Light Source Module Speckle Reduction via Beam Segmentation
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Solution Overview
Problem
Current projection technologies face issues with speckle phenomena and non-uniformity of light sources, which affect the optical quality of projection systems.
Innovation Solution
A light source module comprising a light emitting element and a light splitting module, which includes a light splitting element, an optical element, and a reflective element, converts the light beam into multiple beams with equal energy and varying polarization states, reducing speckle and enhancing optical effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single light source is used to provide illumination, then the structure is simple, but speckle phenomenon occurs and light uniformity is poor
Solution Approach 1:
The single light beam is divided into multiple light splitting beams through a light splitting module containing light splitting elements (beam splitters). This segmentation approach transforms one coherent beam into multiple separate beams, which reduces the speckle phenomenon by distributing the coherent light across multiple spatial paths while maintaining relatively simple overall structure.
2Device complexity
If a single light source is used to provide illumination, then the structure is simple, but light uniformity is poor
Solution Approach 1:
The illumination system segments the single light source into multiple light splitting beams that can be independently controlled and distributed. This allows for better spatial distribution of light across the illumination area, improving uniformity while keeping the overall system structure relatively simple through the use of beam splitting optics.
Solution Approach 2:
Different regions of the illumination system receive light with different polarization states and intensities through the light splitting module. By adjusting the local properties of each light splitting beam (such as polarization orientation and intensity distribution), the overall light uniformity across the illumination area is improved while maintaining structural simplicity.
3Device complexity
If light beams with same polarization state are used, then the optical system is simple, but speckle phenomenon is severe
Solution Approach 1:
The light splitting module changes the polarization state parameter of the light beams by introducing optical elements (such as wave plates or polarizers) that modify the polarization orientation of different light splitting beams. This parameter variation reduces speckle phenomenon while maintaining relatively simple optical system structure through the use of standard optical components.
4Object-affected harmful factors
If multiple light splitting beams with different polarization states are generated, then speckle is reduced, but device complexity increases
Solution Approach 1:
The light splitting module uses multiple beam splitters arranged in a segmented configuration to generate multiple light splitting beams with different polarization states. This segmentation approach reduces speckle by distributing coherent light across multiple paths while controlling device complexity through modular arrangement of standard optical components.
Solution Approach 2:
Optical elements within the light splitting module modify the polarization parameters of different light beams to create diversity in polarization states. This parameter change approach reduces speckle phenomenon while maintaining manageable device complexity by using conventional optical elements in a structured configuration.
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 reduces the speckle phenomenon and improves the optical performance of the illumination system in projection devices by ensuring equal energy distribution and diverse polarization states among the light splitting beams.
Implementation Method 1
The first light splitting element is disposed on a transmission path of the first beam to divide the first beam into a first light splitting beam and a second beam
Implementation Method 2
The first optical element is disposed on a transmission path of the second beam, and is configured to change a polarization state of the second beam
Implementation Method 3
The reflective element is disposed on a transmission path of the first light splitting beam or a transmission path of at least part of the second beam
Data Source
AI summary
Provided is a light source module, including a light emitting element and a light splitting module. The light emitting element provides a first beam. The light splitting module converts the first beam into multiple light splitting beams. The light splitting module includes a first light splitting element, a first optical element, and a reflective element. The first light splitting element is configured to divide the first beam into a first light splitting beam and a second beam. The first optical element is disposed on a transmission path of the second beam, and is configured to change a polarization state of the second beam. The reflective element is disposed on a transmission path of the first light splitting beam or a transmission path of at least part of the second beam. The light splitting beams include the first light splitting beam and the at least part of the second beam.