Grating-Based 3D Display Method for Multiple Pupil Views
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Solution Overview
Problem
Existing 3D display technologies based on grating systems suffer from the vergence-accommodation conflict (VAC) due to limited viewing zones, leading to visual fatigue, as they fail to provide multiple perspective views to each pupil effectively, resulting in a discrepancy between convergence and focusing distances.
Innovation Solution
The method involves generating small-interval viewing zones with intervals smaller than the pupil diameter, allowing each pupil to perceive multiple perspective views by adjusting the grating's inclination angle and position to ensure each pupil intersects with multiple viewing zones, thus overcoming the VAC by aligning light rays to natural focusing points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If one-dimensional grating is used with small inclination angle to generate viewing zones, then the viewing zones are aligned with the line connecting two pupils, but the number of viewing zones is limited and cannot cover both pupils effectively, resulting in only one viewing zone per pupil
Solution Approach 1:
The patent transitions from one-dimensional grating to two-dimensional grating structure. The 2D grating consists of multiple one-dimensional gratings arranged in different directions, creating a grid-like pattern that generates viewing zones in both horizontal and vertical dimensions. This dimensional expansion allows viewing zones to be distributed across a larger area, enabling effective coverage of both pupils with multiple viewing zones per pupil.
Solution Approach 2:
The 2D grating is segmented into multiple 1D grating units arranged in a matrix pattern. Each 1D grating segment contributes to generating viewing zones in its specific direction, and the combination of these segmented gratings creates a comprehensive viewing zone distribution that covers both pupils effectively.
2Device complexity
If limited number of viewing zones are used, then device complexity is reduced, but each pupil can only receive one perspective view, causing vergence-accommodation conflict and visual fatigue
Solution Approach 1:
By using 2D grating instead of 1D grating, the patent achieves multiple viewing zones per pupil without proportionally increasing overall system complexity. The 2D arrangement allows viewing zones to be distributed in both horizontal and vertical directions, enabling each pupil to access multiple perspective views while maintaining a compact and manageable grating structure.
Solution Approach 2:
The 2D grating structure serves multiple functions simultaneously: it generates viewing zones for both left and right pupils, provides multiple perspective views for each pupil, and maintains proper alignment with the line connecting the pupils. This multi-functionality allows the system to overcome VAC and reduce visual fatigue without requiring separate systems for each function.
3Ease of operation
If viewing zones are generated with interval larger than pupil diameter, then each pupil receives only one viewing zone for stereoscopic effect, but this causes vergence-accommodation conflict due to absence of monocular depth cue
Solution Approach 1:
The 2D grating arrangement creates viewing zones distributed in both horizontal and vertical dimensions, allowing multiple viewing zones to fall within the pupil diameter distance from each pupil. This enables each pupil to receive multiple perspective views simultaneously, providing both stereoscopic effect and monocular depth cues, thereby resolving the VAC problem.
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 reduces visual fatigue by allowing each eye to focus on natural spatial light spots, providing a more comfortable 3D visual experience with a moderate or reduced number of grating-generated viewing zones.
Implementation Method 1
adhere an one-dimensional grating to the flat display panel for directing light beams from M≥4 groups of pixels on the flat display panel to the corresponding M I-type viewing zones on the viewing-zone plane
Data Source
AI summary
The invention features techniques for presenting more than one perspective views to each eye of the viewer, through generating viewing zones with an interval smaller than the diameter of the viewer's pupil by display panel/grating pair/pairs. In the first method, the arraying direction of the small-interval viewing zones is designed having an appropriate small inclination angle to the line connecting the viewer's two pupils, so as to cover each eye with more than one viewing zones which are different with each other. In the extreme case, 4 small-interval viewing zones can implement 3D display with two views for each eye. This is absolutely different with existing grating-based 3D display, which aligns viewing zones along the direction with a small angle (<π/4) to the line connecting the viewer's two pupils and thus a rather large number of small-interval viewing zone is needed for covering the viewer's two eyes.