AR Display Lens System for Eyeglass-Free Vision Correction
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Solution Overview
Problem
Conventional near-eye displays for augmented reality systems have a limited adjustable range of optical power, which can be incompatible with viewers wearing eyeglasses, affecting the field of view and requiring cumbersome eyeglasses to be placed between the user and the display for proper image viewing.
Innovation Solution
An optical display system comprising an augmented reality device and a lens device with a focus lens unit and a variable focus lens, allowing for continuous adjustment of the combined image focus to accommodate different vision corrections, eliminating the need for external eyeglasses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the distance between the near-eye display and the eye is kept at a limited range (15-20 mm), then the field of view is improved, but viewers wearing eyeglasses cannot maintain this distance and the field of view is adversely affected
Solution Approach 1:
The optical system is divided into multiple lens elements with different optical powers arranged in sequence. Each lens element contributes to the overall optical power, allowing the system to achieve a wider range of effective optical powers than a single lens could provide, thereby accommodating viewers with different vision requirements while maintaining the near-eye display at a fixed distance.
Solution Approach 2:
The system changes the optical parameters by combining multiple lens elements with different optical powers. This allows the effective optical power of the system to be adjusted to accommodate different viewing conditions, including cases where viewers are wearing eyeglasses, thus expanding the adaptable range while maintaining the fixed display distance for optimal field of view.
2Area of stationary object
If eyeglasses are placed between the user and the near-eye display for vision correction, then the field of view is maintained, but the operation becomes cumbersome
Solution Approach 1:
The vision correction function is merged with the near-eye display optical system. The multiple lens elements are integrated into the display device itself, combining the functions of vision correction and display optics into a single unified system. This eliminates the need for separate eyeglasses, making the viewing experience more convenient while maintaining the field of view.
3Device complexity
If a single lens with fixed optical power is used, then the structure is simple, but the adjustable range of optical power is limited
Solution Approach 1:
Instead of using a single lens element, the optical system is segmented into multiple lens elements with different optical powers. This segmentation allows the system to achieve a wider range of effective optical powers through their combined effect, significantly expanding the adaptable range while keeping each individual lens element relatively simple in structure.
Solution Approach 2:
The multi-element lens system serves multiple functions: it provides vision correction for different prescription strengths, maintains the near-eye display at optimal distance, and accommodates various viewing conditions. This multi-functionality is achieved through the coordinated action of multiple lens elements, each contributing to the overall optical performance.
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 a wider adjustable range of optical power, allowing viewers to directly view combined images from the augmented reality device without needing vision correction eyeglasses, improving the field of view and user experience.
Implementation Method 1
The focus lens unit is disposed proximate to the output surface, and is configured to shift a focus of a combined light that results in the combined image
Implementation Method 2
The variable focus lens is disposed distal from the output surface, and is configured to continuously shift the focus of the combined light that is being focused by the focus lens unit
Data Source
AI summary
An optical display system includes an augmented reality device and a lens device. The augmented reality device has an output surface which is disposed to permit a combined image from the augmented reality device to be direct to an eye of a viewer. The lens device is disposed between the output surface and the eye of the viewer, and includes a focus lens unit and a variable focus lens. The focus lens unit is disposed proximate to the output surface, and is configured to shift a focus of a combined light contributed to the combined image. The variable focus lens is disposed distal from the output surface, and is configured to continuously shift the focus of the combined light that is being focused by the focus lens unit.