Lenovo says the tablet market needed further innovation
"There have been previous concepts like this - Microsoft toyed with something similar years ago - but it's very different to Lenovo Yoga Book copies handwriting off paper notepads
what else has actually been put on sale," said Patrick Moorhead, from the tech consultancy Moor Insights & Strategy.
"And when you bring out something new there's a risk.
"That's not necessarily bad, because there could be a higher rate of return [if it proves popular] and people recognise Lenovo as a company that brings out differentiated products.
"But if it doesn't deliver, then the spending on all the [research and development] will have been for naught."
Lenovo's share of global tablet shipments rose by about 3% over the past year, according to market research firm IDC.
But it said demand for the firm's products was static, and its improved position was the result of the wider tablet market contracting by 12%