Presented is a modular building unit that includes a top end with a top surface, a bottom end with a bottom surface; a first plate assembly embedded in the top end, and a second plate assembly embedded in the bottom end. A reinforcement member is coupled to one lower tunnel reinforcement, and is coupled to another a lower tunnel reinforcement on progression toward the rear side. The plurality of guide members are individually earthed to a housing of the image forming apparatus through a plurality of earth contacts. A drain region is disposed within the semiconductor substrate, wherein the drain region is surrounded by the p-shape gate. The control unit controls the first pixel group to start frame display operations for displaying a frame and then controls the second pixel group to start frame display operations for displaying another frame before the frame display operations of the first pixel group are completed.