Abstract: A display positioning mechanism includes two hinge modules connected to two ends of a supporting component. Each hinge module includes a preload control washer whereon a constraining structure is formed. Each hinge module further includes a loading component. A fixing end of the loading component is fixed on an end of the supporting component. When an angle of a display and a supporting plane is within a first range, the loading component is preloaded and a free end of the loading component contacts against an end of the constraining structure so as to provide a torque in a first direction to the supporting component. When the angle of the display and the supporting plane is within a second range, the free end of the loading component does not contact against the end of the constraining structure so that the loading component can not provide the torque to the supporting component.