Asymmetric Sensor Placement for Head-Mounted Display Eye Tracking
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Solution Overview
Problem
Existing head-mounted display devices face challenges in accurately tracking eye movements due to environmental factors like glasses, occlusion, and external light, which reduce image clarity and user experience.
Innovation Solution
The device employs two sensors positioned asymmetrically on the main body with different image capture angles to capture eye information, allowing for complementary image processing and weight calculation to enhance tracking accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor is set in a specific position (bottom or side) of the head-mounted display device, then the device structure is simple, but the image information obtained from the user's eyes is not clear enough due to environmental factors such as glasses, occlusion, reflection, and external light exposure
Solution Approach 1:
The patent divides the single sensor function into multiple sensors positioned at different locations (first sensor at first setting area, second sensor at second setting area). Each sensor captures eye images from different angles, segmenting the observation task to overcome limitations of any single position regarding glasses, occlusion, reflection, and external light.
Solution Approach 2:
The patent employs asymmetric positioning of sensors with different angles relative to the horizontal axis (first angle for first sensor, second angle for second sensor, where first angle ≠ second angle). This asymmetric configuration allows each sensor to capture eye images from distinct perspectives, improving the ability to obtain clear image information under various environmental conditions while maintaining a relatively simple device structure.
2Reliability
If a single sensor is used to capture eye images, then the device complexity is low, but the accuracy of eye tracking is reduced due to environmental factors
Solution Approach 1:
The patent segments the eye tracking function by deploying multiple sensors at different setting areas with different capture angles. This segmentation ensures that at least one sensor can reliably capture eye images even when environmental factors (glasses, occlusion, reflection, external light) interfere with others, thereby improving overall eye tracking reliability.
Solution Approach 2:
The patent changes the parameter of sensor positioning angles (first angle ≠ second angle) to optimize the capture of eye images from multiple perspectives. This parameter variation allows the system to adapt to different environmental conditions and maintains reliable eye tracking performance without requiring an excessive number of sensors.
Data Source
AI summary
A head-mounted display device includes a main body, a first sensor and a second sensor. The first sensor is disposed on a first setting area of the main body. The second sensor is disposed on a second setting area of the main body. The first setting area and the second setting area respectively have a first central point and a second central point, where the first central point and the second central point are disposed on a horizontal axis. There is a first angle between a connection line of the first central point and the first sensor with the horizontal axis, and there is a second angle between a connection line of the second central point and the second sensor with the horizontal axis, where the first angle is different from the second angle.