Quantum Dot LED Backlight Module for Blue Light Wavelength Control
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Solution Overview
Problem
Current LED technologies generate white light with a high concentration of blue light at 460 nm, which is harmful to human eyes and can lead to senile macular degeneration upon excessive exposure, necessitating a solution to reduce or eliminate this harmful light intensity.
Innovation Solution
An LED device and backlight module incorporating a quantum dot film or particles that generate red, green, and blue light under ultraviolet excitation, with the blue light wavelength within the 450-470 nm range, excluding 460 nm, to attenuate or eliminate the harmful blue light intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If blue light chip with yellow phosphor powder is used to generate white light, then white light can be obtained, but the blue light intensity at 460 nm wavelength is harmful to human eyes
Solution Approach 1:
The patent changes the wavelength parameter of blue light from 460 nm (harmful) to 450-470 nm range excluding 460 nm by using quantum dot materials with specific size distributions. This parameter change eliminates the harmful effect while maintaining white light output.
Solution Approach 2:
The patent uses composite quantum dot materials comprising multiple types of quantum dots with different size distributions to generate blue light at different wavelengths within the 450-470 nm range, avoiding the harmful 460 nm wavelength while maintaining overall white light generation.
2Object-affected harmful factors
If quantum dot film with multiple quantum dot materials is used, then blue light at harmful 460 nm wavelength can be eliminated, but the device structure becomes more complex
Solution Approach 1:
The patent merges multiple types of quantum dot materials into a single quantum dot film layer that can be applied directly to the light-emitting surface of the illuminant. This combining approach eliminates harmful blue light while avoiding the need for multiple separate layers or complex multi-layer structures.
Solution Approach 2:
The quantum dot film serves multiple functions simultaneously: it converts ultraviolet light to visible light, generates blue light at safe wavelengths, and eliminates harmful 460 nm blue light all in a single component, reducing overall device complexity.
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 eye damage from blue light by generating blue light with a wave crest outside the harmful 460 nm range, creating a healthier light source for electronic products.
Implementation Method 1
the quantum dot film includes quantum dot materials capable of generating red light, green light and blue light under excitation by ultraviolet light
Implementation Method 2
the quantum dot film includes quantum dot materials capable of generating red light, green light and blue light under excitation by ultraviolet light; the wavelength of the generated blue light is within a wave band of 450 ̃470 nm, and a wave crest of the generated blue light is located within the wave band excluding 460 nm
Data Source
AI summary
Embodiments of the present disclosure provide a LED device, a light guide plate and a backlight module, which are capable of generating red light, green light and blue light under excitation of ultraviolet light, and reducing damages of human eyes due to blue light by attenuating or eliminating light intensity of the blue light having a wavelength of 460 nm. The LED device comprises an ultraviolet illuminant and a quantum dot film located on a light emitting side of the ultraviolet illuminant. The quantum dot film includes a quantum dot material capable of generating the red light, the green light and the blue light under excitation of ultraviolet light. The wavelength of the generated blue light is within a wave band of 450˜470 nm, and a wave crest of the generated blue light is located within the wave band excluding 460 nm.