Smart Glasses Get an Upgrade With TDK’s Custom-Built, Motion-Tracking IMU
The SmartMotion ICM-45685 sensing solution is designed for high-precision, ultra-low power motion tracking and on-chip image stabilization for AI and augmented reality-enabled smart glasses and eyewear.
TDK Corporation has released SmartMotion, a custom inertial measurement unit (IMU) designed specifically for augmented reality (AR) and AI-driven wearables. The new six-axis ICM-45685 sensor is a low-power component that integrates a range of features aimed at improving user experience and functionalities in smart glasses and wearables.
SmartMotion for Smart Glasses
At the core of TDK’s SmartMotion for smart glasses solution is the ability to perform high-precision, context-aware motion tracking. It features a gyro-assisted fusion (GAF) algorithm that runs on-chip, providing highly accurate head orientation data. This is a critical feature for AR applications where virtual objects need to remain stable and anchored to the real world, regardless of head movement. The solution’s on-chip processing reduces the computational load on the main system processor, which in turn can lead to lower power consumption and extended battery life, a primary concern for wearable devices.
TDK’s ICM-45685 sensor can detect head orientation, activity, and other features that enable augmented reality in smart glasses. Image used courtesy of TDK Corporation
Beyond motion tracking, the SmartMotion IMU offers on-chip optical and electronic image stabilization for camera modules. This feature is significant for smart glasses with integrated cameras, as it helps to reduce blur and shake in images and video, providing a cleaner, more stable visual feed for both the user and any connected applications.
Advanced Motion Tracking
The sensor’s design incorporates TDK’s BalancedGyro technology, which is intended to provide excellent vibration rejection. In a device like smart glasses, which is subject to constant minor movements and vibrations from walking, talking, and other activities, this feature helps to maintain the accuracy and stability of the motion tracking data.
The sensor’s architecture allows for multiple algorithms to run simultaneously on the chip, including head orientation tracking, image stabilization, and activity/inactivity tracking. Future planned features include donning/doffing detection and voice vibration detection.
The SmartMotion system utilizes optical and electronic image stabilization to provide a stable visual feed. Image used courtesy of Adobe Stock
By integrating these features on a single chip, TDK aims to simplify the system design for engineers. By offloading complex sensor fusion and processing tasks to a dedicated, purpose-built component, designers can reduce the size of the system, decrease power consumption, and potentially lower the overall bill of materials. TDK presents its solution as a complete sensing package for developers working on the next generation of wearable computing.
Advancing Smart Glasses and Eyewear
TDK’s new SmartMotion solution is a custom IMU that brings on-chip sensor fusion, high-precision motion tracking, and image stabilization to the smart glasses and AR market. It is engineered to address the core challenges of power consumption and size in wearable technology. The technology applies to a variety of devices, from AI-powered smart glasses and extended reality headsets to specialized fitness and sports eyewear.
