Multi-Peak Resonator Light-Emitting Element for Stable Luminance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Light-emitting elements with a resonator structure face significant luminance fluctuations due to manufacturing errors in film thickness, leading to variations in resonator optical path length, which are not tolerable in small display devices requiring consistent luminance in the front direction.
Innovation Solution
A light-emitting element with a resonator structure featuring at least two resonance spectral peaks in the visible light range, where the relative luminosity maximum wavelength serves as a border line, and an emission output spectrum with multiple peaks based on these resonance peaks, designed to minimize luminance fluctuations by synchronously shifting peak wavelengths with changes in resonator optical path length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a resonator structure is employed to enhance luminance in the front direction, then luminance output is improved, but luminance fluctuation due to manufacturing errors increases
Solution Approach 1:
The patent changes the spectral parameters of the resonator structure by introducing multiple resonance peaks at different wavelengths instead of a single peak. This parameter change makes the system less sensitive to optical path length variations, as the combined effect of multiple peaks provides more stable overall luminance output despite manufacturing tolerances.
Solution Approach 2:
The resonator structure functions as a composite optical system with multiple resonance modes. By combining multiple resonance peaks with different wavelength characteristics, the structure creates a composite response that compensates for individual peak variations caused by manufacturing errors in film thickness.
2Device complexity
If a single resonance peak is used in the resonator structure, then the structure is simple, but luminance fluctuation cannot be tolerated
Solution Approach 1:
Instead of using a single resonance peak, the patent introduces multiple resonance peaks at different wavelengths. This parameter change transforms the resonator from a single-mode to a multi-mode system, which inherently provides tolerance to manufacturing variations without requiring extremely precise film thickness control.
3Adaptability or versatility
If the resonator optical path length varies due to film thickness deviation, then chromatic coordinates and luminance fluctuation occur, but wide viewing angle characteristics are required
Solution Approach 1:
The patent changes the resonator's spectral parameters by creating multiple resonance peaks across different wavelengths. This multi-peak configuration provides robustness against optical path length variations, enabling the display to maintain acceptable performance across different viewing angles even with manufacturing tolerances in film thickness.
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 luminance fluctuations even with deviations in film thickness, ensuring consistent luminance and improved manufacturing yield and cost reduction by allowing variations in film thickness.
Implementation Method 1
a resonator structure that transmits part of light by the first reflective member or the second reflective member, the light being resonated between the first reflective member and the second reflective member
Implementation Method 2
the resonator structure has at least two or more resonance spectral peaks at respective wavelengths in a visible light range
Implementation Method 3
an EL element utilizing a substance which self-emits light in the presence of an applied voltage due to an electroluminescence (EL) phenomenon
Data Source
AI summary
A light-emitting element and a display device having a resonator structure which has a small luminance fluctuation, even if a film thickness is deviated from a designed value, thereby resulting in a variation in resonator optical path length. There are included: a first reflective member; a second reflective member; and a light-emitting layer provided therebetween, and there is provided a resonator structure that transmits part of light by the first reflective member or the second reflective member, the light being resonated between the first reflective member and the second reflective member. The resonator structure has at least two or more resonance spectral peaks at respective wavelengths in a visible light range with a wavelength of a maximum value relative luminosity being a border line and an emission output spectrum has at least two or more peaks at respective wavelengths based on the resonance spectral peaks.