Freeform Optical Display System with Addressable Focus
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Solution Overview
Problem
Conventional stereoscopic displays suffer from accommodation-convergence conflict due to decoupling of accommodation and convergence cues, which are tied to a fixed focal distance, limiting their effectiveness in virtual and augmented reality applications.
Innovation Solution
A method and system utilizing a freeform optical display system with addressable focus, which includes a primary and secondary freeform optical elements in a tiled arrangement, along with a variable focusing mechanism to adjust focal distances, allowing for independent control of accommodation and convergence cues, thereby resolving the accommodation-convergence conflict.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional stereoscopic displays use fixed focal distance, then device complexity is reduced, but accommodation-convergence conflict occurs and visual comfort deteriorates
Solution Approach 1:
The patent implements variable focus optical elements that can dynamically adjust their focal distance based on the displayed content depth. This allows the optical system to adaptively change focus for different virtual objects at different depths, resolving the accommodation-convergence conflict by matching the focal distance to the perceived depth of virtual content, thereby improving visual comfort without requiring overly complex fixed multi-focal systems
Solution Approach 2:
The system changes the focal distance parameter of the optical elements to match the depth of virtual content being displayed. By dynamically adjusting this optical parameter based on content requirements, the system resolves the conflict between fixed-focus simplicity and variable-focus visual comfort, achieving both through intelligent parameter control
2Area of stationary object
If freeform optical elements with variable focus are used, then field of view is expanded and image quality is improved, but device complexity increases
Solution Approach 1:
The patent divides the optical system into multiple freeform optical elements, each responsible for specific field of view regions and focus ranges. This segmentation allows the system to achieve wide field of view and high image quality by combining multiple specialized elements rather than requiring a single complex element, making the complexity more manageable and modular
Solution Approach 2:
The freeform optical elements are designed to perform multiple functions simultaneously: they expand field of view, correct optical aberrations, and provide variable focus control. This multi-functionality reduces the need for separate optical components, thereby managing overall device complexity while achieving superior performance
3Manufacturing precision
If accommodation and convergence cues are decoupled from fixed focal distance, then stereoscopic realism is improved, but control system complexity increases
Solution Approach 1:
The system employs feedback control mechanisms that monitor the depth of displayed content and automatically adjust the focal distance of optical elements accordingly. This feedback loop ensures that accommodation cues match convergence cues by linking focus adjustment to content depth information, achieving accurate stereoscopic rendering while managing control complexity through automated closed-loop control
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 an expanded field of view and accurate rendering of stereoscopic images by decoupling accommodation and convergence cues from a fixed focal distance, enhancing the realism and comfort of virtual and augmented reality experiences.
Implementation Method 1
one or more refractive surfaces and one or more reflective surfaces
Implementation Method 2
one or more refractive surfaces and one or more reflective surfaces
Implementation Method 3
variable focusing mechanism to adjust focal distances
Data Source
AI summary
Several unique hardware configurations and methods for freeform optical display systems are disclosed. A freeform display system includes primary freeform optical element(s) and secondary freeform optical element(s) in tiled arrangements to expand the horizontal field of view (FOV) or the vertical field of view. The system may include a variable focusing system that produces intermediate pupil and changes the focal distance of a single focal plane or switches among multiple focal planes for rendering objects in focus while resolving accommodation-convergence conflict. The system may map light samples to appropriate light rays in physical space and use a cluster of projectors to project the mapped light rays to produce the light field of the virtual display content. Methods for making tiled freeform optical display systems and methods for producing virtual content with variable focus freeform optics and rendering light fields are also disclosed.