Light Source Module Microlens Array Beam Uniformity
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Solution Overview
Problem
Projectors using blue laser diodes face issues with light beam uniformity and wavelength conversion efficiency, leading to poor light beam shaping and low image quality.
Innovation Solution
A light source module incorporating a microlens array to split and uniform the light beam, combined with a wavelength conversion unit and optical path design, enhances beam uniformity and conversion efficiency, allowing for the generation of specific colors like white light in a non-sequential manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If blue laser diodes are used to provide illumination light, then energy conversion efficiency is improved, but light beam uniformity deteriorates
Solution Approach 1:
The patent segments the light beam into multiple sub-beams using a microlens array. The single light beam from the blue laser diode is divided into multiple sub-beams that are then focused onto different regions of the wavelength conversion unit, improving uniformity while maintaining the energy efficiency of the laser diode source.
Solution Approach 2:
The patent applies local quality by using a microlens array to create different optical paths for different regions of the light beam. Each microlens element processes a portion of the beam locally, ensuring uniform energy distribution across the wavelength conversion unit while preserving the overall high efficiency of the laser diode system.
2Use of energy by moving object
If blue laser diodes are used to provide illumination light, then energy conversion efficiency is improved, but light beam shaping capability deteriorates
Solution Approach 1:
The microlens array segments the light beam into multiple sub-beams, each of which can be independently shaped and directed. This segmentation enables precise control over the spatial distribution and shape of the light beam while maintaining the energy efficiency of the laser diode source.
Solution Approach 2:
The microlens array acts as an intermediary between the blue laser diode and the wavelength conversion unit. It mediates the light beam by shaping, uniforming, and directing the sub-beams onto the conversion unit, enabling precise beam shaping while preserving the energy efficiency of the laser diode.
3Adaptability or versatility
If wavelength conversion is used to generate other colors, then color versatility is improved, but conversion efficiency deteriorates
Solution Approach 1:
The patent segments the light beam before wavelength conversion, distributing the energy uniformly across the wavelength conversion unit. This segmentation ensures that the conversion process is as efficient as possible while still achieving the desired color versatility through the conversion of blue light to other wavelengths.
Solution Approach 2:
The patent changes the spatial parameters of the light beam using the microlens array, uniforming the energy distribution before wavelength conversion. This parameter change optimizes the conversion efficiency by ensuring uniform excitation of the wavelength conversion material, while the wavelength conversion itself provides the desired color versatility.
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
Improves wavelength conversion efficiency and image quality by ensuring uniform energy distribution and specific color generation, addressing the limitations of existing projector technologies.
Implementation Method 1
a microlens array disposed corresponding to the light source and configured to uniform the first beam
Implementation Method 2
a wavelength conversion unit configured to convert at least a portion of the first beam focused by the first lens set into a second beam of a second waveband different from the first waveband
Implementation Method 3
a dichroic film disposed on the substrate and partially located between the light-transparent portion and the wavelength conversion layer; the dichroic film is configured to allow the first beam to transmit therethrough and reflect the second beam
Implementation Method 4
a first lens set configured to focus at least a portion of the first beam uniformed by the microlens array
Data Source
AI summary
A light source module for providing an illumination light includes a light source configured to provide a first beam of a first waveband, a microlens array disposed corresponding to the light source and configured to uniform the first beam, a first lens set configured to focus at least a portion of the first beam uniformed by the microlens array, and a wavelength conversion unit configured to convert at least a portion of the first beam focused by the first lens set into a second beam of a second waveband different from the first waveband, wherein the second beam and the first beam not converted by the wavelength conversion unit together form the illumination light.