a flexible display module;

a supporting mechanism comprising a first supporting assembly and a second supporting assembly disposed corresponding to each other, the first supporting assembly and the second supporting assembly configured to slide relatively to provide a supporting surface which changes in area to the flexible display module, and

a limiting mechanism comprising a limiting rotor and a limiting groove, the limiting rotor rotatably connected to the first supporting assembly, the limiting groove defined in the second supporting assembly, wherein the limiting rotor is engaged with the limiting groove when an area of the supporting surface is a predetermined area, the limiting mechanism further comprises a sliding groove provided in the second supporting assembly, and the limiting rotor slides along the sliding groove when the first supporting assembly and the second supporting assembly slide with respect to each other;

the limiting mechanism further comprises a rotation auxiliary member arranged on the second supporting assembly and corresponding to the sliding groove, the sliding groove and the limiting groove are defined in a same end surface of the second supporting assembly and arranged correspondingly to each other, and the limiting rotor is configured to move relative to the rotation auxiliary member according to a predetermined path when in a second state, and abut against the rotation auxiliary member, so as to rotate 90 degrees toward a first direction from the second state to a first state, wherein the limiting rotor is in the first state when the limiting rotor is engaged with the limiting groove; and the limiting rotor is in the second state when the limiting rotor slides along the sliding groove.