| 摘要 |
A method of and a device ( 501 ) for reconstructing a graphical message ( 520 ) using visual cryptography. Cells ( 303, 304 ) in a first liquid crystal display ( 701 ) are activated if a bit in a message sequence represents '1', and not activated if said bit represents '0'. Cells ( 303, 304 ) in a second liquid crystal display ( 511 ) are activated if a bit in a key sequence represents '0', and not activated if said bit represents '1'. The first and second displays ( 701, 511 ) are then superimposed so as to visually reconstruct the graphical message ( 520 ). Preferably a portion of a polarization filter ( 305 ) in an area of the first liquid crystal display ( 701 ), and a corresponding portion of a polarization filter ( 302 ) in an area of the second liquid crystal display ( 511 ) have been omitted to allow superimposition of the first and second liquid crystal displays ( 701, 511 ) at said areas.
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