OLED Microcavity Adjusting Layer Pores Color Saturation
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Solution Overview
Problem
Organic light emitting diodes (OLEDs) suffer from low color saturation due to the microcavity effect, which enhances specific wavelengths of light but limits color gamut and overall color representation.
Innovation Solution
The OLED device incorporates sub-pixels with microcavity adjusting layers containing pores of varying porosity and average aperture, allowing for differential microcavity effects across sub-pixels, which are manufactured using a process involving polymer materials and controlled heat processes to adjust the porosity and aperture of pores in the microcavity adjusting layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a microcavity structure is used to enhance light emission, then luminous efficiency is improved, but color saturation deteriorates due to wavelength selection
Solution Approach 1:
The patent applies local quality by introducing microcavity adjusting layers with different porosity and aperture characteristics for different sub-pixels (red, green, blue). Each sub-pixel receives a tailored microcavity structure that locally adjusts the microcavity effect to compensate for wavelength-dependent color saturation issues while maintaining overall luminous efficiency
Solution Approach 2:
The patent changes physical parameters of the microcavity structure by controlling porosity (ranging from 30-70%) and aperture size (ranging from 50-200 nm) of the adjusting layers. These parameter variations allow differential adjustment of the microcavity effect for different wavelengths, resolving the contradiction between luminous efficiency and color saturation
2Ease of manufacture
If the microcavity effect is adjusted for different sub-pixels, then color gamut is improved, but device complexity increases
Solution Approach 1:
The patent employs porous polymer materials as microcavity adjusting layers to achieve differential microcavity effects. The porous structure provides a simple yet effective means to control light interaction without requiring complex multilayer dielectric stacks or metallic mirrors, thus improving color gamut while limiting device complexity
Solution Approach 2:
The patent uses composite material structures combining organic light-emitting layers with porous polymer adjusting layers. This composite approach enables independent optimization of light emission and microcavity adjustment functions, achieving enhanced color gamut without proportionally increasing device complexity
3Ease of manufacture
If porosity and aperture of microcavity adjusting layers are varied across sub-pixels, then color saturation is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The patent replaces complex mechanical or lithographic methods for creating precise microcavity structures with a chemical self-assembly approach using porous polymers. The porous structure forms through spontaneous phase separation during film formation, naturally achieving controlled porosity and aperture distributions without requiring high-precision manufacturing processes
Solution Approach 2:
The porous polymer adjusting layers exhibit self-service characteristics by automatically forming the desired porous structure during the film formation process. The phase separation mechanism self-regulates to produce appropriate porosity and aperture characteristics, reducing the need for external precision control mechanisms
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 approach enhances color saturation by adjusting the microcavity effect for each sub-pixel, improving the color gamut and light emission characteristics, making the technology suitable for mass production with low costs.
Implementation Method 1
microcavity effect means that, where a light emitting region of the organic light emitting diode is located in a resonant cavity composed of a total reflection film and a semi-reflective film and the wavelength of light emitted from the light emitting region is of the same order of magnitude as the cavity length of the resonant cavity, the light of the wavelength is selected and strengthened
Implementation Method 2
a refractive index of the microcavity adjusting layer ranges from 1.1 to 1.7
Data Source
AI summary
An organic light emitting diode device and a manufacture method thereof, a display panel are provided. The organic light emitting diode device includes a plurality of pixels, each of the pixels includes at least two sub-pixels that are capable of generating light of different colors, and each of the sub-pixels includes a first electrode, a second electrode, and a light emitting layer between the first electrode and the second electrode; and each of the sub-pixels further includes a microcavity adjusting layer including pores, the microcavity adjusting layer is on a side of the first electrode that is far away from the light emitting layer, and a porosity and an average aperture of the pores in the microcavity adjusting layer of each of the sub-pixels that are capable of generating light of different colors are different.