A plurality of pixels are arranged at each intersection of a plurality of scanning lines and a plurality of signal lines, and respectively includes a liquid crystal element displaying grayscales according to a grayscale potential of each signal line during the selection of each scanning line. The inner joint part has a greatest outer diameter which is greater than each of the inner diameters of the end apertures of the ball cage. A motion compensator may a particular memory fetch mode from a plurality of possible modes on a case-by-case basis for the memory fetches associated with a motion compensation decoding process of a macroblock. A first calculating section calculates the TAPI function.