Display Device Electron-Injection Layer Projection Gap Design
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Solution Overview
Problem
Current display devices face challenges in achieving high-quality image display, high light extraction efficiency, high aperture ratio, high resolution, affordability, and reliability, particularly in applications like virtual reality and augmented reality where high performance is required.
Innovation Solution
A display device design featuring a structure with first and second light-emitting elements and a gap between them, where the electron-injection layers project from the side surfaces of the light-emitting layers, and the gap contains gases like nitrogen or carbon dioxide, enhancing light extraction and aperture ratio while maintaining a simple manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the gap between light-emitting elements is reduced to increase aperture ratio, then light extraction efficiency deteriorates due to increased total internal reflection
Solution Approach 1:
The patent introduces a gap filled with gas (nitrogen, carbon dioxide, or air) as an intermediary medium between adjacent light-emitting elements. This gas-filled gap has a lower refractive index than the light-emitting layers, reducing total internal reflection at the interfaces and improving light extraction efficiency while maintaining a small physical gap distance for high aperture ratio.
Solution Approach 2:
The patent changes the refractive index parameter of the gap medium by filling it with gas having a lower refractive index than the light-emitting layers. This parameter change reduces the refractive index difference at the interfaces, thereby reducing total internal reflection and improving light extraction efficiency without increasing the gap size.
2Loss of energy
If electron-injection layers are made to project from side surfaces to improve light extraction, then manufacturing complexity increases
Solution Approach 1:
The patent merges the electron-injection layer formation process with the light-emitting element structure by having the electron-injection layers continuously extend over the light-emitting layers and into the gap region. This integrated structure improves light extraction through side surfaces while using a single continuous layer deposition process, avoiding additional manufacturing steps.
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 enables the display device to achieve high-quality image display with high light extraction efficiency, high resolution, and a high aperture ratio, while being cost-effective and reliable, suitable for demanding applications like VR and AR.
Implementation Method 1
adjacent light-emitting elements are isolated from each other by a gap, light emitted in the oblique direction from the light-emitting element can be totally reflected by the gap
Implementation Method 2
Light emitted in the oblique direction from the light-emitting element can be totally reflected by the gap
Implementation Method 3
light-emitting elements (also referred to as EL elements or EL devices) utilizing an electroluminescence (hereinafter referred to as EL) phenomenon
Data Source
AI summary
A display device capable of high-quality images can be provided. The display device includes a first light-emitting element, a second light-emitting element, and a gap. The first light-emitting element includes a first light-emitting layer and a first electron-injection layer over the first light-emitting layer, and the second light-emitting element includes a second light-emitting layer and a second electron-injection layer over the second light-emitting layer. The first light-emitting element is adjacent to the second light-emitting element. The gap is placed between the first electron-injection layer and first light-emitting layer and the second electron-injection layer and second light-emitting layer. The first electron-injection layer comprises a region projecting from the side surface of the first light-emitting layer, and the second electron-injection layer comprises a region projecting from the side surface of the second light-emitting layer.