Varifocal Display for Head-Mounted Augmented Reality
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Solution Overview
Problem
Traditional artificial-reality systems have limitations such as a limited field of view and static focal points, which constrain user experience by restricting peripheral vision and natural viewing habits.
Innovation Solution
A head-mounted display system incorporating a varifocal display that adjusts focal distance based on eye movement, using a mapping subsystem to track the environment and an eye-tracking subsystem to adjust focal length, providing a wider field of view and more natural interaction with digital content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a static focal point is used to direct user vision, then the device can maintain a simple optical structure, but the user's field of view and natural viewing range are limited
Solution Approach 1:
The patent implements a varifocal display system that dynamically adjusts the focal length of the optical structure based on detected eye movement. The focal point transitions from a fixed position to a variable position that adapts to the user's natural viewing habits, thereby expanding the effective field of view without requiring the user to consciously adjust their gaze direction.
Solution Approach 2:
The system incorporates eye-tracking sensors that continuously monitor the user's eye movement and provide feedback to the control system. This feedback loop enables real-time adjustment of the varifocal display's focal length, allowing the optical structure to adapt dynamically to the user's viewing behavior and maintain an expanded field of view.
2Ease of operation
If the focal length is adjusted to suit natural eye movement, then user immersion and comfort are improved, but the device requires complex eye-tracking and varifocal mechanisms
Solution Approach 1:
The varifocal display system operates autonomously by using eye-tracking sensors to detect the user's natural eye movement and automatically adjusting the focal length accordingly. The system serves itself by eliminating the need for manual intervention or conscious user adjustment, thereby improving ease of operation despite the underlying complexity of the tracking and adjustment mechanisms.
3Adaptability or versatility
If a limited field of view is used in traditional AR headsets, then the optical design can be simplified, but peripheral vision and user experience are constrained
Solution Approach 1:
The patent employs a dynamic optical design where the focal length of the display is continuously adjustable based on eye-tracking data. This dynamic capability allows the system to effectively expand the user's peripheral vision by shifting the focal point to match natural eye movement, thereby improving adaptability without permanently complicating the base optical design.
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
Enhances user experience by offering a wider field of view and more flexible interaction with digital content, allowing for natural eye movement and improved immersion in augmented and virtual reality environments.
Implementation Method 1
The mapping subsystem may include one or more projectors that project structured light into the local environment, an array of depth cameras that captures reflections of the structured light from the local environment
Implementation Method 2
one or more lenses that focus the computer-generated images from the electronic display
Implementation Method 3
a combiner that reflects the computer-generated images projected from the electronic display toward the user's eyes
Data Source
AI summary
A head-mounted display system may include a wearable frame securable to a user's head. The head-mounted display system may also include a mapping subsystem that maps a local environment of the user when the wearable frame is secured to the user's head. Additionally, the head-mounted display system may include a varifocal display apparatus mounted to the wearable frame and configured to direct computer-generated images toward the user's eyes at a variable focal length. Various other apparatuses, systems, and methods are also disclosed.