Partition Wall Prevents Organic Material Flow in EL Display

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Solution Overview

Problem

In organic electroluminescence (EL) display devices, there is a concern that organic materials may flow from the pixel region to the non-forming regions, such as terminal or sealing regions, during the manufacturing process, leading to yield and reliability issues.

Innovation Solution

A display device design that includes a first substrate with a partitioning wall between the organic layer forming region and the non-forming region, preventing organic material from flowing into these areas during film formation, thereby maintaining the integrity of the organic layer in the intended regions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a printing method is used to form an organic layer in the pixel region, then the organic layer can be formed with precise patterning, but organic material may flow into the organic layer non-forming region, causing yield and reliability deterioration

Engineering Contradiction:

Improveorganic layer patterning precisionVSAvoiddevice yield and reliability

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The substrate surface is segmented into distinct regions by partition walls: an organic layer forming region where organic material is intentionally deposited, and an organic layer non-forming region where organic material should not be present. The partition walls create physical separation between these regions, preventing unwanted material flow while allowing precise patterning in the forming region.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Partition walls act as intermediary structures between the organic layer forming region and the non-forming region. These walls serve as barriers that intercept and contain organic material during the deposition process, preventing it from reaching the non-forming region while not interfering with the formation process in the intended region.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If organic material is deposited in the pixel region, then the display function is achieved, but organic material may attach to the organic layer non-forming region, compromising device integrity

Engineering Contradiction:

Improvedisplay device manufacturing efficiencyVSAvoidorganic material placement accuracy

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The substrate is divided into functionally distinct zones using partition walls, enabling simultaneous optimization of productivity and precision. The forming region allows efficient material deposition while the partitioned non-forming region ensures high placement accuracy by preventing contamination, thus achieving both manufacturing efficiency and precision.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the substrate are given different functional qualities: the organic layer forming region is designed to receive and retain organic material for display functionality, while the organic layer non-forming region is designed to remain free of organic material for electrical connection integrity. The partition walls enforce this local quality differentiation.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS9484394B2Display device and electronic apparatus

Publication Date: 2016.11.01 MAGNOLIA BLUE CORP

AI summary

A display device includes a first substrate including an organic layer forming region, and an organic layer non-forming region which is provided on an outer side of the organic layer forming region; and a first partitioning wall which is provided between the organic layer forming region and the organic layer non-forming region on the first substrate.