A woman uses her iPhone March 1, 2012 in Washington,...

A woman uses her iPhone March 1, 2012 in Washington, DC. Credit: Getty Images

Sales of the iPhone, first introduced in 2007 with the touch screen template now adopted by its rivals, account for around half Apple's total sales.

Its major display suppliers LG Display and Samsung Electronics Co declined to comment.

The high-definition "retina" display--containing several times as many pixels within the same area-- is used in the latest iPad released earlier this month.

The latest iPhone 4S was introduced in October last year.

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