3D Mesh Hole Transport Layer for Solvent-Resistant Displays

Solution Overview

Problem

Organic hole transport layers with no 3D mesh structure have inadequate solvent resistance, while inorganic layers lack satisfactory hole transport characteristics, leading to peeling issues during processing.

Innovation Solution

A light-emitting element with a hole transport layer containing a first hole transport material with a 3D mesh structure and thermosetting functional groups, combined with a second hole transport material for improved solvent resistance and transport characteristics, is used in a display device.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an organic hole transport layer formed of high molecular material with hole transportability but no 3D mesh structure is used, then hole transport characteristic is improved, but solvent resistance characteristic deteriorates

Engineering Contradiction:

Improvehole transport characteristicVSAvoidsolvent resistance characteristic

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent creates a composite hole transport layer combining organic high molecular material (for hole transport) with inorganic material forming a 3D mesh structure (for solvent resistance). This composite structure allows both materials to contribute their respective advantages, resolving the contradiction between hole transportability and solvent resistance.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies different materials with specific properties to different functional requirements within the hole transport layer. The inorganic material forms a 3D mesh structure specifically to provide solvent resistance, while the organic material provides hole transport pathways. Each material is positioned and structured to optimize its local function.

Inventive Principle:

Principle #3Local quality

2Stability of the object's composition

If an inorganic hole transport layer is used, then solvent resistance characteristic is improved, but hole transport characteristic deteriorates

Engineering Contradiction:

Improvesolvent resistance characteristicVSAvoidhole transport characteristic

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent creates a composite hole transport layer combining organic high molecular material (for hole transport) with inorganic material forming a 3D mesh structure (for solvent resistance). This composite structure allows both materials to contribute their respective advantages, resolving the contradiction between hole transportability and solvent resistance.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent segments the hole transport layer into two functional components: an organic phase for charge transport and an inorganic 3D mesh phase for structural stability and solvent resistance. This segmentation allows each component to specialize in its optimal function without compromising the other.

Inventive Principle:

Principle #1Segmentation

3Ease of manufacture

If an organic hole transport layer with no 3D mesh structure is used, then manufacturing simplicity is maintained, but peeling occurs during processing

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidadhesion strength

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The patent creates a composite hole transport layer combining organic high molecular material (for hole transport) with inorganic material forming a 3D mesh structure (for solvent resistance). This composite structure allows both materials to contribute their respective advantages, resolving the contradiction between hole transportability and solvent resistance.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent employs a thin film inorganic material to form a 3D mesh structure within the organic hole transport layer. This thin film network provides mechanical reinforcement and adhesion without significantly increasing thickness or complicating the manufacturing process, preventing peeling during subsequent processing steps.

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

The solution provides a hole transport layer with enhanced solvent resistance and transport characteristics, ensuring the integrity of the display device during processing and operation.

Implementation Method 1

molecules including a hole-transportability skeleton and at least two thermosetting functional groups being joined together to constitute a high molecule

Methodology Applied

Scientific EffectCondensation: Condensation

Implementation Method 2

a heat treatment to join together the plurality of molecules including the hole-transportability skeleton and the at least two thermosetting functional groups

Methodology Applied

Scientific EffectHeating: Heating

Data Source

PatentUS12538639B2Light-emitting element, display device, and method for manufacturing display device

Publication Date: 2026.01.27 SHARP DISPLAY TECHNOLOGY CORP

AI summary

A light-emitting element includes a first electrode, a hole transport layer formed on the first electrode, a light-emitting layer formed on the hole transport layer, and a second electrode formed on the light-emitting layer, wherein the hole transport layer contains a first hole transport material having a 3D mesh structure with molecules including a hole-transportability skeleton and at least two thermosetting functional groups being joined together to constitute a high molecule and contains a second hole transport material including a plurality of molecules having hole transportability.