Continuous Light Emission Layer for OLED Display Uniformity

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Solution Overview

Problem

Display units with organic electroluminescence elements face challenges in providing sufficient light from light emission regions while minimizing display unevenness and optical diffraction failures, particularly in high-definition applications.

Innovation Solution

The display unit incorporates a light emission layer that is continuously provided across both light emission and non-light emission regions within each pixel, with a partition wall separating adjacent pixels, allowing for even light extraction and reduced thickness variations in the light emission layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a light emission unit has high definition with a light transmission region, then light extraction efficiency is improved, but optical diffraction failure occurs

Engineering Contradiction:

Improvelight extraction efficiencyVSAvoidoptical diffraction failure

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The pixel electrode is divided into a light emission region and a light transmission region, with the light transmission region further segmented into multiple areas arranged in an alternating pattern. This segmentation prevents large continuous transparent areas that cause optical diffraction, while still providing sufficient light transmission capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the pixel electrode are assigned different properties: the light emission region has high light extraction efficiency, while the light transmission region is designed with specific patterns to prevent optical diffraction. The alternating arrangement of light transmission regions creates local variations that mitigate diffraction effects.

Inventive Principle:

Principle #3Local quality

2Ease of manufacture

If the light emission layer has large thickness variations, then manufacturing is easier, but display unevenness increases

Engineering Contradiction:

Improvelight emission layer thickness controlVSAvoiddisplay unevenness

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The partition wall is formed in advance before forming the light emission layer. This preliminary structure provides a physical guide that ensures the light emission layer is formed with uniform thickness, preventing display unevenness while maintaining ease of manufacturing.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The partition wall acts as an intermediary structure between the substrate and the light emission layer. It provides a standardized template that ensures uniform thickness of the light emission layer, thereby reducing display unevenness without complicating the manufacturing process.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If the light emission region has small area, then pixel density increases, but light output becomes insufficient

Engineering Contradiction:

Improvepixel densityVSAvoidlight output

Core Design Contradiction:

ProductivityVSIllumination intensity

Solution Approach 1:

The light transmission region is designed with an alternating pattern arrangement that extends in multiple directions. This dimensional arrangement increases the effective light transmission area without increasing the overall pixel footprint, thereby maintaining high pixel density while ensuring sufficient light output.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 enhances light extraction efficiency, reduces display unevenness, and mitigates optical diffraction issues, ensuring a sufficient and uniform light output from each pixel, particularly in high-definition displays.

Implementation Method 1

various types of light emission units using an organic electro luminescence element have been developed

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 2

Light that is generated by the light emission element is extracted from the light emission region

Methodology Applied

Scientific EffectLight extraction:

Data Source

PatentUS11217641B2Display unit and light emission unit

Publication Date: 2022.01.04 MAGNOLIA BLUE CORP

AI summary

A display unit includes multiple pixels, a first electrode, a partition wall, a light emission layer, and a second electrode. The multiple pixels each have a light emission region and a non-light emission region along a first direction. The first electrode is provided in the light emission region in each of the multiple pixels. The partition wall is provided between each two of the pixels that are adjacent to each other in a second direction. The second direction intersects the first direction. The light emission layer covers the first electrode and is provided in the light emission region and the non-light emission region in a continuous manner. The second electrode faces the first electrode across the light emission layer.