Mixed Reality Device with Multi-Depth Optical Architecture
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Solution Overview
Problem
Mixed reality devices face challenges in meeting stringent display requirements for near-eye devices while also overcoming the vergence-accommodation conflict (VAC), which reduces wearing comfort and limits application fields.
Innovation Solution
The mixed reality device employs an optical architecture with different focal lengths, utilizing a system that includes a first and second image source, a beam splitter, and multiple lens elements to converge images of different depths onto an eye box, effectively avoiding VAC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single focal length display screen is used, then the device structure is simple, but it causes vergence-accommodation conflict and reduces wearing comfort
Solution Approach 1:
The patent divides the display system into multiple independent image sources (first image source and second image source) with different focal lengths. The first image source displays virtual images at a first focal length while the second image source displays virtual images at a second focal length, allowing users to view images at multiple depths simultaneously and eliminate vergence-accommodation conflict.
Solution Approach 2:
The patent introduces a depth dimension to the display system by using multiple focal lengths. Instead of displaying all images at a single fixed focal length, the system creates virtual images at different depths (first focal length and second focal length), adding the depth dimension to resolve the conflict between vergence and accommodation.
2Adaptability or versatility
If multiple image sources with different focal lengths are used, then stereoscopic vision and different depth images can be converged, but the optical architecture becomes more complex
Solution Approach 1:
The patent combines multiple image sources with different focal lengths into a single integrated display system. The first image source and second image source are both coupled to the same eye box, allowing their respective virtual images to be converged at different depths simultaneously, achieving stereoscopic vision and multi-depth display capabilities.
Solution Approach 2:
The patent introduces a beam splitter as an intermediary optical element to combine the light paths from the first image source and second image source. The beam splitter directs the first image beam and second image beam to converge at the eye box, enabling multiple focal lengths to work together in a coordinated manner.
3Ease of operation
If images at different depths are displayed simultaneously, then VAC is avoided, but the field of view is limited
Solution Approach 1:
The patent uses dynamic optical elements including a variable focal length lens and a movable beam splitter to adjust and expand the field of view. The variable focal length lens dynamically adjusts the focal length to match the displayed image depth, while the movable beam splitter dynamically adjusts the light path to expand the field of view, resolving the contradiction between multi-depth display and field of view.
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 solution provides a comfortable wearing experience by enabling stereoscopic vision with images of different depths converged simultaneously, thereby expanding the field of view and reducing VAC.
Implementation Method 1
a beam splitter, a first lens set, and a second lens set. The first image source is configured to provide a first image beam. The second image source is configured to provide a second image beam. The beam splitter is disposed on paths of the first image beam and the second image beam.
Implementation Method 2
The first lens set is disposed between the second image source and the beam splitter and includes at least one lens element. The second lens set is disposed on the paths of the first image beam and the second image beam and includes multiple lens elements. The first image beam and the second image beam are imaged on an eye box of the mixed reality device after moving backward and forward between the lens elements of the second lens set.
Data Source
AI summary
Provided is a mixed reality device including a Fourier 4F optical architecture and a design of folding a light path to display images of different depths. In addition to achieving real-time multi-depth and mixed reality display effects, it may also have a wide field of view and effectively avoid a vergence-accommodation conflict.