Dynamic Phosphor and Filter Wheel Lighting for Projectors
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Solution Overview
Problem
Existing lighting devices for projectors cannot dynamically adjust their luminous flux and spectral composition during operation, limiting their adaptability to different applications such as data projection and home cinema, which require specific color rendering and brightness settings.
Innovation Solution
A lighting device with a moveable phosphor arrangement and filter arrangement, synchronized by a phase control unit, allowing for dynamic adjustment of the phase relationship between the phosphor wheel and filter wheel to change the spectral composition and luminous flux of the light emitted, enabling real-time adaptation to different projection requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the phosphor wheel and filter wheel are fixed in their spectral properties, then the device structure is simple, but the adaptability to different projection applications is poor
Solution Approach 1:
The patent applies the dynamics principle by making the phosphor wheel and filter wheel rotatable rather than fixed. The phosphor wheel can rotate to present different phosphor segments (red, green, yellow) to the pump light source, and the filter wheel can rotate to present different filter segments (long-pass, short-pass, band-stop) to the conversion light. This dynamic configuration allows the lighting device to adapt its spectral properties for different projection applications such as data projection or home cinema, resolving the contradiction between adaptability and structural simplicity.
2Adaptability or versatility
If the phosphor wheel and filter wheel rotate synchronously with fixed phase relationship, then the control system is simple, but the ability to dynamically adjust spectral composition is limited
Solution Approach 1:
The patent applies the parameter changes principle by enabling dynamic adjustment of the phase relationship between the phosphor wheel and filter wheel. The phase control unit can modify the phase shift angle between the two wheels, allowing different segments of the phosphor wheel to overlap with different segments of the filter wheel during rotation. This enables dynamic control of the spectral composition of the emitted light, transforming fixed-parameter operation into variable-parameter operation to achieve adaptability for different applications.
3Illumination intensity
If specific phosphor and filter segments are used for home cinema applications, then color rendering is improved, but the device cannot be used for data projection with bright white background
Solution Approach 1:
The patent resolves this contradiction by making the system dynamic through rotation of the phosphor and filter wheels. For home cinema applications, the system can be configured with appropriate phase relationships to emphasize red and green phosphor segments with long-pass filters for brilliant colors. For data projection applications requiring bright white background, the system can be reconfigured to use different phase relationships that allow larger green and yellow phosphor segments with different filter combinations. This dynamic reconfigurability eliminates the need for application-specific hardware variants.
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
Enables dynamic control of brightness and color space representation, allowing the lighting device to adapt to various projection scenarios, improving the quality and quantity of color representation and brightness adjustments, which can be configured through user-operated menus.
Implementation Method 1
a phosphor arrangement for converting at least part of the pump light into conversion light
Implementation Method 2
a filter arrangement, for spectrally filtering the conversion light
Data Source
AI summary
A lighting device (1) comprising a pump light source, wherein the spectral composition of the useful light of the lighting device can be controlled by the control of the phase relationship between a rotating phosphor wheel and a filter wheel rotating synchronously therewith. The control of the phase relationship controls the temporal overlap of the conversion light coming from a phosphor element of the phosphor wheel with a filter element of the filter wheel, i.e. the extent of the spectral filtering of the conversion light by the filter element.