Sony has introduced an Ultra HD television with a 55-inch screen priced at $4,999. That compares with the $24,999 price tag for an 84-inch model unveiled this year, this article notes. Ultra HD is also known as 4K TV for its higher resolution than existing HDTVs. The company is also bringing out a $699 media player for 4K movies and a download service for movies in 4K format.
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