Suppliers to Apple are scrambling to get enough screens ready for the new iPhone 6 smartphone as the need to redesign a key component has disrupted panel production ahead of next month’s expected launch, supply chain sources said.

It is unclear whether the hiccup could delay the launch or limit the number of phones initially available to consumers, as Apple readies larger-screen iPhones for the year-end shopping season amid market share loss to cheaper rivals.

But the issue highlights the risks and challenges that suppliers face to meet Apple’s tough specifications, and comes on the heels of a separate screen technology problem, since resolved, in making thinner screens for the larger iPhone 6 model.

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