Foldable mechanism, bracket structure, and electronic device

A foldable mechanism, comprising a first screen support plate, a second screen support plate, a third screen support plate, a first housing seat, a second housing seat and a base, wherein:

• the first housing seat is arranged on the first screen support plate, and the first screen support plate is rotatably matched with the first housing seat;
• the second housing seat is arranged on the second screen support plate, and the second screen support plate is rotatably matched with the second housing seat;
• the base is provided with a plurality of first rotating parts, and the first housing seat and the second housing seat are rotationally connected to the plurality of first rotating parts in a one-to-one correspondence through their respective second rotating parts;
• the foldable mechanism has an unfolded state and a folded state, and in the unfolded state, respective first sides of the first screen support plate and the second screen support plate are located between respective second sides of the first screen support plate and the second screen support plate, the third screen support plate is located between the first screen support plate and the second screen support plate, and the first screen support plate, the second screen support plate, and the third screen support plate are arranged in a flush manner away from a first surface of the base;
• and
• in the folded state, a spacing between the respective first sides of the first screen support plate and the second screen support plate is greater than that of the respective second sides of the first screen support plate and the second screen support plate.