Sony Corp., struggling to rebound from seven consecutive annual losses in television manufacturing, has reorganized the business into three groups.

One group will oversee liquid-crystal-display operations, another will coordinate contract manufacturing and a third will oversee the development of next-generation sets, spokeswoman Ayano Iguchi said. The changes took effect Tuesday, one day before the company was to announce its earnings.

Sony, which sells products ranging from PlayStation game consoles to life insurance, is struggling to compete against Samsung Electronics Co. and low-cost TV set maker Vizio Inc. in an industry where sales have flattened in developed countries.