Organic EL Partition Curvature and Height Optimization
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Solution Overview
Problem
Organic EL display panels face issues with viewing angle dependency, contrast reduction, and light leakage due to the shape and height of partitions, which affect image quality and high-definition display, especially in large-sized panels.
Innovation Solution
The solution involves adjusting the height and shape of partitions in organic EL display devices, with a perpendicular distance between the top surface of the first electrode and the second partition ranging from 0.5 μm to 1.3 μm, and forming the first partition with a curved top surface and the second partition with a reverse tapered shape, using materials like organic or inorganic insulating materials, to optimize light path length and reduce leakage current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the height of partition is increased to prevent light leakage, then light leakage is reduced, but viewing angle dependency increases and contrast is reduced
Solution Approach 1:
The patent optimizes the partition height to a specific range (0.5-1.3 μm) to balance light leakage prevention with maintaining acceptable viewing angle characteristics. This parameter optimization resolves the contradiction by finding the optimal height that provides sufficient isolation without excessive height that would degrade viewing angle dependency.
Solution Approach 2:
The partition is designed with a curved top surface instead of a flat surface. This curvature helps to reduce viewing angle dependency by smoothly directing light paths, thereby mitigating the contrast reduction that would otherwise occur when partition height is increased to prevent light leakage.
2Object-generated harmful factors
If the height of partition is increased to prevent light leakage, then light leakage is reduced, but contrast is reduced
Solution Approach 1:
The patent optimizes the partition height to a specific range (0.5-1.3 μm) to balance light leakage prevention with maintaining acceptable contrast. This parameter optimization resolves the contradiction by finding the optimal height that provides sufficient isolation without excessive height that would degrade contrast.
Solution Approach 2:
The curved top surface of the partition helps to maintain contrast by smoothly directing light paths and reducing stray light, thereby mitigating the contrast reduction that would otherwise occur when partition height is increased to prevent light leakage.
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 configuration improves image quality by reducing viewing angle dependency, increasing contrast, and preventing light leakage, enabling high-definition display even in large-sized panels.
Implementation Method 1
the optical path length is optimized in accordance with the light wavelength of three colors of RGB... optimization of the optical path length is conducted by changing the thickness of a transparent conductive layer
Implementation Method 2
a microcavity structure utilizing multiple reflection... When the color filter and the microcavity structure are combined, reflection of external light can be reduced, and light emitted from the white organic EL element can be extracted efficiently
Implementation Method 3
color organic EL display panels using an oxide semiconductor for a TFT... light emitted from the white organic EL element... a tandem light-emitting element in which a plurality of light-emitting units and an intermediate unit are stacked
Data Source
AI summary
To improve image quality of a full-color organic EL display panel. A partition has a stacked structure formed using different materials. A lower partition has a curved shape, and an upper partition has a flat top surface. An angle formed between a plane surface connecting a lower end of a side surface with an upper end of the side surface of the upper partition and the top surface of the upper partition is less than or equal to 90°. The height of the partition is controlled to be greater than or equal to 0.5 μm and less than or equal to 1.3 μm. With such a structure, a large color organic EL display panel achieves high-definition display.