Fresnel Lens Positioning via High Contrast Image Projection
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Solution Overview
Problem
Determining an accurate interpupillary distance for head-mounted display devices without professional assistance is challenging, leading to incorrect setups and reduced user experience.
Innovation Solution
A method and device utilizing a high contrast image projected through Fresnel lenses or anisotropic light scattering elements to provide visual cues for adjusting the lens positions, allowing users to accurately determine and adjust interpupillary distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If professional assistance is used to determine interpupillary distance, then measurement precision is improved, but device complexity and ease of operation worsen due to requiring external expertise
Solution Approach 1:
The system enables users to perform their own interpupillary distance measurements without requiring professional assistance. The display device presents alignment patterns that users can independently adjust and evaluate, transforming a professional service into a self-service operation while maintaining measurement accuracy
Solution Approach 2:
The patent uses visual alignment patterns with high contrast and specific color characteristics that change or differentiate based on alignment quality. These visual cues enable users to objectively assess alignment without professional training, improving ease of operation while maintaining measurement precision
2Measurement precision
If professional assistance is required for setup, then measurement precision is improved, but device complexity increases due to additional calibration requirements
Solution Approach 1:
The alignment patterns and visual cues are designed to be inherently self-explanatory, allowing users to perform calibration without professional guidance. The system eliminates the need for external calibration tools or expertise, reducing device complexity while maintaining measurement precision
Solution Approach 2:
Visual alignment patterns serve as an intermediary between the complex optical system and the user. These patterns translate complex optical alignment requirements into simple visual tasks that users can perform intuitively, reducing the perceived complexity while maintaining precision
3Ease of operation
If visual alignment patterns are used, then ease of operation is improved, but manufacturing precision requirements worsen due to high contrast image quality demands
Solution Approach 1:
The system uses high contrast ratios and specific luminance parameters in the alignment patterns to enhance visibility and alignment detection. By optimizing these visual parameters, the system achieves excellent ease of operation while the high contrast requirements are met through standard display manufacturing capabilities rather than exceptional precision
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
Enables users to accurately set up head-mounted displays for correct interpupillary distances, improving user experience by using visual artifacts from the projected images to guide lens positioning.
Implementation Method 1
projecting the first high contrast image through a first anisotropic light scattering element to provide a cue for adjusting a location of the first anisotropic light scattering element
Data Source
AI summary
A method includes displaying a high contrast image on a display screen; and projecting the high contrast image through a Fresnel lens to provide a cue for adjusting a position of the Fresnel lens. Also disclosed is a device for determining and/or adjusting an offset of a Fresnel lens. The device includes a Fresnel lens and a display screen configured to project a high contrast image through the Fresnel lens. Further disclosed is a method for adjusting a position of a Fresnel lens. The method includes receiving a projection of a high contrast image transmitted through a Fresnel lens; and adjusting a position of the Fresnel lens based on the projection of the high contrast image.