3D Projection Light Recycling via Spectral Filter Wheel
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Solution Overview
Problem
Current 3D projection technologies face challenges in achieving high brightness and efficiency, particularly in multi-channel image displays like 3D cinema and medical diagnostics, due to limitations in light recycling and color separation methods such as Anaglyph, Linear Polarization, Circular Polarization, Shutter Glasses, and Spectral Separation, which often require expensive equipment and result in color distortion or reduced color gamut.
Innovation Solution
A projection system with a light modulator that simultaneously modulates left and right channel images using a filter wheel with spectrally separated filters, allowing for the recycling of unused light spectrum by redirecting it to the other channel, and employing a concentric track or spirally shaped filter design to optimize light usage and reduce material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If spectral separation filters are used to separate left and right eye images, then color accuracy is improved, but light loss increases due to filtering
Solution Approach 1:
The patent recovers unused spectral light by redirecting it through a mirror to the other eye's channel. Instead of discarding the blocked spectrum from each filter, the system captures and reuses it, thereby reducing overall light loss while maintaining color accuracy through the filter-based separation method
Solution Approach 2:
The patent converts the harmful effect of light blocking by filters into a beneficial recycling mechanism. The light that would normally be wasted is redirected and reused for the complementary channel, transforming energy loss into useful illumination
2Measurement precision
If conventional filter wheels are used for spectral separation, then color separation is achieved, but material costs and device complexity increase
Solution Approach 1:
The filter wheel is divided into distinct filter sections, each with specific spectral characteristics for left and right eye separation. This segmentation allows precise color separation while enabling the recycling mechanism to redirect specific spectral portions to the appropriate channel
Solution Approach 2:
The filter wheel serves multiple functions: it performs spectral separation for 3D image channels and simultaneously enables light recycling by directing unused spectra to the complementary channel, reducing the need for additional separate components
3Quantity of substance
If spectral separation is used for full-color 3D projection, then color gamut is maintained, but brightness decreases due to light filtering
Solution Approach 1:
The patent recovers spectral light that would otherwise be discarded by the filters, redirecting it to the other eye's channel. This increases the total light available for projection while maintaining the full-color capability provided by spectral separation
Solution Approach 2:
The system converts the brightness-reducing effect of spectral filtering into a benefit by recycling the blocked light spectra. The light blocked for one channel becomes useful illumination for the other channel, increasing overall brightness while preserving color gamut
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 solution enhances brightness and efficiency in 3D projections by effectively recycling light and maintaining color accuracy, reducing the need for expensive components and minimizing color distortion, while allowing for full-color image display with improved light utilization.
Implementation Method 1
A projection system with a light modulator that simultaneously modulates left and right channel images using a filter wheel with spectrally separated filters
Implementation Method 2
allowing for the recycling of unused light spectrum by redirecting it to the other channel
Data Source
AI summary
A light modulator configured to modulate at least two channels of an image to be projected and a lighting system configured to illuminate portions of the modulator corresponding to each channel with light having properties consistent with the channel. The channels comprise, for example, left and right channels of a 3D projection (e.g., a digital cinema projection). In one embodiment, the channels are provided by a multi-sectored filter wheel having at least one filter section for a first channel and at least one filter section for a second channel, where boundaries between the sectors are different in each section.