VOICE TWO:

An active glasses system requires electronic glasses that are wirelessly connected to the television. A signal from the TV tells each side of the glasses when to turn on and off, showing each eye slightly different images that create the sense of depth. The switching happens so fast that the images appear continuous.

Active eyeglasses cost more -- about one hundred dollars each. But the technology for such receivers is not too different from current flat screen TVs.

There were examples of both technologies at the twenty-ten International CES. There were even 3-D TVs that require no glasses at all. But 3-D TVs are expected to cost a lot – with one selling for several thousand dollars. Still, the Consumer Electronics Association predicts that more than four million 3-D TV sets will be sold this year.

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A Samsung e-reader on display at CESVOICE ONE:

Digital tablets and eBook readers could also be popular this year. These easy-to-hold devices let you read and watch media or search the Internet and order products. Dell and Hewlett-Packard exhibited new tablet devices at CES.

Lenovo demonstrated a product that can be used as two computing devices. The IdeaPad U-One Hybrid is a notebook computer, which has a removable screen that becomes a digital tablet. Amazon showed versions of its popular Kindle eBook reader. Barnes & Noble, Samsung, Sony and other companies also showed models of eBook readers.