The company projects worldwide tablet sales worldwide to touch 229 million units this year, which is a 11 per cent growth over 2013 and represents 9.5 per cent of total worldwide device sales in 2014. In 2013, tablet sales grew 55 per cent.
In tablets, the downward trend stems from the slowdown in basic ultramobiles, new sales of iPads and Android tablets, and the lifetime extension of current tablets to three years by 2018, Gartner said in a statement.
"Some tablet users are not replacing a tablet with a tablet, they are favouring hybrid or two-in-one devices, increasing its share of the ultramobile premium market to 22 per cent in 2014, and 32 per cent by 2018," Gartner Research Director Ranjit Atwal said.
Global shipments of devices -- PCs, tablets, ultramobiles and mobile phones -- for 2014 are estimated to reach 2.4 billion units in 2014, a 3.2 per cent increase from 2013.
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In 2015, Gartner estimates that shipments of Android devices will reach over one billion in emerging markets, driven by sales of lower-cost products.
Apple's new devices, which target the premium market, will continue to help drive iOS volumes. These devices will benefit from a controlled and integrated ecosystem, a focus on the user experience and a leading enterprise tablet position, the research firm added.