Van Houten attributed that to the company's strategy of tailoring its product offerings to individual markets.
Van Houten was released for six months after her conviction was overturned, but was reconvicted.
Van Houten was accused of stabbing Rosemary LaBianca 14 to 16 times in the back.
Van Houten was also convicted of conspiracy in Tate's death and four others at the actress' Beverly Hills home.
"We see another opportunity for a billion-euro improvement... by making products that are more competitive, " Mr van Houten told the BBC.
Mr van Houten said that hospital chief executives in the US are currently being very careful with capital spending due to regulatory reforms.
Manson and three of his followers, Leslie Van Houten, Patricia Krenwinkel and Charles "Tex" Watson, remain in prison for life in the Tate killings.
"Look at his two co-defendants right now who are still alive, " he said of Patricia Krenwinkel and Leslie Van Houten, who are still imprisoned on life sentences.
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Van Houten, who was 19 at the time of the killings, was convicted in the murders of Leno LaBianca, a wealthy grocery store owner, and his wife, Rosemary.
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"We reiterate our view of a slow first half to 2013, due to adverse market trends, especially in Europe and the U.S., " said Chief Executive Frans van Houten in a statement.
Manson and those convicted along with him in the murders -- Atkins, Patricia Krenwinkel, Leslie Van Houten and Charles "Tex" Watson -- have been in California prisons for more than three decades.
"With this transaction we are taking another step in reshaping the Consumer Lifestyle portfolio and transforming Philips into the leading technology company in Health and Well-being, " said Philips Chief Executive Officer Frans van Houten.
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However, chief executive Frans van Houten said he expected sales to remain subdued in the first half of this year, because of the "challenging market" in the US and Europe, which account for well over half of Philips' revenues.
Manson and four others -- Susan Atkins, Patricia Krenwinkel, Charles "Tex" Watson and Leslie Van Houten -- were convicted of murder and other charges in connection with a two-night rampage that left pregnant actress Sharon Tate and seven others dead.
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