Tri-Color Laser Projection Lighting for Speckle and Brightness Balance
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Solution Overview
Problem
Existing laser projectors face issues with speckle and brightness limitations due to the size of packaging, particularly in lighting systems using pure laser beams, which hinder optimal light source performance.
Innovation Solution
A lighting system incorporating a laser light source module that provides blue, green, and red laser beams, a wavelength converter to generate an excitation beam, a segmented dichroic mirror to reflect and direct these beams, and a light homogenizing component to improve illumination, along with a projection device that includes a light modulation system and projection lens to enhance image projection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If pure laser beams are used for illumination, then brightness can be maintained, but laser speckle occurs and packaging size becomes large
Solution Approach 1:
The patent segments the laser beam into multiple wavelengths (red, green, blue) and processes each wavelength separately through dedicated optical paths. The segmented dichroic mirror divides the combined laser beam into three separate wavelength channels, allowing independent control and processing of each color component. This segmentation enables the system to maintain high brightness while reducing speckle by treating different wavelengths independently before recombining them.
Solution Approach 2:
The patent combines multiple laser wavelengths (red, green, blue) into a single illumination beam that passes through the same optical path to the display panel. By merging these different wavelength beams, the system achieves full-color illumination with high brightness while the combined beam benefits from reduced speckle effects compared to single-wavelength lasers.
2Volume of moving object
If packaging size is reduced, then device compactness improves, but brightness is limited
Solution Approach 1:
The patent uses a single optical path that handles multiple wavelengths (red, green, blue) simultaneously, making the illumination system multi-functional. The same optical components (beam expander, spatial light modulator, projection lens) process all three wavelengths, eliminating the need for separate optical paths for each color. This universality reduces packaging size while maintaining high brightness through the combined laser wavelengths.
3Volume of moving object
If tri-color laser beams are combined and passed through the same optical path, then packaging size is reduced and brightness is improved, but speckle may occur
Solution Approach 1:
The patent employs temporal modulation of the laser beams, where the red, green, and blue laser wavelengths are activated in periodic sequences rather than continuously simultaneously. The laser driver controller modulates each wavelength channel in a time-division manner, which helps reduce speckle effects by interrupting the coherent light delivery periodically while maintaining high brightness through the combined duty cycle of all channels.
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 design addresses speckle issues and provides superior illumination and projection effects by combining tri-color laser beams, improving brightness and homogeneity through the use of a wavelength converter and dichroic mirror system.
Implementation Method 1
a wavelength converter positioned in transmission paths of the red laser beam, the green laser beam, and the blue laser beam, where the wavelength converter is used to reflect the red laser beam, the green laser beam, and the blue laser beam, and the wavelength converter is adapted to convert the blue laser beam to produce an excitation beam
Implementation Method 2
a segmented dichroic mirror positioned in the transmission paths of the red laser beam, the green laser beam, the blue laser beam, and the excitation beam, and located between the laser light source module and the wavelength converter, where the segmented dichroic mirror is used to reflect the red laser beam, the green laser beam, the blue laser beam, and at least a portion of the excitation beam coming from the wavelength converter
Implementation Method 3
a light homogenizing component positioned in the transmission paths of the red laser beam, the green laser beam, the blue laser beam, and at least a portion of the excitation beam, configured to receive and homogenize the red laser beam, the green laser beam, the blue laser beam, and at least a portion of the excitation beam from the segmented dichroic mirror to provide an illumination beam
Data Source
AI summary
The present invention provides a lighting system that combines tri-color pure lasers and phosphors and a projection device thereof. The lighting system helps to improve the phenomenon of laser speckle and includes a laser light source module, a wavelength converter, a segmented dichroic mirror, and a light homogenizing component. The laser light source module is configured to provide blue, green, and red laser beams. The wavelength converter is configured to reflect the tri-color laser beams and convert the blue laser beam into an excitation beam. The segmented dichroic mirror is configured to reflect the tri-color laser beams and at least a portion of the excitation beam from the wavelength converter. The light homogenizing component is configured to receive and homogenize the tri-color laser beams and at least a portion of the excitation beam from the segmented dichroic mirror to provide an illumination beam.