A patent application published this week has shown another use of a dual-screen, with Microsoft describing using dual screen devices for dawn simulation.
The patent [PDF], Mobile smart device with integrated dawn simulation, was filed by the Redmond giant on 29 December 2017.
As summarised in the patent application, the technology is generally directed to mobile clock devices.
"In one example of the technology, a device includes a first screen, a second screen, and a controller," Microsoft wrote. "The second screen is physically coupled to the first screen, and is facing a different direction than the first screen."
The controller is configured to cause the first screen to operate as a clock display.
"The controller is further configured to cause the second screen to provide indirect light such that the indirect light gradually increases beginning at a time proximate to a predetermined time until the predetermined time is reached," the patent continues.
The patent doesn't claim ownership over dual-screen or dawn simulation -- a technique that involves timing lights, often alongside sunrise.
It does however claim ownership of: "An apparatus, comprising a device including a first screen and a second screen that is physically coupled to the first screen, and is facing a different direction that the first screen and a controller that is configured to cause the first screen to operate as a clock display, and further configured to cause the second screen to provide dawn simulation, including providing lighting that increases from a time proximate and prior to a predetermined time to the predetermined time."