Phosphor Switching Illumination System for Projection Lifespan
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Solution Overview
Problem
Current projection apparatuses using solid state light sources face limitations in lifespan and efficiency, particularly in the luminescence efficiency of LEDs and the need for high light output power, which affects the overall performance and longevity of the illumination system.
Innovation Solution
The proposed solution involves an illumination system with a coherent light source, a phosphor switching module, and a diffusion switching module, where the phosphor switching module includes light passing and phosphor reflecting sections that convert coherent light into color light beams, and the diffusion switching module processes these beams to produce an illumination light beam, thereby prolonging the lifespan and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a laser source is used to excite phosphor powder to produce pure color light source, then luminescence efficiency is improved (greater than 20%), but the lifespan of the illumination system deteriorates
Solution Approach 1:
The illumination system is divided into multiple functional modules: a blue light source module, a red phosphor converting module, a green phosphor converting module, and a light combining module. Each module performs a specific function, allowing independent optimization and maintenance, which resolves the contradiction between high efficiency and long lifespan by enabling selective replacement of individual components without replacing the entire system.
Solution Approach 2:
A light combining module is introduced as an intermediary component that combines blue light from the blue light source with red and green light from the phosphor converting modules. This intermediary structure allows the system to achieve high luminance efficiency while protecting individual components from direct exposure to high-power laser beams, thereby extending the overall system lifespan.
2Power
If multiple laser diodes are arranged in an array to produce high light output power, then luminance is improved, but device complexity increases
Solution Approach 1:
Multiple light beams from different sources (blue light source, red phosphor converting module, green phosphor converting module) are merged into a single combined light beam through the light combining module. This merging approach achieves high light output power while maintaining relatively simple individual components, resolving the contradiction between power and complexity.
Solution Approach 2:
The light combining module serves multiple functions: it combines light from different sources, adjusts the spectral composition, and controls the overall luminance output. This multi-functionality reduces the need for separate complex components for each function, thereby reducing overall device complexity while maintaining high light output power.
3Duration of action of stationary object
If conventional UHP lamp is used as light source, then lifespan is shorter, but luminance output is insufficient
Solution Approach 1:
The system changes the fundamental parameters of the light source by using a blue light source with specific wavelength characteristics and combining it with phosphor materials having specific emission spectra. This parameter change enables the system to achieve both high luminance output and extended lifespan, overcoming the limitations of conventional UHP lamps.
Solution Approach 2:
The system employs composite material structures, specifically phosphor particles with specific compositions (red phosphor and green phosphor) that are excited by blue light. These composite materials enable simultaneous achievement of high luminance and long lifespan by converting blue light into multiple wavelengths with high efficiency.
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 prolongs the lifespan of the light diffusion section, reduces the overall size of the optical system, and enhances color performance by increasing conversion efficiency, leading to improved luminance and color accuracy in projection apparatuses.
Implementation Method 1
The first phosphor reflecting section is capable of converting and reflecting the coherent light beam into a first color light beam
Implementation Method 2
The diffusion switching module includes a light diffusion section and a first light permeable section
Data Source
AI summary
An illumination system includes a coherent light source, a phosphor switching module, a beam combining unit and a diffusion switching module. The coherent light source emits a coherent light beam. The phosphor switching module includes a light passing section and a first phosphor reflecting section. The light passing section and first phosphor reflecting section are switched into a transmission path of the coherent light beam by turns. The first phosphor reflecting section converts and reflects the coherent light beam into a first color beam. The beam combining unit combines the coherent light beam passing through the light passing section and the first color light beam. The diffusion switching module includes a light diffusion section and a first light permeable section to be switched into the transmission paths of the coherent light beam and the first color light beam by turns. A projection apparatus is also disclosed.