Head-Mounted Display Rotation for Switchable Field of View
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Solution Overview
Problem
Existing electronic devices with displays struggle to efficiently accommodate both horizontal and vertical field-of-view orientations, limiting the versatility and comfort in displaying content.
Innovation Solution
The displays in head-mounted devices are designed to be rotatable or expandable between horizontal and vertical field-of-view modes, with mechanisms such as motors, user-controlled movement, and encoders/detents to adjust display positions, and optical systems that can modify content orientation based on these positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display is fixed in a single orientation, then the device structure is simple, but the device cannot accommodate both horizontal and vertical field-of-view modes
Solution Approach 1:
The display is made dynamically adjustable between horizontal and vertical orientations through rotation mechanisms. The display can be rotated about a first axis to switch between field-of-view modes, transforming a static component into a dynamic one that adapts to different viewing requirements.
Solution Approach 2:
The display system is segmented into independently adjustable components including the display element, optical module, and housing sections. This segmentation allows each component to be optimized and adjusted separately, enabling the display to achieve multiple orientations without requiring complete system redesign.
2Adaptability or versatility
If the display is made rotatable between horizontal and vertical modes, then content orientation versatility is improved, but the device weight increases
Solution Approach 1:
The display assembly incorporates rotation mechanisms that allow the display to dynamically change orientation. By making the display rotatable about a first axis, the system achieves versatility in content orientation while using efficient rotational joints that minimize unnecessary mass.
3Measurement precision
If motors are used to move the display between positions, then positioning precision is improved, but the device complexity and power consumption increase
Solution Approach 1:
An encoder is integrated into the rotation mechanism to provide feedback on the display's angular position. This feedback system enables precise control of the display orientation by monitoring the rotational position and adjusting accordingly, achieving accurate positioning without requiring complex mechanical control systems.
Solution Approach 2:
The patent replaces complex mechanical positioning systems with a combination of simple rotation mechanisms and electronic encoding. Instead of using sophisticated mechanical linkages for precise positioning, the system uses a rotatable joint with an encoder that provides digital feedback for accurate position control.
4Adaptability or versatility
If the display is made expandable to accommodate different orientations, then field-of-view adaptability is improved, but the manufacturing complexity increases
Solution Approach 1:
The display assembly is divided into separable modules including the display element, optical module, and housing sections that can be manufactured independently and assembled through standardized interfaces. This modular segmentation simplifies manufacturing by allowing each component to be produced using optimized processes and assembled with repeatable procedures.
Data Source
AI summary
A head-mounted device may include one or more displays, which may be movable between a first state in which the displays are in a horizontal field-of-view mode and a second state in which the displays are in a vertical field-of-view mode. The displays may be rotatable or expandable between the first state and the second state. An encoder and/or detents determine positions of the displays, and content on the displays may be modified based on the determined positions. The displays may be moved by one or more motors and/or by a user of the device. The displays may be rotatable in a single plane or may be rotatable in multiple planes. An entirety of the displays or portions of the displays, such as projectors and/or waveguides, may be moved to move the displays between the first and second states.