Foldable flexible display device

A foldable flexible display device comprising:

• first and second plates each having a predetermined area;
• and
• a hinge member for connecting the first plate and the second plate;
• wherein the hinge member has a curvature on folding of the first plate and the second plate together,
• wherein the hinge member comprises:
• a plurality of link assemblies pivotably coupled to the first plate and the second plate and arranged to be bendable together;
• link pins connecting the plurality of link assemblies to one another;
• and
• an elastic leaf spring that surrounds an outer side of the hinge member, the leaf spring having one end connected to the first plate and another end connected to the second plate,
• wherein at least some of the plurality of the link assemblies each have:
• a first through-hole coupling to a coupling portion formed at one end of a respective one of the first plate and the second plate;
• a coupling groove and a link-pin groove in which portions of adjacent link pins are inserted;
• a second through-hole to which a pivot pin is fitted, the second through hole being formed in protrusions on opposite sides of the link-pin groove;
• and
• an upper step that has an inclined portion in close contact with a side of one of the respective adjacent link pins, the upper step serving to restrict excessive outward or opening rotation of the first plate and the second plate relative to one another.