Samsung Mobile Display, a joint venture between Samsung Electronics and Samsung SDI, says shortages of its popular AMOLED screens will decrease dramatically when it opens a new plant next July, according to a report by The Wall Street Journal.

Lee Woo-Jong, vice president of marketing for the display business, said in an e-mail Monday, responding to Dow Jones Newswires’ queries, that Samsung is putting “a great deal of effort to move up mass production.”

Lee told the Journal that once the company’s new facility is open, production of AMOLED screens would ramp from current rates of 3 million to 30 million annually.

Both the HTC Evo for Sprint and the Motorola Droid Incredible from Verizon Wireless have been in short supply since their launch, partly because of a shortage in Samsung’s Super AMOLED screens.

HTC went so far as to defer to Super LCD screens, made by Sony, for future versions of the HTC Desire and global versions of the Nexus One, although the Taiwanese OEM told Wireless Week the decision had little to do with a shortage of Samsung’s Super AMOLED screens.

Analysts have suggested that Samsung Display will give priority to providing screens to Samsung’s Galaxy S line of smartphones, a notion that Lee denies. He said that the Galaxy S line gets the same treatment as other customers and the shortages have affected everyone.

Samsung currently supplies a version of the Galaxy S for all of the major carriers in the United States, including AT&T (Captivate), T-Mobile USA (Vibrant), Sprint Nextel (Epic 4G) and Verizon Wireless (Fascinate).