Polarized Light Illumination System Using Time-Sharing Switching
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Solution Overview
Problem
Current illumination systems for projection devices, utilizing solid-state light sources, face challenges in minimizing size and production cost while efficiently utilizing polarized light beams.
Innovation Solution
The implementation of a polarized light source with a polarization switching element, beam splitting element, wavelength conversion element, reflective element, and wave plate, which switches and splits polarized light beams to different directions, converts them to alternate colors, and combines them using a time-sharing method to form an illumination light beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional illumination systems use multiple separate light sources and optical elements, then the illumination coverage and color rendering are improved, but the device size and structural complexity increase
Solution Approach 1:
The patent combines multiple light sources (first and second light sources with different colors) into a single integrated illumination system with a unified optical path. The controller coordinates both light sources to work together, achieving comprehensive illumination coverage while reducing structural complexity compared to separate illumination systems.
Solution Approach 2:
The illumination system is designed to perform multiple functions using a single integrated structure. It can illuminate different areas (first and second areas) with different colors, adjust illumination intensity ratios, and adapt to various display scenarios, thereby reducing the need for multiple separate devices.
2Volume of moving object
If solid-state light sources are used to reduce size, then the device compactness is improved, but the light utilization efficiency and color conversion efficiency deteriorate
Solution Approach 1:
The patent changes the operational parameters of the solid-state light sources by controlling the intensity ratio between the first and second light sources. The controller adjusts these parameters dynamically based on different display scenarios, optimizing light utilization efficiency while maintaining the compact size advantage of solid-state sources.
Solution Approach 2:
The system utilizes color conversion by combining light from two different colored solid-state light sources. The first light source emits a first color and the second light source emits a second color, and their combined output achieves comprehensive color rendering while maintaining high efficiency and compact size.
3Loss of energy
If polarized light beams are used to improve light utilization efficiency, then the energy efficiency is improved, but the requirement for precise polarization control and additional optical elements increases device complexity
Solution Approach 1:
The controller periodically switches between different polarization states and intensity ratios of the light sources according to different display scenarios. This periodic control enables efficient use of polarized light while simplifying the optical structure by avoiding the need for complex continuous polarization control mechanisms.
4Manufacturing precision
If the illumination system is designed for high color accuracy, then the color rendering is improved, but the device complexity and production cost increase
Solution Approach 1:
The system achieves high color accuracy through dynamic control of the light source intensity ratios rather than through complex static optical filters or multiple precise optical elements. The controller dynamically adjusts the output of each light source based on the required color, simplifying manufacturing while maintaining color precision.
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 approach simplifies the structure of illumination systems and projection devices, reducing size and production costs while effectively utilizing polarized light beams through the time-sharing method, enhancing the efficiency of light utilization.
Implementation Method 1
a wavelength conversion element (140), the wavelength conversion element (140) converts the polarized light beam having the first polarized direction from the beam splitting element (130) to a converted light beam with a second color
Implementation Method 2
a wave plate (160)... the wave plate (160) is disposed on a transmission path of the polarized light beam having the second polarized direction and the reflected light beam
Data Source
AI summary
An illumination system, a projection device, and an illumination method are provided. The illumination system includes a polarized light source, a polarization switching element, a beam splitting element, a wavelength conversion element, a reflective element, and a wave plate. The polarized light source emits a polarized light beam with a first color. The polarization switching element switches a polarized direction of the polarized light beam at different time points. The beam splitting element separates polarized light beams having different polarized directions. The wavelength conversion element converts the polarized light beam having a first polarized direction to a converted light beam. The reflective element reflects the polarized light beam having a second polarized direction to form a reflected light beam. The beam splitting element combines the converted light beam and the reflected light beam comes from the wave plate disposed between the beam splitting element and the reflective element.