Selective-Aperture Array for 3D Display Pupil Division Multiplexing
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Solution Overview
Problem
Existing three-dimensional displays cause accommodation-convergence conflict due to the discrepancy between convergence and focusing distances, leading to visual fatigue, which hinders the popularization of the technology.
Innovation Solution
The system presents two or more perspective views to each eye through a selective-aperture array that allows light rays from different regions of the pupil to superimpose into real spatial light spots, aligning with the eye's natural focusing ability, using a combination of temporal and exclusive characteristics in the apertures and optical structures like lenses and guiding structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If stereoscopic technology projects only one perspective view to each eye, then the device complexity is reduced, but accommodation-convergence conflict occurs causing visual fatigue
Solution Approach 1:
The patent segments the single perspective view into multiple perspective views (at least two) that are presented to each eye through different regions of the pupil. This segmentation allows the light rays to converge at different depths while maintaining focus on the display plane, thereby resolving the accommodation-convergence conflict and reducing visual fatigue without significantly increasing device complexity
Solution Approach 2:
The patent introduces a new dimension of depth information by presenting multiple perspective views through the pupil division multiplexing technique. This allows the display system to encode depth cues in the angular distribution of light rays across the pupil, enabling the eyes to naturally focus and converge simultaneously at different depths without conflict
2Measurement precision
If the viewer focuses eyes on the display plane to observe perspective views clearly, then the image clarity is improved, but the convergence distance and focusing distance become inconsistent
Solution Approach 1:
The patent applies local quality by directing different perspective views to different local regions of the pupil. Each region of the pupil receives light rays from a specific perspective view, allowing the eye to focus locally on the display plane while the brain integrates these localized views to perceive depth, thus maintaining both image clarity and accommodation-convergence consistency
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 overcomes the accommodation-convergence conflict, reducing visual fatigue and enhancing the usability of three-dimensional displays by allowing the eye to focus naturally on overlapping light beams from multiple perspective views.
Implementation Method 1
Light rays from two or more perspective views perceived by one eye through different regions of the pupil superimpose into real spatial light spots
Implementation Method 2
division multiplexing of the viewer's entrance-pupil
Implementation Method 3
a projecting lens to project amplified virtual images of the at least one display screen
Implementation Method 4
a guiding structure to redirect propagating direction of the light beams from the at least one display screen
Implementation Method 5
a modulation element to adjust the exclusive characteristics of the light beams from the at least one display screen
Implementation Method 6
orthogonal polarization, wavelengths with great different transparency to different filters
Data Source
AI summary
The invention features techniques and systems for presenting two or more perspective views to each eye of the viewer, through division multiplexing of the viewer's entrance-pupil. The system is constituted by a selective-aperture array with each aperture being transparent only to light beams with some special characteristics, at least one display screen for optical information presentation, and other optional elements. The optical message on at least one display screen propagates to the selective-aperture array directly, or be directed to the selective-aperture array or the eye of the viewer by other optional elements. Through selective filtering by the apertures with temporal filtering characteristics or exclusive filtering characteristics, multiple perspective views get presented to an eye of the viewer through the selective-aperture array. Light rays different perspective views superimpose into real spatial light spots that the eye can focus on naturally, resulting in overcoming of the accommodation-convergence conflict.