OLED Luminance Layer Gradient Reflectivity
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Solution Overview
Problem
The high reflectivity of the cathode plate in OLED displays reduces contrast and sharpness, and existing solutions like adding a ¼ wavelength plate and polarizer increase costs.
Innovation Solution
The OLED display module incorporates a luminance function layer with a gradient reflectivity structure, where the reflectivity near the cathode plate is significantly higher than further layers, utilizing multiple layers including electron and hole transport layers, and a reflectivity-change layer made of inorganic materials to manage light reflection effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a metal cathode plate is used for light emission, then the OLED can emit light from the cathode side, but the high reflectivity of the metal cathode plate decreases the contrast and sharpness of the display
Solution Approach 1:
The patent applies local quality by creating a gradient reflectivity structure within the luminance function layer. Different regions of the layer have different reflectivity characteristics, with the reflectivity gradually changing from the cathode side to the anode side. This allows the structure to simultaneously manage light emission and reduce harmful reflections without requiring additional expensive components.
Solution Approach 2:
The patent changes the reflectivity parameter of the luminance function layer by using multiple materials with different reflectivity values arranged in a gradient structure. This parameter change approach allows the system to control light reflection effectively, reducing the harmful reflective effects of the metal cathode while maintaining efficient light emission.
2Object-affected harmful factors
If a 1/4 wavelength plate and polarizer are added to reduce reflection, then the contrast and sharpness improve, but the manufacturing cost increases significantly
Solution Approach 1:
The patent merges the reflection control function into the existing luminance function layer structure. Instead of adding separate wavelength plates and polarizers as distinct components, the reflection management is integrated into the organic luminance layer itself through the gradient reflectivity structure. This merging approach reduces component count and manufacturing complexity while achieving the desired optical performance.
Solution Approach 2:
The luminance function layer with gradient reflectivity structure provides self-service by inherently managing its own reflection problems. The structure automatically controls light reflection through its designed gradient properties, eliminating the need for additional external components to correct reflective issues. This self-service capability reduces both cost and structural 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 enhances the contrast and sharpness of OLED displays by controlling light reflection, reducing the need for costly additional components and improving display quality.
Implementation Method 1
Multiple reflectivities among multiple layers of the luminance function layer are satisfied with a following relationship, which is a reflectivity of the material of the luminance function layer near to the cathode plate is greatly higher than a reflectivity of another material of the luminance function layer distant from the cathode plate
Data Source
AI summary
The present disclosure provides an OLED display and display module thereof. The OLED display module includes: a cathode plate, an anode plate and a luminance function layer sandwiched in between the cathode plate and the anode plate, and characterized in that multiple reflectivities among multiple layers of the luminance function layer are satisfied with a following relationship, which is a reflectivity of the material of the luminance function layer near to the cathode plate is greatly higher than a reflectivity of another material of the luminance function layer distant from the cathode plate. The display module solves the technical problem of decreasing the contrast and sharpness of the OLED display caused by the cathode plate with the high reflectivity.