Prolonged sluggish demand in the liquid crystal display (LCD) industry has slowed South Korean flat panel makers\' construction of plants in China, industry sources said Wednesday, suggesting that China\'s adoption of the latest LCD technology could be delayed.In May, Samsung Electronics started work on its new LCD plant in Suzhou on China\'s east coast. LG Display Co., its smaller home turf rival, had planned to build a new factory in the southern city of Guangzhou.