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THE fu­ture of 3D tele­vi­sion was a hot topic at CES this year, with only 1.1 mil­lion US con­sumers buy­ing the new technology last year.

While Sam­sung has com­mit­ted to ‘‘ a big in­vest­ment in 3D TV’’ and LG in­tro­duced 3D TV with pas­sive, bat­tery-free glasses, oth­ers showed off technology viewed with the naked eye.

Sony un­veiled three glasses-free 3D pro­to­type tech­nolo­gies at CES.

These in­cluded a 24.5-inch OLED model, a 46-inch LCD screen and a 56-inch screen with a 4000x2000 res­o­lu­tion. All had ‘‘ sweet spots’’ in which 3D looked best, and the lat­ter ben­e­fited from the greater res­o­lu­tion.

Even more con­vinc­ing was Sony’s smaller, glass­es­free 3D pro­to­types: a por­ta­ble 3D Blu-ray Player with a 10-inch screen and a per­sonal 3D TV viewer called the Head­man, which looks like a pair of fu­tur­is­tic sun­glasses.

There is no de­liv­ery date on the new prod­ucts and Sony will have plenty of com­pe­ti­tion.

Toshiba also showed off an au­tostereo­scopic 3D TV and Sharp its 3D smart­phone, which uses par­al­lax bar­rier technology to de­liver 3D. Jen­nifer Dud­ley-Ni­chol­son went to Las Ve­gas as a guest of In­tel.

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