Organic Light-Emitting Display With 3D Structure for Pixel Isolation
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Solution Overview
Problem
Existing organic light-emitting display devices face challenges in achieving high luminance and clear image quality due to light leakage between pixels or subpixels, which is exacerbated by the need for brighter and clearer screens in small, high-resolution displays.
Innovation Solution
The solution involves incorporating a three-dimensional structure on the auxiliary electrode with an organic light-emitting element that expands the light-emitting area and using a resin layer to prevent light leakage, along with an anode separation structure to block current leakage, thereby enhancing luminance and image clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the organic light-emitting element area is expanded to increase luminance, then light leakage between pixels or subpixels increases
Solution Approach 1:
The patent divides the light-blocking function into multiple components: the encapsulation layer is segmented into pixel-defining regions and light-blocking regions, and additional light-blocking structures (such as black matrix or light-blocking resin layers) are introduced to create multiple barriers. This segmentation allows the light-emitting area to be expanded while maintaining effective isolation between pixels through the combined action of these segmented light-blocking elements.
Solution Approach 2:
The patent introduces intermediary light-blocking structures between the organic light-emitting element and the external environment. These include light-blocking resin layers, black matrix layers, and encapsulation layer light-blocking regions that act as mediators to absorb or block stray light before it can leak into adjacent pixels, thereby enabling larger light-emitting areas without compromising image quality.
2Area of stationary object
If a planar organic light-emitting element structure is used, then the manufacturing process is simple, but the light-emitting area is limited
Solution Approach 1:
The patent transitions from a two-dimensional planar light-emitting structure to a three-dimensional structure by forming light-blocking regions with varying thicknesses within the encapsulation layer. The encapsulation layer includes a first light-emitting region and a second light-blocking region with greater thickness, creating vertical dimensionality that enhances light blocking capability while expanding the effective light-emitting footprint area.
Solution Approach 2:
The patent implements nested structures where light-blocking regions are embedded within the encapsulation layer, and additional light-blocking structures (such as black matrix or resin layers) are positioned around or within the encapsulation layer. This nesting approach allows multiple light-blocking functions to be integrated within a compact structure, increasing the light-emitting area without proportionally increasing overall device complexity.
3Reliability
If the light-blocking structures are added to prevent light leakage, then image quality improves, but the device complexity increases
Solution Approach 1:
The patent designs the encapsulation layer to serve multiple functions simultaneously: it provides moisture and oxygen barrier protection, defines pixel boundaries, and contains integrated light-blocking regions. The encapsulation layer thus acts as a multi-functional element that combines protection, structuring, and light management, reducing the need for separate dedicated components and thereby limiting the increase in device complexity while improving image quality.
Solution Approach 2:
The patent merges the light-blocking function with the encapsulation layer structure itself, rather than treating them as separate components. The encapsulation layer is formed to include both light-transmitting regions (over the organic light-emitting element) and light-blocking regions (with greater thickness or different material composition), combining structural protection and optical control into a single integrated element.
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 significantly increases the light-emitting area by up to five times and improves luminance and lifespan while ensuring clear image quality by preventing light and current leakage between pixels or subpixels.
Implementation Method 1
an organic light-emitting layer on the anode electrode; and a cathode electrode on the organic light-emitting layer
Data Source
Figure 1
Figure 2A~2B
Figure 2C~2D
AI summary
An organic light-emitting display device can include a substrate, an auxiliary electrode in each of a plurality of subpixels, a three-dimensional structure on the auxiliary electrode, an organic light-emitting element surrounding the three-dimensional structure, an encapsulation layer surrounding the organic light emitting device, and a resin layer on the encapsulation layer. The organic light-emitting element can include an anode electrode surrounding an upper surface and a side surface of the three-dimensional structure and is connected to an auxiliary electrode through the side surface of the three-dimensional structure, an organic light-emitting layer on the anode electrode, and a cathode electrode on the organic light-emitting layer.