Top-Emission Display Electrode Nanoparticle Layer for Light Extraction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing top-emission display devices suffer from low efficiency in releasing light from the light-emitting layer.
Innovation Solution
Incorporating a nanoparticle layer made of electrically conductive metal oxide nanoparticles on the surface of the first electrode towards the light-emitting layer, and forming it using a solution droplet delivery method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a top-emission display device structure is used with a light-reflective first electrode and light-transparent second electrode, then the device can emit light toward the second electrode, but the efficiency in releasing light from the light-emitting layer is low
Solution Approach 1:
A nanoparticle layer containing metal oxide nanoparticles is introduced as an intermediary between the first electrode and the light-emitting layer. This nanoparticle layer serves as a mediator to enhance charge injection from the electrode into the light-emitting layer, thereby improving light release efficiency and reducing energy loss.
Solution Approach 2:
The introduction of metal oxide nanoparticles changes the electrical and optical parameters of the interface between the electrode and light-emitting layer. The nanoparticles modify charge transport properties and reduce resistance, leading to improved light emission efficiency.
2Illumination intensity
If the first electrode is made of light-reflective material, then light can be directed toward the second electrode, but charge injection efficiency is reduced
Solution Approach 1:
The nanoparticle layer acts as an intermediary that bridges the light-reflective first electrode and the light-emitting layer. It maintains the light-reflective property of the electrode while providing improved charge injection capability through the metal oxide nanoparticles, thus resolving the conflict between light emission intensity and charge injection efficiency.
Solution Approach 2:
The first electrode structure is enhanced by combining light-reflective material with metal oxide nanoparticles in a composite configuration. This composite structure simultaneously achieves both light reflection and improved charge injection properties that neither material could provide alone.
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
Improves the efficiency of light release from the light-emitting layer by enhancing charge injection and reducing resistance.
Implementation Method 1
containing metal oxide nanoparticles that are electrically conductive
Implementation Method 2
a light-emitting layer, and a second electrode... the light from the light-emitting layer is emitted
Data Source
AI summary
A display device includes a light-emitting-element layer including a plurality of light-emitting elements each including a first electrode, a functional layer, and a second electrode. The plurality of light-emitting elements are formed to emit lights in different colors. A nanoparticle layer is provided on a surface of the first electrode toward a light-emitting layer, and contains metal oxide nanoparticles that are electrically conductive.