Apple Tuesday was awarded a patent for a MacBook that would be powered with solar cells (photovoltaics), meaning your laptop could be powered or at least recharged through light.

The patent, titled “Electronic device display module” describes a two-sided display for the lid of a portable computer, such as Apple’s MacBook. The front of the lid facing the user would still sport the typical display screen but the rear would serve as more than just a cover.

The patent describes a rear plate made of “electrochromic glass” also known as “ smart glass” or “switchable glass.”

”Electrochromic glass, which is sometimes referred to as electrically switchable glass, may receive control signals (e.g., voltage control signals) from control circuitry,” the patent submission states. “The control signals can be used to place electrochromic glass in either a transparent (light-passing) state or a translucent (light-blocking) state.”