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Amazon has bought Liquavista, a company that makes 'electrowetting' colour displays.
Start-ups backed by the National Science Foundation will be showing off a wide range of technologies, including virtual reality contact lenses, robot butlers, and flexible displays.
Researchers say new tech can generate more than enough electricity to power a light bulb and charge a laptop, all from a walk around town.
Liquavista's full-color e-reader appears to be aimed squarely at magazine and newspaper reading.
One of the world's largest trade shows for mobile services and devices, the 3GSM World Congress in Barcelona aims to showcase the cutting edge of the wireless industry.
French company Varioptic sells mobile phone camera modules whose lenses focus using oil, water, and electrical voltage.
Mobile phone screen technology in development can keep displays running all day, thanks to the sun and water. Photos: 3D screens
The latest in the new-screen industry: a fluid-filled sac where oil and water duke it out.