According to a technology patent published by the United States Trademark and Patent Office (USPTO), Apple obtained a technology patent applicable to the Vision Pro head display and future AR glasses, which combines cameras and self-mixing interference. Measurement (SMI) sensors to build the next generation of eye tracking systems.
Note: Traditional eye monitoring technology is based on cameras or videos, relying on active illumination of the eyes, eye image collection, and extraction of eye characteristics such as pupil center and corneal flicker.
This type of eye-tracking monitoring technology has challenges such as power consumption, form factor, computing cost and latency, which affects the weight, battery life and functionality of the head-mounted display device.
Apple’s patent describes systems, devices, methods and devices for tracking eye movements using one or more SMI sensors. In some embodiments, the SMI sensor can be used alone or in combination with a camera to determine gaze vector or eye position.
The eye tracking device may include a head mounted frame, an optical sensor subsystem mounted to the head mounted frame, and a processor. An optical sensor subsystem can include a set of one or more SMI sensors.
The processor is configured to operate the optical sensor subsystem to cause the SMI sensor to emit a set of one or more light beams toward the user’s eyes and to track eye movement by receiving SMI signals.
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