| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to maintain a color development state at a predetermined color development level.SOLUTION: An electrochromic device 100 comprises: a display substrate 10, display electrode 11, electrochromic layer 12, opposing substrate 14, opposing electrode 13, electrolyte 15, spacer 16, and driving means 17. The electrochromic device causes the driving means 17 to apply a predetermined voltage to between the display electrode 11 and opposing electrode 13 to perform color development drive, measures an open-circuit voltage between the display electrode 11 and opposing electrode 13 to calculate, by using an approximate expression, an open-circuit voltage after the lapse of a predetermined period at which the open-circuit voltage is stabilized or an open-circuit voltage at which the absolute value of the change over time of the open-circuit voltage becomes equal to or lower than a threshold; and applies the calculated voltage to the display electrode 11 and opposing electrode 13.SELECTED DRAWING: Figure 2 |
