Head-Mounted Display Optical Axis Twist for Unobstructed Field of View
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Solution Overview
Problem
Existing head-mounted display devices often obstruct the wearer's horizontal field of view due to the placement of housings, and there is a need for easier eyepoint and diopter adjustments to accommodate individual variations in pupillary distance and eyesight.
Innovation Solution
A head-mounted display device design where the display unit and eyepiece optical unit are attached to the upper rim of an eyeglass frame, with optical axes twisted relative to each other by forming an angle greater than 90°, allowing for independent sliding along a guide for adjustments and detachability, ensuring a clear horizontal field of view and accommodating different eye specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display unit and eyepiece optical unit are attached to the front housing, then the horizontal field of view is obstructed, but if attached to the upper rim, then the field of view is clear
Solution Approach 1:
The patent relocates the display unit and eyepiece optical unit from the conventional front horizontal plane to the upper rim of the eyeglass frame, utilizing a different spatial dimension (vertical placement) to avoid obstructing the wearer's horizontal field of view while maintaining optical functionality
Solution Approach 2:
The optical system is divided into separable components (display unit, eyepiece optical unit, and optical path unit) that can be independently attached to and removed from the eyeglass frame, allowing for flexible configuration and easy adjustment
2Ease of operation
If the optical axes are coplanar, then the structure is simple, but the eyepoint and diopter adjustments are difficult
Solution Approach 1:
The patent introduces sliding mechanisms that allow the display unit and eyepiece optical unit to move dynamically along the optical path, enabling easy adjustment of eyepoint and diopter settings by the wearer without complex mechanical structures
Solution Approach 2:
The optical components are pre-configured with sliding capabilities and adjustment mechanisms that allow users to perform eyepoint and diopter adjustments simply by sliding the components along the optical path, without requiring complex manual alignment procedures
3Ease of operation
If the housings are made large to accommodate adjustment mechanisms, then the adjustments are easier, but the device becomes bulky
Solution Approach 1:
The adjustment functionality is segmented into the sliding motion of the display unit and eyepiece optical unit along the optical path, eliminating the need for large housing structures to accommodate complex adjustment mechanisms
Solution Approach 2:
The patent replaces complex mechanical adjustment mechanisms with simple sliding motions along the optical path, allowing for easy eyepoint and diopter adjustments without requiring large housings or bulky structures
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
The design ensures a clear horizontal field of view, allows for compact and lightweight construction, and facilitates easy eyepoint and diopter adjustments, accommodating various eye shapes and sizes, while maintaining the image as an enlarged virtual image.
Implementation Method 1
The eyepiece optical unit may include a first reflecting surface that deflects the image light from the display in a forward direction with respect to the wearer; a second reflecting surface that deflects image light from the first reflecting surface in a downward direction with respect to the wearer; and a third reflecting surface that deflects image light from the second reflecting surface toward the wearer's eye.
Data Source
AI summary
A head-mounted display device includes an eyeglass frame, including a rim, for fixing the head-mounted display device onto a wearer's head, a display that displays an image, and an eyepiece optical unit that guides light of an image displayed on the display into at least one of the wearer's eyes to display the image as an enlarged virtual image. The display and the eyepiece optical unit are attached to the rim, an optical axis of incident light that is image light incident on the eyepiece optical unit from the display and an optical axis of exiting light that is image light exiting from the eyepiece optical unit towards the wearer's eye are not coplanar, and the angle between an incident light vector formed by the incident light and an exiting light vector formed by the exiting light is greater than 90°.