When video game makers fix prices for consumers, it's considered the normal state of business. When LCD makers fix prices for game makers, they get raided by the Japanese Fair Trade Commission. So it goes.
AFP has the report on the investigation on screen-makers Sharp and Hitachi, which have long been suspected of organizing a bid-rigging cartel to limit price competition for portable screens. Between them, the two companies provide all the LCD screens used in the Nintendo DS, though Nintendo couldn't confirm that they were the ones that complained to the commission. No one else involved, included the commission itself, had much comment on the actual investigation, but if it bears any fruit you'll be sure to read about it here.