HMD Light Source Suspension for Instant See-Through
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Solution Overview
Problem
Existing head-mounted display devices experience time lag when switching from a virtual image mode to a see-through mode during mute operations, hindering quick observation of the outside world.
Innovation Solution
Incorporating a display control unit that turns off light sources and transitions the device to a suspension mode upon receiving a mute request, allowing for immediate see-through functionality, along with sound processing to stop audio output, enabling rapid switching between virtual image and see-through modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the display suspends the image and changes to see-through state upon mute operation, then the observer can check the outside world, but time lag occurs from mute operation until screen changes
Solution Approach 1:
The system performs preliminary preparation by having the see-through state ready to activate immediately when mute operation is detected. The display control unit is pre-configured to switch between virtual image and see-through modes, eliminating processing delays during actual mute operations.
Solution Approach 2:
The display dynamically adjusts its state based on real-time user input. When mute operation is detected, the display control unit immediately transitions the display from virtual image mode to see-through mode, creating a responsive system that adapts instantly to user needs without fixed timing delays.
2Reliability
If the light source remains on during mute operation, then the virtual image continues to be displayed, but the observer cannot quickly check the outside world
Solution Approach 1:
The display control unit is pre-programmed with the logic to detect mute operations and immediately respond by turning off the light source and switching to see-through mode. This preliminary preparation ensures that no time is lost in processing the transition when mute operation occurs.
3Stability of the object's composition
If the screen transitions after processing the mute request, then the system maintains stable operation, but the observer experiences delay in seeing the outside world
Solution Approach 1:
The system performs preliminary preparation by having the see-through state ready to activate immediately when mute operation is detected. The display control unit is pre-configured to switch between virtual image and see-through modes, eliminating processing delays during actual mute operations.
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 user to quickly check the outside world by instantly turning off virtual image and audio outputs when a mute operation is performed, improving convenience and reducing time lag in mode transitions.
Implementation Method 1
The transmissive HMD forms a virtual image in the visual field area of the observer together with the external scenery by causing an optical system or the like arranged before the eyes of the observer to reflect image light generated by a light modulation device such as a liquid crystal panel
Implementation Method 2
The light guide unit that forms a virtual image from the emitted image light
Data Source
AI summary
A head-mounted display device that is mounted on the head of an observer and forms a virtual image before the eyes of the observer includes: a display device that forms an image, which is the source of image light, from image data; a light source that emits the image light representing the formed image; a light guide unit that forms a virtual image from the emitted image light; and a display control unit that turns off the light source and changes the head-mounted display device to a suspension mode when a suspension request is received from the outside.