The design, which has been shortlisted in Fujitsu's 2011 design competition, calls for two solar panels that are able to provide a continuous charge throughout the day.

Toshiba was first to mass-produce laptops. Sharp—which got its name from inventing the mechanical pencil in 1915—pioneered solar cells and LCD screens.

The patent is using solar panels to charge equipments such as notebook, tablet PCs, mobile phones and other handheld devices, with a voltage converter.