1. A rollable display comprising:a polyhedral drum comprising a plurality of substantially flat surface portions and a plurality of curved surface portions, wherein the plurality of curved surface portions connect adjacent flat surface portions to each other on an outer circumferential surface of the polyhedral drum; and
a flexible panel disposed around the outer circumferential surface of the polyhedral drum,
wherein a top portion and a tail portion of the flexible panel overlap each other on substantially a same flat surface portion of the plurality of substantially flat surface portions of the polyhedral drum, and
wherein the top portion and the tail portion correspond to respective ends of the flexible panel.