Apple looking to supersize the iPad with 13-inch model?

Apple and its component suppliers are tinkering with larger displays for both the iPad and iPhone, according to reports.

The next device rumoured to be joining Apple's lineup will be a supersized iPad, according to reports.

According to the Wall Street Journal, Apple and its component suppliers in Asia are now testing larger iPad and iPhone screens.

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The companies are looking into a 13-inch screen for the iPad, which is almost a quarter larger than the current largest iPad display of 9.7 inches, and around 40 percent bigger than the iPad mini's 7.9-inch screen.

The iPhone too could be getting larger: according to the Wall Street Journal, Apple has asked for prototype screens that are "larger than four inches".

The paper doesn't say how much larger the screens could be, however, though the flagship devices from Apple's rivals are all larger than its current-generation iPhone: the Nokia Lumia 1020 comes with a 4.5-inch display, for example, while the Samsung Galaxy S4 nudges phablet territory with a five-inch screen. The iPhone 5 has a four-inch display.

The paper notes there's no word yet on whether the larger iPhone or iPad will make it into production.

However, reports last week suggested that the larger iPhone display in question could be 4.3 inches , and arrive on the iPhone 5S, the expected next generation of iPhone. According to Bloomberg, Apple has delayed the launch of the 5S in order to include the larger display.

Other additions to the Apple stable appear to have also got the go-ahead: as well as a refresh to the current iPhone slated to ship in late August and go on sale at the end of the year, the company is expected to introduce a lower-end iPhone with a smaller screen, aluminium body and various colours of outer casing, the WSJ says.