DONGGUAN (BLOOMBERG) – Oppo took the wraps off a foldable smartphone that is more than S$500 cheaper than Samsung Electronics’s Galaxy Fold, launching its maiden attempt to stake out a spot in the nascent category. The Oppo Find N sports a 7.1-inch inner display co-developed with its Korean rival and an exterior 5.5-inch screen. It will start at 7,999 yuan (S$1,720) in China from Dec 23, undercutting the S$2,398 Galaxy Z Fold 3 (Singapore price). Like the latest iPhones, the inner display of the Find N has an adaptable refresh rate, speeding up when necessary and slowing with static images...