to enhance light extraction, then brightness is improved, but electrode disconnection risk increases

Engineering Contradiction:

ImprovebrightnessVSAvoidelectrode connection stability

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The bank layer is divided into multiple discrete openings rather than being continuous, allowing light to pass through while maintaining structural integrity. The openings are distributed in a pattern that balances light extraction with electrode protection.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A connection pattern layer is introduced as an intermediary between the bank layer openings and the electrode. This connection pattern acts as a mediator that guides and stabilizes the electrode structure through the openings, preventing disconnection while allowing light extraction.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If the bank layer is made continuous to prevent electrode disconnection, then electrode stability is improved, but light extraction efficiency decreases

Engineering Contradiction:

Improveelectrode connection stabilityVSAvoidlight extraction efficiency

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The bank layer is segmented into multiple openings rather than being continuous, allowing light to pass through while maintaining structural integrity. The openings are distributed in a pattern that balances light extraction with electrode protection.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A connection pattern layer is introduced as an intermediary between the bank layer openings and the electrode. This connection pattern acts as a mediator that guides and stabilizes the electrode structure through the openings, preventing disconnection while allowing light extraction.

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 configuration improves light extraction efficiency and maintains image quality by stabilizing electrode connections, even in cases of potential disconnection, thereby enhancing the overall performance of electroluminescent display devices.

Implementation Method 1

an electroluminescent display device is a device in which a charge is injected into an emitting layer formed between a cathode, which is an electron-injecting electrode, and an anode, which is a hole-injecting electrode, such that excitons are formed, and then radiative recombination of the excitons occurs such that light is emitted

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS10720597B2Electroluminescent display device

Publication Date: 2020.07.21 LG DISPLAY CO LTD

AI summary

An electroluminescent display device includes: a substrate including a subpixel; a thin film transistor disposed at the subpixel; an overcoat layer disposed on the thin film transistor; a first electrode disposed on the overcoat layer and electrically connected to the thin film transistor; a bank layer disposed on the overcoat layer and the first electrode, the bank layer including a plurality of openings configured to expose the first electrode and a plurality of opening patterns formed in a bar shape to expose the first electrode and connect the plurality of openings; an emitting layer disposed on the first electrode and the bank layer; and a second electrode disposed on the emitting layer.