OLED Capping Layer with UV Interception Materials

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Solution Overview

Problem

Organic light emitting diode (OLED) display devices are vulnerable to ultraviolet (UV) rays and moisture, which shortens their lifespan.

Innovation Solution

An OLED display device is designed with a capping layer containing UV interception materials like zinc oxide, titanium oxide, and magnesium oxide, which intercepts external UV rays and prevents moisture from reaching the organic light emission layer, thereby protecting it.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the organic light emission layer is exposed to UV rays and moisture, then the OLED display device can operate initially, but the lifespan of the device is shortened

Engineering Contradiction:

ImprovelifespanVSAvoidUV ray damage and moisture exposure

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a capping layer as an intermediary component between the organic light emission layer and the external environment. This capping layer contains UV interception materials (such as zinc oxide, titanium oxide, iron oxide, or magnesium oxide) that block UV rays and prevent moisture from reaching the organic light emission layer, thereby protecting it from degradation while allowing the device to function

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The capping layer is constructed using composite materials that combine UV interception materials with organic or inorganic film materials. The UV interception materials (zinc oxide, titanium oxide, iron oxide, magnesium oxide) are integrated into the capping layer structure, creating a composite material that provides both protective functionality and structural integrity

Inventive Principle:

Principle #40Composite materials

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 capping layer effectively extends the lifespan of the OLED display device by shielding it from UV damage and moisture, maintaining its performance and longevity.

Implementation Method 1

a capping layer positioned on the second electrode to cover the organic light emission layer and including an ultraviolet (UV) interception material intercepting UV rays irradiated to the organic light emission layer from the exterior of the OLED display device

Methodology Applied

Scientific EffectUV interception: Absorption (EM radiation)

Implementation Method 2

a capping layer positioned on the second electrode to cover the organic light emission layer

Methodology Applied

Scientific EffectPhysical containment: Physical Containment

Data Source

PatentUS9224978B2Organic light emitting diode display device

Publication Date: 2015.12.29 SAMSUNG DISPLAY CO LTD

AI summary

An organic light emitting diode (OLED) display device includes a first substrate; a first electrode positioned on the first substrate; an organic light emission layer positioned on the first electrode; a second electrode positioned on the organic light emission layer; and a capping layer positioned on the second electrode to cover the organic light emission layer and including an ultraviolet (UV) interception material intercepting UV rays irradiated to the organic light emission layer from the exterior.