Self-Luminescent Display Module With Turquoise QD Color Conversion
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Solution Overview
Problem
Display modules using self-luminescence elements face limitations in light conversion efficiency and material costs for blue light emission, and potential human harm from ultraviolet light leakage when using elements emitting below 430 nm, due to restricted material selection and degradation issues.
Innovation Solution
A display module design incorporating self-luminescence elements that emit light between 430 nm and 460 nm, with turquoise quantum dots or phosphors in color conversion layers to enhance light conversion efficiency and reduce material usage, while minimizing ultraviolet light exposure, using InGaN semiconductor elements with a specific In:Ga ratio and multiple color conversion layers to produce accurate blue color reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If self-luminescence elements emitting blue light of wavelength 460 nm are applied, then blue light emission is achieved, but light conversion efficiency is limited and large amount of materials should be used
Solution Approach 1:
The patent changes the emission wavelength parameter of the self-luminescence element from 460 nm to a shorter wavelength (430 nm or lower, including ultraviolet range). This parameter change enables the quantum dots to absorb the emitted light more effectively, improving light conversion efficiency and reducing the amount of quantum dot materials needed.
Solution Approach 2:
Instead of using blue light emitting elements (460 nm) and converting to other colors, the patent inverts the approach by using shorter wavelength elements (430 nm or lower including UV) and converting to blue, red, and green colors. This inversion allows for better absorption characteristics and reduced material requirements.
2Ease of manufacture
If self-luminescence elements emitting ultraviolet light of wavelength 430 nm or lower are applied, then light conversion is possible, but organic matter in color conversion layers deteriorates and material selection is limited
Solution Approach 1:
The patent accepts that organic materials in the color conversion layer have limited lifespan under UV exposure but compensates by using minimal amounts of these materials and designing the system to operate within acceptable performance degradation ranges, effectively treating the organic layers as consumable components.
Solution Approach 2:
The patent introduces an intermediary approach by carefully selecting and optimizing the organic materials in the color conversion layer to resist UV degradation, and by controlling the thickness and composition to balance light conversion efficiency with material stability under ultraviolet exposure.
3Ease of manufacture
If self-luminescence elements emitting ultraviolet light are applied, then light conversion is achieved, but ultraviolet light leakage may cause harm to human bodies
Solution Approach 1:
The patent converts the potentially harmful ultraviolet light into beneficial visible light through the color conversion layer. The UV light emitted by the self-luminescence elements is absorbed by the quantum dots in the color conversion layer and re-emitted as visible blue, red, and green light, eliminating the harmful UV leakage while maintaining efficient light conversion.
Solution Approach 2:
The color conversion layer acts as an intermediary between the UV light source and the viewer. It absorbs the harmful UV radiation and converts it to safe visible light, serving as a protective barrier that enables UV-based light conversion while preventing UV leakage to human bodies.
4Manufacturing precision
If In content increases in InGaN semiconductor elements to achieve 460 nm blue light, then wavelength accuracy is improved, but quantum efficiency is restricted and manufacturing cost increases
Solution Approach 1:
The patent inverts the conventional approach of using InGaN with high In content for blue light. Instead, it uses self-luminescence elements with shorter wavelengths (430 nm or lower) that have better quantum efficiency and lower manufacturing costs, then converts this light to the desired blue wavelength through quantum dot-based color conversion.
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
Improves light conversion efficiency, reduces material costs, and ensures safe operation by emitting light within a safer wavelength range, effectively addressing the limitations of existing technologies in blue light emission and color reproduction.
Implementation Method 1
the self-luminescence layer is configured to emit light of a wavelength that is less than or equal to 460 nm
Implementation Method 2
the first color conversion layer includes a first color conversion material including a turquoise quantum dot or a turquoise phosphor
Data Source
AI summary
A display module includes a substrate, and a plurality of pixels provided on the substrate, where each of the plurality of pixels includes a self-luminescence layer, a first color conversion layer, a second color conversion layer, and a third color conversion layer provided on the self-luminescence layer, and a first color filter, a second color filter, and a third color filter respectively provided on the first color conversion layer, the second color conversion layer, and the third color conversion layer, where the self-luminescence layer is configured to emit light of a wavelength that is less than or equal to 460 nm and the first color conversion layer includes a first color conversion material including a turquoise quantum dot or a turquoise phosphor.