Title:
LIQUID CRYSTAL IMAGE DISPLAY DEVICE AND LIQUID CRYSTAL IMAGE DISPLAY METHOD
Document Type and Number:
WIPO Patent Application WO/2007/105760
Kind Code:
A1
Abstract:
[PROBLEMS] Encrypting of a liquid crystal display and a limit of an observation region
are to be put into practice. [MEANS FOR SOLVING THE PROBLEMS] An encrypting liquid
crystal panel (30) for displaying encrypted data and a decoding key liquid crystal
panel (40) for displaying decoding key data are disposed in pixel-to-pixel correspondence
to each other. An encrypting means (80) generates encrypted data of video image
data based on a visual decoding type encryption in accordance with a polarizing
light rotating angle change of a polarizing light rotating element for each pixel,
a decoding key generating means (90) generates decoding key data set for the polarizing
light rotating angle for decoding the video image data in accordance with the
polarizing light rotating angle of the encrypted data for each pixel, and the
encrypting liquid crystal panel (30) displays the encrypted data. The decoding
key liquid crystal panel (40) displays the decoding key data and overlaps the
encrypted data and the decoding key data for each pixel, so that a proper polarizing
light rotating angle corresponding to the video image data is given to each pixel,
light passing through a pixel of the encrypting liquid crystal panel and its corresponding
pixel of the decoding key liquid crystal panel reconstructs a video image only
given in the observation region.
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Inventors:
YAMAMOTO HIROTSUGU (JP)
Application Number:
PCT/JP2007/055110
Publication Date:
September 20, 2007
Filing Date:
March 14, 2007
Export Citation:
Assignee:
UNIV TOKUSHIMA (JP)
YAMAMOTO HIROTSUGU (JP)
YAMAMOTO HIROTSUGU (JP)
International Classes:
G09C5/00; G02F1/133; G02F1/1347; G09G3/20; G09G3/34; G09G3/36
Domestic Patent References:
| WO2004055720A1 | 2004-07-01 | |||
| WO2004081870A1 | 2004-09-23 |
Other References:
YAMAMOTO H.: "Saishin no Hikari Joho Shori Sisutemu Shikaku Fukugogata Ango niyoru Secure na Joho Display", OPTICAL AND ELECTRO-OPTICAL ENGINEERING CONTACT, vol. 42, no. 6, 20 June 2004 (2004-06-20), pages 313 - 321, XP003017768
TUYLS P. ET AL.: "Visual Crypto Displays Enabling Secure Communications", CRYPTOLOGY EPRINT ARCHIVE: REPORT 2003/118, 4 June 2003 (2003-06-04), XP019002204, Retrieved from the Internet
TUYLS P. ET AL.: "Visual Crypto Displays Enabling Secure Communications", CRYPTOLOGY EPRINT ARCHIVE: REPORT 2003/118, 4 June 2003 (2003-06-04), XP019002204, Retrieved from the Internet
Attorney, Agent or Firm:
TOYOSU, Yasushi et al. (Kanazawa Tokushima-shi, Tokushima 71, JP)
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