FR2360145A1 - Liq. crystal image memory system - uses smectic liq. crystal giving long duration memory and high resolution - Google Patents

Liq. crystal image memory system - uses smectic liq. crystal giving long duration memory and high resolution

Info

Publication number
FR2360145A1
FR2360145A1 FR7623180A FR7623180A FR2360145A1 FR 2360145 A1 FR2360145 A1 FR 2360145A1 FR 7623180 A FR7623180 A FR 7623180A FR 7623180 A FR7623180 A FR 7623180A FR 2360145 A1 FR2360145 A1 FR 2360145A1
Authority
FR
France
Prior art keywords
liq
crystal
liquid crystal
high resolution
long duration
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Withdrawn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
FR7623180A
Other languages
French (fr)
Inventor
Stephen Boronkay
Michel Steers
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.)
Laboratoires dElectronique Philips SAS
Original Assignee
Laboratoires dElectronique et de Physique Appliquee
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 Laboratoires dElectronique et de Physique Appliquee filed Critical Laboratoires dElectronique et de Physique Appliquee
Priority to FR7623180A priority Critical patent/FR2360145A1/en
Publication of FR2360145A1 publication Critical patent/FR2360145A1/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Withdrawn legal-status Critical Current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
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/135—Liquid crystal cells structurally associated with a photoconducting or a ferro-electric layer, the properties of which can be optically or electrically varied
    • 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
    • G02F1/132—Thermal activation of liquid crystals exhibiting a thermo-optic effect

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)

Abstract

The system is designed to memorise images and includes a liquid crystal-photoconductor pair. This liquid crystal and photoconductor pair is associated with electrical polarising circuits, a light source which illuminates the pair and a read system. The liquid crystal is a smectique. A liquid crystal and it is initially orientated. The smectic liquid crystals used such that the anistrophy of the dielectric constant can be positive or negative. When the anistrophy is positive the liquid crystal is initially orientated in a planar direction. When the anistrophy of the dielectric constant is negative the initial orientation of the liquid crystal is in a homeotropic direction.
FR7623180A 1976-07-29 1976-07-29 Liq. crystal image memory system - uses smectic liq. crystal giving long duration memory and high resolution Withdrawn FR2360145A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7623180A FR2360145A1 (en) 1976-07-29 1976-07-29 Liq. crystal image memory system - uses smectic liq. crystal giving long duration memory and high resolution

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7623180A FR2360145A1 (en) 1976-07-29 1976-07-29 Liq. crystal image memory system - uses smectic liq. crystal giving long duration memory and high resolution

Publications (1)

Publication Number Publication Date
FR2360145A1 true FR2360145A1 (en) 1978-02-24

Family

ID=9176328

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7623180A Withdrawn FR2360145A1 (en) 1976-07-29 1976-07-29 Liq. crystal image memory system - uses smectic liq. crystal giving long duration memory and high resolution

Country Status (1)

Country Link
FR (1) FR2360145A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989003578A1 (en) * 1987-10-06 1989-04-20 The General Electric Company, Plc Devices and process for producing microfilm and microfiche records
US5140448A (en) * 1990-10-24 1992-08-18 Greyhawk Systems, Inc. Apparatus for and method of operation of smectic liquid crystal light valve having scattering centers

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989003578A1 (en) * 1987-10-06 1989-04-20 The General Electric Company, Plc Devices and process for producing microfilm and microfiche records
GB2210703A (en) * 1987-10-06 1989-06-14 Gen Electric Co Plc Optical storage device
GB2210703B (en) * 1987-10-06 1991-03-20 Gen Electric Co Plc Apparatus and process for producing microfilm and microfiche records.
US5157528A (en) * 1987-10-06 1992-10-20 The General Electric Company, P.L.C. Devices and process for producing microfilm and microfiche records
US5140448A (en) * 1990-10-24 1992-08-18 Greyhawk Systems, Inc. Apparatus for and method of operation of smectic liquid crystal light valve having scattering centers

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Legal Events

Date Code Title Description
ST Notification of lapse