Projector Illumination Light Source System with Rotating Phosphor Wheel
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing illumination light source systems for projectors face challenges in preventing color mixing and phosphor deterioration while maintaining image brightness, particularly due to the constant irradiation of phosphors with excitation light, which leads to reduced fluorescent properties and decreased color purity.
Innovation Solution
An illumination light source system incorporating a reflection/transmission member with alternating transmission and reflection areas, where the excitation light path is switched between these areas during the rotation of a fluorescent wheel, reducing irradiation time and adjusting light volume when the boundary area crosses the emission path, thereby preventing color mixing and phosphor deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the excitation light source continuously irradiates the phosphor segment areas, then the projector achieves stable emission and high brightness, but the fluorescent property of the phosphor deteriorates due to constant irradiation
Solution Approach 1:
The patent applies periodic action by rotating the fluorescent wheel at a predetermined speed to periodically change the irradiation time of the phosphor segment areas. The excitation light source irradiates the phosphors in a periodic manner rather than continuously, allowing the phosphor to recover between irradiation cycles and preventing deterioration of fluorescent properties while maintaining stable emission and brightness.
Solution Approach 2:
The patent implements dynamics by rotating the fluorescent wheel at a controlled speed to dynamically adjust the irradiation time. This dynamic rotation ensures that each phosphor segment area receives excitation light only for a limited duration during each rotation cycle, preventing overheating and fluorescent property deterioration while maintaining overall system brightness through continuous rotation and periodic irradiation.
2Manufacturing precision
If the first light source is turned off in boundary areas to prevent color mixing, then color purity is improved, but the irradiation time to phosphor per unit time becomes unbalanced and fluorescent property deteriorates
Solution Approach 1:
The patent uses periodic action through the rotation of the fluorescent wheel to control the irradiation timing. By rotating the wheel at a predetermined speed, the system periodically irradiates different phosphor segment areas, ensuring that even areas near boundaries receive balanced irradiation over time. This periodic rotation prevents color mixing at boundaries while distributing the irradiation load evenly across all phosphor areas, preventing fluorescent property deterioration.
Solution Approach 2:
The dynamic rotation of the fluorescent wheel allows the system to dynamically control which phosphor areas are irradiated at any given moment. This dynamic approach ensures that boundary areas are irradiated only when properly positioned in the optical path, preventing color mixing, while the continuous rotation ensures all areas receive adequate irradiation over time, maintaining fluorescent properties.
3Manufacturing precision
If the excitation light source is turned off to prevent color mixing at boundaries, then color purity is maintained, but image brightness decreases
Solution Approach 1:
The patent applies periodic action by rotating the fluorescent wheel to bring different phosphor segment areas into the irradiation path in sequence. This periodic rotation allows the excitation light source to continuously irradiate phosphors without causing color mixing, as each area is irradiated only when properly positioned. The rapid rotation creates the perception of continuous illumination, maintaining image brightness while preventing color mixing through temporal separation of irradiation events.
Solution Approach 2:
The dynamic rotation of the fluorescent wheel enables the system to dynamically control the spatial-temporal distribution of excitation light. By rotating the wheel at an optimized speed, the system ensures that excitation light always illuminates phosphor areas that will not cause color mixing, while the continuous rotation maintains overall illumination levels and image brightness. This dynamic control allows simultaneous achievement of color purity and brightness.
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 effectively prevents color mixing and phosphor deterioration, enhancing color reproducibility and maintaining image brightness by dynamically controlling the light sources and rotation of the reflection/transmission wheel in synchronization with image data.
Implementation Method 1
a phosphor which generates a color different from that of the excitation light by excitation with the excitation light
Implementation Method 2
a reflection/transmission member having a transmission area which transmits excitation light from the excitation light source and a reflection area which reflects the excitation light
Data Source
AI summary
An illumination light source system includes an excitation light source; a reflection/transmission member having a transmission area which transmits excitation light from the excitation light source and a reflection area which reflects the excitation light, the transmission area and the reflection area sequentially crossing an emission light path of the excitation light source; a fluorescent member provided in at least one of a reflection light path of the excitation light reflected by the reflection area and a transmission light path of the excitation light transmitted through the transmission area, the fluorescent member being provided with a phosphor which generates a color different from that of the excitation light by excitation with the excitation light; and a controller which reduces a light volume of the excitation light source while a boundary area between the transmission area and the reflection area of the reflection/transmission member is located on the emission light path.