Patent ID: 6856444
Filing Date: 2005-02-15
Classification: G02F

Abstract:
1. A process for driving an electrochromic (EC) device comprising: applying a driving signal to bleach or color the EC device, wherein initially the driving signal has a voltage amplitude that is harmless to the EC device at any temperature; measuring a first voltage amplitude of the driving signal applied to the EC device; measuring a second voltage amplitude of the driving signal applied to the EC device; measuring a first current amplitude of the driving signal applied to the EC device; measuring a second current amplitude of the driving signal applied to the EC device; determining a voltage amplitude difference between the first voltage amplitude and the second voltage amplitude; determining a current amplitude difference between the first current amplitude and the second current amplitude; determining a first resistance from the voltage amplitude difference and the current amplitude difference; determining a second resistance by subtracting a third resistance from the first resistance, wherein the third resistance is a static resistance of the EC device that is static relative to temperature change of the EC device; and adjusting the first and second voltage amplitudes to a maximum amplitude that is harmless to the EC device at a present temperature that is inferred from the second resistance.