LG Display has started mass production of a new and thinner display, widely speculated to be for use in Apple's next iPhone.
Flat screen maker LG's production schedule of the display remains in line with customers' product release plans, said its chief executive.
"We just began mass production and we don't expect any disruption in supplies," said Han Sang-beom, chief executive of LG Display, a panel supplier for Apple products.
Apple is planning a major product launch on 12 September, stoking speculation that the world's most valuable technology company will announce the sale of its redesigned iPhone.
Apple is equipping the next iPhone with a larger screen after Samsung unveiled its latest Galaxy smartphone with a 4.8in touchscreen.
Sources have said that the panels for the new iPhone will be 4in corner to corner, which is 30 per cent bigger than current iPhones.
The iPhone screens will also be thinner than previous versions with the use of so-called in-cell panels.
The new technology embeds touch sensors into the liquid crystal display, eliminating the touchscreen layer found in current iPhones.
Japan's Sharp also said earlier this month it would start shipping screens destined for a new iPhone in August.