Use of Thiophene Polymer Films for Display Applications
Original Publication Date: 1981-Apr-01
Included in the Prior Art Database: 2005-Feb-11
The use of thiophene polymer film as an electrochromic material for display devices is proposed. Thin films of this material, when prepared on a conducting surface, can be reversibly switched in the potential range between +0.2 and +1.2 V vs. SSCE. During this process, the color of the film changes from a pale yellow (neutral form) to black (oxidized form). A film was switched for 60 minutes with no detectable deterioration. The film switches at speeds near the limit of visual detection. The film remains localized on the electrode surface, thus eliminating the usual problem of migration of the material to the counter electrode. The films can be switched in a variety of aprotic solvents using non-nucleophilic electrolytes.