Stereoscopic Projection System Using Lens Arrays and Polarizing Filters
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Solution Overview
Problem
Existing stereoscopic image reproduction systems require discriminating filters, such as glasses, for observers, which are inconvenient and costly, especially for those who already wear glasses.
Innovation Solution
A system comprising a projection screen, projectors, and three optical devices: a matrix of converging lenses and a matrix of discriminating elements with superimposed filters, allowing stereoscopic image reproduction without the need for polarized or colored glasses by positioning the optical devices to focus images directly on the observers' eyes without intermediate filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If discriminating filters (glasses) are used in front of each observer's eye, then stereoscopic image reproduction is achieved, but convenience and comfort for observers deteriorate
Solution Approach 1:
The discriminating filters are extracted from the observer side and relocated to the projection system side. The patent implements this by integrating polarizing filters into the projector optics, specifically placing them in the condenser lens system or aperture stop region, thereby eliminating the need for separate polarized glasses for each observer.
Solution Approach 2:
The projection system itself becomes the intermediary that provides the stereoscopic discrimination function. Instead of requiring each observer to have their own filtering mechanism, the projection system acts as a shared intermediary that encodes stereoscopic information directly into the projected image through integrated polarizing elements.
2Reliability
If discriminating filters (glasses) are provided for each observer, then stereoscopic image reproduction is achieved, but cost increases due to production, transportation and cleaning
Solution Approach 1:
The discriminating filter function is merged with the existing projection system components. The patent integrates polarizing filters into the projector's optical path, combining multiple functions (image projection and stereoscopic discrimination) into a single unified system, thereby eliminating the need for separate disposable or maintainable filter components for each user.
Solution Approach 2:
The projection system is enhanced to perform multiple functions simultaneously: it projects the image and provides stereoscopic discrimination for all observers at once. The integrated polarizing filters in the projection system serve as a universal solution for all observers, replacing the need for individual observer-specific filtering devices.
3Reliability
If conventional diffusing screen is used with time-division multiplexed images, then stereoscopic reproduction is achieved, but active discriminating filters (shutter glasses) are still required
Solution Approach 1:
The active discrimination function is extracted from the observer's shutter glasses and transferred to the projection system. The patent implements passive polarizing filters within the projector optics that continuously provide stereoscopic separation without requiring synchronized active switching or complex electronic control mechanisms.
Solution Approach 2:
The patent eliminates the need for periodic switching actions required by active shutter systems. Instead, it employs continuous passive polarizing filtration that operates without temporal modulation, removing the synchronization requirements and periodic mechanical or electronic switching components.
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
Enables comfortable and cost-effective stereoscopic image viewing without the need for additional glasses, improving eye hygiene and adaptability for various viewing environments.
Implementation Method 1
The first optical device is configured as a matrix of converging lenses, identical to one another, having a focal distance f1 and arranged on a plane. The lenses of the first optical device have a depth of field of focus suitable for containing the optical center of the objective lens of the projector and the places intended for observing the images.
Implementation Method 2
The second optical device is configured as a matrix of converging lenses, identical to one another, having a focal distance f2 equal to half the focal distance f1 of the converging lenses of the first optical device. The second optical device is located between the first optical device and the projection screen, equidistant from and parallel to both, in the focal plane of the first optical device
Implementation Method 3
The third optical device is configured as a matrix of discriminating elements, wherein each discriminating element includes a first discriminating filter configured for selecting a first stereoscopic pair image and a second discriminating filter configured for selecting the second stereoscopic pair image
Data Source
AI summary
The present invention relates to a system for reproducing stereoscopic images comprising a projection screen, a projector, a first optical device, comprising a matrix of converging lenses having a focal distance f1, located in front of the projection screen, at a distance equal to twice the focal distance, a second optical device located in the focal plane of the first optical device and comprising a matrix of converging lenses, having a focal distance f2 equal to half the focal distance f1, located between the first optical device and the projection screen, and a third optical device located between the second optical device and the projection screen, in contact with the second optical device, the third optical device comprising a matrix of discriminating elements.