For example, at least one of the first frame region and the second frame region is provided with the cover plate alignment mark 14. In the embodiments of the present disclosure, because the second frame region is located on a side of the display panel where the flexible circuit board 40 is arranged, the second frame region has a larger width (i.e., the size along the first direction X), so that the signal lines extending from the display region directly enter the second frame region to be electrically connected with the flexible circuit board 40, and it is convenient for the signal lines led out from the third frame region and the fourth frame region to be electrically connected with the flexible circuit board 40 at the second frame region. Furthermore, the first frame region opposite to the second frame region also has a larger width (i.e., the size along the first direction x), so that the signal lines extending from the display region first enter the first frame region, and then enter the second frame region after passing through the third frame region or the fourth frame region to be electrically connected with the flexible circuit board 40. In the embodiments of the present disclosure, because the cover plate alignment mark 14 is provided in at least one of the first frame region and the second frame region with a larger width, the cover plate alignment mark 14 may have a larger size to improve the identifiability of the cover plate alignment mark 14, thereby improving the alignment accuracy.