AR Gaze Detection With Polarization Filtering for External Light Noise
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Solution Overview
Problem
Existing augmented reality (AR) devices face accuracy issues in gaze detection due to external light noise, which interferes with the camera's ability to track the user's gaze effectively.
Innovation Solution
The AR device incorporates a waveguide with a support part, a light receiver, a first polarization plate to polarize noise light, and a second polarization plate to block polarized noise light from reaching the light receiver, enhancing gaze detection accuracy by filtering out external light noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a camera is placed on the temple of glasses to track user gaze, then gaze tracking capability is enabled, but external light acts as noise and deteriorates detection accuracy
Solution Approach 1:
A polarization plate is introduced as an intermediary component between the external light source and the camera. This polarization plate selectively blocks polarized noise light from reaching the camera while allowing the detection of light reflected from the user's eyeball, thus resolving the contradiction between enabling gaze tracking and maintaining detection accuracy in the presence of external light
Solution Approach 2:
The solution applies polarization filtering specifically to the noise light path rather than blocking all external light uniformly. By using a polarization plate oriented to block horizontally polarized noise light while allowing vertically polarized reflected light from the eyeball to pass through, the system maintains local quality differentiation between signal and noise paths, enabling accurate gaze detection despite external light presence
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 improves the accuracy of gaze detection by effectively blocking noise light, allowing the AR device to reliably track user gaze and enhance the overall performance of the AR experience.
Implementation Method 1
a first polarization plate configured to polarize noise light traveling toward the light receiver
Implementation Method 2
a second polarization plate configured to block the polarized noise light from the first polarization plate from reaching the light receiver
Data Source
AI summary
Provided are an augmented reality (AR) device and method for detecting a gaze of a user. The AR device may include a waveguide, a support part configured to fix the AR device to a face of the user of the AR device, a light receiver provided on the support part, a first polarization plate and a second polarization plate configured to linearly polarize transmitted light, and at least one processor configured to obtain gaze information of a user, based on light reflected from an eyeball of the user and obtained via the light receiver, wherein noise light traveling toward the light receiver is linearly polarized in a first direction by the first polarization plate, and light linearly polarized from the noise light is blocked by the second polarization plate.