Multi-focal Plane Display System Alleviating Vergence-Accommodation Conflict
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Solution Overview
Problem
Existing multi-focal plane display systems for augmented and virtual reality have complex structures, making them inconvenient for manufacturing and affecting user experience due to vergence-accommodation conflicts.
Innovation Solution
A simplified multi-focal plane display system utilizing a laser projection optical engine and a holographic reflective optical fusion device, which generates and modulates laser beam groups to create multiple focal planes, allowing users to view images at different depths without dizziness, using a compact and lightweight design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple liquid crystal projectors and diffractive optical waveguides are used to generate multiple focal planes, then the vergence-accommodation conflict is alleviated, but the device structure becomes complex and manufacturing becomes inconvenient
Solution Approach 1:
The patent combines multiple laser sources (first and second laser sources) into a single integrated laser projection optical engine, and merges multiple optical paths through a unified holographic reflective optical fusion device. This consolidation maintains the multi-focal plane capability while significantly simplifying the overall system structure compared to using separate projectors and waveguides for each focal plane.
Solution Approach 2:
The holographic reflective optical fusion device serves multiple functions simultaneously: it acts as a beam combiner for different laser sources, functions as an optical fusion element to create multiple focal planes, and serves as an exit pupil alignment mechanism. This multi-functionality reduces the need for separate dedicated components for each function, thereby simplifying the system.
2Reliability
If multiple separate optical systems are used for each eye to achieve multi-focal plane display, then depth information is provided, but the device becomes bulky and difficult to manufacture
Solution Approach 1:
The patent uses a single laser projection optical engine to generate laser beams for both the left and right eyes, and a single holographic reflective optical fusion device to handle the optical paths. This unified approach maintains stereoscopic depth perception while making the device much more compact and manufacturable compared to having completely separate optical systems for each eye.
3Ease of manufacture
If a simplified optical system is used, then manufacturing becomes easier, but the ability to provide multiple focal planes may be compromised
Solution Approach 1:
The patent controls the divergence angles of laser beams from different laser sources by adjusting optical parameters (such as using beam expanding lenses with specific focal lengths). By precisely controlling these angular parameters, the system achieves proper focal plane separation and exit pupil alignment, maintaining multi-focal plane capability while using a simplified optical architecture.
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 system effectively alleviates vergence-accommodation conflicts, providing a comfortable user experience by simplifying the architecture and facilitating the manufacturing of AR and VR devices, while maintaining a compact and lightweight design.
Implementation Method 1
the holographic reflective optical fusion device is disposed on an emergent optical path of the laser projection optical engine, and is configured to reflect the at least two laser beam groups
Data Source
AI summary
A multi-focal plane display system and a device are provided. The multi-focal plane display system includes a laser projection optical engine and a holographic reflection light fusion device. The laser projection optical engine is configured to generate and modulate at least two laser beam groups, and transmit the at least two laser beam groups to the holographic reflective optical fusion device, where each laser beam group corresponds to one displayed image. The holographic reflective optical fusion device is configured to reflect the at least two laser beam groups, where exit pupil locations of the at least two laser beam groups are the same, and displayed images of at least two focal planes are obtained by performing imaging on the at least two laser beam groups by a human eye. A structure of the multi-focus plane display system provided in the embodiments is easy to implement.