Abstract: The object is to improve the accuracy of signature input and signature verification and improve security by causing the handwriting of a signature to disappear by itself. The signature verification system includes a signature input apparatus 1 and a signature verifying apparatus 6. Signature input apparatus 1 has an externally charged type liquid crystal sheet 2 which has an underside being adhesive and is placed on a coordinate input unit 3. When a dedicated pen 5 having the function of applying static charge onto this liquid crystal sheet 2 is used to write a signature, the handwriting of the signature is liquid crystal representation on the display area of liquid crystal sheet 2 and this handwriting of the signature will disappear by itself after a predetermined period of time.

Abstract: A coordinates input device includes: a liquid crystal sheet comprising a conductive layer, a transparent high electric resistant layer, a liquid crystal-dispersed polymer layer, and a transparent insulating layer, all of which are sequentially laminated on a board; and a tablet comprising a Y-axis coordinate resistant sheet, a pressure sensitive sheet, an electrode sheet, a pressure sensitive sheet, an X-axis coordinates resistant sheet, and a flexible film for protection, all of which are sequentially laminated on a base. The Y-axis coordinates resistant sheet and the X-axis coordinates resistant sheet are connected to a detecting circuit for detecting coordinates indicated by a coordinates indicator.