Wavelength Conversion Layer for Blue Light Color Correction
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Solution Overview
Problem
Conventional solid state light sources, such as blue laser diodes or LEDs, emit blue-violet light rather than pure blue light, affecting visual effects and color performance due to their wavelength range of 440 nm to 450 nm, which does not meet color requirements in digital television standards like Rec709.
Innovation Solution
A lighting device with a base board and a wavelength conversion material layer that absorbs and converts blue excitation light to produce a mixed light with color coordinates closer to a pre-defined blue light, using materials like phosphor or quantum dots to adjust the brightness ratio of blue excitation light to converted light, ensuring the emitted light meets color standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional blue solid state light sources (wavelength 440-450 nm) are used, then high brightness is achieved, but the color coordinate deviates from the pre-defined blue light standard (Rec709)
Solution Approach 1:
A wavelength conversion material layer (phosphor or quantum dots) is introduced as an intermediary between the blue light source and the output. This layer converts part of the blue light (440-450 nm) to other wavelengths, mixing it with remaining blue light to achieve the target color coordinate (0.152, 0.061) while maintaining high brightness
Solution Approach 2:
The patent changes the spectral parameters by using wavelength conversion materials with specific emission characteristics. By selecting phosphors or quantum dots with appropriate emission wavelengths and controlling their conversion efficiency, the output light's color coordinate is adjusted to match the Rec709 blue light standard while preserving the high intensity of the original blue source
2Manufacturing precision
If a wavelength conversion material layer is added to correct blue light color, then color coordinate accuracy is improved, but device complexity increases
Solution Approach 1:
The wavelength conversion material layer serves multiple functions simultaneously: it corrects the color coordinate to match Rec709 standards, maintains high brightness, and can be integrated into existing blue LED or laser diode structures. This multi-functionality reduces the need for additional separate components for color correction
Solution Approach 2:
The patent uses composite material structures combining the blue light source with wavelength conversion materials (phosphors or quantum dots). This composite approach enables color correction within a single integrated component rather than requiring separate correction devices, thereby managing structural 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 allows for the generation of blue light that is closer or substantially equal to a pre-defined color, improving the visual effect and overall color performance by adjusting the wavelength range or color coordinate of the blue light, thereby meeting color requirements.
Implementation Method 1
a wavelength conversion material layer covering the blue segment, wherein the wavelength conversion material layer absorbs a part of the blue excitation light and emits a converted light
Data Source
AI summary
A lighting device (100) and a projection device, comprising a light source for generating a blue excitation light (110), a base board (130), and a wavelength conversion material layer (140) covered on the base board (130). The wavelength conversion material layer (140) absorbs a part of the blue excitation light and emits an excited light. The color coordinate of the excited light is within the pre-configured color area, so that a mixed light combined by the excited light and the remaining blue excitation light not absorbed by the wavelength conversion material layer (140) exits the wavelength conversion material layer (140). The color coordinate of the mixed light is closer to the pre-set blue light color coordinate than the color coordinate of the blue excitation light.