Projection Illumination System with Sequential Light Filtering
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Solution Overview
Problem
Conventional illumination systems for projection devices have complex structures and are not suitable for reflection-type phosphor wheels, leading to impaired wavelength conversion efficiency and compromised image quality due to the inability to effectively use color filters and phosphor agents collaboratively.
Innovation Solution
The proposed illumination system simplifies the structure by arranging a wavelength conversion element and a sequential light-filtering device in separate optical paths, using ordinary optical elements to enhance light conversion efficiency and filtering performance, thereby improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional illumination system with phosphor wheel and color filters is used, then color light production is achieved, but structure becomes complicated and wavelength conversion efficiency is impaired
Solution Approach 1:
The illumination system is segmented into distinct functional modules: a light source unit, a wavelength conversion unit with phosphor agents, and a color filtering unit with color filters. Each module operates independently and can be optimized separately, reducing overall system complexity while maintaining high wavelength conversion efficiency through proper spatial arrangement and optical path design.
2Manufacturing precision
If color filters and phosphor agents are used collaboratively, then color light filtering is achieved, but filtering performance deteriorates due to scattered light
Solution Approach 1:
An intermediary optical system is introduced between the phosphor agents and color filters. This intermediary includes optical elements that collect and redirect scattered light from the phosphor agents at controlled angles, ensuring it reaches the color filters at appropriate incident angles for effective filtering, thereby improving both filtering performance and wavelength conversion efficiency.
Solution Approach 2:
The system optimizes the angular parameters of light propagation by using optical elements to control the direction of light from phosphor agents to color filters. By adjusting incident angles and optical path lengths, the system achieves optimal filtering performance while maintaining high wavelength conversion efficiency.
3Reliability
If conventional illumination system is used, then color light production is achieved, but image quality is adversely affected
Solution Approach 1:
The illumination system merges the functions of wavelength conversion and color filtering into a unified optical path. The phosphor agents and color filters are positioned to work together seamlessly, with optical elements ensuring proper light coupling. This integrated design improves image quality by eliminating the need for separate complex subsystems while maintaining reliable color light production.
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 configuration reduces the overall volume of the projection device, enhances filtering performance, and improves image quality by allowing for efficient conversion and filtering of light waves, enabling better color light production and projection.
Implementation Method 1
a wavelength conversion element, a sequential light-filtering device, and a light guiding device. The wavelength conversion element is used for converting the first waveband light into a second waveband light
Implementation Method 2
The sequential light-filtering device is used for sequentially filtering the first waveband light and the second waveband light along a third optical path
Implementation Method 3
a light guiding device. The light guiding device is arranged in and connected to the first optical path, the second optical path and the third optical path for guiding the first waveband light and the second waveband light
Data Source
AI summary
An illumination system for a projection device is provided. The projection device emits a first waveband light along a first optical path. The illumination system includes a wavelength conversion element, a sequential light-filtering device, and a light guiding device. The wavelength conversion element converts the first waveband light into a second waveband light along a second optical path. The sequential light-filtering device sequentially filters the first waveband light and the second waveband light along a third optical path. The light guiding device guides the first waveband light and the second waveband light along a third optical path or guides the first waveband light to the wavelength conversion element. Consequently, the first waveband light and a first light beam and a second light beam of the second waveband light are sequentially filtered by the sequential light-filtering device and projected out.