LED Device Dual Green Conversion Materials Wide Color Gamut
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Solution Overview
Problem
Current methods to reduce blue light emission in display devices, such as using filters or software to decrease blue light intensity, often result in color distortion and a compromised display effect, negatively impacting user experience.
Innovation Solution
A light-emitting diode device incorporating a blue light-emitting diode and two green conversion materials with different wavelength ranges and full-width-half-maximum (FWHM) values, along with a red conversion material, to generate an output light with reduced blue light intensity while maintaining wide color gamut, by converting blue light into green and red light within specific wavelength ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If filters or software are used to reduce blue light intensity, then blue light intensity is reduced, but color distortion occurs and display effect deteriorates
Solution Approach 1:
The patent segments the green light conversion into two distinct components: a first green conversion material with a first peak wavelength and a second green conversion material with a second peak wavelength. This segmentation allows for a more distributed and natural green spectrum that avoids the monochromatic peak causing color distortion, thereby reducing blue light while maintaining display quality.
Solution Approach 2:
The patent employs a composite light conversion layer containing multiple conversion materials: a red conversion material, a first green conversion material, and a second green conversion material. This composite structure enables simultaneous achievement of blue light reduction and wide color gamut by combining the spectral characteristics of different materials, avoiding the color distortion associated with single-material solutions.
2Object-affected harmful factors
If blue light intensity is reduced to protect eyes, then eye protection is improved, but overall display effect and user experience worsen
Solution Approach 1:
The patent changes the spectral parameters of the green light by introducing two green conversion materials with different peak wavelengths. The first green conversion material has a first peak wavelength in the green region, and the second green conversion material has a second peak wavelength also in the green region but different from the first. This parameter change creates a broader, more natural green spectrum that maintains perceived brightness while reducing harmful blue light content.
3Object-affected harmful factors
If single green conversion material is used to convert blue light, then blue light is converted to green, but color gamut is limited
Solution Approach 1:
The patent segments the green conversion function into two separate green conversion materials with different peak wavelengths. This segmentation broadens the effective green spectrum coverage, enabling the display to achieve a wider color gamut while simultaneously converting blue light to green light for eye protection purposes.
Solution Approach 2:
The patent uses a composite system combining red conversion material, first green conversion material, and second green conversion material. This composite material approach enables the simultaneous achievement of blue light conversion and wide color gamut, as each material contributes specific spectral characteristics that collectively cover a broader range of visible wavelengths.
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
The solution effectively reduces the proportion of harmful blue light while ensuring a wide color gamut, providing better eye protection and improved display quality compared to existing low blue light technologies.
Implementation Method 1
The first green conversion material is configured to convert a blue light emitted from the blue light-emitting diode to generate a first green light with a first wavelength range and a first wavelength full-width-half-maximum (FWHM)
Implementation Method 2
The second green conversion material is configured to convert the blue light and to generate a second green light with a second wavelength range and a second wavelength FWHM
Implementation Method 3
The red conversion material is configured to convert the blue light and to generate a red light
Data Source
AI summary
A light-emitting diode device is provided. First and second green conversion materials are respectively configured to convert a blue light emitted from a blue light-emitting diode to generate a first green light with a first wavelength range and a first wavelength FWHM, and a second green light with a second wavelength range and a second wavelength FWHM. The second wavelength FWHM is smaller than the first wavelength FWHM. A lower bound of the first wavelength range is smaller than a lower bound of the second wavelength range, and an upper bound of the second wavelength range is greater than an upper bound of the first wavelength range. An output light emitted from the light-emitting diode device has a spectral characteristic of less than 50% of TÜV Rheinland and more than 90% of wide color gamut.