Electrochromic display device (USH0000264)
Original Publication Date: 1987-May-05
Included in the Prior Art Database: 2008-Mar-28
US Statutory Invention Registration (SIRs)
Related DocumentsPatent/Patent Application:
A chemically coupled color-changing matrix display device is disclosed wherein the display material is a surfactant-treated color changing metal-diphthalocyanine complex. For example, lutetium diphthalocyanine may be treated with a mixture of silicone glycol and imidazoline surfactants to provide a deposit having substantially the same color as electrolytically cycled deposits of the same material. Also disclosed is a non-electronic chemical sensing device comprising a surfactant-treated electrochromic metal diphthalocyanine complex. Upon exposure to a hazardous gas such as chlorine, the surfactant-treated material undergoes a change in color.