Laser Projection Device Using 1/4 Wave Plate to Simplify Light Path
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Solution Overview
Problem
Current laser projection devices have a complex light path structure due to the need for a relay loop to steer the laser after transmission through the fluorescent wheel, leading to inefficiencies and increased optical component count.
Innovation Solution
A laser projection device design featuring a laser array, a reflective fluorescent wheel, a dichroic component, and a 1/4 wave plate, where the dichroic component is obliquely disposed to transmit and reflect blue polarized light, and the 1/4 wave plate rotates the polarization of the light to simplify the light path and improve laser utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a relay loop is used to steer the laser after transmission through the fluorescent wheel, then the light path can be controlled, but the structure becomes complex and the number of optical components increases
Solution Approach 1:
The patent combines the laser transmission region and fluorescent region into a single fluorescent wheel component, eliminating the need for separate relay loops. The reflective fluorescent wheel integrates both functions, reducing the number of optical components while maintaining light path control capability.
Solution Approach 2:
The fluorescent wheel is designed to serve multiple functions: it acts as both a laser transmission mirror and a fluorescent conversion element. This multi-functional design eliminates the need for separate relay loops and reduces overall system complexity while maintaining operational control.
2Adaptability or versatility
If a relay loop is used to steer the laser, then light path conversion is achieved, but the number of optical components increases
Solution Approach 1:
The patent merges the relay loop function into the fluorescent wheel by creating a reflective fluorescent wheel that combines laser transmission and fluorescent conversion in one component, thereby reducing the total number of optical components while maintaining light path conversion capability.
Solution Approach 2:
The reflective fluorescent wheel is designed as a universal component that performs both laser transmission and fluorescent conversion functions, eliminating the need for separate relay loops and reducing the quantity of optical components required.
3Illumination intensity
If phosphors are used in the laser light source to generate green light, then green light is emitted through laser excitation, but heat-related issues occur with the reflective fluorescent wheel
Solution Approach 1:
The patent applies a reflective coating to the fluorescent wheel before operation, creating a protective layer that reflects laser light and reduces heat absorption. This preliminary protective measure prevents heat-related issues while maintaining green light emission capability.
Solution Approach 2:
The patent converts the harmful laser light that causes heating into a beneficial reflected light source by applying a reflective coating. The coating that would normally reflect and cause heat issues is instead designed to protect the fluorescent wheel while maintaining the desired green light emission through fluorescent conversion.
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
This design simplifies the light path structure, reduces the number of optical components, and enhances laser utilization by continuously providing laser and fluorescent light to the display chip, improving efficiency and reducing heat-related issues with the reflective fluorescent wheel.
Implementation Method 1
the 1/4 wave plate receives the first blue polarized light from the dichroic component, rotates the polarization of the first blue polarized light by 45 degrees to generate a second blue circularly polarized light
Implementation Method 2
the dichroic component transmits one of the first blue polarized light and the third blue polarized light and can reflect the other
Implementation Method 3
the reflective fluorescent wheel is provided with a laser transmission region and a phosphor-coated fluorescent region; When the laser is irradiated to the fluorescent region, the fluorescent region is excited by the laser to emit a fluorescent light
Data Source
AI summary
For a laser projection device, a dichroic component is disposed on a light emitting path of a laser array for receiving a first blue polarized light from the laser array. A 1/4 wave plate is disposed between a reflective component and the dichroic component and configured to receive the first blue polarized light from the dichroic component, generate a second blue polarized light, and emit the second blue polarized light to the reflective component; and further configured to receive the second blue polarized light reflected by the reflective component, generate a third blue polarized light, and emit the third blue polarized light to the dichroic component. The dichroic component is further configured to receive the third blue polarized light from the 1/4 wave plate and fluorescent light from a reflective fluorescent wheel, and output the third blue polarized light and the fluorescent light in a same light emitting direction.