Light Emission Device Reflection Interfaces
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Solution Overview
Problem
Existing light emission devices with organic electroluminescence elements face challenges in enhancing light distribution characteristics, particularly in maintaining intensity and chromaticity across different viewing angles due to variations in the effects of the cavity structure between red, green, and blue light emission elements.
Innovation Solution
The light emission device incorporates a specific configuration with first and second reflection interfaces, a light extraction plane, and third and fourth reflection interfaces, which are strategically positioned to cause attenuation or reinforcement of light emission spectra, allowing for adjusted light emission states in each element region, thereby enhancing light distribution characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a cavity structure is used in light emission devices with organic electroluminescence elements, then light extraction efficiency can be improved, but light distribution characteristics deteriorate due to variations in intensity and chromaticity across different viewing angles
Solution Approach 1:
The patent applies local quality by configuring different reflection interfaces with specific optical distances tailored to different wavelength regions. The first reflection interface is positioned at an optical distance that reinforces red light, while the second reflection interface is positioned at a different optical distance that reinforces blue light. This localized optimization of reflection conditions for different spectral regions allows the device to maintain high light extraction efficiency across the visible spectrum while achieving uniform light distribution characteristics across different viewing angles.
2Illumination intensity
If the optical distance from the light emission layer to the reflection interface is increased, then light reinforcement can be achieved for specific wavelengths, but light distribution uniformity deteriorates due to angle-dependent intensity variations
Solution Approach 1:
The patent employs parameter changes by precisely controlling the optical distances from the light emission layer to different reflection interfaces. The first reflection interface is set at an optical distance satisfying a specific wavelength reinforcement condition for red light, while the second reflection interface is set at a different optical distance for blue light reinforcement. By changing and optimizing these optical distance parameters for different spectral regions, the invention achieves wavelength-selective light reinforcement while maintaining stable and uniform light distribution characteristics across various viewing angles.
3Manufacturing precision
If multiple reflection interfaces are introduced to control different wavelengths, then chromaticity control improves, but device complexity increases
Solution Approach 1:
The patent applies universality by designing a cavity structure where multiple reflection interfaces serve dual functions: each interface is positioned to reinforce specific wavelength regions (red or blue) while collectively they all contribute to achieving uniform light distribution across viewing angles. This multi-functional design allows the reflection interfaces to simultaneously perform wavelength-selective reinforcement and overall light distribution control, thereby achieving precise chromaticity control 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 configuration results in a reduced dependency on viewing angle for intensity and chromaticity, achieving high light emission quality with maintained Δuv of 0.015 or less and intensity of 60% or more at 45°, and allows for high light transmittance over a wide wavelength range, enhancing the efficiency of light extraction and reducing power consumption.
Implementation Method 1
The second reflection interface is configured to allow reflection from the second reflection interface to cause reinforcement with respect to center wavelengths of light emission spectra of the first light emission layer and the second light emission layer
Implementation Method 2
The third reflection interface is configured to allow reflection from the third reflection interface to cause attenuation with respect to the center wavelength of the light emission spectrum of the first light emission layer
Implementation Method 3
The disclosure relates to a light emission device, a display apparatus, and an illumination apparatus that utilize, for example, organic electroluminescence elements that emit light by an organic electroluminescence (EL) phenomenon
Data Source
AI summary
Provided is a light emission device including: first and second light emission element regions; first to fourth reflection interfaces; a light extraction plane; and first and second light emission layers. The first reflection interface is provided in the first and second light emission element regions. The light extraction plane is provided in confronted relation to the first reflection plane. The second reflection interface allows reflection therefrom to cause reinforcement with respect to center wavelengths of light emission spectra of the first and second light emission layers. The third and fourth reflection interfaces allow reflection therefrom to cause attenuation with respect to the center wavelength of the light emission spectrum of the first light emission layer, and to cause reinforcement with respect to the center wavelength of the light emission spectrum of the second light emission layer.