Ion Blocking Layer Shields Active Layer in OLED TFTs

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Solution Overview

Problem

Organic light-emitting display devices face deterioration of the active layer in thin-film transistors due to sensitivity to external ions during manufacturing, affecting the reliability of the devices.

Innovation Solution

Incorporating an ion blocking layer made of conductive material, such as zinc oxide or gallium-indium-zinc oxide, over the active layer of thin-film transistors to prevent ion exposure and deterioration, which is formed simultaneously with the first electrode using mask patterns to ensure electrical insulation and protection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the active layer is exposed during manufacturing, then the manufacturing process is simpler, but the active layer deteriorates due to external ions

Engineering Contradiction:

Improvemanufacturing process simplicityVSAvoidactive layer reliability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

An ion blocking layer is formed over the active layer before subsequent manufacturing steps to prevent ion exposure and deterioration during the manufacturing process

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The ion blocking layer acts as an intermediary protective barrier between the active layer and external ions, allowing the manufacturing process to proceed while protecting the sensitive active layer

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If an ion blocking layer is added to protect the active layer, then the active layer reliability is improved, but the device structure becomes more complex

Engineering Contradiction:

Improveactive layer reliabilityVSAvoiddevice structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The ion blocking layer is designed to serve multiple functions: preventing ion exposure, providing electrical insulation, and maintaining structural integrity, thereby justifying the additional layer through its multifunctional benefits

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Manufacturing precision

If the ion blocking layer and first electrode are formed separately, then the manufacturing precision is improved, but the manufacturing time increases

Engineering Contradiction:

Improveformation precisionVSAvoidmanufacturing time

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The ion blocking layer and first electrode are formed simultaneously in a single manufacturing step, reducing overall manufacturing time while maintaining the precision required for both components through careful process design

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS8592809B2Organic light-emitting display device and method of manufacturing the same

Publication Date: 2013.11.26 SAMSUNG DISPLAY CO LTD

AI summary

An organic light-emitting display device includes a substrate, a plurality of thin-film transistors on the substrate, each thin-film transistor including an active layer, a planarization layer on the thin-film transistors, a first electrode on the planarization layer and electrically connected to a thin-film transistor, and an ion blocking layer on the planarization layer, the ion blocking layer overlapping the active layer.