Process for driving an electrochromic element

US6362806B1 · kind B1 · utility

Assignee

• Pilkington Deutschland AG · DE

Inventors

• Peter Reichmann · Gelsenkirchen, DE
• Jens Cardinal · Bochum, DE

Key dates

• Filing date: Aug 16, 1999
• Grant date: Mar 26, 2002
• Expiry date: Aug 16, 2019

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E06B2009/2464
• WIPO field: Civil engineering
• WIPO sector: Other fields

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 (Umax). 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 …