Movable Sensor on Head-Mounted Display Track for Eye-Tracking
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Solution Overview
Problem
In head-mounted display devices for virtual and augmented reality, the close proximity of sensors to the user's head limits the view angle and orientation for accurate eye-tracking, often resulting in obscured views and ineffective eye movement detection.
Innovation Solution
A head-mounted display device with a movable sensor and a control method that uses a track on the frame to adjust the sensor's position based on control signals generated by a controller, ensuring the sensor can capture a clear target image even when the path is initially blocked.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the sensor is placed close to the user's head to reduce device size and improve optical lens compatibility, then the device size and optical compatibility are improved, but the view angle and orientation for detecting eye movement deteriorate
Solution Approach 1:
The sensor is made movable along a track rather than fixed, allowing it to dynamically adjust its position and orientation. This enables the sensor to move to optimal positions for capturing eye movement while maintaining close proximity to the user's head, thus resolving the contradiction between device size and detection accuracy.
Solution Approach 2:
The sensor movement is constrained to a one-dimensional track, adding a degree of freedom in position adjustment without increasing overall device volume. This allows the sensor to explore different capture positions along the track to optimize view angle while maintaining compact device dimensions.
2Ease of operation
If the sensor is placed between the user's head and the optical lens to facilitate eye movement observation, then the ease of observing eye movement is improved, but the view angle and orientation for detecting eye movement deteriorate
Solution Approach 1:
The sensor can dynamically move along the track to positions that provide optimal view angles for observing eye movement through the optical lens. This dynamic positioning allows the sensor to maintain both ease of observation and detection accuracy by selecting the best capture position along the track.
Solution Approach 2:
The controller receives feedback from the sensor about the captured images and adjusts the sensor position along the track accordingly. This feedback mechanism ensures that the sensor continuously maintains optimal positioning for accurate eye movement detection while facilitating easy observation through the optical lens.
3Device complexity
If the sensor position is fixed to simplify device structure, then the device complexity is reduced, but the ability to capture clear target images when path is blocked deteriorates
Solution Approach 1:
The sensor is designed to move dynamically along a track rather than remaining fixed, adding minimal complexity while significantly improving image capture reliability. When the initial capture path is blocked, the sensor can move to alternative positions along the track to achieve clear images.
Solution Approach 2:
The controller monitors the quality of captured images and provides feedback to adjust the sensor position along the track. This feedback mechanism ensures reliable image capture by automatically positioning the sensor to avoid blocked paths while maintaining acceptable device structure complexity.
Data Source
AI summary
A head-mounted display device and a control method for an eye-tracking operation are provided. The head-mounted display device includes a frame, a track, a sensor and a controller. The track is disposed on a peripheral region of the frame. The sensor is disposed on the track, and is configured to capture a target image of a target area. The controller is coupled to the sensor, is configured to generate a control signal according to the target image, and adjust a position of the sensor on the peripheral region by moving the sensor according to the control signal.