Global Patent Index - EP 1766462 A2

EP 1766462 A2 20070328 - 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

EP 1766462 A2 20070328 (EN)

Application

EP 05754190 A 20050519

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)

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