Wrist-Mounted Smartphone with 15 cm Floating Aerial Display Explore our case study on a wrist-mounted smartphone with a 15 cm floating aerial display, featuring 5G connectivity, gesture controls, LiDAR sensors, Android AOSP integration, and advanced wearable hardware design.

Wrist-Mounted Smartphone with 15 cm Floating Aerial Display

We developed a wrist-mounted smartphone prototype with a 15 cm floating interactive aerial display. Powered by ARM hardware, 5G connectivity, LiDAR gesture controls, and custom Android AOSP, the device delivers flagship smartphone performance in a compact wearable form factor.

This project involves the design and development of a compact smartphone designed for mounting on the wrist, capable of projecting a 15-centimeter floating interactive aerial display above the surface of the device.

The aim was to create a fully functional prototype that performs like a modern flagship smartphone, using a form factor that is compact enough to be worn by an individual and complies with international safety regulations and guidelines.

Wrist-Mounted Smartphone with 15 cm Floating Aerial Display

Hardware Architecture

To achieve this goal, the hardware architecture of the device incorporated a highly capable ARM-based system-on-chip (SoC) along with 8 gigabytes (GB) of random access memory (RAM) and 128 gigabytes (GB) of non-volatile storage (e.g., Flash) to ensure that applications perform as smoothly as possible.

The connectivity stack is comprised of 5G/LTE connectivity (with embedded eSIM), W-Fi 6, Bluetooth 5.3, GPS and GLONASS, allowing the wearable device to operate as a fully functional smartphone platform.

Aerial Display System

At the center of the innovation is a floating display engine that combines a Micro-Mirror Array Plate (MMAP/DCRA) with a Z-path folding optical system. This setup creates a high-definition view of an image displayed exactly 15 cm from the device. It maintains a maximum chassis thickness of 4 cm without losing image quality.

Sensors and Interaction

To facilitate mid-air interaction, LiDAR/ToF sensors allow for detecting hand/gesture and spatial touch input, as well as providing a user interface with built-in high resolution front, rear and macro cameras, an LED flash, 2 microphones, 2 micro speakers and multiple embedded environmental sensors (accelerometer, gyroscope, magnetometer, ambient light sensor and barometer).

Software and System Integration

The system is built on the custom Android AOSP OS (operating system) and has been enhanced to work with ARM (Advanced RISC Machine) hardware (hardware and software configuration).

All drivers (for the LiDAR/ToF sensors, camera modules, and aerial optical interface) that allow for ground truth calibration of the floating display plane to the spatial coordinate system of the LiDAR data were created via a cross-platform operating system and software with respect to the spatial calibration, the spatial reference will be an accurate representation of the 3D position for mid-air gesture detection based on touch.

Final Outcome

The project concluded with the delivery of full PCB designs, CAD files, Android source code, calibration software, and detailed documentation to support manufacturing and certification.

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