Title: Image decryption system
Application Number: 200480029191 Application Date: 2004.10.04
Publication Number: 1864358 Publication Date: 2006.11.15
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H04K1/00
Applicant(s) Name: Koninkl Philips Electronics NV Address:
Inventor(s) Name: Johnson Mark T., Tuyls Pim T.
Attorney & Agent: cheng tianzheng wang yong
Abstract:
     A decryption device (2) is arranged for visually decrypting an encrypted image displayed on a display device (1) emitting polarized light. The decryption device (2) comprises a polarizing element (21), a liquid crystal display (23), and a further polarizing element (22), arranged such that the polarized light received from the display device (1) and incident on the polarizing element (21) may pass through the liquid crystal display (23) and the further polarizing element (22). The polarizing element (21) comprises a switchable polarizer capable of switching between a first, polarizing state and a second, nonpolarizing state. This allows the decryption device to be used as a stand-alone device which can also be used for other applications. The display device (1) is preferably also provided with a switchable polarizer (12).
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