Light Source Device Auxiliary Diffuser for Projector Color Uniformity
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Solution Overview
Problem
In projector light source devices, differences in image sizes between the excitation light on the wavelength conversion device and the blue light on the diffusing device lead to color unevenness in projected images due to varying illuminance ratios, making it challenging to miniaturize the device while maintaining image quality.
Innovation Solution
A light source device configuration that includes an auxiliary diffusing element between the light source section and the diffusing device, allowing for adjustable image sizes by diffusing the light before it reaches the diffusing device, and using an afocal optical device to extend the optical path of the excitation light, ensuring matching image sizes on both devices and minimizing the device's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the optical path of excitation light is made longer to adjust image size on the wavelength conversion device, then the image size can be matched to the blue light, but the device size increases
Solution Approach 1:
The patent introduces a diffuser that operates in the angular dimension to control the spread of light rays, thereby adjusting the effective image size without increasing the optical path length in the longitudinal dimension. This allows image size matching while maintaining compact device dimensions.
Solution Approach 2:
The diffuser acts as an intermediary element between the light source and the wavelength conversion device, mediating the light path to achieve proper image size matching. By placing the diffuser in the optical path, the system can control the effective focal length and image size without requiring a longer optical path.
2Manufacturing precision
If multiple lenses are disposed to adjust the image size on the wavelength conversion device, then the image size can be matched to the blue light, but the device complexity increases
Solution Approach 1:
The diffuser is designed to serve multiple functions: it diffuses the light from the LED, controls the effective image size on the wavelength conversion device, and simplifies the overall optical path. This multi-functionality eliminates the need for separate lenses, reducing device complexity while maintaining image size matching capability.
Solution Approach 2:
The patent extracts the image size adjustment function from complex multi-lens systems and implements it through a simpler diffuser-based approach. By taking out the unnecessary lenses and retaining only the essential diffusing element, the system achieves the same image size matching with reduced complexity.
3Reliability
If the optical path of blue light is lengthened to match image size with excitation light, then color unevenness is suppressed, but the device size increases
Solution Approach 1:
Instead of lengthening the optical path in the longitudinal dimension, the patent uses the diffuser to control light spread in the angular dimension. This creates an effective virtual extension of the optical path without physically increasing the device length, thereby maintaining color uniformity while suppressing device size increase.
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
This configuration effectively suppresses color unevenness in projected images and allows for the miniaturization of the light source device by adjusting the image sizes and reducing the optical path length, enhancing the projector's performance and compactness.
Implementation Method 1
an auxiliary diffusing element located between the light source section and the diffusing device on an optical path of the blue light, the auxiliary diffusing element diffusing the blue light and causing the blue light to be incident on the diffusing device
Implementation Method 2
a wavelength conversion device on which another portion of the light emitted from the light source section is incident, the wavelength conversion device diffusely emitting converted light at a wavelength different from that of the another portion of the light
Implementation Method 3
a light combining device combining the blue light diffused by the diffusing device with the converted light emitted from the wavelength conversion device
Data Source
AI summary
A light source device includes: a light source section; a diffusing device on which a portion of light emitted from the light source section is incident, the diffusing device diffusely emitting the portion of the light; a wavelength conversion device on which another portion of the light emitted from the light source section is incident, the wavelength conversion device diffusely emitting converted light at a wavelength different from that of the another portion of the light; a light combining device combining the portion of the light diffused by the diffusing device with the converted light emitted from the wavelength conversion device; and an auxiliary diffusing element located between the light source section and the diffusing device on an optical path of the portion of the light, the auxiliary diffusing element diffusing the portion of the light and causing the portion of the light to be incident on the diffusing device.