Illumination System Beam Direction Redirection for Color Uniformity
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Solution Overview
Problem
The use of packaged laser modules in projection devices leads to non-uniform angular and spatial distribution of beams, resulting in non-uniform color lighting in projected images due to the lack of even illumination.
Innovation Solution
An illumination system comprising a first and second light source module and a light combining module, where the light combining module changes the transmission direction of beams from the first and second modules, ensuring they exit perpendicular to each other, forming a symmetrical angular and spatial distribution, thereby enhancing color uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple packaged laser modules are used to increase brightness, then the brightness of the image beam is improved, but the angular and spatial distribution of beams becomes non-uniform
Solution Approach 1:
The illumination system is divided into multiple independent light source modules (first light source module, second light source module, etc.), each generating beams that are subsequently combined. This segmentation allows each module to contribute to overall brightness while the light combining module ensures uniform angular and spatial distribution by integrating beams from different directions.
Solution Approach 2:
The light combining module merges beams from multiple light source modules by changing their transmission directions. Beams from the first light source module are redirected from a first direction to a third direction, while beams from the second light source module are redirected from a second direction to the third direction, creating a unified illumination beam with symmetric angular and spatial distribution.
2Illumination intensity
If multiple light source modules are combined to increase illumination, then the brightness is improved, but the color uniformity of the projected image deteriorates
Solution Approach 1:
The light combining module redirects beams from different spatial dimensions (first direction, second direction) to a common third direction. This dimensional transformation ensures that beams from multiple light source modules with different color compositions are uniformly distributed in the final illumination beam, improving color uniformity while maintaining increased brightness.
3Quantity of substance
If beams from multiple light source modules are directly combined, then the total illumination is increased, but the angular distribution becomes non-uniform
Solution Approach 1:
The light combining module applies different directional transformations to beams from different light source modules. The first light source module's beams are redirected from a first direction to a third direction, while the second light source module's beams are redirected from a second direction to the third direction. This localized directional control ensures uniform angular distribution in the combined illumination beam.
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 achieves better color and brightness uniformity in the illumination beam and image beam, reducing etendue and increasing brightness, while maintaining axisymmetric light distribution.
Implementation Method 1
The light combining module is configured to change a transmission direction of the first beam from the first direction to a second direction and then to a third direction
Implementation Method 2
The light combining module is configured to change a transmission direction of the first beam from the first direction to a second direction and then to a third direction
Implementation Method 3
The light combining module is configured to change a transmission direction of the second beam from the second direction to the third direction
Implementation Method 4
The light combining module is configured to change a transmission direction of the second beam from the second direction to the third direction
Data Source
AI summary
An illumination system, including a first light source module, a second light source module, and a light combining module, is provided. A first beam from the first light source module is transmitted along a first direction. The light combining module changes a transmission direction of the first beam from the first direction to a second direction and then to a third direction, and the first beam leaves the light combining module. A second beam from the second light source module is transmitted along the second direction. The light combining module changes a transmission direction of the second beam from the second direction to the third direction, and the second beam leaves the light combining module. An illumination beam is formed after the first beam and the second beam leave the light combining module. A projection device is also provided.