Back to results
US 5,847,858 AGranted
Electrochromic element
AssigneeU.S. Philips Corporation
InventorsLeo H. M. Krings, Emmanuel W. J. L. Oomen
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeU.S. Philips Corporation
InventorsLeo H. M. Krings, Emmanuel W. J. L. Oomen
Estimating the term…
The electrochromic element comprises an electrochromic layer (22) whose transmission properties change when a voltage difference is applied across the element. Said electrochromic layer (22) comprises a first metal oxide of the group formed by WO.sub.3, MoO.sub.3, Nb.sub.2 O.sub.5, MnO.sub.2 and ZrO.sub.2 (and combinations thereof) and a second metal oxide containing V.sub.2 O.sub.5, TiO.sub.2 and/or ZnO. If the concentration of the second metal in the mixture ranges from 1 to 15 at. %, preferably from 3 to 10 at. %, the electrochromic layer (22) is transparent and colorless if no guest atoms are incorporated in the layer, and it is (color neutral) grey if a substantial concentration of guest atoms is incorporated in the layer. Electrochromic elements are provided, for example, on the outer surface of a display screen of a display device.
An electrochromic element comprising an electrochromic layer (22), the transmission properties of the electrochromic layer (22) in the visible region undergoing a change when a voltage difference is applied across the element, characterized in that the electrochromic element (22) comprises a mixture of a first metal oxide of a metal selected from the group formed by tungsten, molybdenum, niobium, manganese, zirconium, and combinations thereof, and of a second metal oxide of a metal selected from the group formed by vanadium, titanium, zinc, and combinations thereof, and in that the concentration of the second metal, expressed as a percentage of the total number of metal atoms in the mixture, ranges from 1 to 15 at.%.
Dependencies are inferred from the claim text.