GB1531730A - Liquid crystal devices - Google Patents

Liquid crystal devices

Info

Publication number
GB1531730A
GB1531730A GB9032/75A GB903275A GB1531730A GB 1531730 A GB1531730 A GB 1531730A GB 9032/75 A GB9032/75 A GB 9032/75A GB 903275 A GB903275 A GB 903275A GB 1531730 A GB1531730 A GB 1531730A
Authority
GB
United Kingdom
Prior art keywords
liquid crystal
substrate
layer
crystal material
director
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.)
Expired
Application number
GB9032/75A
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.)
Secretary of State for Defence Canada
UK Secretary of State for Defence
Original Assignee
Secretary of State for Defence Canada
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
Application filed by Secretary of State for Defence Canada, UK Secretary of State for Defence filed Critical Secretary of State for Defence Canada
Priority to GB9032/75A priority Critical patent/GB1531730A/en
Publication of GB1531730A publication Critical patent/GB1531730A/en
Expired 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
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • 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
    • G02F1/1393—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 the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC 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
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133742—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers for homeotropic alignment

Landscapes

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

Abstract

1531730 Controlling light DEFENCE SECRETARY OF STATE FOR 3 March 1976 [4 March 1975] 9032/75 Heading G2F In a cell of the type comprising a layer of liquid crystal material between two electrode bearing substrates, the liquid crystal material has a small negative dielectric anisotropy and a large positive conductivity anisotropy, and the substrates are treated so that the liquid crystal director in the interior of the layer, in the absence of an electric field, is somewhat inclined to the substrate surface normals, whereby when a voltage is applied between the electrodes the liquid crystal molecules tend to reorientate parallel to the plane of the layer in a single sense. If the director was at 90 degrees to the substrate the molecules could tip either clockwise or anti-clockwise, and it is said that this gives rise to local positive and negative space charge regions which move in the field to give Williams domains, and eventually a dynamic turbulence at higher fields. The characteristics of the liquid crystal material are such as to cause rapid realignment at a first threshold voltage, the original alignment being re-attached only when the voltage is reduced below a second threshold lower than the first, i.e. a hystersis effect. As described the cell exhibits variable birefringence and is disposed between polarizers, either without or with one or more interposed birefringent layers, or the liquid crystal material incorporates a dye for variable absorption, with or without a polarizer. Both the substrates may be treated with lecithin, at least one being uni-directionally rubbed to effect the inclined orientation. Rubbing of the second substrate should be parallel and opposite to that of the first. Alternatively at least one substrate has a coating of MgF2 or SiO oblique evaporated at about 5 degrees to its surface. The angle between the substrate normals and the director in the interior of the layer is preferably 1-2 degrees. The electrodes may be shaped or provide an X-Y coincidence addressed matrix.
GB9032/75A 1976-03-03 1976-03-03 Liquid crystal devices Expired GB1531730A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9032/75A GB1531730A (en) 1976-03-03 1976-03-03 Liquid crystal devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9032/75A GB1531730A (en) 1976-03-03 1976-03-03 Liquid crystal devices

Publications (1)

Publication Number Publication Date
GB1531730A true GB1531730A (en) 1978-11-08

Family

ID=9864089

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9032/75A Expired GB1531730A (en) 1976-03-03 1976-03-03 Liquid crystal devices

Country Status (1)

Country Link
GB (1) GB1531730A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2471642A1 (en) * 1979-12-13 1981-06-19 Asahi Glass Co Ltd LIQUID CRYSTAL DISPLAY DEVICES OF THE DONOR-RECEIVER TYPE
EP0434000A2 (en) * 1989-12-21 1991-06-26 Stanley Electric Co., Ltd. Liquid crystal display
EP0483804A2 (en) * 1990-11-02 1992-05-06 Stanley Electric Co., Ltd. Liquid crystal display

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2471642A1 (en) * 1979-12-13 1981-06-19 Asahi Glass Co Ltd LIQUID CRYSTAL DISPLAY DEVICES OF THE DONOR-RECEIVER TYPE
EP0434000A2 (en) * 1989-12-21 1991-06-26 Stanley Electric Co., Ltd. Liquid crystal display
EP0434000A3 (en) * 1989-12-21 1992-04-08 Stanley Electric Co., Ltd. Liquid crystal display
EP0483804A2 (en) * 1990-11-02 1992-05-06 Stanley Electric Co., Ltd. Liquid crystal display
EP0483804A3 (en) * 1990-11-02 1992-12-09 Stanley Electric Co., Ltd. Liquid crystal display
US5229873A (en) * 1990-11-02 1993-07-20 Stanley Electric Co., Ltd. Liquid crystal display having apertures in both electrodes

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee