Because the distance between the dam glue 50 and the cutting region is relatively large in the second frame region, for example, in order to make the cover plate alignment mark 14 have a relatively large size without increasing the size of the frame region, at least another one of the plurality of cover plate alignment marks 14 (taking the cover plate alignment marks 142 and 143 as an example in FIG. 1A) is located in the second frame region and between the dam glue 50 and the cutting region. In this case, in at least one embodiment, the whole encapsulation layer EPL2 does not exceed the dam glue 50, and as illustrated in FIG. 1E, the cover plate alignment mark 14 (for example, at least one of the cover plate alignment marks 142 and 143 in FIG. 1A) located in the second frame region and between the dam glue 50 and the cutting region is overlapped with the pixel defining layer PDL and is located on a side of the pixel defining layer PDL away from the base substrate 11, that is, at least one of the cover plate alignment marks 14 located between the dam glue 50 and the cutting region is not overlapped with the second inorganic encapsulation layer EPL2 in the direction perpendicular to the base substrate 11.
