Display Panel Structure for Low-Voltage Emission Without Alkali Metals

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Solution Overview

Problem

Existing display panel manufacturing methods require the use of alkali metals, which can contaminate manufacturing facilities and increase driving voltage, and there is a need for a more reliable and convenient display panel structure.

Innovation Solution

A display panel design incorporating first and second light-emitting devices separated by a partition wall, with specific organic compounds and metals forming a singly occupied molecular orbital (SOMO), and using hole-transport materials and acceptor substances to reduce driving voltage and prevent crosstalk, without the need for alkali metals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If alkali metals are used in the light-emitting layer, then the driving voltage is reduced, but the manufacturing facilities are contaminated

Engineering Contradiction:

Improvedriving voltageVSAvoidcontamination of manufacturing facilities

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The patent extracts and removes alkali metals from the light-emitting layer composition. By formulating a light-emitting layer that achieves low driving voltage without alkali metals, the source of contamination is eliminated while maintaining the electrical performance benefits

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces an electron-injection layer as an intermediary between the cathode and light-emitting layer. This layer facilitates electron injection and helps achieve low driving voltage without requiring alkali metals in the light-emitting layer, thus preventing contamination while maintaining electrical performance

Inventive Principle:

Principle #24Intermediary (Mediator)

2Use of energy by moving object

If alkali metals are used in the light-emitting layer, then the driving voltage is reduced, but the reliability is compromised

Engineering Contradiction:

Improvedriving voltageVSAvoiddevice reliability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent removes alkali metals from the light-emitting layer to eliminate reliability issues associated with their use, while simultaneously achieving low driving voltage through alternative material formulations and device结构设计

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent employs composite material formulations in the light-emitting layer, combining multiple organic compounds and metals (such as aluminum qe complex and BPhen) to achieve both low driving voltage and high reliability without relying on alkali metals

Inventive Principle:

Principle #40Composite materials

3Reliability

If partition walls are added to separate light-emitting devices, then crosstalk is prevented, but the device complexity increases

Engineering Contradiction:

Improveprevention of crosstalkVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent divides the display into separate light-emitting devices using partition walls. This segmentation prevents crosstalk between adjacent devices by providing physical isolation, while the modular approach allows for systematic manufacturing

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The partition walls are implemented as thin film structures that provide effective separation between light-emitting devices. These thin film partition walls achieve crosstalk prevention with minimal addition to device complexity and 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

The proposed structure reduces driving voltage, prevents contamination of manufacturing facilities, and ensures reliable separation of adjacent light-emitting devices, resulting in a highly convenient and useful display panel.

Implementation Method 1

the first organic compound and the first metal form a singly occupied molecular orbital (SOMO)

Methodology Applied

Scientific EffectSingly occupied molecular orbital (SOMO) formation:

Data Source

PatentUS12527190B2Display panel with a reduced driving voltage without using an alkali metal

Publication Date: 2026.01.13 SEMICON ENERGY LAB CO LTD

AI summary

A novel display panel is provided. The display panel includes a first light-emitting device, a second light-emitting device, and a partition wall. The first light-emitting device includes a first electrode, a second electrode, and a first layer sandwiched therebetween. The first layer contains a first organic compound and a first metal. The first organic compound includes an unshared electron pair. The first metal belongs to Group 5, Group 7, Group 9, Group 11, or Group 13. The second light-emitting device includes a third electrode, a fourth electrode, and a second layer sandwiched therebetween. The second layer contains the first organic compound and the first metal. A first space is provided between the second layer and the first layer. The partition wall has a first opening and a second opening. The partition wall overlaps with the first space between the first opening and the second opening.