OLED Display Panel Light Extraction Layer Positioning
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Solution Overview
Problem
Current OLED display panels face limitations in light extraction efficiency and bright room contrast, particularly when using internal extraction structures, which reduce their effectiveness in outdoor environments with ambient light.
Innovation Solution
The OLED display panel incorporates a polarizing layer and a light extraction layer, where the light extraction layer is positioned closer to the light exit surface than the polarizing layer, utilizing scattering particles like silicon oxide to enhance light extraction efficiency while maintaining high bright room contrast by filtering external ambient light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a light extraction layer with scattering particles is introduced to improve light extraction efficiency, then the light extraction efficiency increases, but the device structure becomes more complex
Solution Approach 1:
The light extraction layer is nested between the base substrate and the polarizing layer, with the polarizing layer containing the light extraction layer within the display panel structure. This nested arrangement allows the light extraction function to be integrated without significantly increasing overall device complexity.
Solution Approach 2:
The light extraction layer is formed as a composite material containing scattering particles (such as silicon oxide particles) dispersed in a resin matrix. This composite structure enables light extraction enhancement through scattering while maintaining a relatively simple single-layer configuration.
2Loss of energy
If the light extraction layer is positioned closer to the light exit surface to enhance light extraction, then the light extraction efficiency improves, but the bright room contrast may deteriorate due to increased ambient light interference
Solution Approach 1:
The display panel is segmented into distinct functional layers with the light extraction layer and polarizing layer separated and positioned at different locations. The light extraction layer is placed closer to the light exit surface for efficient light extraction, while the polarizing layer is positioned to filter ambient light, allowing each layer to optimize its function independently.
Solution Approach 2:
The polarizing layer acts as an intermediary between the light extraction layer and the external environment. It mediates the interaction by selectively filtering polarized ambient light while allowing the display light to pass through, thus protecting the light extraction function from ambient light interference.
3Illumination intensity
If the refractive index of the light extraction layer is matched to the polarizing layer to reduce interface reflection, then light transmission improves, but the scattering effect may be reduced
Solution Approach 1:
The light extraction layer exhibits local quality variation through the distribution of scattering particles within the resin matrix. Different regions of the layer have different scattering properties, allowing simultaneous optimization of light transmission (through the resin matrix) and scattering effect (through particle distribution).
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 significantly improves light extraction efficiency and maintains high bright room contrast, enabling effective display in outdoor environments with strong light, while ensuring high light emitting efficiency.
Implementation Method 1
a material of the light extraction layer comprises scattering particles
Implementation Method 2
utilizing scattering particles like silicon oxide to enhance light extraction efficiency while maintaining high bright room contrast by filtering external ambient light
Data Source
AI summary
The present disclosure provides an OLED display panel and an OLED display device, and belongs to the field of display technology. The OLED display panel of the present disclosure includes a base substrate and a display cover disposed opposite to each other; a polarizing layer disposed between the base substrate and the display cover; a light extraction layer disposed between the base substrate and the display cover; the OLED display panel is provided with a light exit surface, and the light extraction layer is closer to the light exit surface than the polarizing layer.