Projection System Light Deflection for Diffraction Reduction
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Solution Overview
Problem
The miniaturization of micromirror units in projection systems leads to optical issues such as light diffraction, which affects the resolution and quality of the projected image.
Innovation Solution
A projection system that includes a light modulation device with micromirror units, each divided into sections corresponding to pixels, and a light deflecting device that shifts illumination sub-beams between these sections in a time division manner to minimize diffraction, ensuring each section modulates the light independently and accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the micromirror unit size is reduced to improve resolution, then the resolution is improved, but light diffraction increases
Solution Approach 1:
The micromirror unit is divided into multiple sections, with each section corresponding to a specific pixel or group of pixels. This segmentation allows independent control of light modulation for each section, enabling high-resolution display while maintaining larger physical micromirror unit sizes to reduce diffraction effects
Solution Approach 2:
The system uses a light deflecting device to dynamically shift illumination sub-beams between different sections of the micromirror unit in a time-division manner. This dynamic beam shifting allows each micromirror unit to serve multiple pixel positions sequentially, achieving high resolution without requiring proportionally smaller mirror sizes that would increase diffraction
2Area of stationary object
If the micromirror unit size is reduced to reduce chip size, then the chip size is reduced, but light diffraction increases
Solution Approach 1:
Each micromirror unit is designed to handle multiple pixel positions through the light deflecting device's beam shifting capability. A single micromirror unit can modulate light for multiple sections corresponding to different pixels, making the micromirror unit multi-functional and reducing the total number of micromirror units needed, thereby reducing chip size without decreasing individual mirror dimensions
Solution Approach 2:
The system introduces the time dimension through time-division multiplexing, where a single micromirror unit serves multiple spatial positions at different time intervals. The light deflecting device shifts illumination sub-beams between sections, allowing one micromirror unit to effectively replace multiple smaller units, reducing chip area while maintaining resolution and avoiding diffraction from miniaturized mirrors
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 approach enhances image resolution and reduces light diffraction, enabling high-quality projections without the need for larger micromirror units, while maintaining efficient modulation and alignment of illumination sub-beams.
Implementation Method 1
a light deflecting device configured to shift the one or more illumination sub-beams from one section of the plurality of sections to another section of the plurality of sections
Data Source
AI summary
A projection system, comprising a light modulation device, a light source system and a light offset device. The light source system is used for emitting one or more illumination sub-beams. The light modulation device is used for modulating illumination light according to image data to form image light, the image light being used for displaying an image corresponding to the image data. The light offset device is used for transferring one illumination sub-beam to each zone of a micro-mirror unit by means of a time sequence such that the micro-mirror unit modulates the illumination sub-beam by means of a time sequence to form image light of a pixel corresponding to each zone, wherein each zone corresponds to one pixel of an image.