MidAir Touch Display

Emerging Technologies

 

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MidAir Touch Display


The key technology for generation of tactile feedback is phased arrays of ultrasound transducers. By controlling phase shift and output amplitude of each transducer, researchers can design the resulting ultrasonic field. The acoustic energy distribution exerts pressure on the surface of the human body, which enables remote and non-contact tactile stimulation. The field can be foci-formed from planer phased arrays, a standing wave from pairs of phased arrays facing each other, and even a free 3D shape of energy distribution. Properly designed ultrasonic fields generate various touchable textures. A vibrotactile spot with 1 kHz bandwidth ranging from DC (0Hz) can be generated by amplitude modulation of the ultrasonic field, and standing waves yield static elastic textures.

Aerial images are created with an optic component named Aerial Imaging Plate (AIP) invented by ASUKANET Corporation. The AIP is composed of tiny corner mirrors arrayed in a planar lattice, which creates three-dimensional midair images of objects placed behind the AIP. The generated image can be seen from arbitrary viewpoints. For planar midair images, the original source images should be planar LCDs. For generating volumetric midair images, the corresponding image source should also be volumetric. Finger and hand motion is captured with commercially available motion and infrared sensors.

MidAir Touch Display integrates all these technologies to provide visuo-tactile interaction with bare hands.

Keisuke Hasegawa
The University of Tokyo

Yasuaki Monnai
Keio University

Seki Inoue
The University of Tokyo

Yoshikazu Furuyama
The University of Tokyo

Yasutoshi Makino
The University of Tokyo

Hiroyuki Shinoda
The University of Tokyo