Laser Source Beam Combining for Spot Coincidence and Color Uniformity
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Solution Overview
Problem
Existing laser projection technologies face challenges in achieving high coincidence degree and color uniformity of beam spots, leading to suboptimal projection effects due to differences in divergence angles and polarization directions of laser beams.
Innovation Solution
A laser source with a combining lens group and a beam spot angle guiding component or polarization direction changing structure is employed to adjust the divergence angle and polarization direction of laser beams, ensuring they overlap and combine effectively, thereby improving beam spot coincidence and color uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If laser beams with different divergence angles are combined directly, then the beam combining process is simple, but the coincidence degree and color uniformity of beam spots deteriorate
Solution Approach 1:
The patent changes the divergence angle parameter of laser beams by introducing a beam spot angle guiding component. This component adjusts the divergence angles of different laser beams to be consistent, enabling them to overlap and combine effectively on the combining lens group, thereby improving beam spot coincidence degree and color uniformity without excessive complexity
Solution Approach 2:
The beam spot angle guiding component acts as an intermediary between the laser beam source and the combining lens group. It mediates the divergence angle differences between different laser beams, transforming them into consistent angles that facilitate effective combination and overlap on the combining lens group
2Device complexity
If laser beams with different polarization directions are combined directly, then the combining process is simple, but the color uniformity and projection quality deteriorate
Solution Approach 1:
The patent changes the polarization direction parameter of laser beams by introducing a polarization direction changing structure. This structure adjusts the polarization directions of different laser beams to be consistent, enabling effective combination and improving color uniformity and projection quality
Solution Approach 2:
The polarization direction changing structure acts as an intermediary between the laser beam source and the combining lens group. It mediates the polarization direction differences between different laser beams, transforming them into consistent polarization directions that facilitate effective combination
3Device complexity
If beam spots with different sizes are combined, then the combining process is simple, but the coincidence degree and projection image quality deteriorate
Solution Approach 1:
The patent changes the size parameter of beam spots by adjusting the divergence angles through the beam spot angle guiding component. By making divergence angles consistent, the beam spots naturally overlap better and achieve more uniform sizes, improving coincidence degree and projection image quality
Solution Approach 2:
The patent addresses beam spot size differences by operating in the angular domain rather than directly in the spatial domain. By adjusting divergence angles (angular parameter), the beam spots achieve better spatial overlap and size uniformity on the combining lens group
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 enhances the coincidence degree and color uniformity of beam spots, resulting in improved projection quality and reduced speckle effects, enhancing the overall projection image quality.
Implementation Method 1
The first combining lens group is configured to combine the laser beams emitted by the first laser device and propagate the combined laser beams in a first direction
Implementation Method 2
The second combining lens group is configured to reflect the second type laser beam emitted by the second laser device in the first direction
Data Source
AI summary
A laser source includes a laser device, a combining lens group, and a beam spot angle guiding component. The laser device includes a first laser device and a second laser device. The first laser device is configured to emit a first type laser beam and a second type laser beam. The second laser device is configured to emit the second type laser beam. The combining lens group includes a first combining lens group and a second combining lens group. The first combining lens group is configured to emit the laser beams emitted by the first laser device in a first direction. The second combining lens group is configured to reflect the laser beam. The beam spot angle guiding component is configured to change a divergence angle of at least one of the first type laser beam or the second type laser beam.