CHIBA, Japan -- The 3D television set. A solar city. The solar phone. These products and more were on display at this year's Ceatec, Japan's version of the Consumer Electronics Show.

Japan has been a major producer and consumer of solar panels and energy efficiency technologies since the oil shocks of the early 1970s. Many manufacturers now want to expand on the country's export potential.

That said, here are some of the energy-efficient products and technologies on display at this year's show. 

The Mitsubishi MiEV, the all-electric car that was released earlier this year. It's part of a zero-energy home display. One of the more interesting ideas from Panasonic and Sharp are homes that can run at least partly on DC power. A full DC house could improve energy efficiency by around 10 percent.

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Tags: ceatec, energy efficiency, japan, miev, mitsubishi, ntt docomo, oled, panasonic, sharp, solar city, sony, trade shows, tvs