Fitting structure and display device

A fitting structure, comprising a first device, a second device, and a position-limiting device configured to fixedly connect the first device and the second device,

• wherein the position-limiting device comprises a pre-fitting stepped portion which is provided in the first device and a threaded portion and a relief groove portion which are provided in the second device, and the relief groove portion is arranged between the pre-fitting stepped portion and the threaded portion;
• the position-limiting device further comprises a position-limiting stepped portion which is arranged between the pre-fitting stepped portion and the relief groove portion and is located in the first device;
• and
• a height of the relief groove portion is set so that the position-limiting stepped portion is in contact with a fixing face which is a face of the second device which is fixedly connected by the position-limiting device;
• and
• wherein the fitting structure further comprises a positioning device configured to connect the first device and the second device, a slot corresponding to the positioning device is disposed at the bottom of the second device, so that the first device is fixed onto the second device by inserting into the slot of the positioning device, and an inserting direction of the positioning device in the second device is perpendicular to an inserting direction of the position-limiting device in the second device.