Light Field Display Using Segmented Sub-Displays
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Solution Overview
Problem
Current 3D light field displays and cameras face limitations in reconstructing continuous optical light fields with sufficient fidelity, particularly in terms of depth cues, motion parallax, and realism, due to confined volume, transparency issues, and limited size and resolution in existing volumetric and holographic displays, as well as limited views and incorrect optical light field reconstruction in autostereoscopic displays.
Innovation Solution
A method for displaying a light field using a 3D model with spatially distributed display elements, where the viewpoints of the viewer's eyes are determined, and partial view images are rendered and displayed for each display element, with radiance samples associated with different points and directions, allowing for accurate emission of output beams that diverge or are collimated to recreate the light field, incorporating gaze direction and fixation depth estimation for focus adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If volumetric displays are used to generate real 3D images, then depth perception is improved, but the reconstructed scene is confined to the display volume and the entire scene becomes semi-transparent
Solution Approach 1:
The display is divided into multiple sub-displays, each responsible for a specific angular range. This segmentation allows different regions to emit light in different directions, creating a complete light field without requiring the entire scene to be semi-transparent, thus resolving the contradiction between depth perception and scene realism.
Solution Approach 2:
The invention transitions from traditional volumetric 3D displays to a light field display that adds angular dimensionality. By controlling light emission in multiple directions across multiple sub-displays, the system creates a 4D light field (x, y, z, θ) that provides both accurate depth cues and full scene opacity, resolving the realism limitation of volumetric displays.
2Measurement precision
If holographic displays are used to reconstruct optical light fields, then wavefront accuracy is improved, but the display size and resolution are limited
Solution Approach 1:
The holographic display is segmented into multiple sub-displays arranged in an array. Each sub-display handles a portion of the angular spectrum, allowing the system to achieve high wavefront accuracy while scaling to larger overall display areas. This segmentation resolves the contradiction between wavefront precision and display size.
Solution Approach 2:
Instead of attempting to reconstruct the entire light field from a single point, the invention uses multiple sub-displays to collectively emit light across different angular ranges. This partial action approach, where each sub-display handles a specific angular sector, enables both high resolution and large display area by distributing the computational and optical load.
3Ease of operation
If autostereoscopic displays are used to provide stereo images, then viewing comfort is improved, but motion parallax and depth cues are limited
Solution Approach 1:
The invention implements dynamic light field reconstruction that adapts to viewer position and gaze direction. By using multiple sub-displays that can independently control light emission in different angular ranges, the system provides continuous motion parallax and accurate depth cues while maintaining viewing comfort, resolving the contradiction between comfort and motion parallax accuracy.
Solution Approach 2:
The system incorporates gaze tracking and viewer position detection to dynamically adjust which sub-displays are active and how they emit light. This feedback mechanism ensures that the light field is always optimized for the current viewing conditions, providing both comfort and accurate motion parallax by adapting the angular distribution of emitted light based on real-time viewer information.
4Device complexity
If discrete light field sampling is used for practical manipulation, then computational complexity is reduced, but fidelity to the continuous optical light field deteriorates
Solution Approach 1:
The continuous light field is segmented into discrete angular ranges, with each sub-display responsible for a specific sector. This segmentation reduces computational complexity by allowing independent processing of each angular range while maintaining fidelity through the collective emission of all sub-displays, effectively resolving the contradiction between computational simplicity and light field accuracy.
Solution Approach 2:
The invention changes the parameterization of the light field from a continuous function to a discrete set of angular bins, each handled by a specific sub-display. This parameter transformation reduces the infinite-dimensional problem to a finite-dimensional one that is computationally tractable while preserving the essential characteristics of the continuous light field through appropriate sampling and reconstruction.
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 enables a high-fidelity light field display that provides correct depth cues, motion parallax, and realism by accurately reconstructing the optical light field, allowing viewers to experience a seamless and immersive 3D scene with proper depth perception and smooth motion, overcoming the limitations of existing technologies.
Implementation Method 1
displaying, via each display element, the set of partial view images rendered for that display element
Data Source
AI summary
A method of displaying a light field to at least one viewer of a light field display device, the light field based on a 3D model, the light field display device comprising a plurality of spatially distributed display elements, the method including the steps of: (a) determining the viewpoints of the eyes of the at least one viewer relative to the display device; (b) for each eye viewpoint and each of a plurality of the display elements, rendering a partial view image representing a view of the 3D model from the eye viewpoint through the display element; and (c) displaying, via each display element, the set of partial view images rendered for that display element.