Display Device Conductive Layer Reflectance and Insulation
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Solution Overview
Problem
Organic EL elements with stacked-layer structures of multiple layers face reliability issues due to potential reactions between layers, leading to electrode quality degradation and reduced display device performance.
Innovation Solution
A display device design featuring a first and second light-emitting element with specific conductive layer structures, where the second conductive layer covers the upper and side surfaces of the first conductive layer, and both have distinct visible light reflectance properties, along with insulating layers to prevent chemical reactions and ensure high reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a stacked-layer structure of multiple layers containing different materials is used in an organic EL element, then the functional requirements of the light-emitting element can be met, but reactions may occur between the layers causing electrode quality degradation and reduced reliability
Solution Approach 1:
An insulating layer is introduced between adjacent light-emitting elements as an intermediary barrier. This insulating layer prevents direct contact and potential chemical reactions between the stacked layers of different materials from neighboring elements, thereby maintaining electrode quality and reliability while preserving the functional benefits of the stacked-layer structure.
Solution Approach 2:
The problematic interaction interface between stacked layers of adjacent elements is extracted and isolated by removing the direct contact possibility. The insulating layer effectively extracts the harmful reaction pathway by separating the potentially reactive layers from different elements, allowing each element to maintain its functional integrity without degradation.
2Loss of energy
If the visible light reflectance of the first conductive layer is made higher than that of the second conductive layer, then light extraction efficiency is improved, but the complexity of material selection and layer design increases
Solution Approach 1:
Different reflectance properties are assigned to different conductive layers based on their specific functional requirements and positions within the light-emitting element structure. The first conductive layer is designed with higher visible light reflectance optimized for its specific role in light extraction, while the second conductive layer has different reflectance characteristics suited to its function, allowing each layer to be optimized locally rather than requiring uniform properties throughout.
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 solution enhances the reliability and efficiency of the display device by preventing electrode degradation, improving light extraction efficiency, reducing power consumption, and maintaining high display quality and resolution.
Implementation Method 1
The visible light reflectance of the first conductive layer is higher than the visible light reflectance of the second conductive layer. The visible light reflectance of the third conductive layer is higher than the visible light reflectance of the fourth conductive layer.
Data Source
AI summary
A highly reliable display device is provided. The display device includes a first light-emitting element, a second light-emitting element adjacent to the first light-emitting element, a first insulating layer provided between the first light-emitting element and the second light-emitting element, and a second insulating layer over the first insulating layer. The first light-emitting element includes a first conductive layer, a second conductive layer covering an upper surface and a side surface of the first conductive layer, a first EL layer covering an upper surface and a side surface of the second conductive layer, and a common electrode over the first EL layer. The second light-emitting element includes a third conductive layer, a fourth conductive layer covering an upper surface and a side surface of the third conductive layer, a second EL layer covering an upper surface and a side surface of the fourth conductive layer, and the common electrode over the second EL layer. The common electrode is provided over the second insulating layer. The visible light reflectance of the first conductive layer is higher than the visible light reflectance of the second conductive layer. The visible light reflectance of the third conductive layer is higher than the visible light reflectance of the fourth conductive layer.