Projection System Spatial Light Modulator Segmentation
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Solution Overview
Problem
Current single spatial light modulator projection systems using blue light + yellow light sources suffer from low light efficiency due to significant luminous flux loss during the process of decomposing yellow light into green and red components, resulting in high reflection losses and complex, costly structures.
Innovation Solution
A projection system with a light-splitting device that splits light into multiple primary color paths, allowing a single spatial light modulator to modulate multiple beams simultaneously, and an image processing device that synchronizes image signals with the light sequences, reducing light loss and improving energy utilization efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If yellow light is decomposed into green and red light using a filter wheel in a single spatial light modulator system, then color image formation is achieved, but luminous flux is lost by reflection and light efficiency becomes low
Solution Approach 1:
The patent divides the spatial light modulator into multiple regions (first region and second region) that can independently modulate different color components. The yellow light is split into green and red components that are directed to different regions, allowing simultaneous modulation without sequential filtering. This segmentation eliminates the need for a rotating filter wheel and prevents luminous flux loss by avoiding multiple reflection events.
Solution Approach 2:
The patent combines the modulation of green and red light components into a single spatial light modulator device operating simultaneously, rather than sequentially filtering them through a rotating wheel. The multiple regions of the SLM work in parallel to modulate different color components, merging the functions that were previously separated in time, thereby eliminating reflection losses and improving light efficiency.
2Measurement precision
If a filter wheel is used to decompose yellow light into green and red light, then color separation is achieved, but the structure becomes complex and manufacturing cost increases
Solution Approach 1:
The spatial light modulator is segmented into multiple functional regions, each responsible for modulating specific color components. This spatial segmentation replaces the temporal segmentation provided by a rotating filter wheel, achieving precise color separation through spatial distribution rather than mechanical rotation, thereby simplifying the overall system structure.
Solution Approach 2:
The patent extracts the color separation function from the mechanical filter wheel and integrates it directly into the spatial light modulator's optical path. By taking out the need for a rotating filter wheel and implementing color component separation through the SLM's multiple regions, the system achieves color separation precision while dramatically reducing structural complexity.
3Productivity
If yellow light is decomposed sequentially through a rotating wavelength conversion device and filter wheel, then color light is obtained, but light energy utilization efficiency becomes low
Solution Approach 1:
The patent implements continuous simultaneous modulation of green and red light components through multiple regions of the spatial light modulator, eliminating the intermittent sequential operation required by a rotating filter wheel. This continuous parallel processing maintains constant light energy utilization without the losses associated with mechanical rotation and sequential filtering.
Solution Approach 2:
The patent merges the sequential color separation and modulation operations into a single simultaneous process within the spatial light modulator. Multiple regions of the SLM work in parallel to modulate different color components at the same time, combining functions that were previously separated in time, thereby maximizing light energy utilization efficiency and eliminating losses from mechanical rotation and multiple reflections.
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
The system achieves higher light energy utilization efficiency by recovering reflected light and reducing structural complexity and costs, while maintaining effective color image formation.
Implementation Method 1
an excitation light source 101 emits excitation light to excite the rotating wavelength conversion device 102 to generate excited illumination light
Implementation Method 2
The filtered illumination light is homogenized by the light homogenizing device 105 and totally reflected at the TIR prism 107
Data Source
AI summary
A projection system, comprising: a light-emitting apparatus for providing first light and second light emitted in a time sequence; a light-splitting system for dividing the first light into first primary color light and second primary color light, and dividing the second light into two paths of third primary color light; a spatial light modulator, comprising a first region and a second region, wherein the primary color light emitted along a first optical path enters the first region, and the primary color light emitted along a second optical path enters the second region; and an image processing apparatus for dividing, corresponding to the first region and the second region, image signals to be output into two groups, and changing the sequence of at least one of the groups so as to match the time sequence of primary color light received in a corresponding region.