Adjustable Optical Element for Dual-Mode HMD Projection
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Solution Overview
Problem
Current wearable computing systems with head-mounted displays (HMDs) lack the ability to seamlessly switch between internal and external image projection configurations, limiting their functionality in providing both augmented reality experiences and interactive virtual interfaces while maintaining a view of the real-world environment.
Innovation Solution
A wearable computing system with a head-mounted display (HMD) that includes an optically coupled display panel and an adjustable optical element, allowing images to be viewed internally or projected externally by switching between configurations, enabling the wearer to observe real-world surroundings and virtual images simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an HMD uses a fixed optical configuration to display images internally, then the wearer can view virtual images at an internal viewing location, but the system cannot project images externally
Solution Approach 1:
The patent applies the dynamics principle by making the optical element adjustable between different configurations. The optical element can be switched between a first configuration for internal viewing and a second configuration for external projection, allowing the system to adapt its optical path dynamically based on operational requirements without requiring separate fixed optical systems.
Solution Approach 2:
The patent implements universality by designing a single optical element that serves multiple functions. This adjustable optical element can function as both an internal display optical component and an external projection optical component, eliminating the need for separate dedicated optical systems for each function and thereby reducing overall device complexity.
2Adaptability or versatility
If the HMD projects images externally, then the wearer can display virtual interfaces externally, but the view of the real-world environment may be obstructed
Solution Approach 1:
The system dynamically switches the optical configuration based on operational needs. When external projection is required, the optical element transitions to the second configuration that directs images externally. When viewing the real world is required, the system transitions to the first configuration that allows internal viewing, thus dynamically avoiding obstruction of the real-world view.
Solution Approach 2:
The system alternates between internal viewing and external projection modes in a periodic manner depending on user needs. The optical element is adjusted between configurations to switch between these modes, allowing the wearer to periodically engage with virtual interfaces while maintaining the ability to view the real environment when needed.
3Ease of operation
If the optical element is adjusted between configurations, then the system can switch between internal and external viewing modes, but the switching mechanism adds complexity
Solution Approach 1:
The optical adjustment mechanism is designed to be self-contained within the HMD system. The computer or controlling device automatically adjusts the optical element between configurations based on software control, eliminating the need for manual mechanical adjustments or complex external mounting mechanisms. This integration simplifies the overall system while maintaining ease of mode switching.
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 the wearer to interact with virtual interfaces and overlay virtual information on the real world without obstructing the view of the environment, enhancing usability and functionality in daily activities.
Implementation Method 1
an optical element optically coupled to the display panel and adjustable between a first configuration and a second configuration. The images generated by the display panel are viewable at an internal viewing location when the optical element is in the first configuration and the images generated by the display panel are projected externally from the HMD when the optical element is in the second configuration
Data Source
AI summary
A wearable computing system may include a head-mounted display (HMD) and an optical system with a display panel configured to generate images. The optical system may include an optical element that is adjustable between at least a first configuration and a second configuration. When the optical element is in the first configuration, the images generated by the display panel are viewable at an internal viewing location. When the optical element is in the second configuration, the images generated by the display panel are projected externally from the HMD. For example, the location, refractive index, reflectance, opacity, and/or polarization of the optical element could be adjusted.