A display includes: a first support member (FSM); a second support member (SSM); joint units (JUs) arranged in a first direction (FD), extending in a second direction (SD), and between the FSM and the SSM; and a flexible display module on the FSM, the SSM, and the JUs. Each JU includes: a body part (BP) extending in the SD; and protruding parts (PP) on opposing sides of the BP, each PP having a fan shape (FS) and being on an upper end of the BP. Each PP includes: an arced curved surface (CS), and a first inclined surface (FIS) and a second inclined surface (SIS) defined as radii of the FS. An angle between the FIS and a third direction (TD) is equivalent to an angle formed between the SIS and the TD. The CSs of some PP on a same upper end of the BP face each other.