OLED Optical Functional Layer for Light Extraction
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Solution Overview
Problem
Conventional organic light-emitting devices suffer from low light extraction efficiency due to the use of polarizing films with poor transmittance, which reduces brightness and increases driving voltage, leading to shorter operating lifetimes.
Innovation Solution
An organic light-emitting device with an optical functional layer that has a transmittance of visible light greater than 50% and ultraviolet light less than 20%, replacing the polarizing film to enhance light extraction efficiency and prevent material degradation, while being made entirely of organic material for patterning and selective application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polarizing film is used to reduce reflected light intensity, then the contrast of image display is enhanced, but the transmittance of visible light decreases to 40-45%, reducing brightness and light extraction efficiency
Solution Approach 1:
The patent removes the polarizing film from the conventional OLED structure entirely. Instead of using a polarizing film to reduce reflected light, the invention employs an organic light-emitting pixel structure with specific electrode configurations and organic layers that inherently control light emission and reduce reflections without the need for a polarizing film, thereby maintaining high brightness while achieving good contrast.
Solution Approach 2:
The patent changes the optical parameters of the device by using organic materials with specific optical properties in the pixel structure. The organic light-emitting layer and electrode configurations are designed to emit and control light with high efficiency, achieving both high brightness and good contrast through material parameter optimization rather than using a polarizing film that limits transmittance.
2Object-affected harmful factors
If a polarizing film with 40-45% transmittance is used to shield ambient light, then reflected light intensity is reduced, but the light extraction efficiency and electroluminescent efficiency are simultaneously reduced
Solution Approach 1:
The patent extracts and removes the polarizing film component from the system. The invention achieves reflection control through the organic light-emitting pixel structure itself, using the organic layers and electrode configurations to manage light emission and reflection characteristics without introducing a separate polarizing film that would cause energy loss.
Solution Approach 2:
The organic light-emitting pixel structure serves multiple functions simultaneously: it generates light, controls emission characteristics, and manages reflection properties. The organic materials and structural design inherently provide the functions previously requiring a separate polarizing film, eliminating the need for additional components that would reduce light extraction efficiency.
3Illumination intensity
If the driving voltage is increased to maintain brightness with a polarizing film, then the brightness is maintained, but the operating lifetime is reduced
Solution Approach 1:
The patent optimizes the electrical and optical parameters of the organic light-emitting device. By using organic materials with high electroluminescent efficiency and designing optimized electrode configurations, the device achieves high brightness at lower driving voltages. This parameter optimization reduces electrical stress on the organic materials, thereby extending operating lifetime while maintaining brightness.
Solution Approach 2:
The patent employs composite organic material structures in the pixel configuration, combining different organic layers with complementary properties. This composite structure enhances overall device efficiency, allowing high brightness output with reduced driving voltage, which in turn extends the operating lifetime by minimizing degradation from electrical stress.
4Loss of energy
If an optical functional layer is introduced to improve light extraction efficiency, then the visible light transmittance increases to more than 50%, but the device structure becomes more complex
Solution Approach 1:
The patent merges the light emission function and the light extraction enhancement function into a single integrated organic light-emitting pixel structure. The organic layers and electrode configurations simultaneously perform electroluminescence and optical management, eliminating the need for separate optical functional layers that would increase structural complexity while maintaining high light extraction efficiency.
Solution Approach 2:
The organic light-emitting pixel structure is designed to perform multiple functions: light generation, light emission control, and optical enhancement. The same organic materials and structural elements that enable electroluminescence also provide high light extraction efficiency, achieving multi-functionality without adding separate components or 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
The optical functional layer significantly improves light extraction efficiency, maintains high visible light transmittance, and shields ultraviolet light, thereby enhancing the brightness and operating lifetime of the organic light-emitting device while preventing material degradation.
Implementation Method 1
the optical functional layer has a transmittance of visible light of more than 50%
Implementation Method 2
a transmittance of ultraviolet light of less than 20%
Data Source
AI summary
An organic light-emitting device and an image display system employing the same are provided. The organic light-emitting device includes: a first substrate; an organic light-emitting pixel structure disposed on a top surface of the first substrate; a second substrate having a bottom surface opposite to the top surface of the first substrate; and an optical functional layer disposed over the organic light-emitting pixel structure.