In this study, Recently, as the technology to handle the display ledger increases, the size of display equipment is increasing in order to increase productivity. In addition to increasing the size of displayr equipment, components are being added to improve precision. In addition, due to the problem of increasing the weight of the equipment due to the components for refinement, the lower frame supporting the equipment requires high rigidity in consideration of maintaining precision and increasing the weight of the display equipment. In order to satisfy this, a lower frame is being designed, but a design standard for designing the frame is not set, and there is a problem in that the weight is increased. The lower frame supporting the equipment handling display needed a frame design plan according to the equipment characteristics to secure high precision as well as rigidity to withstand the load of the object. Specific studies are needed for optimal design through research and parameter setting. In this paper, we propose an optimal design method according to the thickness of the lower frame supporting the display repair device, which is a high-load equipment, and the material applied. Considering the size of the lower frame and the weight of the equipment, the thickness of the lower frame, the number of supports, and the applied material were set as design variables. The structure was set according to the thickness of the frame and the number of supports, and case study modeling was performed according to the applied material. Considering the size of the frame, a finite element analysis of the case study modeling was performed in which the weight of the equipment was applied as a load condition. Through finite element analysis, the amount of deformation, stress, and weakness of the lower frame were checked, and major design variables were confirmed. It was verified that the weight reduction and static strength could be satisfied at the same time by performing lightweight optimization according to major design variables.