Chinese electronics company OPPO has revealed a concept smartphone, called the X 2021, which expands by rolling out its screen on a miniature conveyor belt.
Companies from Samsung to Motorola, Microsoft and Huawei have tried to achieve a similar size-changing effect through the much-hyped novelty of folding screens.
But the OLED screen in the X 2021 simply unfurls like a scroll, growing from 17 centimetres to 18.7 centimetres at the slide of a button.
The tablet-sized screen is designed for gaming and reading ebooks
"Compared with the fixed screen size of a folding screen, the on-the-go adjustment of the rollable screen promises endless possibilities and can even enhance office productivity and entertainment experiences," said OPPO.
"The phone automatically adjusts to full-screen viewing according to the size of the video, providing a more comfortable reading experience that's close to the size of a book and it can display a full, text message pop-up window while playing games without affecting the game screen."
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