3D Display Light Deflection for Eye Strain Reduction
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Solution Overview
Problem
Current 3D display technologies face challenges such as limited resolution, field of view, and eye strain due to the mix-up between depth sensation and eye accommodation, with existing methods like stereoscopic, volumetric, and light field displays being cumbersome or complex, and lacking in high angular resolution and multi-camera arrays.
Innovation Solution
A device using an adjustable light deflecting system that increases the effective number of pixels by deflecting light beams multiple times within the human visual system's integration period, allowing for high-resolution 3D image perception with a large field of view without the need for a multi-camera array, utilizing a microlens array and adjustable light deflecting devices like tunable microprisms or liquid crystal systems to change the deflection angle and intensity of light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If stereoscopic methods are used to present two offset images separately to left and right eyes, then 3D depth perception is achieved, but the 3D image information is limited to a single plane of display causing eye strain and fatigue
Solution Approach 1:
The patent transitions from 2D planar display to 3D volumetric display by introducing a temporal dimension through sequential projection of multiple 2D images at different depths. The light deflecting device dynamically redirects light beams to create the perception of depth without requiring physical 3D space, thereby resolving the contradiction between depth perception and eye strain.
Solution Approach 2:
The system employs periodic projection of multiple 2D images representing different depth layers in rapid succession, utilizing the persistence of vision to create a stable 3D perception. This temporal multiplexing allows the display to present multi-depth information without requiring the eyes to constantly refocus, eliminating eye strain while maintaining accurate depth sensation.
2Measurement precision
If volumetric displays are used to display points of light within a 3D space, then a real 3D image is formed, but the displays have low resolution and large physical size
Solution Approach 1:
The patent creates a virtual 3D light field by projecting multiple 2D images that copy and reconstruct the optical properties of a real 3D scene. Instead of physically displaying light points in 3D space, the system uses computational algorithms to generate 2D projections that, when sequentially displayed with light deflection, create the perception of a high-resolution 3D image without requiring large physical volumes.
Solution Approach 2:
The system changes the temporal parameters of light projection by displaying multiple 2D images at different time instances, each representing a different depth plane. The light deflecting device dynamically adjusts deflection angles to map these temporal sequences to spatial depth perception, achieving high resolution without increasing physical display size.
3Measurement precision
If light field displays use layered LCD panels and compression algorithms, then eye convergence and focus angles are controlled simultaneously, but the field of view and angular resolution are limited
Solution Approach 1:
The patent introduces dynamic light deflection using adjustable light deflecting devices that can change deflection angles in real-time. This dynamic capability allows the system to expand the field of view by directing light beams to different angular positions sequentially, and enhances angular resolution by precisely controlling the deflection angles for each projected image layer, overcoming the limitations of static layered LCD panels.
4Measurement precision
If a light field camera uses an array of micro-lenses with high resolution sensors, then directional information is sensed with high angular resolution, but the system requires many sensors with high fill factor which limits performance
Solution Approach 1:
The patent extracts the light field information capture function from complex multi-camera arrays and micro-lens sensor systems, achieving the same goal through a simpler 2D display with sequential projection. By using temporal multiplexing and light deflection, the system obtains angular and depth information without requiring complex optical hardware or high-fill-factor sensor arrays, thereby reducing device complexity while maintaining measurement precision.
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 high-resolution 3D image with a large field of view, reducing eye strain and fatigue by effectively increasing the number of perceived pixels, maintaining accurate depth sensation and eye accommodation, and functioning regardless of viewer position or number.
Implementation Method 1
An array of optical elements is structured to refract and configure into multiple parallel light beams, in a plurality of angles, light emitted from each member of a subarray of neighboring pixels
Implementation Method 2
An array of a plurality of adjustable light deflecting devices is mounted in front of the pixels. Each of the plurality of adjustable light deflecting devices is structured to deflect the light emitted by the pixels
Data Source
AI summary
A device for time-based multiplexing of a projection of a three-dimensional FIG. 1 image to increase its resolution includes a two-dimensional display comprising an array of pixels. An array of optical elements is placed in front of the pixels. The optical elements are structured to refract and configure into multiple parallel light beams, in a plurality of angles, light emitted from the pixels. An array of adjustable light deflecting devices is mounted in front of the pixels. Each of the adjustable light deflecting devices is structured to deflect the light emitted by the pixels. At least one controller is configured to (1) vary at least one of the intensity or color of light emitted by each of the pixels according to three-dimensional information set for display of a three dimensional image; and (2) change a deflection angle of the light deflecting devices during a period of image integration of the human visual system.