Wavelength Conversion Display Stack for Shorter OLED Optical Spacing
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Solution Overview
Problem
Existing display devices face challenges in reducing the physical distance between the wavelength conversion pattern and the organic light-emitting layer, which affects the efficiency and performance of color reproduction.
Innovation Solution
The display device design includes a reduced physical distance between the wavelength conversion pattern and the organic light-emitting layer by employing a specific structure with conductive patterns and layers, such as conductive oxides and metals, to enhance light emission and color conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the physical distance between wavelength conversion pattern and organic light-emitting layer is reduced, then color reproducibility and light emission efficiency are improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent transitions from a planar structure to a three-dimensional stacked structure by introducing an inorganic capping layer that extends vertically over the wavelength conversion pattern. This dimensional change allows the organic light-emitting layer to be positioned closer to the wavelength conversion pattern in the vertical dimension while maintaining proper separation in the horizontal plane, thus improving light emission efficiency without compromising manufacturing precision.
Solution Approach 2:
The inorganic capping layer serves as an intermediary structure between the wavelength conversion pattern and the organic light-emitting layer. It provides a controlled interface that enables precise positioning and spacing, acting as a mediator that facilitates close proximity for improved optical efficiency while maintaining manufacturability through standardized layer deposition processes.
2Measurement precision
If the physical distance between wavelength conversion pattern and organic light-emitting layer is reduced, then color reproducibility is improved, but device complexity increases
Solution Approach 1:
The device is segmented into distinct functional layers with the inorganic capping layer forming a separate structural unit between the wavelength conversion pattern and the organic light-emitting layer. This segmentation allows each layer to be optimized independently for its specific function while maintaining overall color reproducibility, managing complexity through modular design.
Solution Approach 2:
The inorganic capping layer performs multiple functions simultaneously: it provides mechanical support for precise spacing, serves as an encapsulation barrier, and facilitates optical coupling between layers. This multi-functionality reduces the need for additional separate components, thereby improving color reproducibility without proportionally increasing device complexity.
3Productivity
If the physical distance between wavelength conversion pattern and organic light-emitting layer is reduced, then overall efficiency is improved, but light penetration into neighboring pixels increases
Solution Approach 1:
The inorganic capping layer is positioned locally over specific regions of the wavelength conversion pattern, creating localized optical management zones. This local quality approach allows close spacing for improved efficiency in targeted areas while the layer's geometric configuration and material properties control light propagation to prevent harmful penetration into neighboring pixel regions.
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 design improves color purity and reproducibility by optimizing the distance and structure, leading to enhanced color conversion efficiency and side visibility.
Implementation Method 1
The wavelength conversion pattern may include wavelength conversion particles that convert the wavelength of light emitted from the light-emitting element layer
Implementation Method 2
The wavelength conversion pattern may further include scattering particles that may scatter light emitted from the light-emitting element layer
Implementation Method 3
Electrons and holes from the two electrodes may recombine in the light-emitting layer to generate excitons. In response to the transition of the excitons from an excited state to a ground state, light may be emitted
Data Source
AI summary
A display device includes a first base substrate including a light-emitting area and a non-light-emitting area around the light-emitting area, a wavelength conversion pattern on the first base substrate in the light-emitting area, and a light-emitting element layer on the wavelength conversion pattern. The light-emitting element layer includes a pixel electrode including a first conductive pattern between the wavelength conversion pattern and the first base substrate, and a second conductive pattern on the wavelength conversion pattern and spaced apart from the first conductive pattern, an organic light-emitting layer on the second conductive pattern, and a common electrode on the organic light-emitting layer.