摘要 |
The authenticity of a security document, such as a bank note, is verified by use of a security feature arranged in or on the document, which security feature comprises an antenna arranged to receive EM-radiation from an external energy source; a rectifier arranged to receive electric energy from the antenna and convert it into a rectified current; and an electrochromic display arranged to alter its electrochromic state in response to said rectified current. Hence, a security feature able alter its appearance in response to EM- radiation is provided, which comprises a display that can be given a large variety of two dimensional shapes. |
申请人 |
DE LA RUE INTERNATIONAL LIMITED |
发明人 |
NORDLINDER, STAFFAN;NORBERG, PETRONELLA;ROBERTSSON, MATS;WANG, XIN;HENNERDAL, LARS-OLOV;COOPER, PHILIP GEORGE;SNELLING, JAMES PETER;MALMSTROM, ANNA |