Projection Illumination System Wavelength Separation Coating
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Solution Overview
Problem
Laser projectors waste light energy due to yellow light generated by phosphors not being effectively utilized, leading to decreased optical efficiency.
Innovation Solution
Incorporating a light separating element with a first coating region and a reflective element with a second coating region in the illumination system, where the laser beam penetrates the first coating region to reach a wavelength conversion element, and the converted beam is reflected by both coating regions to form an illumination beam, preventing the converted beam from returning to the light separating element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a blue light from the light source system passes through holes of a reflective cover to be converged onto a phosphor wheel, then the phosphors are excited to generate yellow light, but the yellow light leaves the optical system through the holes of the reflective cover and is wasted, decreasing optical efficiency
Solution Approach 1:
A light separating element is introduced as an intermediary component between the phosphor wheel and the reflective cover. This element selectively separates blue light (allowing it to pass through) from yellow light (reflecting it back), preventing the yellow light from being wasted while maintaining the excitation function of the phosphor wheel.
Solution Approach 2:
The light separating element utilizes wavelength-selective properties to differentiate between blue and yellow light based on their color characteristics. The element is designed to transmit blue light while reflecting yellow light, enabling selective optical management of different wavelengths.
2Reliability
If the yellow light generated by exciting phosphors leaves the optical system through holes of the reflective cover, then the imaging function is maintained, but a portion of light energy is wasted, decreasing optical efficiency
Solution Approach 1:
The light separating element serves as a mediator that allows the optical system to maintain its imaging function while preventing energy waste. It selectively transmits blue light for imaging purposes while reflecting yellow light back into the optical path for reuse.
Solution Approach 2:
Instead of discarding the yellow light generated by the phosphor wheel, the light separating element recovers it by reflecting it back into the optical system where it can be reused for further excitation or imaging, thereby recovering wasted energy.
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 enhances light utilization efficiency and imaging quality by ensuring the converted beam is effectively used, resulting in improved optical efficiency and imaging effects in the projection apparatus.
Implementation Method 1
The wavelength conversion element is located on a transmission path of the at least one laser beam from the at least one light separating element, and adapted to convert a portion of the at least one laser beam into a converted beam
Implementation Method 2
The reflective element is disposed between the at least one laser light source and the wavelength conversion element, and has a reflective surface facing the wavelength conversion element. The reflective surface has a second coating region, and the second coating region is adapted to reflect the portion of the at least one laser beam from the wavelength conversion element
Data Source
AI summary
The invention provides a projection apparatus and an illumination system. The projection apparatus includes an illumination system, a light valve, and a projection lens. The illumination system includes at least one laser light source, at least one light separating element, a wavelength conversion element, and a reflective element. The at least one laser light source is adapted to generate at least one laser beam, and the at least one laser beam is adapted to penetrate at least one first coating region of the light separating element. The wavelength conversion element is adapted to convert the laser beam from the light separating element into a converted beam. A second coating region of a reflective surface of the reflective element is adapted to reflect a portion of the laser beam from the wavelength conversion element, and the second coating region and the first coating region are adapted to reflect the converted beam. The portion of the laser beam and the converted beam constitute an illumination beam. In the projection apparatus and the illumination system of the invention, the converted beam may be more effectively used, so that the illumination system has good optical efficiency, and the projection apparatus has good imaging effects.