Island-Shaped EL Layers for High-Resolution Displays
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Solution Overview
Problem
Current display devices face challenges in achieving high-resolution, high-definition, and highly reliable performance, particularly in reducing leakage current and crosstalk between subpixels, which affects display quality and aperture ratio.
Innovation Solution
The display device incorporates island-shaped EL layers formed without a fine metal mask, using a sidewall insulating layer to prevent pixel electrode contact with the common electrode and employing color conversion and coloring layers to enhance light extraction and purity, while reducing the distance between subpixels to achieve high aperture ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the distance between subpixels is reduced to achieve high resolution, then resolution is improved, but leakage current and crosstalk between subpixels increase
Solution Approach 1:
The patent divides the light-emitting structure into separate islands for each subpixel, with insulating layers between them. This segmentation prevents electrical leakage and crosstalk between adjacent subpixels while maintaining small pitch distances, thereby achieving high resolution without compromising reliability.
Solution Approach 2:
The patent introduces insulating layers (sidewall insulating layers and bank insulating layers) as intermediary structures between adjacent subpixels. These insulating layers act as barriers that prevent leakage current and crosstalk, enabling the subpixels to be placed closer together for high resolution display.
2Area of stationary object
If the distance between subpixels is reduced to achieve high aperture ratio, then aperture ratio is improved, but manufacturing complexity increases due to fine pitch requirements
Solution Approach 1:
The light-emitting layer is segmented into discrete islands corresponding to each subpixel, separated by insulating banks. This segmentation allows precise control of light-emitting areas and enables high aperture ratios even at fine pitches by eliminating unnecessary material between functional elements.
Solution Approach 2:
The patent transitions from planar continuous layers to three-dimensional island structures with vertical insulating banks. This dimensional change allows better control of light extraction paths and enables higher aperture ratios by utilizing vertical space for insulating structures rather than horizontal spacing.
3Manufacturing precision
If color conversion layers are added to enhance light extraction and purity, then display quality is improved, but device complexity increases
Solution Approach 1:
The patent combines color conversion functionality with the light-emitting island structure itself. The color conversion layers are integrated directly onto the light-emitting islands, merging the light generation and color conversion functions into a unified structure, thereby improving display quality without proportionally increasing device complexity.
Solution Approach 2:
The patent applies color conversion layers selectively to specific regions (subpixels) where they are needed, rather than uniformly across the entire display. This local application of color conversion enhances display quality in critical areas while minimizing the overall added complexity.
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
This approach results in a display device with high resolution, high contrast, and improved reliability by inhibiting leakage current and crosstalk, enabling high aperture ratios and efficient light extraction, thereby enhancing display quality.
Implementation Method 1
Light-emitting devices (also referred to as EL devices or EL elements) utilizing electroluminescence (hereinafter referred to as EL)
Implementation Method 2
The first color conversion layer overlaps with the first light-emitting device
Data Source
AI summary
A high-resolution display device is provided. A first light-emitting device and a second light-emitting device are provided over an insulating surface. A first sidewall insulating layer is in contact with a side surface of a first pixel electrode included in the first light-emitting device, and a second sidewall insulating layer is in contact with a side surface of a second pixel electrode included in the second light-emitting device. The first light-emitting device overlaps with a first coloring layer with a first color conversion layer therebetween. The first light-emitting device and the second light-emitting device share a common electrode. A first layer included in the first light-emitting device, a second layer included in the second light-emitting device, and a material layer positioned over a top surface of an insulating layer and between the first sidewall insulating layer and the second sidewall insulating layer each contain the same light-emitting material and are separated from each other.