FR2227547A1 - Image converter using a liquid crystal - provides clean septn. of light beams - Google Patents

Image converter using a liquid crystal - provides clean septn. of light beams

Info

Publication number
FR2227547A1
FR2227547A1 FR7315449A FR7315449A FR2227547A1 FR 2227547 A1 FR2227547 A1 FR 2227547A1 FR 7315449 A FR7315449 A FR 7315449A FR 7315449 A FR7315449 A FR 7315449A FR 2227547 A1 FR2227547 A1 FR 2227547A1
Authority
FR
France
Prior art keywords
image
light
liquid crystal
optical barrier
septn
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
FR7315449A
Other languages
French (fr)
Other versions
FR2227547B1 (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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Priority to FR7315449A priority Critical patent/FR2227547A1/en
Publication of FR2227547A1 publication Critical patent/FR2227547A1/en
Application granted granted Critical
Publication of FR2227547B1 publication Critical patent/FR2227547B1/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
    • G02F1/135—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
    • G02F1/133—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
    • G02F1/1351—Light-absorbing or blocking 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
    • G02F1/133—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
    • G02F1/1352—Light-reflecting layers

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)
  • Liquid Crystal (AREA)

Abstract

Image converter comprises a nematic-liquid crystal and a photosensitive element in layers face to face and separated by an optical barrier. The device is exposed from the side of the photosensitive element, to light from an image to be converted and from the other to a beam of light for projection of the image. The appts. includes a source providing a potential difference between conductive layers on the inside faces of glass blocks which retain the assembly. A mosaic of small glass mirros is disposed on the face of the optical barrier in contact with the liquid, to reflect projected light. The optical barrier is made from a series of electrically conductive plugs insulated from each other and each in contact with one end of the small mirrors, and fixed at the other end to the photosensitive element. They are embedded in an insulating body forming the rest of the optical barrier between the plugs. The liquid crystal is retained in the cavity by stoppers. Septn. of the light beams is effected cleanly so that the image projected is an exact replica of the image received without distortion due to extraneous light.
FR7315449A 1973-04-27 1973-04-27 Image converter using a liquid crystal - provides clean septn. of light beams Granted FR2227547A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7315449A FR2227547A1 (en) 1973-04-27 1973-04-27 Image converter using a liquid crystal - provides clean septn. of light beams

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7315449A FR2227547A1 (en) 1973-04-27 1973-04-27 Image converter using a liquid crystal - provides clean septn. of light beams

Publications (2)

Publication Number Publication Date
FR2227547A1 true FR2227547A1 (en) 1974-11-22
FR2227547B1 FR2227547B1 (en) 1978-06-30

Family

ID=9118611

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7315449A Granted FR2227547A1 (en) 1973-04-27 1973-04-27 Image converter using a liquid crystal - provides clean septn. of light beams

Country Status (1)

Country Link
FR (1) FR2227547A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2360953A1 (en) * 1976-04-26 1978-03-03 Izon Corp LIGHT AMPLIFIER DEVICE
FR2460493A1 (en) * 1979-07-02 1981-01-23 Kishinevsky G Unive Electro-optical transducer with semi-transparent electrodes - uses dielectric mirror to separate write elements from read elements
US4440473A (en) * 1980-10-31 1984-04-03 Fuji Xerox Co., Ltd. Voltage polarity switching means for cholesteric liquid crystal displays
WO1987000643A1 (en) * 1985-07-25 1987-01-29 Hughes Aircraft Company Reflective matrix mirror visible to infrared converter light valve
US4828366A (en) * 1987-12-07 1989-05-09 The Mead Corporation Laser-addressable liquid crystal cell having mark positioning layer
US4842376A (en) * 1985-07-25 1989-06-27 Hughes Aircraft Company Double-schottky diode liquid crystal light valve
US4881110A (en) * 1985-07-25 1989-11-14 Hughes Aircraft Company Double-Schottky diode liquid crystal light valve
FR2696875A1 (en) * 1992-10-13 1994-04-15 Thomson Csf Infra-red to visible light image conversion appts. - uses pyro-electric detection connected to opto-electronic liquid crystal display.

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2360953A1 (en) * 1976-04-26 1978-03-03 Izon Corp LIGHT AMPLIFIER DEVICE
FR2460493A1 (en) * 1979-07-02 1981-01-23 Kishinevsky G Unive Electro-optical transducer with semi-transparent electrodes - uses dielectric mirror to separate write elements from read elements
US4440473A (en) * 1980-10-31 1984-04-03 Fuji Xerox Co., Ltd. Voltage polarity switching means for cholesteric liquid crystal displays
WO1987000643A1 (en) * 1985-07-25 1987-01-29 Hughes Aircraft Company Reflective matrix mirror visible to infrared converter light valve
US4842376A (en) * 1985-07-25 1989-06-27 Hughes Aircraft Company Double-schottky diode liquid crystal light valve
US4881110A (en) * 1985-07-25 1989-11-14 Hughes Aircraft Company Double-Schottky diode liquid crystal light valve
US4973136A (en) * 1985-07-25 1990-11-27 Hughes Aircraft Company Reflective matrix mirror visible to infrared converter light valve
US4828366A (en) * 1987-12-07 1989-05-09 The Mead Corporation Laser-addressable liquid crystal cell having mark positioning layer
FR2696875A1 (en) * 1992-10-13 1994-04-15 Thomson Csf Infra-red to visible light image conversion appts. - uses pyro-electric detection connected to opto-electronic liquid crystal display.

Also Published As

Publication number Publication date
FR2227547B1 (en) 1978-06-30

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Legal Events

Date Code Title Description
ST Notification of lapse