South Korea's LG Display Co Ltd said on Tuesday its fourth-quarter operating profit nearly doubled from a year earlier to its quarterly record due to a pickup in panel prices. The world's biggest liquid crystal display (LDC) maker said the all-time high profit was caused by the upward trend of panel prices and a favorable foreign exchange rate. "The upwards trend of panel prices is anticipated to continue thanks to the low inventory level in the industry and the trends towards large-size panels," Chief Financial Officer Don Kim said in a statement.