A coupling structure coupled between a base and a display panel is disclosed to include a pivot structure fixedly fastened to the base, a rotary platform pivotally coupled to the pivot structure for allowing rotation of the rotary platform on the pivot structure, a gear set, which includes a center gear fixedly fastened to the pivot structure and a left-side gear and a right-side gear pivotally mounted inside the rotary platform and meshed with the center gear at two sides respectively, the left-side and right-side gears each having the same number of teeth and a raised portion, and a hinge member, which is received inside the rotary platform and fixedly fastened to the display panel and has two elongated blind holes respectively coupled to the raised portions of the left-side gear and right-side gear.