Reflective Sheet With Wavelength Conversion Layer for LED Lighting
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Solution Overview
Problem
Existing LED lighting technologies suffer from reduced light efficiency due to reflected light being returned to the LED without wavelength conversion or scattering, limiting the ability to emit various colors and increasing heat generation, which shortens the device's lifespan and complicates manufacturing.
Innovation Solution
A lighting device with a reflective sheet that includes a wavelength conversion layer and scattering material, allowing reflected light to be wavelength-converted and scattered back to the lighting cover, enhancing light efficiency and enabling the emission of various colors without the need for resin or phosphor materials, thus simplifying the manufacturing process and improving heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a diffusion plate is used to convert point light source to surface light source, then light diffusion is improved, but light transmission is reduced and light efficiency deteriorates
Solution Approach 1:
The lighting device is divided into separate functional components: LED light sources, diffusion plates for specific areas, and reflective plates positioned at the bottom. This segmentation allows light to be diffused where needed while reflected back to maintain overall efficiency, resolving the contradiction between local diffusion needs and global light efficiency.
Solution Approach 2:
A reflective plate is introduced as an intermediary component between the LED light sources and the diffusion plate. This mediator reflects transmitted light back through the diffusion plate, enabling light diffusion to be achieved without permanent light loss, thus maintaining efficiency while providing the desired illumination distribution.
2Loss of energy
If a reflective plate is added to reflect light back to the diffusion plate, then light efficiency is improved, but device complexity increases
Solution Approach 1:
The bottom surface of the lighting device is designed to serve dual purposes: it acts as both a mounting surface for LED light sources and as a reflective surface. This multi-functionality eliminates the need for a separate reflective plate component, maintaining light efficiency while avoiding increased structural complexity.
Solution Approach 2:
The reflective function is merged with the existing bottom surface structure of the lighting device. By combining the reflective function with the mounting surface, the design avoids adding separate components, thus improving light efficiency without increasing device complexity.
3Ease of manufacture
If wavelength conversion and scattering are not applied to reflected light, then manufacturing is simplified, but light efficiency deteriorates and heat generation increases
Solution Approach 1:
The reflective plate undergoes parameter changes by incorporating wavelength conversion materials (such as phosphors) and scattering materials. These parameter modifications enable the reflective plate to convert reflected light wavelengths and scatter light directions, improving light efficiency and reducing heat generation while maintaining manufacturing feasibility through conventional material incorporation techniques.
4Illumination intensity
If resin or phosphor materials are used for wavelength conversion, then color emission is improved, but manufacturing complexity and defect rates increase
Solution Approach 1:
Instead of applying phosphor materials directly to LED chips (which adds manufacturing complexity), the wavelength conversion function is copied to the reflective plate. The reflective plate contains wavelength conversion materials that perform the same color conversion function, but can be manufactured and applied as a separate component, simplifying the overall manufacturing process and reducing defect rates.
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 improves light efficiency by minimizing light loss and allowing for the emission of various colors, extends the device's lifespan by reducing heat-related issues, and simplifies the manufacturing process by omitting the need for encapsulants, resulting in reduced defect rates and lower manufacturing costs.
Implementation Method 1
a reflective sheet arranged on a light source mounting surface of the lighting unit and reflecting reflected light reflected from the lighting cover back toward the lighting cover
Implementation Method 2
wavelength conversion layer for converting a wavelength of the reflected light reflected from the lighting cover may be laminated on the reflective sheet
Implementation Method 3
the reflective sheet may include a mixed layer in which wavelength conversion material for converting a wavelength of the reflected light reflected from the lighting cover and a scattering material for scattering the reflected light may be mixed
Data Source
AI summary
A lighting device is provided. The lighting device includes: a lighting unit in which a plurality of light sources are mounted; a lighting cover installed to be spaced apart from the lighting unit; and a reflective sheet arranged on a light source mounting surface of the lighting unit and reflecting reflected light reflected from the lighting cover back toward the lighting cover, wherein wavelength conversion layer for converting a wavelength of the reflected light reflected from the lighting cover is laminated on the reflective sheet.