Optical-Waveguide Display Module with Time-Multiplexed Light Sources
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Solution Overview
Problem
Existing three-dimensional display technologies suffer from Vergence-Accommodation Conflict (VAC), causing visual discomfort due to inconsistency between monocular focusing depth and binocular convergence depth, which is not addressed effectively by current methods.
Innovation Solution
An optical-waveguide display module with multiple light sources is designed, featuring a light-source array with orthogonal-characteristic or ordinary light sources that are switched on and off sequentially, combined with a relay device, display device, optical waveguide, and converging device to project two-dimensional images into the pupil, reducing divergence and aligning focus with binocular convergence depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only binocular parallax is used for three-dimensional display, then the display structure is simple, but Vergence-Accommodation Conflict occurs causing visual discomfort
Solution Approach 1:
The patent employs time-sequential switching of multiple light sources where each light source is activated at different time points within a time cycle. This periodic action allows multiple two-dimensional images to be projected sequentially to different pupils, creating the perception of three-dimensional depth without causing VAC, as the human visual system integrates the sequential images
Solution Approach 2:
The patent transitions from traditional two-dimensional display to three-dimensional display by adding the depth dimension through binocular parallax. By projecting different two-dimensional images to left and right pupils at different time points, the system creates genuine three-dimensional spatial perception that aligns with natural human vision
2Object-affected harmful factors
If Maxwellian view technology is used to reduce light intensity gradient, then focusing attractiveness is enhanced, but optical system complexity increases
Solution Approach 1:
Instead of using complex Maxwellian view optics to create continuous light intensity gradients, the patent achieves similar focusing effectiveness through time-sequential light source switching. Each light source projects to a specific pupil at a specific time, creating discrete but effective focusing points that accumulate to produce the desired three-dimensional effect with simpler optics
Solution Approach 2:
The patent divides the illumination function into multiple segmented light sources, each responsible for projecting to a specific pupil at a specific time point. This segmentation replaces the need for complex continuous optical gradient systems with simpler discrete light sources that achieve the same visual effect through temporal multiplexing
3Object-affected harmful factors
If more than one two-dimensional image is projected to each pupil, then VAC-free display is achieved, but light source requirements increase
Solution Approach 1:
The patent uses time-sequential switching to allow multiple light sources to serve multiple pupils in a time-multiplexed manner. Each light source projects to a specific pupil at a specific time point within a time cycle, reducing the total number of light sources needed compared to simultaneous multi-pupil illumination
Solution Approach 2:
The patent introduces dynamic temporal control of light source activation, where light sources are switched on and off sequentially based on timing characteristics. This dynamic switching allows the same light source to effectively serve multiple pupils at different times, reducing the static quantity of light sources required
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 by guiding two-dimensional images through a thin optical waveguide, ensuring consistent focus and reducing visual discomfort, suitable for near-eye display and implementing Maxwellian view or More-than-one-view-one-pupil technologies.
Implementation Method 1
an optical waveguide device, which guides light from the display device
Implementation Method 2
The light from the light-source array of timing-orthogonal-characteristic or the light-source array of timing-characteristic gets divergence decreased by the relay device
Data Source
AI summary
The invention discloses an optical-waveguide display module with multiple light sources, including a light-source array of timing-orthogonal-characteristic, a relay device, a display device of orthogonal-characteristic, an optical waveguide device, a converging device, a control device, and other components. The light-source array of timing-orthogonal-characteristic includes more than one orthogonal-characteristic light sources. All orthogonal-characteristic light sources are switched on and off in each time cycle sequentially, with only one orthogonal-characteristic light source being switched on at a time-point of each time cycle. By designing the spatial distribution of converging spots of lights from different orthogonal-characteristic light sources, one two-dimensional image is projected into the pupil of the viewer in each time cycle, which realizes VAC-free three-dimensional display based on Maxwellian view technology or More-than-one-view-one-pupil technology.