Abstract: A perovskite solar cell includes an electron-transport layer (ETL), a perovskite layer, and an HTL. The ETL is with an additive phase buried therein and disposed over a substrate with a bottom electrode. The perovskite layer is disposed above the ETL and is in contact with the ETL. The perovskite layer includes a plurality of grains which arranged on a top surface of the ETL along a direction, in which two of the adjacent grains have adjacent side surfaces to form a void there between over the top surface of the ETL. The top of the void defines a GBG side-angle with the direction, in which a mean GBG side-angle of the perovskite layer is in a range from 5 degrees to 30 degrees. A HTL is disposed over the perovskite layer and between a top electrode and the perovskite layer.

Abstract: Disclosed are a foldable screen and a display device. The foldable screen includes: a flexible display panel and a plurality of elastic portions, wherein each of the elastic portions includes each of elastic support members and two connecting rods fixedly connected to each of the elastic support members; wherein the two connecting rods are respectively connected to two flat portions of the flexible display panel, and the elastic support members are configured to supply a support force to the foldable portion in the case that a display surface of the foldable portion of the flexible display panel is coplanar with those of the flat portions.

Abstract: The present disclosure provides a driving circuit for an array substrate, an array substrate, a display panel, and a display device. The driving circuit comprises a plurality of driving signal lines, which are insulated from each other and are used for driving a display region of the array substrate; and at least one driving circuit protection line insulated from the plurality of driving signal lines, wherein a voltage of the driving circuit protection line is smaller than that of each of the plurality of driving signal lines.

Abstract: The present disclosure provides a driving circuit for an array substrate, an array substrate, a display panel, and a display device. The driving circuit comprises a plurality of driving signal lines, which are insulated from each other and are used for driving a display region of the array substrate; and at least one driving circuit protection line insulated from the plurality of driving signal lines, wherein a voltage of the driving circuit protection line is smaller than that of each of the plurality of driving signal lines.