Optical Film Microstructures for OLED Light Extraction
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Solution Overview
Problem
Organic light emitting display (OLED) devices face issues with external light reflection, which affects their light extraction efficiency and overall performance.
Innovation Solution
An optical film with microstructures and a light absorption unit is integrated into the OLED apparatus, concentrating emitted light outward and absorbing external light to prevent reflection, utilizing a transparent resin material with varying refractive index and a convex reflection unit to enhance light transmission and absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional OLED structure is used, then the device is simple in structure, but external light is reflected which reduces light extraction efficiency
Solution Approach 1:
The optical film is segmented into multiple functional units: microstructures for light concentration and extraction, light absorption units for preventing external light reflection, and reflection units for directing light. This segmentation allows each component to perform its specific function optimally while working together to resolve the contradiction between structural simplicity and light extraction efficiency.
Solution Approach 2:
The optical film uses a composite structure combining transparent resin material with microstructures, light absorption units, and reflection units. This composite approach integrates multiple functions (light concentration, reflection prevention, and light extraction enhancement) into a single component, improving light extraction efficiency without significantly complicating the manufacturing process.
2Loss of energy
If light extraction efficiency is improved by adding optical structures, then light transmission is enhanced, but device complexity increases
Solution Approach 1:
Multiple optical functions (light concentration, reflection prevention, and light extraction enhancement) are merged into a single optical film component. The microstructures, light absorption units, and reflection units are integrated within one film layer, reducing the need for multiple separate components and minimizing the increase in device complexity while achieving improved light extraction efficiency.
Solution Approach 2:
The optical film is designed as a multi-functional component that simultaneously performs light concentration through microstructures, external light absorption to prevent reflection, and light extraction enhancement. This universality allows a single component to address multiple optical issues, reducing overall device complexity compared to using separate components for each function.
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
The solution increases light extraction efficiency by concentrating emitted light and absorbing external light, thereby improving the performance and viewing experience of OLED devices.
Implementation Method 1
A refractive index of the resin material may continuously change in a direction from the first surface toward the second surface
Implementation Method 2
the reflection unit connecting the first transmission unit and the second transmission unit and forming a side wall of each of the plurality of microstructures
Implementation Method 3
the light absorption unit disposed between the plurality of microstructures and absorbing external light
Data Source
AI summary
An optical film capable of preventing reflection of external light, and an organic light emitting display (OLED) apparatus including the same, are disclosed. The optical film is disposed on a substrate of an organic light emitting display, and comprises a first substrate, a first electrode, a light emitting unit comprising a plurality of organic light emitting elements, and a second electrode sequentially formed on the first substrate. The second substrate concentrates light emitted from the light emitting unit so as to emit outward, and absorbs external light so as to prevent the external light from being reflected.