Early wearable computers are heavy and inconvenient to wear.Wearable computers replace laptops, PDAs and possibly desktop computers and has the potential to replace or be combined with smartphones like iphones, blackberries.
1991-1994 wearable computers are cumbersome for general use, they have a clunky handband monitor.
Now wearable computers consist of more speed and memory, they also weigh less and power consumption is greatly reduced so that fewer batteries are needed. They are also more fashionable with wraparound sunglasses that includes a VGA display for better resolution.
Unlike smartphones and PDAs, they are able to interact with the environment continuously, obtain and store specific data and recognize data (voice, letters, image) and in turn gives the user useful information. E.g. "Netvigator" an early wearable computer that recognizes voice of the name of the destination and guides user to it, developed by Professor Dan Siewiorek of Carnegie Mellon University in 1991.
Wearable computers fashion show at TED city conference 2001
Reference:
http://discovermagazine.com/1994/feb/awearablecompute340/
http://en.wikipedia.org/wiki/Wearable_computer
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