Organic Light Emitting Display Device Sub-Electrode Resonance
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Solution Overview
Problem
Conventional organic light emitting display devices struggle to emit white light efficiently due to resonance effects that only strengthen light of specific wavelengths, failing to properly mix red, green, and blue light emissions.
Innovation Solution
The device incorporates a first electrode with sub-electrodes of varying reflectivities, forming multiple resonance distances between the electrodes to resonate and emit lights of desired wavelengths, ensuring effective mixing and enhancement of red, green, and blue light emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single reflection electrode is used, then the device structure is simple, but only light of specific wavelength can be resonated and emitted efficiently
Solution Approach 1:
The first electrode is divided into multiple sub-electrodes (first sub-electrode, second sub-electrode, etc.) with different reflectivities. Each sub-electrode resonates with light of different wavelengths, enabling the device to emit multiple wavelengths simultaneously. This segmentation transforms a single-function electrode into a multi-functional component that can handle different wavelength ranges.
Solution Approach 2:
Different portions of the first electrode (each sub-electrode) are given different local properties - specifically, different reflectivities optimized for different wavelength ranges. The first sub-electrode has high reflectivity for blue light, while the second sub-electrode has high reflectivity for red light, allowing each region to specialize in resonating specific wavelengths.
2Productivity
If multiple sub-electrodes with different reflectivities are used, then multiple wavelengths can be resonated and white light emission efficiency is improved, but the device structure becomes more complex
Solution Approach 1:
Multiple sub-electrodes with different wavelength-specific functions are merged into a single integrated first electrode structure. This combining approach allows the device to achieve multi-wavelength resonance capability without creating separate independent electrode systems, thus improving white light emission efficiency while controlling structural complexity.
Solution Approach 2:
The first electrode is designed as a multi-functional component that can resonate with multiple wavelengths of light simultaneously through its sub-electrodes. This universal design allows a single electrode structure to perform the functions of multiple separate electrodes, enhancing productivity by enabling efficient white light emission across the visible spectrum.
3Illumination intensity
If a reflection electrode with high reflectivity metal is used, then light resonance is enhanced, but the emission of multiple wavelengths with desired intensities becomes difficult to control
Solution Approach 1:
Different sub-electrodes are assigned different local reflectivity properties tailored to specific wavelength ranges. The first sub-electrode has high reflectivity for blue wavelengths, while the second sub-electrode has high reflectivity for red wavelengths. This local differentiation allows strong resonance enhancement for each wavelength without compromising the ability to control and balance the intensity of multiple wavelengths in the emitted white light.
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 enhances the efficiency of white light emission by strengthening and mixing red, green, and blue light, achieving improved luminosity and color accuracy.
Implementation Method 1
multiple resonance distances are formed between the first electrode and the second electrode, and the lights having desired wavelengths can be resonated and emitted
Data Source
AI summary
Provided is an organic light emitting display device. The organic light emitting display device comprises a substrate; a first electrode formed on the substrate and including a first sub-electrode and a second sub-electrode which have different reflectivities with respect to light wavelengths and are mutually stacked; an organic layer formed on the first electrode and including an organic light emitting layer; and a second electrode formed on the organic layer.