Curved Reflector Illumination System for Projector Luminance
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Solution Overview
Problem
Existing illumination systems for projectors using solid state light sources suffer from low efficiency and increased volume, weight, and manufacturing cost due to divergent light output and the need for reflecting mirrors, which limits the generation of green light and overall luminance.
Innovation Solution
The use of a curved reflecting component and wavelength converting components to concentrate light and improve luminance by converting a first wavelength light into a second wavelength light in a convergent manner, coupled with a light homogenizing component to uniformly emit light of different wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If reflecting mirrors are used to recycle blue light and generate green light through phosphor excitation, then green light can be produced, but the optical path becomes elongated and light utilization efficiency decreases
Solution Approach 1:
The patent employs a curved reflecting component with a specific focal length to converge blue light directly onto the phosphor layer. This curved geometry eliminates the need for multiple flat reflecting mirrors, shortening the optical path and reducing light loss while maintaining effective phosphor excitation.
Solution Approach 2:
The invention integrates the blue light source, curved reflecting component, phosphor layer, and green light output into a unified optical structure. This merging of components streamlines the optical path, eliminating separate recycling stages and reducing overall system complexity while improving light utilization efficiency.
2Reliability
If solid state light sources are used instead of high-pressure mercury lamps, then service life and environmental friendliness improve, but luminance output is insufficient
Solution Approach 1:
The patent converts blue light (short wavelength, high energy) into green light (longer wavelength, suitable luminance) through phosphor down-conversion. This wavelength transformation allows solid state blue LEDs to achieve the luminance characteristics traditionally requiring high-pressure mercury lamps, while retaining the reliability and longevity of solid state lighting.
Solution Approach 2:
The phosphor layer acts as an intermediary that converts blue light from the solid state source into green light with appropriate luminance. This mediator enables solid state light sources to achieve the required illumination intensity for projection applications while maintaining their inherent reliability advantages.
3Adaptability or versatility
If blue laser and phosphor powders are used to generate red, blue, green or yellow light, then color light can be produced, but the system volume and manufacturing cost increase
Solution Approach 1:
The patent extracts and eliminates unnecessary components from the conventional multi-color light generation system. By focusing on a simplified blue-to-green conversion pathway using a curved reflector and phosphor layer, it removes redundant optical elements while maintaining effective color light generation capability for projection.
Solution Approach 2:
The invention creates a simplified optical pathway that copies only the essential function needed for projection - converting blue light to green light through phosphor excitation. This selective copying of the critical light conversion function reduces system volume by eliminating other color generation pathways and associated components.
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 solution enhances light utilization efficiency, reduces system complexity, and improves luminance and image quality by concentrating light and eliminating the need for additional reflecting mirrors, making the system more competitive in the market.
Implementation Method 1
the curved reflecting component has a focal point, and the green phosphor layer is disposed at the focal point of the curved reflecting component
Implementation Method 2
the green phosphor layer is disposed at the focal point of the curved reflecting component for converting a first timing portion of blue light into green light
Data Source
AI summary
An illumination system for use in a projector is provided. The illumination system comprises a first light source, a first timing controlling unit, a curved reflecting component and a wavelength converting component. The first light source provides a first wavelength light, while the first timing controlling unit divides the first wavelength light into a first timing portion and a second timing portion. The curved reflecting component comprises a focal point. The wavelength converting component is disposed at the focal point for converting the first timing portion of the first wavelength light into a second wavelength light.