Dual DMD Projection Device Dichroic Film Color Brightness
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Solution Overview
Problem
Current projectors face challenges in enhancing color reproducibility and brightness of projected images, which affects image quality.
Innovation Solution
The use of two digital micromirror devices (DMDs) in a non-sequential light-split manner, combined with a dichroic film, to split and process illumination light into different wavelength ranges, improving color brightness and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a single DMD is used to process illumination light, then the device complexity is low, but the color brightness and color reproducibility are insufficient
Solution Approach 1:
The illumination light is segmented into different wavelength ranges (e.g., blue, green, red) using a dichroic mirror, with each wavelength range being processed by a separate DMD. This segmentation allows each DMD to specialize in specific color wavelengths, thereby improving overall color brightness and reproducibility while distributing the processing load across multiple components.
Solution Approach 2:
Multiple DMDs are merged into a single optical system where their respective modulated light beams are combined and projected together. The first DMD processes blue and green wavelengths while the second DMD processes red wavelengths, and their outputs are merged to create a comprehensive full-color image with enhanced color brightness that neither DMD could achieve alone.
2Manufacturing precision
If multiple DMDs are used to improve color brightness, then the color reproducibility is improved, but the device complexity increases
Solution Approach 1:
The optical system is segmented into distinct wavelength processing channels, with each DMD assigned to specific wavelength ranges. This segmentation enables precise control over color reproduction for each wavelength band, improving overall color reproducibility while organizing system complexity into manageable, specialized modules.
Solution Approach 2:
A dichroic mirror serves as an intermediary component that separates incoming illumination light into different wavelength ranges and directs each range to the appropriate DMD. This intermediary enables precise wavelength routing and control, improving color reproducibility while simplifying the overall system architecture by providing a clear division of labor among components.
3Quantity of substance
If illumination light is split into multiple wavelength ranges, then the color light output is improved, but the loss of time in processing increases
Solution Approach 1:
The system employs periodic scanning of micromirrors in each DMD to sequentially modulate different wavelength ranges. By rapidly scanning mirrors back and forth in a periodic motion, the system processes multiple wavelength ranges in quick succession, creating the perception of simultaneous full-color output while minimizing processing time through efficient temporal multiplexing.
Solution Approach 2:
The micromirrors in each DMD maintain continuous scanning motion without interruption, ensuring that light modulation is ongoing throughout the projection process. This continuous action eliminates idle time between wavelength processing, maintains high color light output, and minimizes processing delays by keeping all components actively engaged in light modulation at all times.
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 effectively enhances color reproducibility and image quality by optimizing the combination of light in different wavelength ranges, resulting in improved color brightness and overall projection performance.
Implementation Method 1
a dichroic film configured to allow a first portion of the illumination light to transmit therethrough to form a light in a first wavelength range and to reflect a second portion of the illumination light into a light in a second wavelength range
Implementation Method 2
a first digital micromirror device (DMD) configured to reflect the light in the first wavelength range from the dichroic film into a first light, and a second DMD configured to reflect the light in the second wavelength range from the dichroic film into a second light
Data Source
AI summary
A projection device for providing an image light includes a light source module configured to provide an illumination light, a dichroic film configured to allow a first portion of the illumination light to transmit therethrough to form a light in a first wavelength range and to reflect a second portion of the illumination light into a light in a second wavelength range different from the first wavelength range, a first digital micromirror device (DMD) configured to reflect the light in the first wavelength range from the dichroic film into a first light, and a second DMD configured to reflect the light in the second wavelength range from the dichroic film into a second light, wherein the first light and the second light together form the image light.