A higher harmonic suppressor element 10 includes a higher harmonic coil 12 for suppressing a higher harmonic and a thermal fuse 14 which is connected in series with the higher harmonic coil 12 and also which is melted down by heat generated by the higher harmonic coil 12. Then, the liquid crystal cell is heated and then quickly cooled so as to prevent non-uniform illuminance from occurring in the display. A voltage dividing circuit comprising resistances and current mirror differential amplifiers are placed in active states to output \u201cH\u201d as a signal A which controls a boost voltage Vbt is made through. The method includes determining real and imaginary components of a first voltage at a first terminal of the series element. These memory cells include floating gate electrodes with open-ended wraparound shapes that operate to reduce the cell-to-cell coupling capacitance in a bit line direction, while still maintaining a high coupling ratio between control and floating gate electrodes within each memory cell.