Laser Projection Combining Lens Group Homogenization
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Solution Overview
Problem
Current laser projection technologies face challenges in efficiently combining and projecting laser beams of different colors to achieve high luminance and miniaturization, while maintaining long service life and reducing the size of the beam spot to improve light homogenization and display effects.
Innovation Solution
A laser projection apparatus comprising a laser source with a combining lens group and polarization conversion component, along with a light modulation assembly and projection lens, which includes multiple light-emitting components arranged in arrays to emit and combine laser beams of different colors, and a polarization conversion component to adjust polarization directions, enhancing beam combination and homogenization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple laser beams of different colors are combined using a combining lens group, then the beam spot size is reduced and light homogenization is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple laser beams of different colors (red, green, blue) emitted by separate light-emitting components into a single integrated beam path using a combining lens group. This merging process consolidates multiple optical paths into one, reducing the overall device footprint while achieving uniform light distribution across the beam spot.
Solution Approach 2:
The combining lens group acts as an intermediary optical element that receives divergent laser beams from different light-emitting components and transforms them into a unified, homogeneous beam. The lens group mediates the combination process by adjusting beam paths and focusing all colors to a common spot, thereby simplifying the overall optical architecture.
2Manufacturing precision
If a polarization conversion component is added to change polarization directions, then display quality is enhanced, but the device complexity and size increase
Solution Approach 1:
The polarization conversion component changes the polarization state parameter of laser beams from a single direction to multiple directions. By adjusting the polarization angle parameter, the system creates orthogonal polarization components that improve color rendering and display quality without requiring complex spatial arrangements.
Solution Approach 2:
Instead of expanding the device in spatial dimensions to improve display quality, the patent introduces a new dimension - polarization orientation. By converting polarization directions to orthogonal states, the system achieves enhanced display performance within the same physical footprint, effectively adding a new degree of freedom to the optical system.
3Manufacturing precision
If light modulation assembly with fly-eye lens group is used to homogenize beams, then light distribution uniformity is improved, but the device complexity increases
Solution Approach 1:
The fly-eye lens group divides the incident laser beam into multiple smaller sub-beams through an array of micro-lenses. This segmentation creates a honeycomb pattern of light spots that uniformly covers the target area, transforming a single large beam into multiple distributed smaller beams for homogeneous illumination.
Solution Approach 2:
The fly-eye lens group creates multiple copies of the incident beam profile across the output plane. Each micro-lens acts as a copy mechanism, replicating the beam structure at different positions to form a uniform distribution pattern, thereby achieving homogenization through repeated optical copying.
4Volume of moving object
If multi-chip laser devices are used to achieve miniaturization, then device size is reduced, but beam combination precision becomes more difficult to maintain
Solution Approach 1:
The combining lens group merges the output beams from multiple miniaturized light-emitting components into a single unified beam path. By consolidating the optical paths of separate chips into one integrated stream, the system maintains beam combination precision despite the compact size and close proximity of the individual light sources.
Solution Approach 2:
The combining lens group serves as an intermediary that compensates for the spatial separation and alignment challenges of multi-chip laser devices. It receives the divergent beams from the miniaturized components and transforms them into a precise, unified beam, thereby maintaining combination accuracy within a compact form factor.
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 effectively combines and projects laser beams of different colors, reducing the size of the beam spot, improving light homogenization, and enhancing display quality, while maintaining the advantages of long service life and miniaturization.
Implementation Method 1
The combining lens group is located on a laser-exit side of the laser device. The combining lens group is configured to combine the laser beams of different colors emitted by the light-emitting group to a same position and propagate the combined laser beam in a preset direction.
Implementation Method 2
The polarization conversion component is located on the laser-exit side of the laser device and configured to change a polarization direction of a portion of the laser beam of at least one color, so that the laser beam of the at least one color has different polarization directions.
Implementation Method 3
The fly-eye lens group is located on a laser-exit side of the laser source and configured to homogenize the incident laser beam.
Data Source
AI summary
A laser projection apparatus includes a laser source, a light modulation assembly, and a projection lens. The laser source includes a laser device, a combining lens group, and a polarization conversion component. The combining lens group is located on a laser-exit side of the laser device and configured to combine laser beams of different colors emitted by a light-emitting group to a same position and propagate the combined laser beam in a preset direction. The polarization conversion component is configured to change a polarization direction of a portion of the laser beam of at least one color. The light modulation assembly includes a fly-eye lens group. The fly-eye lens group is located on a laser-exit side of the laser source and configured to homogenize the incident laser beam.