Rotary shaft mechanism and foldable display device

A foldable display device, comprising:

• a rotary shaft mechanism;
• and
• a display panel fixed on the rotary shaft mechanism;
• wherein the rotary shaft mechanism comprises a curved base, two screen support plates, a curved slider, and a rotating block;
• the curved base comprises a first centerline extending along a first direction, and the curved base comprises two curved connecting portions symmetrically arranged around the first centerline;
• in the first direction, the two screen support plates are respectively on opposite sides of the curved base, each curved connecting portion is connected to a corresponding screen support plate through the curved slider and the rotating block;
• along the first direction, each curved connecting portion is divided into a second curved guide groove and a first curved guide groove, both the second curved guide groove and the first curved guide groove extend along a second direction, the second direction is perpendicular to the first direction;
• the rotating block comprises a curved connector connected to the first curved guide groove, and a sliding connector slidably connected to the screen support plate;
• the curved slider is rotatably connected to an inner wall of the second curved guide groove, and the curved slider is rotatably connected to the screen support plate through a pin-shape shaft, a vertical distance between a rotation center of the curved slider and a first plane is different from a vertical distance between a rotation center of the rotating block and the first plane, so that when the rotary shaft mechanism is folded, the rotating block and the screen support plate slide relatively in a direction parallel to the screen support plate, and the first plane is a contact plane between the screen support plate and the rotating block.