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FR2230410A1 - Control of molecular orientation in liq. crystals - by applying electric field at varying frequencies - Google Patents

Control of molecular orientation in liq. crystals - by applying electric field at varying frequencies

Info

Publication number
FR2230410A1
FR2230410A1 FR7318951A FR7318951A FR2230410A1 FR 2230410 A1 FR2230410 A1 FR 2230410A1 FR 7318951 A FR7318951 A FR 7318951A FR 7318951 A FR7318951 A FR 7318951A FR 2230410 A1 FR2230410 A1 FR 2230410A1
Authority
FR
France
Prior art keywords
liquid crystal
electric field
field
liq
molecules
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.)
Granted
Application number
FR7318951A
Other languages
French (fr)
Other versions
FR2230410B1 (en
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.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
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 Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Priority to FR7318951A priority Critical patent/FR2230410A1/en
Publication of FR2230410A1 publication Critical patent/FR2230410A1/en
Application granted granted Critical
Publication of FR2230410B1 publication Critical patent/FR2230410B1/fr
Granted 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
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • 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
    • G02F1/1392—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 using a field-induced sign-reversal of the dielectric anisotropy

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Liquid Crystal Substances (AREA)

Abstract

Control of the collective orientation of the molecules of a liquid crystal under the effect of an electric field, where the liquid crystal exhibits dielectric anisotropy i.e. having a dielectric constant parallel to the major axis of a liquid crystal molecule which differs from that parallel to the minor axis of the molecule, the anisotropy being characterised in magnitude and sign by (a) selecting a liq. crystal for which two frequencies (F1, F2) exist for which the dielectric anisotropies have opposite signs, (b) applying a first electric field of frequency (f1) to the selected liquid crystal to cause one of the two axes of each molecules to be rotated in the direction of the field (c) thereafter applying a second electric field of frequency (F2) in the same direction as the first field which causes the other axis to turn in the direction of the field. Enables the refractive index to be controlled by controlling the orientation of the molecules of the liquid crystal, for use in optical systems, e.g. colour television, photo-composition etc.
FR7318951A 1973-05-24 1973-05-24 Control of molecular orientation in liq. crystals - by applying electric field at varying frequencies Granted FR2230410A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7318951A FR2230410A1 (en) 1973-05-24 1973-05-24 Control of molecular orientation in liq. crystals - by applying electric field at varying frequencies

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7318951A FR2230410A1 (en) 1973-05-24 1973-05-24 Control of molecular orientation in liq. crystals - by applying electric field at varying frequencies

Publications (2)

Publication Number Publication Date
FR2230410A1 true FR2230410A1 (en) 1974-12-20
FR2230410B1 FR2230410B1 (en) 1976-06-11

Family

ID=9119947

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7318951A Granted FR2230410A1 (en) 1973-05-24 1973-05-24 Control of molecular orientation in liq. crystals - by applying electric field at varying frequencies

Country Status (1)

Country Link
FR (1) FR2230410A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0123981A2 (en) * 1983-04-29 1984-11-07 F. HOFFMANN-LA ROCHE & CO. Aktiengesellschaft Liquid crystal cell

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1582299A (en) * 1967-09-14 1969-09-26
FR2134160A1 (en) * 1971-04-22 1972-12-08 Commissariat Energie Atomique
FR2139041A1 (en) * 1971-05-25 1973-01-05 Marconi Co Ltd Liquid crystal display matrix - with automatic blanking for non-addressed cross points
FR2140169A1 (en) * 1971-06-02 1973-01-12 Matsushita Electric Ind Co Ltd

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1582299A (en) * 1967-09-14 1969-09-26
FR2134160A1 (en) * 1971-04-22 1972-12-08 Commissariat Energie Atomique
FR2139041A1 (en) * 1971-05-25 1973-01-05 Marconi Co Ltd Liquid crystal display matrix - with automatic blanking for non-addressed cross points
FR2140169A1 (en) * 1971-06-02 1973-01-12 Matsushita Electric Ind Co Ltd

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0123981A2 (en) * 1983-04-29 1984-11-07 F. HOFFMANN-LA ROCHE & CO. Aktiengesellschaft Liquid crystal cell
EP0123981A3 (en) * 1983-04-29 1986-12-03 F. HOFFMANN-LA ROCHE & CO. Aktiengesellschaft Liquid crystal cell

Also Published As

Publication number Publication date
FR2230410B1 (en) 1976-06-11

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Legal Events

Date Code Title Description
ST Notification of lapse