A subsidiary of South Koreas Samsung Electronics Co Ltd said on Thursday it received approval to build a $1 billion display module assembly plant in Vietnam, its first production facility in the country. A Samsung Display Co Ltd spokesman said the company plans to start production at the plant, to be built in Bac Ninh province, some time in 2015. Exact production capacity or types of displays to be handled at the facility have yet to be decided, he said. Samsung Electronics has been ramping up its production capacity in Vietnam in a bid to lower production costs, amid intensifying competition in the smartphone market.