Display Device Insulating Layer Side Surface Coverage
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Solution Overview
Problem
Existing display devices face challenges in maintaining high yield and reliability due to potential electrode quality changes caused by reactions between layers in stacked-layer structures, leading to decreased display quality and increased defects.
Innovation Solution
A display device structure comprising a first conductive layer, a second conductive layer, a third conductive layer, an insulating layer, a functional layer, and a light-emitting layer, where the second conductive layer is positioned between the first and third conductive layers, and the insulating layer covers part of the second conductive layer's side surface, enhancing coverage and preventing corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a stacked-layer structure of multiple conductive layers is used, then the display device can achieve higher resolution and better display quality, but the electrode quality may change due to reactions between layers, decreasing yield and reliability
Solution Approach 1:
An insulating layer is introduced as an intermediary between the first conductive layer and the second conductive layer. This insulating layer prevents direct contact and chemical reactions between the conductive layers, thereby maintaining electrode quality stability while allowing the stacked-layer structure to achieve high display quality
Solution Approach 2:
The conductive structure is segmented into multiple independent conductive layers (first conductive layer, second conductive layer, third conductive layer) separated by insulating layers. This segmentation prevents harmful interactions between layers while maintaining the functional benefits of the stacked structure for high-resolution display
2Area of moving object
If the second conductive layer is positioned between the first and third conductive layers, then the aperture ratio is increased, but the side surface coverage may be insufficient, leading to corrosion and defects
Solution Approach 1:
The insulating layer extends not only horizontally but also vertically to cover the side surface of the second conductive layer. This three-dimensional coverage prevents corrosion at the side surfaces while maintaining the aperture ratio benefit of the positioned conductive layers
Solution Approach 2:
The insulating layer acts as a protective intermediary that covers the side surfaces of the conductive layers, preventing direct exposure to corrosive environments and maintaining electrode reliability while allowing the optimized layer positioning for high aperture ratio
Data Source
AI summary
A highly reliable display device is provided. The display device includes a first conductive layer, a second conductive layer, a third conductive layer, a fourth conductive layer, an insulating layer, a functional layer, and a light-emitting layer. The second conductive layer is provided over the first conductive layer and the third conductive layer is provided over the second conductive layer. A side surface of the second conductive layer is positioned on the inner side of side surfaces of the first and third conductive layers in a cross-sectional view. The insulating layer is provided to cover at least part of the side surface of the second conductive layer. The fourth conductive layer is provided to cover the first to third conductive layers and the insulating layer and to be electrically connected to the first to third conductive layers. The functional layer is provided to include a region in contact with the fourth conductive layer and the light-emitting layer is provided over the functional layer. The visible light reflectance of at least one of the first to third conductive layers is higher than the visible light reflectance of the fourth conductive layer.