Apple is reportedly testing "larger screens" destined for new iPhone and iPad models, with a 13in iPad potentially on the cards.

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That's according to the Wall Street Journal, which cites "officials at the company's suppliers" in its report that claims Apple has requested prototypes of screens bigger than the iPhone 5's 4in screen, and tablet screens measuring almost 13in diagonally, from its suppliers in Asia. That's a significant increase from the current iPad's 9.7in screen.

See: Bigger iPhone release date, rumours and leaked images

The report highlights that Apple tests various designs for its products before launch, so the company could decide against using the bigger screens in its future products.

Apple CEO Tim Cook has recently said that the company won't be launching a bigger iPhone until building one doesn't require any "trade-offs" in order to accommodate the larger display, so perhaps the purported screen testing is an attempt to eliminate those trade-offs.

WSJ suggests that Apple's tests could hint that the company is trying to cater for the needs of a wider audience. Competitors such as Samsung are known for launching devices in a variety of sizes in order to attract a wide share of the market.

See: Should I buy an iPhone 5 or wait for iPhone 5S, iPhone 6?

WSJ's sources have also said that Apple is preparing to ramp up production of the next generation iPad, dubbed iPad 5, later this month. It's expected to keep the current iPad's 9.7in Retina display, but it'll likely have a thinner, lighter design.

Contradicting reports last week that suggested the next iPhone will enter mass production later this month, WSJ's sources say that the new iPhone production has already begun, with one source claiming that Apple has told its manufacturing partner, Foxconn, to prepare for an August shipping date. 

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