Quantum Dot Light-Emitting Layers for Adjustable Spectrum
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Solution Overview
Problem
Conventional quantum dot-based display devices have not fully utilized the features of quantum dots, lacking the ability to adjust the spectrum and chromaticity of light emitted from pixels, and their manufacturing processes are complex and costly.
Innovation Solution
An image display device with pixels comprising multiple subpixels, each containing light-emitting layers with different peak emission wavelengths made of quantum dots, allowing for adjustable light spectrum and chromaticity by controlling the emission intensities of these layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple light-emitting layers with different emission wavelengths are stacked with electrodes between them, then the ability to adjust light spectrum and chromaticity is improved, but the device structure becomes more complex
Solution Approach 1:
The light-emitting element is divided into multiple independent light-emitting layers, each capable of emitting light at different wavelengths. These layers are stacked with electrodes between them, allowing independent control of each layer's emission. This segmentation enables flexible adjustment of the overall light spectrum and chromaticity by controlling which layers are activated and at what intensity levels.
2Use of energy by moving object
If quantum dot template film is used to form minute column assembly for light-emitting layer, then the light emission efficiency is improved, but the manufacturing process becomes more complex and costly
Solution Approach 1:
The invention extracts and eliminates the quantum dot template film step from the manufacturing process. Instead of using complex template films to form minute column assemblies, the patent directly forms the light-emitting layers containing quantum dots through simplified deposition processes. This extraction of the template film step significantly reduces manufacturing complexity and cost while maintaining the light emission efficiency benefits of structured quantum dot arrangements.
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
Enables the production of white light or light with high color purity and sufficient luminance, simplifying the manufacturing process and reducing costs by using common light-emitting layers across subpixels.
Implementation Method 1
quantum dots have emission wavelengths that vary according to the material and the dots' size. Expectations are placed on quantum dots because of their advantages of being higher in light emission efficiency than organic electroluminescence materials
Implementation Method 2
emit light if they are irradiated with rays of energy (ultraviolet light, blue light) or electric fields are applied to them
Data Source
AI summary
It is an object of the present invention to provide an image display device in which it is possible to adjust the spectrum of light emitted by pixels and adjust the chromaticity of the light emitted by the pixels. Provided is an image display device having a pixel region in which each pixel comprises a plurality of subpixels and the pixels are arranged in a matrix, wherein each of the subpixels includes a plurality of light-emitting layers overlapping each other with an electrode sandwiched therebetween, and the plurality of light-emitting layers each contain a quantum dot material and have different peak emission wavelengths from each other.