Organic Light Emitting Display Panel Layer Configuration

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Solution Overview

Problem

Organic light emitting display panels face issues with color mixing due to misalignment of organic light emitting layers during manufacturing, leading to unwanted light emission in non-intended areas.

Innovation Solution

The organic light emitting display panel is designed with specific layer configurations and manufacturing methods that include a base substrate with distinct light emitting areas and a non-light emitting area, featuring multiple electrodes, hole injection layers, hole transport layers, and light emitting layers, where the layers are strategically misaligned to prevent light emission in certain areas, thereby preventing color mixing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If organic light emitting layers are formed in different portions of light emitting areas, then display color variety is improved, but color mixing occurs due to layer interference between adjacent portions

Engineering Contradiction:

Improvedisplay color varietyVSAvoidcolor mixing

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The light emitting area is divided into multiple portions, with each portion containing organic light emitting layers of different materials. By segmenting the display area and assigning different emitting materials to different segments, the patent achieves color variety while preventing color mixing through the non-light emitting area boundaries that separate these segments.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the light emitting area are assigned different organic light emitting layer materials to emit different colors. Each local region has optimized properties for its intended color emission, with the non-light emitting area acting as a boundary that maintains local quality purity and prevents interference between adjacent color regions.

Inventive Principle:

Principle #3Local quality

2Ease of manufacture

If light emitting layers are disposed to overlap with adjacent light emitting areas, then manufacturing process is simplified, but unwanted light emission occurs in non-intended areas

Engineering Contradiction:

Improvemanufacturing process simplicityVSAvoidlight emission control precision

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent converts the potential harm of layer overlap and misalignment into a beneficial feature by designing the non-light emitting area to strategically receive and contain any light emission from misplaced layers. This ensures that even if layers overlap into adjacent areas, the light is confined to non-intended areas that do not affect display quality.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The non-light emitting area serves as a pre-designed buffer zone that anticipates and absorbs potential manufacturing variations. By providing this cushioning area beforehand, the patent prevents unwanted light emission from affecting intended display areas, thereby maintaining manufacturing precision without requiring extremely tight tolerances.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Reliability

If multiple organic light emitting layers with different materials are used, then display quality is improved, but manufacturing complexity increases due to precise alignment requirements

Engineering Contradiction:

Improvedisplay qualityVSAvoidmanufacturing process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The non-light emitting area acts as an intermediary buffer zone between adjacent light emitting portions. This intermediary structure simplifies the manufacturing process by eliminating the need for precise alignment between different organic light emitting layers, as any misalignment is absorbed by the buffer zone rather than causing color mixing or display defects.

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 ensures that only intended light emitting layers generate light, preventing color mixing and enhancing display quality by controlling light emission effectively.

Implementation Method 1

Each pixel includes an organic light emitting diode. The organic light emitting diode generally includes two electrodes and an organic light emitting layer disposed between the two electrodes.

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS8952370B2Organic light emitting display panel and method of manufacturing the same

Publication Date: 2015.02.10 SAMSUNG DISPLAY CO LTD

AI summary

An organic light emitting display panel includes a first pixel and a second pixel respectively disposed in first and second light emitting areas. A portion of a first hole transport layer and a portion of a first light emitting layer of the first pixel are disposed in the second light emitting area. The portions of the first hole transport layer and the first light emitting layer overlap a second hole transport layer and a second light emitting layer, which are successively stacked. The second hole transport layer and the second light emitting layer block holes and electrons from moving to the portion of the first light emitting layer.