Electroluminescent Device Resonator Wavelength Offset
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Solution Overview
Problem
Conventional electroluminescent devices experience significant color shifts in luminescent colors due to fluctuations in the intensity ratio of red, green, and blue light rays when the viewing direction changes, caused by variations in the resonant wavelengths of the resonator structures relative to the emission wavelengths.
Innovation Solution
The electroluminescent device is designed with optical output parts for red, green, and blue colors, where the resonant peak wavelengths of the transmission spectra are adjusted to be either on the longer or shorter wavelength side of the emission peak wavelengths, maintaining a consistent ratio of output intensities across different viewing angles by optimizing the optical thickness and material of the resonator structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the resonant wavelength of the resonator structure is adjusted to match the emission wavelength of the light-emitting layer, then the intensity of light output at normal viewing angle is improved, but the color stability across different viewing angles deteriorates
Solution Approach 1:
The patent applies parameter changes by deliberately offsetting the resonant wavelength from the emission wavelength. Specifically, it sets the resonant wavelength to be either longer or shorter than the emission wavelength, creating a controlled wavelength difference that compensates for viewing angle effects. This parameter adjustment resolves the contradiction by maintaining color stability while preserving adequate light output intensity.
Solution Approach 2:
The patent employs preliminary anti-action by pre-adjusting the resonant wavelength to counteract the expected color shift that occurs at oblique viewing angles. The resonator structure is designed with a wavelength offset that anticipates and compensates for the viewing angle dependency, thereby preventing color instability before it occurs.
2Stability of the object's composition
If the resonant wavelength is set on the longer wavelength side of the emission peak wavelength, then the color shift is suppressed at the expense of reduced light output intensity
Solution Approach 1:
The patent utilizes parameter changes by selecting specific wavelength offset values that balance color consistency and light intensity. By controlling the magnitude and direction (longer or shorter wavelength side) of the resonant wavelength offset, the patent optimizes both color stability and light output intensity simultaneously.
3Stability of the object's composition
If the resonant wavelength is set on the shorter wavelength side of the emission peak wavelength, then the color shift is suppressed but the light output intensity is reduced
Solution Approach 1:
The patent applies parameter changes by allowing flexibility in setting the resonant wavelength offset direction (shorter or longer wavelength side) based on specific application requirements. This parameter adjustment enables optimization of the balance between color consistency and light output intensity for different viewing angle scenarios.
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 effectively suppresses color shifts, ensuring consistent color output across various viewing angles and maintaining the intensity ratio of red, green, and blue light rays, suitable for wide viewing angles without significant color variation.
Implementation Method 1
a resonator structure that resonates light emitted from the light-emitting layer
Implementation Method 2
a light-emitting layer that emits a light ray
Data Source
AI summary
An electroluminescent device includes a first optical output part having a light-emitting layer emitting a light ray of a first color, a second optical output part having a light-emitting layer emitting a light ray of a second color, and a third optical output part having a light-emitting layer emitting a light ray of a third color, the colors being different from one another. Each of the optical output parts also has a resonator structure that resonates the light ray emitted from the light-emitting layer. In each optical output part, a resonant peak wavelength indicating a peak value of a transmission spectrum of light transmitted through the resonator structure in a direction perpendicular to a main surface of the light-emitting layer is on a longer or shorter wavelength side of an emission peak wavelength indicating a peak value of an emission spectrum of the light ray emitted by the light-emitting layer.