Projection Device Wavelength Conversion Segmentation
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Solution Overview
Problem
Laser projectors face color impurity issues due to unconverted laser beams being transmitted to light valves, affecting image quality.
Innovation Solution
A projection device incorporating a wavelength conversion element with distinct regions, a diffuser element, a filter element, and beam splitting elements to guide and filter laser beams, ensuring only converted beams reach the light valves, thereby maintaining light purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a wavelength conversion element is used to convert laser beam to excited beam, then the image brightness is improved, but color impurity occurs due to unconverted laser beam transmission
Solution Approach 1:
The wavelength conversion element is divided into a wavelength conversion region and a non-wavelength conversion region. The laser beam path is segmented to pass through both regions sequentially, allowing unconverted laser beams to be separated from the converted excited beams, thereby resolving the color impurity issue while maintaining image brightness.
Solution Approach 2:
The harmful unconverted laser beams are extracted and separated from the useful excited beams using the beam splitting element. This extraction process removes the color impurity source while preserving the converted light for image formation.
2Manufacturing precision
If filter element is added to filter out unconverted laser beam, then light purity is improved, but device complexity increases
Solution Approach 1:
A beam splitting element is introduced as an intermediary component that optically separates the unconverted laser beams from the converted excited beams. This mediator approach achieves light purification through optical path division rather than requiring additional filter elements, thereby maintaining device simplicity while improving light purity.
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 filters out unconverted laser beams, enhancing image quality by maintaining good light purity and reducing color impurities in projected images.
Implementation Method 1
a laser light source for exciting a phosphor material on a phosphor wheel to emit an excited beam (such as a yellow beam)
Implementation Method 2
The filter element is configured to filter out the laser beam
Implementation Method 3
The diffuser element is disposed downstream in an optical path of the wavelength conversion element
Implementation Method 4
the beam splitting element is configured to guide a first sub-beam and a second sub-beam in a first beam passing through the first region of the diffuser element and the filter element respectively to the first light valve and the second light valve
Data Source
AI summary
Provided is a projection device including a laser light source, a wavelength conversion element having wavelength and non-wavelength conversion regions, a diffuser element having first and second regions, a filter element, a beam splitting element, a first light valve, a second light valve, and a projection lens. During simultaneous rotation of the diffuser element and the wavelength conversion element, the first and second regions correspond respectively to the wavelength and non-wavelength conversion regions. The filter element is disposed in the first region, filtering out a laser beam emitted by the laser light source. The beam splitting element guides first and second sub-beams in a first beam passing through the first region of the diffuser element and the filter element respectively to the first and second light valves, and guides a second beam passing through the second region of the diffuser element to one of the first and second light valves.