Display Element Function Layer Siloxane Phenylamine

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Solution Overview

Problem

The luminance of display elements in display devices decreases over time, leading to a short lifetime, necessitating improvements to suppress this decrease and extend the lifespan.

Innovation Solution

A display element with a function layer containing a phenylamine-based compound and a compound with a siloxane skeleton, which can be formed as a co-evaporation film, is used to suppress luminance decrease and extend the lifetime by preventing moisture penetration and improving adhesion and humidity resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of stationary object

If a display element uses conventional sealing material, then the device can be manufactured, but the luminance decreases over time and lifetime is short

Engineering Contradiction:

ImprovelifetimeVSAvoidluminance

Core Design Contradiction:

Duration of action of stationary objectVSIllumination intensity

Solution Approach 1:

The patent uses a composite function layer containing both a phenylamine-based compound and a siloxane compound, combining the moisture barrier properties of siloxane with the charge transport capabilities of phenylamine to simultaneously protect against environmental degradation and maintain electrical function, thereby extending lifetime while preserving luminance

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The function layer acts as an intermediary between the cathode and the sealing material, providing both adhesion and moisture barrier functions. This intermediate layer prevents moisture penetration to the cathode while maintaining electrical contact, solving the contradiction between sealing effectiveness and electrical performance

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the function layer uses materials with good adhesion, then lifetime is extended, but moisture penetration may occur

Engineering Contradiction:

ImproveadhesionVSAvoidmoisture penetration

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The function layer combines siloxane compound (providing moisture barrier properties) with phenylamine-based compound (providing adhesion and charge transport), creating a composite material that simultaneously achieves both good adhesion and moisture resistance without compromising either function

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS20230329088A1Display element

Publication Date: 2023.10.12 SHARP KK

AI summary

Provided is a display element having a function layer containing a phenylamine-based compound and a compound having a siloxane skeleton.