Laser Projection Illumination With Polarization-Split Light Routing
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Solution Overview
Problem
Current illumination systems in projection devices suffer from reduced light efficiency due to energy loss in the yellow-green fluorescent band when using dichroic elements to guide additional red and green lasers, leading to poor quality of projected images.
Innovation Solution
An illumination system incorporating a laser light source, wavelength conversion element, and a light splitting element that selectively passes or reflects light beams based on wavelength and polarization state, optimizing the transmission path to improve light usage efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If additional red lasers and green lasers are used as supplementary light sources to improve optical effects, then the quality of projected picture is improved, but the dichroic element loses energy in the yellow-green fluorescent band, reducing light efficiency
Solution Approach 1:
The patent segments the light beam management by using a polarizing beam splitter to separate light paths based on polarization state. The yellow-green fluorescent light and supplementary red/green laser light are directed along different paths, allowing independent optimization of each light source without energy loss through the dichroic element.
Solution Approach 2:
The patent introduces a polarizing beam splitter as an intermediary element between the light sources and the projection system. This mediator enables selective routing of different light beams based on their polarization characteristics, resolving the conflict between maintaining high light efficiency and achieving superior optical effects.
2Adaptability or versatility
If a dichroic element is used to guide additional red laser and green laser, then the optical effects are improved, but energy is lost in part of the yellow-green fluorescent band
Solution Approach 1:
The patent applies local quality by optimizing the optical path for different light sources separately. The polarizing beam splitter creates distinct transmission and reflection paths tailored to the specific polarization characteristics of each light source, allowing each component to operate at its optimal performance without compromising others.
Solution Approach 2:
The patent changes the parameter of light routing from wavelength-based (dichroic) to polarization-based (polarizing beam splitter). This parameter change enables the system to guide supplementary lasers while preserving yellow-green fluorescent light efficiency, as the routing decision is based on polarization state rather than wavelength.
3Use of energy by moving object
If blue lasers are used to excite yellow-green fluorescent light as the source of illumination light beam, then the illumination system is established, but additional red and green lasers are needed for better optical effects, increasing system complexity
Solution Approach 1:
The patent makes the polarizing beam splitter a universal component that handles multiple light sources (blue laser, yellow-green fluorescent light, red laser, green laser) through a single element. This multi-functional approach consolidates what would otherwise require multiple separate beam splitting components, reducing overall system complexity while maintaining the capability to manage all light sources effectively.
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
Enhances light collection efficiency by minimizing energy loss through selective light beam management, resulting in improved optical effects and image quality.
Implementation Method 1
The wavelength conversion element is configured on a transmission path of the laser beam. The wavelength conversion element is used to convert the laser beam into a converted light beam.
Implementation Method 2
The light splitting element allows the laser beam with a wavelength within the first wavelength range to pass through, allowing the first supplementary light beam with a wavelength within the second wavelength range and having the first polarization state to pass through, and reflecting the converted light beam with a wavelength within the second wavelength range and having the second polarization state.
Data Source
AI summary
An illumination system includes a laser light source, a wavelength conversion element, a first supplementary light source and a light splitting element. The laser light source is used to provide a laser beam. The wavelength conversion element is used to convert the laser beam into a converted light beam. The first supplementary light source is used to provide a first supplementary light beam. The light splitting element meets one of the following conditions: (1) allowing the laser beam to pass through, allowing the first supplementary light beam with the first polarization state to pass through, and reflecting the converted light beam with the second polarization state; or (2) reflecting the laser beam, reflecting the first supplementary light beam having the second polarization state, and allowing the converted light beam having the first polarization state to pass through.