Oppo's expanding phone can grow and shrink on demand

A smartphone with an expanding display that can grow and shrink on demand has been demonstrated by Chinese phone-maker Oppo.

The device has a flexible display that rolls up inside the device, letting the screen expand from 6.7in (17cm) to 7.4in (18.8cm).

BBC Click's Chris Fox went hands-on with the concept phone to see what it was like.

See more at Click's website and @BBCClick