The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 26, 2002
Filed:
Aug. 16, 1999
Peter Reichmann, Gelsenkirchen, DE;
Jens Cardinal, Bochum, DE;
Pilkington Deutschland AG, Gelsenkirchen, DE;
Abstract
A process is disclosed for driving an electrochromic element which consists of at least the following layers: a first electrode layer; a first layer in which ions can be reversibly intercalated; a transparent ion-conducting layer; a second layer in which ions can be reversibly intercalated; and a second electrode layer. One of the layers in which ions can be reversibly intercalated is an electrochromic layer and the other layer acts as a counter-electrode to the electrochromic layer. A voltage with values in a redox stability range of the electrochromic layer system is applied to the electrode layers and causes a change in color. The process is characterised in that the current (I) which flows through the electrochromic element is continuously measured. During a starting phase of the change in color, the voltage (U) rises or diminishes continuously to a maximum, predetermined, temperature-dependent end value (U ). The extent to which the end value depends on the temperature varies with the model of the electrochromic element, but not with the surface area of the electrochromic element which changes color. During the change in color, the voltage (U) is controlled depending on the current (I) and does not exceed the end value (U ).