| 摘要 |
PURPOSE:To prevent the degradation of an electrochromic EC element and related elements by using a staircase square wave voltage and a pulse interrupted voltage as the driving impression voltage for coloring and short-circuiting both terminals of the EC element at the time of achromatizing. CONSTITUTION:In a coloring process Tc, a staircase square wave voltage 1 whose value is reduced from VD to VS after a time tc1 is applied, and the high voltage VD is impressed in the initial stage and the impressed voltage is reduced to VS when coloring advances to a certain degree, and the EC element reaches a prescribed coloring density in the time Tc. After the EC element reaches the prescribed coloring density, a pulse interrupted voltage 2 having a crest value VS, a pulse width TD2, and a pulse interval TD1 is impressed in a coloring holding process. Both terminals of the EC element are short- circuited for a time T2 in the achromatizing process. Thee responsiveness of the element is improved in the coloring process and the pulse interrupted voltage is impressed in the coloring holding process and terminals are short-circuited at the time of achromatizing, thereby minimizing the degradation of the element to extent the life of the EC element.
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