Cross-Shaped Reflector Illumination System for Projection Brightness
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Solution Overview
Problem
Current illumination systems in projection apparatuses face issues with light efficiency and brightness uniformity due to asymmetrical and large flare distributions when using multiple laser light sources, leading to poor performance.
Innovation Solution
The use of a cross-shaped arrangement of reflectors in the illumination system, where multiple light-emitting units and reflectors are positioned to concentrate and symmetrize the flare distribution, improving light efficiency and uniformity by reducing flare spread and enhancing image brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple laser light sources are adopted to improve brightness, then the brightness of the image is improved, but the flare distribution becomes large and asymmetrical, affecting brightness uniformity and light efficiency
Solution Approach 1:
The patent applies asymmetry principle by using reflectors with specific asymmetric shapes and orientations to control and symmetrize the flare distribution. The reflectors are designed with particular geometric configurations that transform the asymmetric flare patterns into symmetric distributions, thereby improving brightness uniformity while maintaining high brightness output from multiple laser light sources
2Illumination intensity
If multiple laser light sources are adopted to improve brightness, then the brightness of the image is improved, but the flare distribution range becomes large, leading to poor light efficiency
Solution Approach 1:
The patent applies dimensionality change by introducing reflectors that operate in multiple spatial dimensions to control flare distribution. The reflectors are positioned and oriented in three-dimensional space to redirect flares along specific paths, concentrating them into a smaller distribution range and improving light efficiency while maintaining the brightness enhancement from multiple laser sources
3Manufacturing precision
If four groups of laser light sources are adopted, then the flare distribution becomes symmetrical but large, with no light near the optical axis, resulting in poor light efficiency
Solution Approach 1:
The patent applies local quality principle by using reflectors with position-specific geometric characteristics to differentially control flare distribution in different spatial regions. Each reflector is designed with specific shape and orientation to concentrate flares in particular areas, ensuring uniform illumination across the optical axis while improving overall light efficiency through localized flare management
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 effectively enhances light efficiency and brightness uniformity by concentrating flares and reducing their distribution range, resulting in improved image quality and a more compact system design.
Implementation Method 1
the first reflector is configured to reflect the first light beam toward a first direction. The second reflector is configured to reflect the second light beam toward the first direction
Data Source
AI summary
An illumination system including a first light-emitting unit, a first reflector, a second light-emitting unit, and a second reflector is provided. The first light-emitting unit is configured to emit a first light beam, and the first reflector is configured to reflect the first light beam toward a first direction. The second light-emitting unit is configured to emit a second light beam, and the second reflector is configured to reflect the second light beam toward the first direction. The first reflector and the second reflector are arranged in a second direction. For a view seeing along the second direction, the first reflector and the second reflector form a cross shape. The second direction is perpendicular to the first direction. A projection apparatus is also provided.