Multi-aperture Projection Display Static Imaging Depth of Field
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Solution Overview
Problem
Current multi-aperture projection systems struggle to effectively display different images at various projection distances or geometries without mechanical or image generator-side conversions, often resulting in reduced brightness and limited depth of field.
Innovation Solution
The system generates images at different projection distances by combining preliminary individual images for each projection channel using logical operations, such as AND or OR, to create final images where non-zero sections are darkened more at overlapping areas than at non-overlapping areas, allowing for static imaging without mechanical adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the pupil size is reduced to increase depth of field, then the depth of field is improved, but the brightness is reduced
Solution Approach 1:
The patent divides the single projection aperture into multiple sub-apertures (first, second, third sub-apertures) arranged in specific patterns. Each sub-aperture contributes to a portion of the projected image, and their combined effect creates an extended depth of field while maintaining overall brightness through the aggregation of multiple light paths.
Solution Approach 2:
The patent combines the light transmission from multiple sub-apertures to form a single projected image. The projection optical system integrates the light from all sub-apertures, merging their individual contributions to achieve both extended depth of field and maintained brightness through constructive superposition of light waves.
2Adaptability or versatility
If mechanical components or image sensor conversions are used to display different images at various projection distances, then the imaging flexibility is improved, but the device complexity increases
Solution Approach 1:
The patent uses a liquid crystal display (LCD) panel that can dynamically change its light modulation properties to generate different image patterns. By controlling the liquid crystal states, the system can adapt to project different images at various distances without mechanical movement, achieving dynamic adaptability through optical property changes rather than mechanical conversions.
Solution Approach 2:
The invention changes the optical parameters of the light modulation layer (liquid crystal orientation, phase delay, etc.) to achieve different imaging configurations. By adjusting the liquid crystal display parameters, the system can optimize image quality for different projection distances without adding mechanical components or sensors.
3Volume of moving object
If a regular two-dimensional arrangement of microprojectors is used, then the system compactness is improved, but the depth of field is limited
Solution Approach 1:
The patent transitions from a regular two-dimensional array of microprojectors to a three-dimensional arrangement of sub-apertures within a single projection optical path. The sub-apertures are positioned at different depths and lateral positions, creating a volumetric light distribution pattern that extends the depth of field while maintaining a compact physical footprint.
Solution Approach 2:
The invention nests multiple sub-apertures within a single projection optical system, effectively placing multiple functional elements inside one another. The first, second, and third sub-apertures are arranged in a nested or overlapping configuration within the projection optical path, allowing compact integration while achieving extended depth of field through their collective optical contribution.
Data Source
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AI summary
It is made possible to generate images to be projected at different projection distances with a multi-aperture projection display, statically or without any adjustment - neither mechanical nor image sensor-related - by appropriately designing the individual images of the multi-aperture projection display, namely by combining preliminary individual images for the projection channels of the multi-aperture projection display, which are provided for each of the at least two images to be projected, into the actual or final individual images, projection channel by projection channel.