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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According to a listing published by the United States Trademark and Patent Office (USPTO), Apple obtained a patent for Vision Pro technology that can relieve neck fatigue. The key is not to reduce weight, but to counter-intuitively increase it.

In the patent, Apple believes that the key to relieving neck fatigue is not to reduce the weight of the Vision Pro headset, but to adjust the center of gravity of the device.

It is learned from Apple’s patent that the components of most current head-mounted displays are concentrated in the front, which will exert downward pressure. Therefore, adding a counterweight to the back of the head-mounted display can move the center of gravity of the entire head-mounted display back, which can alleviate the problem. Neck fatigue.

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According to the patent information published by the U.S. Trademark and Patent Office, this Apple patent mainly introduces the gyroscopic incoming engine of the headset. This means that the engine will process a bunch of motion data and give better haptic feedback in order to provide a better motion experience when playing games or watching movies.

Patently Apple points out that the patent document discusses an engine consisting of torque delivery, which provides better haptic feedback for immersive content. The engine can apply various levels of force to the face from multiple places on the headset, not just vibrations, while the user is immersed in the virtual world.

The patent description reads.

"The gyroscope feed engine can also improve immersive media content for movies and games by providing continuous torque/force on the user's head/neck or other body parts in sync with the visual content, such as creating the sensation of air wave pressure (e.g., from an explosion scene), creating the sensation of centrifugal force (e.g., a bumpy roller coaster or race car), head/neck/hand/wrist exercise (e.g., providing counter-torque to the user's motion) , Ergo correction (e.g., informing or guiding the user to fix poor sitting or standing posture), and providing reaction force feedback in VR applications (e.g., punching an object and feeling the reaction force on the hand/wrist)."

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