Foldable display device

A foldable display device, comprising:

• a first body and a second body that are formed in the same shape as a plate and are arranged symmetrically with each other;
• a display part attached to the first body and the second body and configured to be folded or stretched out such that when the display part is folded, a curved arc-shaped portion is defined;
• and
• a hinge device assembled to connect the first body and the second body to each other, such that the hinge device is rotated within an opened state range where the first and second bodies are placed on the same plane and within a closed state range where the first and second bodies overlap each other,
• wherein the hinge device includes:
• a base part provided to have a length corresponding to a length of the first and second bodies and having first and second shafts formed symmetrical with each other;
• a cam connection part configured with first and second cam gears respectively provided at ends of the first and second shafts to be engaged with each other, the cam connection part being configured to transmit a rotational force such that the first and second shafts are rotated simultaneously;
• first and second guide parts respectively having coupling portions each provided at a side of each of the first and second guide parts and coupled to the first and second shafts, the first and second guide parts being comprised of plate members having a predetermined area and respectively connected to the coupling portions, the plate members respectively having guide rails each inclinedly formed at opposite sides of each of the plate members;
• connection members respectively having slits each inclinedly formed at a side of the connection members such that the guide rails of the first and second guide parts are engaged into the slits, the connection members being respectively mounted on support plates;
• and
• first and second hinge covers respectively coupled to the ends of the first and second shafts to be rotatable and each having a rail groove formed at opposite sides thereof.