Motion mechanism applied to inner folding flexible screen terminal and inner folding flexible screen terminal

A motion mechanism applied to an inner folding flexible screen terminal, comprising a middle support structure, wherein the middle support structure is provided with a flexible screen support surface, the middle support structure is connected to left and right support frames through a synchronization mechanism, the motion mechanism is also provided with left and right cranks and left and right connecting plates, the left and right cranks are both rotatably connected to the middle support structure, the left and right connecting plates are respectively rotatably connected to the left and right cranks and respectively slidably connected to the left and right support frames, and the left and right connecting plates are respectively provided with connecting positions of left and right housings of the flexible screen terminal;

• positions of rotation centers of the left crank and the left support frame are configured such that in the course that the flexible screen terminal is unfolded to folded, the left connecting plate moves toward a direction far away from the middle support structure, and in the course from being folded to unfolded, the left connecting plate moves toward the middle support structure;
• positions of rotation centers of the right crank and the right support frame are configured such that in the course that the flexible screen terminal is unfolded to folded, the right connecting plate moves toward a direction far away from the middle support structure, and in the course from being folded to unfolded, the right connecting plate moves toward the middle support structure;
• and
• further, rotation centers of the left and right cranks are both higher than the flexible screen support surface of the middle support structure and are close to or at a height in a position where a flexible screen is neither extended nor shortened when being bent and unfolded in a thickness direction of the flexible screen.