Display panel and display device

The display panel comprises a plurality of sub-pixel units (2) arranged on a first substrate (1), the sub-pixel units (2) comprise first sub-pixel units (2a) and second sub-pixel units (2b), and the size of an opening area (K2) of each first sub-pixel unit (2a) in the first direction is larger than that of an opening area (K2) of each second sub-pixel unit (2b) in the first direction; at least one sub-pixel unit (2) comprises a first electrode (21) arranged on the first substrate (1), the first electrode (21) is provided with at least one slit (22) extending in the first direction, and the orthographic projection of the slit (22) on the first substrate (1) is located in the range of the orthographic projection of the opening area (K2) of the sub-pixel unit (2) on the first substrate (1); wherein the size of the slit (22) in the first sub-pixel unit (2a) along the second direction is smaller than the size of the slit (22) in the second sub-pixel unit (2b) along the second direction, and the second direction in