OnePlus is expected to display its Concept One prototype smartphone at the Consumer Electronics Show (CES) in Las Vegas next week. At this point there are no plans to put the Concept One into production, instead, the device is meant to showcase OnePlus innovation in mobile device tech.

Ahead of the show the company has already posted a teaser video on Twitter, showing an 'invisible' rear camera that can be hidden under the glass rear panel. According to OnePlus 'color-shifting glass technology' is used to achieve the effect.

The team at Wired already had the chance to have a closer look at the technology and reports OnePlus is using the same technology found in sunroofs to control the transparency of the glass panel. When inactive the camera is hidden under tinted glass. When the camera is in use, the tint can be adjusted via an electrical signal and the camera and lenses become visible behind the panel.