"We understand that the yields on the display have been low and that they're creating a production bottleneck," Andrew Rassweiler from research and advisory analysts iSuppli told Bloomberg News.
"That they have been doing it for the iPhone for some time is great, but once you go to 9.7in, it is a much more complicated process."
The 9.7in screen is produced by South Korea's LG Display and Samsung Electronics and by Japan's Seiko Epson, according to iSuppli.
Both Apple and Samsung declined to comment, while LG and Seiko didn't respond to requests for comment Bloomberg said.
Apple's iPad won't be available until an unspecified date next month in the UK, Canada, Australia, France, Germany, Italy, Japan, Spain and Switzerland.