Flip-Up HMD Detection Unit Orientation
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Solution Overview
Problem
Existing head-mounted displays (HMDs) with flip-up mechanisms cannot detect when the observer is not looking at the display unit when the flip-up mechanism is activated, leading to potential power consumption issues and inaccurate detection.
Innovation Solution
The HMD incorporates a display device with an observation optical system and a detection unit, where the detection unit is positioned to direct its center line downward relative to the optical axis of the observation system, allowing for accurate proximity detection even when the display is flipped up.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the detection unit is positioned to detect proximity of the HMD to the observer's face, then power consumption can be suppressed by switching between operation and non-operation states, but when the flip-up mechanism is activated, the detection unit cannot accurately detect that the observer is not observing the display unit
Solution Approach 1:
The detection unit's detection range direction is dynamically adjusted to be directed downward with respect to the optical axis direction of the observation optical system. This dynamic orientation allows the detection unit to accurately detect whether the observer is observing the display unit in both normal and flip-up positions, resolving the detection accuracy issue while maintaining power consumption benefits
2Adaptability or versatility
If the HMD includes a flip-up mechanism to allow direct viewing of surroundings, then versatility is improved, but the existing detection configuration cannot detect observer state when flip-up is activated
Solution Approach 1:
The detection unit is configured with a downward-directed detection range relative to the optical axis, creating a dynamic detection geometry that maintains reliable operation regardless of the display device's angular position. This ensures detection reliability is preserved across both normal viewing and flip-up viewing modes
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
This configuration effectively prevents erroneous detection and reduces power consumption by ensuring accurate detection of the observer's gaze, even when the display is in the flip-up position.
Implementation Method 1
a detection unit that detects proximity of the display device to a face of the observer
Implementation Method 2
an observation optical system that guides light to an eye of the observer
Data Source
AI summary
A head mounted display includes a head mounted device configured to be mounted on a head of an observer, and a display device configured to be supported by the head mounted device so as to be capable of being flipped up, wherein the display device includes an observation optical system that guides light to an eye of the observer, and a detection unit that detects proximity of the display device to a face of the observer, and wherein the detection unit is disposed so that a center line of a detection range of the detection unit is directed downward with respect to an optical axis direction of the observation optical system.