Head-Mounted Display with Spatially Separated Optical Transfer
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Solution Overview
Problem
Existing head-mounted image display devices burden the observer with increased mass and size due to power requirements for light emitting units, actuators, and drive circuits, leading to positional issues and image deviation from the pupil, making it difficult to observe the image effectively.
Innovation Solution
A display apparatus with spatially separated eyepiece and image display devices, utilizing a control unit, position detection devices, and a transfer-optical-device control system to accurately position the image on the observer's retina without the need for power-intensive components, using infrared light and optical path synthesizing units to correct image alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power supply and power-intensive components (light emitting unit, actuator, drive circuit) are provided in the head-mounted unit, then image projection capability is achieved, but mass and size of the head-mounted unit increase, imposing burden on the observer
Solution Approach 1:
The system is divided into two separate units: a head-mounted eyepiece optical device worn by the observer and a body-worn image display device containing all power-intensive components (image forming device, transfer optical device, position detection devices). This segmentation allows the head-mounted unit to be lightweight while the body-worn unit handles power consumption and image projection control.
Solution Approach 2:
A transfer optical device acts as an intermediary between the image forming device in the body-worn unit and the eyepiece optical device in the head-mounted unit. This intermediary transmits the projected image through space, enabling the separation of power-intensive components from the observer's head while maintaining image delivery capability.
2Weight of moving object
If light emitting unit, actuator, and drive circuit are removed from the head-mounted unit, then mass and size are reduced, but positional relationship between body carrying unit and head-mounted unit collapses when observer moves, causing image deviation from pupil
Solution Approach 1:
Position detection devices in both the head-mounted unit and body-worn unit continuously detect the positions of the eyepiece optical device and body carrying unit. The control unit receives this position information and adjusts the transfer optical device in real-time to maintain proper alignment between the projected image and the observer's pupil, even during movement.
Solution Approach 2:
The system dynamically adjusts the position of the transfer optical device based on real-time position detection data. When the observer moves, the control unit calculates the changed positional relationship and repositions the transfer optical device accordingly, maintaining continuous image alignment without requiring fixed mechanical connections or heavy stabilization components in the head-mounted unit.
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 solution allows for a lightweight and compact display setup that maintains image alignment with the observer's pupil, enhancing the observation experience by eliminating the burden of power-intensive components and ensuring stable image projection.
Implementation Method 1
utilizing a control unit, position detection devices, and a transfer-optical-device control system to accurately position the image on the observer's retina without the need for power-intensive components, using infrared light and optical path synthesizing units to correct image alignment
Data Source
AI summary
A display apparatus of the present disclosure includes an eyepiece optical device and an image display device, the image display device includes an image forming device, a transfer optical device, a control unit, a first position detection device, a second position detection device, and a transfer-optical-device control device, the eyepiece optical device forms an image from the transfer optical device on a retina of an observer, the transfer-optical-device control device controls the transfer optical device such that the image incident from the image forming device reaches the eyepiece optical device under the control of the control unit on the basis of position information of the eyepiece optical device detected by the first position detection device, and the control unit corrects a position detected by the first position detection device on the basis of position information of the eyepiece optical device detected by the second position detection device.