Rotating Wavelength Conversion Substrate for Compact Projection Light Sources
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Solution Overview
Problem
Current projection devices face challenges in maximizing light source brightness and reducing occupied space, particularly due to low red light efficiency and the need for additional components like shading films and color wheels, which increase complexity and size.
Innovation Solution
A wavelength conversion device with a rotating substrate featuring non-perpendicular side surfaces and regions for reflecting and scattering incident laser light, incorporating wavelength conversion material layers and diffusers to enhance light conversion efficiency and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If different phosphors are coated on a color wheel with shading films for filtering, then fluorescence of different colors can be generated, but the red light efficiency is low and the brightness of the light source cannot be maximized
Solution Approach 1:
The patent extracts and removes the shading film component from the system. Instead of using shading films to filter fluorescence, the invention directly uses phosphors coated on the color wheel to generate the desired colors, eliminating the energy loss associated with filtering and thereby maximizing red light efficiency and overall brightness
Solution Approach 2:
The patent changes the optical parameters by eliminating the filtering stage. By directly emitting fluorescence from phosphors without intermediate filtering, the system improves energy efficiency and brightness output, particularly for red light where filtering causes significant energy loss
2Illumination intensity
If a red laser light source is added and another color wheel is used for light scattering, then the proportion of red light efficiency in white balance color gamut can be increased, but the space occupied by the overall structure increases
Solution Approach 1:
The patent merges the functions of multiple components into a single integrated color wheel structure. The phosphors are directly coated on the color wheel, combining the light scattering function of the color wheel with the wavelength conversion function of phosphors in one component, thereby increasing red light efficiency without adding extra space
Solution Approach 2:
The color wheel is designed to perform multiple functions simultaneously: it scatters light and converts wavelengths through phosphor coating. This multi-functional design eliminates the need for separate red laser sources and additional color wheels, achieving high red light efficiency while maintaining a compact structure
3Reliability
If shading films are added at inner or outer side of the color wheel for filtering fluorescence, then the desired colors can be obtained, but the structure complexity and occupied space increase
Solution Approach 1:
The patent extracts and removes the shading film filtering stage from the optical path. By relying on the phosphors to directly emit the desired wavelengths, the system achieves accurate colors without the need for additional filtering components, thereby reducing structural complexity while maintaining color accuracy
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 increases light source brightness while reducing the overall structure's size by effectively reflecting and scattering laser light, thereby improving red light efficiency and achieving a more compact design.
Implementation Method 1
A wavelength conversion material layer is provided on the first surface
Implementation Method 2
the side surface includes a first region and a second region that are configured to reflect an incident light beam
Data Source
AI summary
A wavelength conversion device and a light-emitting device and a projection device using the wavelength conversion device are provided. The wavelength conversion device includes a substrate capable of rotating around a rotating shaft, the substrate includes a first surface and a second surface opposite to each other, and an annular side surface, which is formed between the first surface and the second surface and is not perpendicular to the first surface. The first surface is provided with a wavelength conversion material layer, and the annular side surface includes a first area and a second area. The first area and the second area are used to reflect incident light beams.