EP 1766462 A4 20080813 - OPTICAL SWITCHING DEVICE USING HOLOGRAPHIC POLYMER DISPERSED LIQUID CRYSTALS
Title (en)
OPTICAL SWITCHING DEVICE USING HOLOGRAPHIC POLYMER DISPERSED LIQUID CRYSTALS
Title (de)
OPTISCHE UMSCHALTEINRICHTUNG MIT HOLOGRAPHISCHEN POLYMERDISPERGIERTEN FLÜSSIGKRISTALLEN
Title (fr)
DISPOSITIF DE COMMUTATION OPTIQUE FAISANT APPEL A DES CRISTAUX LIQUIDES DISPERSES DANS UN POLYMERE HOLOGRAPHIQUE
Publication
Application
Priority
- US 2005017994 W 20050519
- US 85071304 A 20040520
- US 85071404 A 20040520
Abstract (en)
[origin: WO2005114310A2] A thin holographic optical switch (100) used in a liquid crystal display device (800) contains opposing transparent substrates, (102) transparent electrodes (104) between the substrates (102) and a diffraction grating (105) between the electrodes (104). The diffraction grating (105) contains regions of transparent polymerized photopolymers and cholesteric liquid crystal microdroplets. Refractive indexes of the photopolymers and liquid crystal are substantially the same when the electrodes have the same potential. The holographic optical switch (100) transmits broadband LED light when the potential difference between the electrodes (104) is zero and is polarization independent. The holographic optical switch (100) diffracts broadband LED light when the potential difference between the electrodes (102) is non-zero and is polarization independent.
IPC 8 full level
G02F 1/13 (2006.01); G02F 1/1334 (2006.01); G02F 1/1335 (2006.01); G02F 1/31 (2006.01); H04M 1/02 (2006.01)
CPC (source: EP)
G02F 1/13342 (2013.01); G02F 1/31 (2013.01); G02F 1/133615 (2013.01); G02F 2203/06 (2013.01)
Citation (search report)
- [Y] JP 2004140436 A 20040513 - KYOCERA CORP
- [Y] JP 2002311435 A 20021023 - MATSUSHITA ELECTRIC IND CO LTD
- [YA] US 2003058400 A1 20030327 - ZHUANG SONGLIN [CN], et al
- [A] US 6646772 B1 20031111 - POPOVICH MILAN M [GB], et al
- [A] EP 1211869 A1 20020605 - SIEMENS AG [DE]
- See references of WO 2005114310A2
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2005114310 A2 20051201; WO 2005114310 A3 20060803; EP 1766462 A2 20070328; EP 1766462 A4 20080813; JP 2007538293 A 20071227; JP 4889643 B2 20120307
DOCDB simple family (application)
US 2005017994 W 20050519; EP 05754190 A 20050519; JP 2007527537 A 20050519