In recent years, however, Sony's lead in the TV business has been eroded by low-cost manufacturers such as Irvine-based Vizio Inc. as well as high-end South Korean companies such as Samsung. As a result, Sony's TV business saw a 43% drop in revenue to just more than $3 billion in the crucial Christmas quarter, contributing to a $2-billion overall loss for the company in the three months ended Dec. 31. Sony's electronics business accounted for more than 71% of its revenue in the period between April 1 and Dec. 31, 2011.