SEOUL, Aug 17 (Reuters) - LG Display Co Ltd (034220.KS) said on Tuesday it plans to invest 3.3 trillion won ($2.8 billion) in small- to mid-sized organic light-emitting diode (OLED) panel production facilities. The investment will take place starting this month until March 2024, the display panel maker said in a regulatory filing. The investment will be in South Korea for sixth-generation OLED panels, and the facility is expected to begin operations in 2024, a spokesperson said, without elaborating. Analysts said LG Display"s strategy of efficient OLED production expansion by achieving economies of scale added to its better-than-expected operating profit in the second quarter to 701 billion won ($607 million). read more ($1 = 1,164.8800 won)