Foldable screen device, supporting device and supporting structure

A supporting structure, comprising:

• a carrying plate, configured to carry a foldable screen in a parallel direction;
• a supporting assembly, comprising a first supporting member and a second supporting member, the first supporting member and the second supporting member both rotatably connected to both ends of the carrying plate respectively;
• a first coupling shaft, located between the first supporting member and the second supporting member and disposed parallel to the carrying plate and parallel to both a rotation axis of the first supporting member and a rotation axis of the second supporting member;
• and a first connecting assembly, comprising a first connecting piece and a second connecting piece, the first connecting piece rotatably connected to the first supporting member piece and rotatably connected to the first coupling shaft, and the second connecting piece rotatably connected to the second supporting member and rotatably connected to the first coupling shaft;
• wherein, in a case that the first coupling shaft is located at a first position, both an end of the first connecting piece away from the first coupling shaft and an end of the second connecting piece away from the coupling shaft are located at a side of the coupling shaft away from the carrying plate in a direction perpendicular to the carrying plate, the first connecting piece and the second connecting piece form a first included angle, and both the first supporting member and the second supporting member are inclined with respect to the carrying plate;
• and in a case that the first coupling shaft is located at a second position, the first connecting piece and the second connecting piece form a second included angle greater than the first included angle, and the first supporting member and the second supporting member are disposed opposite to each other so as to support the carrying plate, wherein the location of the first coupling shaft in the second position is on a side of the location of the first coupling shaft in the first position away from the carrying plate.