Abstract: A display panel includes two or more gate layers including a plurality of gate patterns extending in a first direction and one or more source-drain layers including a plurality of source-drain patterns extending in a second direction crossing the first direction. The gate patterns of the two or more gate layers are curved or bent along a hole surrounding area corresponding to a periphery of a hole in an active area. The source-drain patterns of the one or more source-drain layers are curved or bent along the hole surrounding area. The gate patterns of at least one of the two or more gate layers overlap the source-drain patterns of at least one of the one or more source-drain layers in a thickness direction of the display panel in the hole surrounding area.

Abstract: In an anticorrosion device of a hydraulic cylinder in which a seal groove partitioned with a plurality of compartments is formed at an inner side of a head cover, with a wiper seal, a rod seal and a buffer seal being disposed in the groove, and a portion between a tube and a rod of a hydraulic cylinder is sealed for thereby preventing the air from inputting from the space into the interior of a tube, there is provided an anticorrosion device of a hydraulic cylinder which comprises a seal member which is mounted on a groove near the space among the compartments and slides along an outer surface of the rod; and a packing ring which is elastically and closely contacted with an outer side of the seal member for sealing the groove.