Encapsulation Layer Carbon Silicon Ratios OLED Moisture

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Solution Overview

Problem

Organic light emitting display devices are vulnerable to moisture and oxygen infiltration, leading to defects such as dark spots and pixel shrinkage, which compromises their reliability.

Innovation Solution

A display device with an encapsulation structure comprising a first inorganic encapsulation layer, a first organic layer with a specific atomic ratio of carbon to silicon, and a second organic layer with a different atomic ratio, sealed by a second inorganic encapsulation layer, formed through a continuous process to enhance adhesive characteristics and prevent moisture and oxygen infiltration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single-layer organic encapsulation layer is used, then the device structure is simple, but the adhesive characteristics between layers are insufficient leading to interfacial separation

Engineering Contradiction:

Improveencapsulation structureVSAvoidadhesive characteristics

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The encapsulation structure is divided into multiple organic layers (first organic layer, second organic layer, third organic layer) with distinct carbon-to-silicon atomic ratios. This segmentation allows each layer to contribute differently to adhesion and barrier properties, resolving the contradiction between structural simplicity and adhesive reliability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each organic layer is assigned a specific local quality in terms of carbon-to-silicon atomic ratio (first layer: 1.1-1.3, second layer: 1.3-1.5, third layer: 1.5-1.7). This local differentiation optimizes adhesion at each interface while maintaining overall encapsulation integrity, addressing the adhesive characteristics issue without excessive complexity.

Inventive Principle:

Principle #3Local quality

2Device complexity

If the organic light emitting device is exposed to external environment, then the device structure is simple, but moisture and oxygen infiltration causes deterioration and defects

Engineering Contradiction:

Improveencapsulation structureVSAvoidmoisture and oxygen infiltration

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The encapsulation structure combines multiple organic layers with different compositions (varying carbon-to-silicon ratios) to create a composite barrier system. This composite structure provides enhanced protection against moisture and oxygen infiltration while maintaining reasonable structural complexity.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The encapsulation structure employs a nested multi-layer configuration where the first, second, and third organic layers are stacked sequentially, each providing an additional barrier layer. This nested arrangement enhances protection against harmful external factors without requiring a single overly complex structure.

Inventive Principle:

Principle #7Nested doll (Nesting)

3Ease of manufacture

If layers are formed through separate processes, then each layer can be optimized independently, but the adhesive characteristics between layers deteriorate

Engineering Contradiction:

Improvelayer formation flexibilityVSAvoidadhesive characteristics

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The formation of multiple organic layers with different carbon-to-silicon ratios is integrated into a single continuous deposition process. This merging of process steps ensures good interfacial adhesion between layers while still allowing independent optimization of each layer's composition, resolving the contradiction between manufacturing flexibility and adhesive reliability.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The continuous deposition process maintains uninterrupted formation of the encapsulation layers, ensuring continuous adhesion between layers with different compositions. This continuity prevents defects that would arise from separate process interruptions while preserving the ability to optimize each layer's carbon-to-silicon ratio independently.

Inventive Principle:

Principle #20Continuity of useful action

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

The encapsulation structure effectively seals the organic light emitting device, improving its reliability by preventing external contamination and enhancing the adhesive properties between layers, thereby reducing defects and increasing the device's stability.

Implementation Method 1

The encapsulation structure includes a first inorganic encapsulation layer, a first organic layer, a second organic layer, and a second inorganic encapsulation layer... preventing external contamination

Methodology Applied

Scientific EffectBarrier effect:

Data Source

PatentUS10873046B2Display device with encapsulation layer with varying ratios of carbon to silicon and oxygen to silicon and method of fabricating the same

Publication Date: 2020.12.22 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes a organic light emitting device and an encapsulation structure disposed on the organic light emitting device that seals the organic light emitting device. The encapsulation structure includes a first inorganic encapsulation layer disposed on the organic light emitting device, an organic layer disposed on the first inorganic encapsulation layer, and a second inorganic encapsulation layer disposed on the organic layer. The organic layer includes a first organic layer disposed on the first inorganic encapsulation layer and a second organic layer disposed on the first organic layer. An atomic ratio of carbon to silicon in the first organic layer is less than an atomic ratio of carbon to silicon in the second organic layer.