HMD Liquid Crystal Lens Vision Correction
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Solution Overview
Problem
Users with vision conditions, such as myopia, hyperopia, or presbyopia, experience discomfort when wearing glasses and a head-mounted display (HMD) simultaneously, as the combined setup can cause vision alignment issues and discomfort.
Innovation Solution
A head-mounted display (HMD) apparatus incorporating a liquid crystal (LC) lens device with adjustable focal length to correct vision by changing the convergence of ambient and display light, allowing users to see both real-world and computer-generated images clearly without glasses, and adjusting the virtual position of the computer-generated image to match the observer's field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If users wear glasses and HMD simultaneously, then vision correction is achieved, but user comfort deteriorates
Solution Approach 1:
The patent combines the HMD display function with the glasses function into a single integrated device. The HMD includes a display unit that projects images and a lens unit that provides vision correction, merging two separate devices (glasses and HMD) into one unified system that delivers both augmented reality display and optical correction simultaneously
Solution Approach 2:
The HMD device is designed to perform multiple functions: it serves as both an augmented reality display device and a vision correction device. The lens unit can provide different degrees of magnification and correction for various vision conditions, while the display unit presents virtual images, making the device universally applicable to users with different vision requirements
2Device complexity
If HMD is used without vision correction, then device simplicity is maintained, but image clarity deteriorates for users with vision conditions
Solution Approach 1:
The patent integrates the vision correction lens unit directly into the HMD structure, combining what would otherwise be separate components (glasses lenses and HMD display components) into a single unified system, thereby maintaining simplicity while achieving both display and correction functions
3Device complexity
If fixed focal length lens is used, then device simplicity is maintained, but adaptability to different vision conditions deteriorates
Solution Approach 1:
The patent employs a lens unit with adjustable focal length that can dynamically change its optical properties. The lens unit can be adjusted to provide different degrees of magnification and correction, allowing the HMD to adapt to various vision conditions such as myopia, hyperopia, and presbyopia, as well as different viewing distances and preferences
Solution Approach 2:
The patent changes the optical parameters of the lens unit by allowing adjustment of the focal length. This parameter change enables the lens to provide different magnification levels and correction strengths, making the device adaptable to various vision conditions and user preferences without requiring multiple fixed-focus lenses
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 with different vision conditions to comfortably use the HMD without glasses, providing clear vision of both real-world and computer-generated images by correcting vision and adjusting image positions, thus eliminating the need for customization and reducing user discomfort.
Implementation Method 1
The LC lens device has an adjustable first focal length and is disposed to change convergence of the ambient light and the display light from the HMD device, so as to correct vision of the observer
Implementation Method 2
change convergence of the ambient light and the display light
Implementation Method 3
change convergence of the display light, so as to change a virtual position of the computer-generated image with respect to the observer
Data Source
AI summary
A head-mounted display (HMD) apparatus includes an HMD device and a liquid crystal (LC) lens device. The HMD device has a light entering surface for entrance of ambient light, and a light exit surface. The HMD device permits passage of the ambient light therethrough to form a real world image for an observer who wears the HMD apparatus, and generates and projects display light toward the light exit surface to form a computer-generated image for the observer. The LC lens device has an adjustable focal length and is disposed to change convergence of the ambient light and the display light from the HMD device, so as to correct vision of the observer.