Dual Projector Stereoscopic Projection with Quasi-Interlace
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Solution Overview
Problem
Stereoscopic motion picture projection systems often cause viewer discomfort due to binocular asymmetries in illumination, temporal, and geometrical symmetries, leading to eyestrain and other unpleasant sensations, as existing designs fail to maintain consistent left and right image matching.
Innovation Solution
A dual projector system with synchronized push-pull modulators and quasi-interlace techniques ensures simultaneous and balanced projection of left and right images, addressing illumination and temporal asymmetries, and enhancing image resolution through field-for-field synchronization and quasi-interlace deconstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional single projector stereoscopic projection is used, then device complexity is reduced, but binocular symmetry (illumination and temporal) deteriorates causing viewer discomfort
Solution Approach 1:
The patent divides the projection system into two separate projectors, each dedicated to projecting one eye's image (left and right). This segmentation allows independent control of each projector's illumination and timing, enabling precise binocular symmetry adjustment that eliminates viewer discomfort while maintaining manageable system complexity through modular design.
Solution Approach 2:
The patent introduces a synchronization system as an intermediary between the two projectors, coordinating their operation to ensure temporal symmetry. This mediator component manages the complex timing relationships and illumination balancing without requiring direct complex integration between projectors, thus improving binocular symmetry while keeping device complexity manageable.
2Reliability
If field sequential projection is used, then temporal symmetry is improved, but image brightness deteriorates due to sequential rather than simultaneous projection
Solution Approach 1:
The patent employs periodic action by rapidly alternating between left and right image projection in a synchronized field-sequential manner. Both projectors operate continuously at high frequency, ensuring temporal symmetry through regular periodic switching while maintaining high brightness because neither projector needs to project both images sequentially, eliminating the brightness penalty of traditional field-sequential systems.
Solution Approach 2:
The patent merges the output of two separately projected stereoscopic images into a single combined stereoscopic display. By combining two simultaneous projection streams with proper synchronization and polarization, the system achieves both temporal symmetry and high brightness, as each projector contributes fully illuminated frames rather than sharing a single projector's duty cycle.
3Reliability
If two projectors are used for stereoscopic projection, then binocular symmetry is improved, but device complexity increases
Solution Approach 1:
The patent segments the projection system into two independent projector units, each handling one eye's image. This modular segmentation improves binocular symmetry through independent control while managing complexity by keeping each projector unit standardized and interchangeable, reducing the burden of integrating highly customized components.
Solution Approach 2:
The patent implements feedback mechanisms through synchronization systems that monitor and adjust the operation of both projectors. This feedback control ensures binocular symmetry by continuously coordinating timing and illumination levels, while the automated nature of the feedback reduces operational complexity compared to manual calibration systems.
4Device complexity
If traditional stereoscopic projection without quasi-interlace is used, then device complexity is reduced, but image resolution deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-processing the image data into a quasi-interlace format before projection. This preliminary deconstruction and organization of image fields enables higher effective resolution during projection without requiring complex real-time processing during operation, thus improving image resolution while keeping device complexity manageable through offline preparation.
Solution Approach 2:
The patent employs dynamic field-for-field synchronization where the projection system adaptively alternates between different field sequences. This dynamic approach optimizes image resolution by properly timing the projection of interlaced fields from both projectors, achieving high precision image reconstruction without requiring static complex processing hardware.
Data Source
AI summary
A system and method for projecting stereoscopic images using a multiple projector arrangement is provided. The design comprises transmitting a first field train from the first projector, the first field train comprising first projector left and right images and concurrently transmitting a second field train from the second projector, the second field train comprising second projector left and right images. The first projector left image is transmitted by the first projector at substantially a same time as the second projector right image is transmitted by the second projector. Alternately, the design comprises transmitting a first field train from the first projector, the first field train comprising first projector left images alternating with first projector right images, and concurrently transmitting a second field train from the second projector, the second field train comprising second projector left images alternating with second projector right images. A quasi-interlacing technique is also provided.