T-shirts and cars that change color with your mood?
Makes me think of Mood rings which probably work by activating different phosphors by thermoluminescence. If you activate by solar that's photoluminescence or battery, that's electroluminescence. With the new flat batteries available now EL becomes more of a possibility. You will have choices in how you power up your shirt, what colors and when you light up. Would be great when riding your bike at night. Your back could signal your turn, advertise a pizzeria or give your phone number. Endless possibilities.
That's why I will be at Smart Fabrics Wed-Fri next week making pitches and seeing whats new in T-shirts and wearable medical devices, sport performance monitors, wearables for your dog, and sensors. http://www.smartfabricsconference.com/home.aspx
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