From glasses to wristbands and clothing, firms representing a variety of industries began showcasing their wearable electronic devices at a Tokyo trade show that kicked off Wednesday.

Companies, including Google, have in recent years tried to come up with viable optical head-mounted display technology, though none have yet to find proper success.

Still, with 156 firms participating in the annual Wearable Expo at Tokyo Big Sight in Tokyo's Koto Ward, the digital-eyeglass devices were a big draw.