Apple and Samsung Electronics are said to be planning to release 12-inch tablets. Apple is currently cooperating with Quanta Computer on the project, while Samsung is developing the product in house, according to sources from the upstream supply chain.

　　In addition to the 12-inch tablet, Quanta has also become a supplier of Apple's iWatch, he sources claimed.

　　Samsung originally hoped to partner with Google for its 12-inch tablet, but has abandoned the idea as Google is currently placing most of its focus on 7-inch products.

　　With Apple and Samsung's entries, the large-size tablet market is expected to see increasing demand, the sources noted.

　　However, the sources are also concerned that large-size tablets may impact notebook demand.

　　Many brand vendors have also developed 18-inch convertible all-in-one PCs, trying to gain the opportunities from the large-size tablet market.