Light Source Module Speckle Elimination via Reflector
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Solution Overview
Problem
Conventional techniques for eliminating speckle patterns in laser light projection systems are inefficient, particularly in limited spaces or with cost constraints, as they require increased diffuser angles or reduced numbers of diffusers, leading to degraded efficiency and uneven image rendering.
Innovation Solution
A light source module comprising a light source, a wavelength conversion unit, a diffuser, and a reflector, where the reflector is positioned on the second side of the diffuser to allow the excitation light to pass through the diffuser twice, enhancing speckle elimination without the need for multiple diffusers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the number of diffusers is reduced to lower cost, then the cost is reduced, but the speckle elimination effect is weakened and the rendered image is uneven
Solution Approach 1:
The patent makes the excitation light pass through the diffuser multiple times (at least twice) by using a reflector to redirect the light back through the diffuser. This continuous action of the light through the same diffuser achieves speckle elimination equivalent to using multiple diffusers, thereby reducing the number of diffusers needed while maintaining image uniformity
2Volume of moving object
If the space is limited, then the compactness is improved, but it is necessary to increase the inclination angle of the diffuser which degrades the efficiency
Solution Approach 1:
The patent introduces a reflector to change the optical path from a linear arrangement to a folded arrangement, allowing the light to traverse the diffuser multiple times within a compact space. This dimensional change in the light path enables space efficiency without requiring increased diffuser inclination angles, thereby maintaining efficiency
3Quantity of substance
If the number of diffusers is reduced to lower cost, then the quantity of components is reduced, but the speckle elimination effect is weakened
Solution Approach 1:
The patent makes the excitation light pass through the diffuser multiple times (at least twice) by using a reflector to redirect the light back through the diffuser. This continuous action of the light through the same diffuser achieves speckle elimination equivalent to using multiple diffusers, thereby reducing the number of diffusers needed while maintaining image uniformity
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 light source module effectively eliminates speckle patterns with a reduced number of diffusers, maintaining efficiency and image quality, even in space-constrained environments.
Implementation Method 1
The wavelength conversion unit is configured to reflect the excitation light... The wavelength conversion unit is further configured to convert the excitation light into excited light
Implementation Method 2
a diffuser to homogenize the laser light... a single wavelength of light scattered at each point on the rough surface overlaps irregularly
Implementation Method 3
The reflector is configured to reflect the excitation light entering the diffuser, so that the excitation light propagates from the second side to the first side and leaves the diffuser
Implementation Method 4
The dichroic sheet is configured to transmit the excitation light and reflect the excited light
Data Source
AI summary
A light source module includes a light source, a wavelength conversion unit, a diffuser, and a reflector. The light source is configured to emit excitation light. The wavelength conversion unit is configured to reflect the excitation light. The diffuser has a first side and a second side opposite to each other, and is configured to allow the excitation light reflected by the wavelength conversion unit to enter the diffuser from the first side and reach the second side. The reflector is configured to reflect the excitation light entering the diffuser, so that the excitation light propagates from the second side to the first side and leaves the diffuser.