OLED Tandem Substrate with Quantum Dot Color Control
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Solution Overview
Problem
Current OLED technologies face challenges in achieving low driving voltage, high efficiency, high brightness, and long lifespan while maintaining excellent color characteristics.
Innovation Solution
The proposed solution involves a display apparatus with an OLED substrate that stacks blue and green light-emitting units, utilizing a tandem structure with charge generation layers and incorporating quantum-dot color converters and filters to adjust and enhance the color output, along with specific dopants in the emission layers for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a blue OLED substrate or white OLED substrate is used as a light source with quantum-dot color-converters, then color characteristics are improved, but driving voltage and efficiency remain suboptimal
Solution Approach 1:
The device is segmented into multiple light-emitting units (first blue light-emitting unit, green light-emitting unit, second blue light-emitting unit) stacked in sequence, each contributing to different color components. This segmentation allows independent optimization of each unit's emission characteristics and energy efficiency, while collectively achieving superior color performance through the combined output.
2Measurement precision
If multiple light-emitting units are stacked to improve color characteristics, then color output is enhanced, but device complexity increases
Solution Approach 1:
Multiple light-emitting units emitting different colors (blue and green) are merged into a single stacked structure that functions as an integrated light source. This combining approach achieves enhanced color characteristics while consolidating multiple functions into one compact device, reducing overall system complexity compared to using separate light sources.
Solution Approach 2:
The stacked light-emitting units serve multiple functions simultaneously: the blue units provide blue light emission and serve as pump sources for quantum-dot conversion, while the green unit provides green light emission. This multi-functionality reduces the need for separate components, simplifying the overall device architecture.
3Measurement precision
If quantum-dot color-converters are added to improve color characteristics, then color accuracy is enhanced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
Quantum-dot color-converters are introduced as intermediary layers between the blue light-emitting units and the final optical output. These quantum dots act as mediators that convert blue light into green and red wavelengths with high precision, achieving superior color accuracy while using a relatively simple deposition process compared to traditional color filter methods.
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 high efficiency, excellent color characteristics, and extended lifespan, achieving superior performance in OLED displays by optimizing the emission layers and color control mechanisms.
Implementation Method 1
a first color control element including a plurality of first quantum dots for green conversion; a second color control element including a plurality of second quantum dots for red conversion
Implementation Method 2
Holes injected from the anode may be transferred to the emission layer by passing through the hole transport area, and electrons injected from the cathode may be transferred to the emission layer by passing through the electron transport area. As carriers such as the holes and the electrons are recombined in the emission layer, excitons may be generated. As the excitons are shifted from an excited state to a ground state, light may be generated.
Implementation Method 3
The green light-emitting unit may include a green emission layer including an organic material, the green emission layer may include a phosphorescent dopant
Data Source
AI summary
A display apparatus including an OLED (organic light-emitting device) substrate having a structure in which at least one blue light-emitting unit and at least one green light-emitting unit are stacked, wherein the OLED substrate generates a mixed light of a blue light and a green light; and a color controller provided on the OLED substrate to adjust color of a light generated from the OLED substrate. The color controller includes a first color control element having a plurality of first quantum dots for green conversion; a second color control element having plurality of second quantum dots for red conversion; a third color control element for presenting a blue color; a first color filter provided on the first color control element; and a second color filter provided on the second color control element.