OLED Electrode Stack With Wavelength Conversion for Shorter Optical Paths
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Solution Overview
Problem
Current display devices face challenges in reducing the physical distance between wavelength conversion patterns and organic light-emitting layers, which affects the efficiency and color reproducibility of OLED displays.
Innovation Solution
A display device design that includes a wavelength conversion pattern on a base substrate with a reduced physical distance to the organic light-emitting layer, featuring a conductive pattern structure with conductive oxide and metal layers, and an inorganic capping layer 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 introduces a vertical stacking architecture where the wavelength conversion pattern is positioned directly above the organic light-emitting layer in the thickness direction, reducing the horizontal distance between components. This dimensional reorganization allows for shorter optical paths and improved color reproducibility while maintaining manufacturability through standardized layer deposition processes
Solution Approach 2:
The patent employs a conductive pattern structure with conductive oxide and metal layers as intermediary elements between the base substrate and the organic light-emitting layer. These intermediary layers serve multiple functions: electrical conduction, mechanical support, and precise positioning, thereby enabling reduced distances without compromising manufacturing precision
2Illumination intensity
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 conductive pattern structure with conductive oxide and metal layers is designed to perform multiple functions simultaneously: electrical conduction for device operation, mechanical support for structural integrity, and precise positioning for maintaining optimal distances. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in device complexity while achieving improved color reproducibility
Solution Approach 2:
The patent utilizes composite conductive structures combining conductive oxide and metal layers. This composite approach enables the material system to achieve superior electrical and mechanical properties that would be difficult to obtain with single materials, allowing for reduced component distances without proportionally increasing device 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 design improves the color reproducibility and overall efficiency of OLED displays by minimizing the distance between the wavelength conversion pattern and the organic light-emitting layer, leading to better light management and reduced manufacturing complexity.
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.