This invention provides a compact heat exchanger that has an effective geometry for heat transfer operations regardless of the heat conductivity of the material chosen for the fin materials. The control device controls the spatial light modulator and the color sequential light generation device to change the ratio of the display time of each color of the reflected light time-shared in the display period of the frame depending on the character andor the set value of the input picture data. One or more of the operator interface controls may be included in a run-time operator interface application, which may aid the user in easily creating the run-time operator interface application. When adjacent slabs move away from each other, the narrow end of the tapered load plate moves out of the void that it created in the slab thus allowing the slabs to move relative to one another in a direction parallel to the joint. A sufficient and satisfactory capacitance can be obtained and the aperture ratio is raised.