WO2009004665A3 - Liquid crystal mixture and its use for bistable or multistable electro-optical devices - Google Patents

Liquid crystal mixture and its use for bistable or multistable electro-optical devices Download PDF

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Publication number
WO2009004665A3
WO2009004665A3 PCT/IT2008/000444 IT2008000444W WO2009004665A3 WO 2009004665 A3 WO2009004665 A3 WO 2009004665A3 IT 2008000444 W IT2008000444 W IT 2008000444W WO 2009004665 A3 WO2009004665 A3 WO 2009004665A3
Authority
WO
WIPO (PCT)
Prior art keywords
order
nematic
bistable
multistable
textures
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IT2008/000444
Other languages
French (fr)
Other versions
WO2009004665A2 (en
Inventor
Riccardo Barberi
Robert Bartolino
Giusepp Lombardo
Federica Ciuchi
Santo Maria Penelope De
Epifanio Guido Virga
Habib Ayeb
Georges Durand
Andre Mathias Sonnet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Universita della Calabria
Original Assignee
Universita della Calabria
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Universita della Calabria filed Critical Universita della Calabria
Priority to EP08790033A priority Critical patent/EP2486106A2/en
Publication of WO2009004665A2 publication Critical patent/WO2009004665A2/en
Publication of WO2009004665A3 publication Critical patent/WO2009004665A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/139—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
    • G02F1/1391—Bistable or multi-stable liquid crystal cells
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/02—Liquid crystal materials characterised by optical, electrical or physical properties of the components, in general
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/40—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit containing elements other than carbon, hydrogen, halogen, oxygen, nitrogen or sulfur, e.g. silicon, metals
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2202/00—Materials and properties
    • G02F2202/06—Materials and properties dopant

Landscapes

  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Liquid Crystal Substances (AREA)

Abstract

Nematic liquid crystals under certain circumstances assume locally and sometimes only temporarily configurations characterized by a biaxial order. This fact allows to connect uniaxial nematic textures with different topology without complete fusion of the nematic order, i.e. without the need to reduce the scalar order parameter to zero. The control of these transitions with electric fields allows to realize bistable or multistable displays of new conception. In fact, two bistable or multistable textures are separated by a barrier of a well defined potential that is determined from a biaxial intermediate state, that connects said textures, determining the reorientation without rotation of the nematic director. Such mechanism is known in scientific literature as 'order reconstruction'. The scope of the present invention is to realize mixtures of calamitic nematic liquid crystals with materials that favour the tendency to assume a biaxial order, in order to reduce the external electric field intensity necessary to reconstruct the order.
PCT/IT2008/000444 2007-06-29 2008-06-30 Liquid crystal mixture and its use for bistable or multistable electro-optical devices Ceased WO2009004665A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08790033A EP2486106A2 (en) 2007-06-29 2008-06-30 Liquid crystal mixture and its use for bistable or multistable electro-optical devices

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITCS2007A000032 2007-06-29
ITCS20070032 ITCS20070032A1 (en) 2007-06-29 2007-06-29 BIASSIAL DISPOSAL OF NEMATIC CALAMITICS FOR BISTABLE OR MULTISTABLE DISPLAYS

Publications (2)

Publication Number Publication Date
WO2009004665A2 WO2009004665A2 (en) 2009-01-08
WO2009004665A3 true WO2009004665A3 (en) 2009-02-12

Family

ID=40032440

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2008/000444 Ceased WO2009004665A2 (en) 2007-06-29 2008-06-30 Liquid crystal mixture and its use for bistable or multistable electro-optical devices

Country Status (3)

Country Link
EP (1) EP2486106A2 (en)
IT (1) ITCS20070032A1 (en)
WO (1) WO2009004665A2 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2330214A (en) * 1997-10-08 1999-04-14 Secr Defence Bistable nematic liquid crystal device
US20040164276A1 (en) * 2003-02-17 2004-08-26 Harald Hirschmann 1,4-Di-(trans-4-cyclohexyl)benzene derivatives and their use in liquid crystal media and liquid crystal devices
US20040188654A1 (en) * 2003-02-26 2004-09-30 Jean Claude Dubois Nematic liquid crystal mixtures for bistable display devices
US20070080325A1 (en) * 2003-05-08 2007-04-12 Goulding Mark J Liquid crystal composition for use in bistable liquid crystal devices

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2330214A (en) * 1997-10-08 1999-04-14 Secr Defence Bistable nematic liquid crystal device
US20040164276A1 (en) * 2003-02-17 2004-08-26 Harald Hirschmann 1,4-Di-(trans-4-cyclohexyl)benzene derivatives and their use in liquid crystal media and liquid crystal devices
US20040188654A1 (en) * 2003-02-26 2004-09-30 Jean Claude Dubois Nematic liquid crystal mixtures for bistable display devices
US20070080325A1 (en) * 2003-05-08 2007-04-12 Goulding Mark J Liquid crystal composition for use in bistable liquid crystal devices

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
BARBERI R ET AL: "Electric field induced order reconstruction in a nematic cell", EUROPEAN PHYSICAL JOURNAL E EDP SCIENCES; SPRINGER-VERLAG FRANCE, vol. 13, no. 1, 2 March 2004 (2004-03-02), pages 61 - 71, XP002507883, ISSN: 1292-8941 *
CIUCHI F ET AL: "Control of transient biaxial order in calamitic nematics", APPLIED PHYSICS LETTERS AMERICAN INSTITUTE OF PHYSICS USA, vol. 91, no. 24, 10 December 2007 (2007-12-10), pages 244104 - 1, XP002507132, ISSN: 0003-6951 *
DOZOV I ET AL: "Fast bistable nematic display using monostable surface switching", APPLIED PHYSICS LETTERS, AIP, AMERICAN INSTITUTE OF PHYSICS, MELVILLE, NY, vol. 70, no. 9, 3 March 1997 (1997-03-03), pages 1179 - 1181, XP002170223, ISSN: 0003-6951 *

Also Published As

Publication number Publication date
ITCS20070032A1 (en) 2008-12-30
EP2486106A2 (en) 2012-08-15
WO2009004665A2 (en) 2009-01-08

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