Asymmetrical Divergence Angle 3D Display Module
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Solution Overview
Problem
Existing 3D display technologies suffer from vergence-accommodation conflict (VAC), which causes visual discomfort due to inconsistencies between binocular convergence depth and monocular accommodation depth, limiting their wide application.
Innovation Solution
A display module using divergent beams with an asymmetrical divergence angle, comprising a light engine, divergence-angle modulation element, and combiner, which projects beams with a small divergence angle laterally and a larger angle vertically, allowing the combiner to converge beams to corresponding viewing zones, reducing VAC and providing a consistent depth perception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If stereoscopic technology is used to present depth information through binocular parallax, then depth perception is achieved, but vergence-accommodation conflict occurs causing visual discomfort
Solution Approach 1:
The patent employs asymmetrical divergence angle of light beams, where the divergence angle in the horizontal direction differs from that in the vertical direction. Specifically, the beams diverge at a smaller angle horizontally and a larger angle vertically, creating an asymmetrical beam pattern that resolves the vergence-accommodation conflict by aligning binocular convergence with monocular accommodation depth
Solution Approach 2:
The patent changes the divergence angle parameter of the light beams to achieve the desired optical effect. By controlling the beam divergence angles to be asymmetrical (different in horizontal and vertical directions), the system creates a 3D display that eliminates VAC conflict while maintaining depth perception accuracy
2Measurement precision
If Maxwellian view or Super multi-view technology is used to alleviate VAC, then depth consistency is improved, but optical structure complexity increases
Solution Approach 1:
The patent extracts the essential function of VAC resolution by using asymmetrical beam divergence alone, without requiring complex optical structures like Maxwellian views or Super multi-view systems. This approach isolates the key mechanism (asymmetrical divergence) that achieves depth consistency, eliminating the need for additional complex optical components
Solution Approach 2:
Instead of using complex optical structures to achieve VAC resolution, the patent inverts the approach by using a simple asymmetrical beam divergence configuration that directly addresses the root cause of VAC. The solution goes from complex-to-simple rather than simple-to-complex
3Device complexity
If symmetrical divergence angle is used for beam projection, then optical structure remains simple, but field of view and depth perception are limited
Solution Approach 1:
The patent introduces asymmetry in beam divergence angles to expand the field of view and improve depth perception. By making the horizontal and vertical divergence angles different, the system achieves a larger effective field of view while maintaining relatively simple optical structure, resolving the trade-off between complexity and versatility
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 enables a 3D display that minimizes VAC, providing a comfortable viewing experience by ensuring consistent binocular convergence and monocular accommodation depths, allowing for a thin optical structure and potential glasses-free binocular display.
Implementation Method 1
The beams emitted from each projection point of the light engine are modulated, by the divergence-angle modulation element, into a bunch of beams with an asymmetrical divergence angle. Such a bunch of beams cover a rather large region on the combiner, by oblique incidence along a direction at a small divergence angle and by incidence along another direction at a large divergence angle.
Implementation Method 2
Then, the combiner converges incident beams from different projection points to corresponding viewing zones, respectively, implementing a Maxwellian view 3D display or a Super multi-view 3D display
Implementation Method 3
Such a bunch of beams cover a rather large region on the combiner, by oblique incidence along a direction at a small divergence angle
Data Source
AI summary
The present invention discloses a display module based on divergent beams with an asymmetrical divergence angle, which includes a light engine, a divergence-angle modulation element, a combiner, and a controller. The beams emitted from each projection point of the light engine are modulated, by the divergence-angle modulation element, into a bunch of beams with an asymmetrical divergence angle. Such a bunch of beams cover a rather large region on the combiner, by oblique incidence along one direction at a small divergence angle and by incidence along another direction at a large divergence angle. Then, the combiner converges incident beams from different projection points to corresponding viewing zones respectively, for a Maxwellian view 3D display or a Super multi-view 3D display.