Last week, a small earthquake shook the cosy world of TV manufacturers - an industry often seen as being in lockstep, with similar major advances in technology announced almost simultaneously by market leaders every year.

The latest technology in high-end smart TVs is usually unveiled at the Consumer Electronics Show in Las Vegas each January. However, these are several generations ahead of what is selling in stores. The initial cost of a new machine is high, but falls fast as production volume increases and cost of new components comes down.

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