GB2324619A - Alignment of ferroelectric liquid crystal devices - Google Patents

Alignment of ferroelectric liquid crystal devices

Info

Publication number
GB2324619A
GB2324619A GB9816487A GB9816487A GB2324619A GB 2324619 A GB2324619 A GB 2324619A GB 9816487 A GB9816487 A GB 9816487A GB 9816487 A GB9816487 A GB 9816487A GB 2324619 A GB2324619 A GB 2324619A
Authority
GB
United Kingdom
Prior art keywords
liquid crystal
alignment
cell
smectic
cool
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.)
Withdrawn
Application number
GB9816487A
Other versions
GB9816487D0 (en
Inventor
John Clifford Jones
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.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
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
Priority claimed from GBGB9604461.5A external-priority patent/GB9604461D0/en
Application filed by UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Priority to GB9816487A priority Critical patent/GB2324619A/en
Publication of GB9816487D0 publication Critical patent/GB9816487D0/en
Publication of GB2324619A publication Critical patent/GB2324619A/en
Withdrawn legal-status Critical Current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
    • G02F1/141—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 ferroelectric liquid crystals
    • G02F1/1416—Details of the smectic layer structure, e.g. bookshelf, chevron, C1 and C2

Abstract

A liquid crystal device comprises a liquid crystal cell including a layer of ferro electric smectic liquid crystal material contained between two walls bearing electrodes and surface treated to give both an alignment and a surface tilt to liquid crystal molecules. The material adopts a C 2 rather than a C 1 arrangement by arranging the surface pretilt # and the ratio of azimuthal to zenithal anchoring energies #/α to give a positive energy difference #W s for the liquid crystal director at the surface in the C 1 and C 2 states. Additionally the provision of a C 2 state may be enhanced by allowing the cell to cool from the isotropic phase to a temperature just below a smectic A to chiral smectic phase, then applying a 50 Hz ac voltage in the range typically 0.1 to 5 volts rms. across the liquid crystal layer for about 90 seconds, then allowing the cell to cool to ambient temperature.
GB9816487A 1996-03-01 1997-02-26 Alignment of ferroelectric liquid crystal devices Withdrawn GB2324619A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9816487A GB2324619A (en) 1996-03-01 1997-02-26 Alignment of ferroelectric liquid crystal devices

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB9604461.5A GB9604461D0 (en) 1996-03-01 1996-03-01 Alignment of ferroelectric liquid crystal displays
GB9816487A GB2324619A (en) 1996-03-01 1997-02-26 Alignment of ferroelectric liquid crystal devices
PCT/GB1997/000531 WO1997032236A1 (en) 1996-03-01 1997-02-26 Alignment of ferroelectric liquid crystal devices

Publications (2)

Publication Number Publication Date
GB9816487D0 GB9816487D0 (en) 1998-09-23
GB2324619A true GB2324619A (en) 1998-10-28

Family

ID=26308849

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9816487A Withdrawn GB2324619A (en) 1996-03-01 1997-02-26 Alignment of ferroelectric liquid crystal devices

Country Status (1)

Country Link
GB (1) GB2324619A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2274519A (en) * 1993-01-20 1994-07-27 Marconi Gec Ltd Liquid crystal devices

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2274519A (en) * 1993-01-20 1994-07-27 Marconi Gec Ltd Liquid crystal devices

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
International Ferroelectric Conference (FLC 95) vol. 178 no. 1-4 *
Second international Symposium on Ferroelectric Liquid Crystals vol. 114 no. 1-4 pp. 3-26 *

Also Published As

Publication number Publication date
GB9816487D0 (en) 1998-09-23

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)