Fly-Eye Lens NA Optimization for Laser Light Homogenization
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Solution Overview
Problem
Current laser projection systems with multiple color laser chips suffer from poor light spot uniformity and color performance due to differing optical properties of laser beams, leading to suboptimal display on projection screens.
Innovation Solution
A laser light source apparatus with laser chips arranged in line, featuring a fly-eye lens component with microlenses arranged in an array, where the NA value in the slow axis direction is less than that of the microlenses in both dimensions, optimizing the homogenization of laser light by adjusting the divergence angles and Lagrangian invariants of the laser beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple different colors of laser chips are integrated in a laser device, then full-color display capability is achieved, but light spot uniformity and color performance deteriorate due to different optical properties of laser beams
Solution Approach 1:
The patent segments the laser light path by introducing a fly-eye lens component with multiple microlenses. Each microlens processes a portion of the laser beam from different laser chips, dividing the complex multi-color laser integration into manageable segments that can be individually optimized for uniformity while maintaining full-color capability
Solution Approach 2:
The fly-eye lens component acts as an intermediary between the multiple laser chips and the projection lens. This intermediary structure with specifically designed NA values and Lagrangian invariants mediates the optical properties of different laser beams, harmonizing their different optical characteristics to achieve uniform light spots and consistent color performance
2Adaptability or versatility
If laser chips with different optical properties are used, then color variety is improved, but light-combining performance deteriorates
Solution Approach 1:
The patent applies local quality by designing the fly-eye lens component with different NA values for different directions (slow axis and fast axis). The NA value in the slow axis direction is specifically optimized to be less than the NA value of microlenses in both first and second dimensional directions, creating direction-specific optical properties that optimize light combining for each laser color while maintaining overall color variety
Solution Approach 2:
The patent changes key optical parameters including NA values and Lagrangian invariants of the fly-eye lens component to optimize light-combining performance. By carefully selecting parameters where the NA value in the slow axis direction is less than the NA value of microlenses in both dimensions, and by optimizing the Lagrangian invariant ratio between fast and slow axes, the system achieves improved light combining efficiency while preserving multi-color capability
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 homogenization of laser light, improving the uniformity and brightness of the projection, resulting in better color performance and display quality on projection screens.
Implementation Method 1
a fly-eye lens component disposed in a light path of the laser device, wherein the fly-eye lens component includes a plurality of microlenses arranged in an array
Data Source
AI summary
Provided is a laser light source apparatus, including a laser device and a fly-eye lens component. The laser includes at least two different colors of laser chips. The fly-eye lens component includes a plurality of microlenses arranged in an array. Each of the microlenses extends along a first dimensional direction and a second dimensional direction. A laser spot emitted from the laser device to a light-incident side of the fly-eye lens component has a smaller NA value in a slow axis direction than an NA value of at least one of the microlenses in the first dimensional direction, and has a smaller NA value in the fast axis direction than the NA value of at least one of the microlenses in the second dimensional direction.