Wearable Display Charge Generation Layer Short Circuit Prevention

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Solution Overview

Problem

Existing display devices and wearable electronic devices face reliability issues due to potential short circuits between the cathode electrode and the charge generation layer in the non-display areas.

Innovation Solution

The proposed solution involves a display device structure where the second light emitting part, which includes organic patterns in the display area and dummy patterns in the non-display area, completely covers the charge generation layer. This separation prevents short circuits and enhances reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the charge generation layer is extended into the non-display area to improve charge extraction, then charge generation efficiency is improved, but the risk of short circuit between cathode electrode and charge generation layer increases

Engineering Contradiction:

Improveshort circuit preventionVSAvoidlayer structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The light emitting element layer is divided into first light emitting part (in display area) and second light emitting part (in non-display area), with the charge generation layer positioned between them. This segmentation allows the charge generation layer to extend into the non-display area for improved charge extraction while the second light emitting part acts as a separator to prevent short circuits between the cathode electrode and charge generation layer.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The second light emitting part serves as an intermediary layer between the charge generation layer and the cathode electrode. This intermediary structure prevents direct contact between the charge generation layer and cathode electrode, eliminating the short circuit risk while allowing the charge generation layer to extend into the non-display area for enhanced charge extraction efficiency.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If dummy patterns are added in the non-display area to cover the charge generation layer, then short circuit prevention is improved, but manufacturing complexity increases

Engineering Contradiction:

Improveshort circuit preventionVSAvoidmanufacturing process simplicity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The second light emitting part is formed by combining second organic patterns (in display area) and dummy patterns (in non-display area) into a single continuous layer. This merging approach allows the charge generation layer to extend into the non-display area while the combined second light emitting part provides comprehensive coverage to prevent short circuits, all formed through integrated manufacturing processes.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If the second light emitting part covers the charge generation layer in the non-display area, then short circuit risk is reduced, but the device thickness increases

Engineering Contradiction:

Improveelectrical isolationVSAvoiddevice thickness

Core Design Contradiction:

ReliabilityVSLength of moving object

Solution Approach 1:

The second light emitting part is formed as a thin film structure using organic patterns that can be deposited in extremely thin layers. This thin film approach provides sufficient electrical isolation to prevent short circuits between the charge generation layer and cathode electrode while minimizing the increase in overall device thickness.

Inventive Principle:

Principle #30Flexible shells and thin films

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 effectively prevents short circuits between the cathode electrode and the charge generation layer, thereby improving the reliability and durability of the display device and wearable electronic devices.

Implementation Method 1

first organic patterns emitting light; second organic patterns emitting light

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS20250143158A1Display device and wearable electronic device

Publication Date: 2025.05.01 SAMSUNG DISPLAY CO LTD

AI summary

A light emitting element layer of a display device is disposed on a base layer. A first light emitting part of the light emitting element layer includes first organic patterns emitting light, a charge generation layer is disposed on the first light emitting part, and a second light emitting part is disposed on the charge generation layer. The second light emitting part covers the charge generation layer in a plan view. The second light emitting part includes second organic patterns disposed in a display area and emitting light and dummy patterns disposed in a non-display area.