Patent ID: 8004739

Claim:
A control device for at least one electrochromic window, comprising: means for generating a charging current, to bring the at least one electrochromic window from a first state into a second state, wherein the at least one electrochromic window is darker in the second state than in the first state, and means for discharging the at least one electrochromic window, to bring the at least one electrochromic window from the second state into the first state, wherein the discharging of the at least one electrochromic window can be triggered by an emergency signal, wherein the means for discharging comprise switching means, in order to interconnect first and second window regions of the at least one electrochromic window electrically in such a way that a resulting voltage for generating a discharging current for discharging the first and second window regions is greater than charging voltages of the first and second window regions, and wherein the resulting voltage is obtained from a sum of the charging voltages of the first and second window regions.