Deflection Aperture Array for VAC-Free 3D Display Viewing
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Solution Overview
Problem
Existing VR/AR systems suffer from vergence-accommodation conflict (VAC) due to inconsistent focusing depth and converging depth, causing visual discomfort, particularly in near-eye displays, which hinders the widespread adoption of three-dimensional displays.
Innovation Solution
A display module with a multi-view display structure and a deflection aperture array that constrains the divergence angle of outgoing beams, using light-splitting devices and deflection apertures to guide light to the eye with small divergence angles, ensuring at least one beam reaches the pupil, and employing orthogonal characteristics to suppress noise and enhance the field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional stereoscopic technology is used to project two-dimensional images to each eye, then the depth perception is triggered by spatial intersection of visual directions, but the focusing depth and converging depth become inconsistent causing vergence accommodation conflict (VAC)
Solution Approach 1:
The patent divides the single viewing path into multiple segmented paths by introducing multiple deflection apertures (first deflection aperture and second deflection aperture) that guide light from different pixel groups to different regions of the pupil. This segmentation allows multiple views to reach the same eye through different optical paths, enabling the eye to focus at the display screen while perceiving three-dimensional depth, thereby resolving the VAC problem.
Solution Approach 2:
The patent introduces a light-splitting device as an intermediary component between the display screen and the viewer's eye. This device includes multiple pixel groups and deflection apertures that act as mediators to redirect light beams along different paths. The intermediary structure enables the eye to receive multiple views simultaneously without changing the focusing plane, thus eliminating the conflict between convergence and accommodation.
2Measurement precision
If small-size apertures are used as observing windows to reduce beam divergence angle, then the light intensity gradient along depth direction is reduced, but the field of view becomes limited
Solution Approach 1:
The patent extends the solution from a single aperture to multiple apertures arranged in different spatial positions. By adding the first deflection aperture and second deflection aperture at different locations and orientations, the system captures light beams from different angular directions and guides them to different pupil regions. This dimensional expansion allows the field of view to be enlarged while each individual aperture maintains its small size for precise beam control.
Solution Approach 2:
The patent segments the field of view collection into multiple parts, with each deflection aperture responsible for capturing and directing light from specific angular ranges. The first pixel group and second pixel group are associated with different deflection apertures, and each aperture guides light to different regions of the pupil. This segmentation allows the system to maintain small aperture sizes for precise beam control while collectively achieving a large field of view through the combined effect of multiple apertures.
3Area of moving object
If multiple deflection apertures are used to enlarge the field of view, then more viewing zones are covered, but the device complexity increases
Solution Approach 1:
The patent merges the functions of multiple pixel groups and multiple deflection apertures into a unified optical system. The first pixel group and second pixel group are integrated with the first deflection aperture and second deflection aperture respectively, forming a cohesive multi-view display structure. This merging approach allows the system to achieve an enlarged field of view while maintaining a relatively compact and integrated device design, reducing the complexity that would arise from separate independent 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
The solution provides a VAC-free three-dimensional display with a large depth of field and reduced noise, enhancing the viewing experience by ensuring consistent focus and minimizing visual discomfort.
Implementation Method 1
a light-splitting device guides light beams from different pixel or subpixel groups on the display screen to corresponding viewing zones
Implementation Method 2
each deflection aperture guides the projected light beams from the corresponding pixel or subpixel group to transmit to the observing zone for the eye through deflecting an incident light beam
Data Source
AI summary
The invention discloses a display module with the divergence angle of an outgoing beam constrained again by the corresponding deflection aperture, which includes a multi-view display structure, a deflection-aperture array and a control device. The multi-view display structure includes a display screen, a light-splitting device, and a backlight-source assembly for providing backlights when a backlit-type display screen is adopted. The light-splitting device guides light beams from each group of pixels or sub-pixels to the corresponding viewing zone. A deflection aperture with a small size is designed for constraining the divergence angle of deflected light beams. Multiple deflection apertures play the function of enlarging the field of view, which is very limited when only a single deflection aperture exists. With orthogonal characteristics being assigned to deflection apertures for suppressing noise and/or for projecting more views, three-dimensional display with natural focus will get implemented with large field of view and low noises.