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GB1373894A - Colour television system which utilizes liquid crystal filters - Google Patents

Colour television system which utilizes liquid crystal filters

Info

Publication number
GB1373894A
GB1373894A GB954573A GB954573A GB1373894A GB 1373894 A GB1373894 A GB 1373894A GB 954573 A GB954573 A GB 954573A GB 954573 A GB954573 A GB 954573A GB 1373894 A GB1373894 A GB 1373894A
Authority
GB
United Kingdom
Prior art keywords
colour
liquid crystal
colours
camera
television
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
GB954573A
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
Publication of GB1373894A publication Critical patent/GB1373894A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/16—Picture reproducers using cathode ray tubes
    • H04N9/22—Picture reproducers using cathode ray tubes using the same beam for more than one primary colour information
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00—Colour television systems
    • H04N11/06—Transmission systems characterised by the manner in which the individual colour picture signal components are combined
    • H04N11/20—Conversion of the manner in which the individual colour picture signal components are combined, e.g. conversion of colour television standards
    • H04N11/22—Conversion of the manner in which the individual colour picture signal components are combined, e.g. conversion of colour television standards in which simultaneous signals are converted into sequential signals or vice versa
    • 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
    • G02F2203/00—Function characteristic
    • G02F2203/34—Colour display without the use of colour mosaic filters

Landscapes

  • Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Engineering & Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Color Television Image Signal Generators (AREA)

Abstract

1373894 Colour television COMMISSARIAT A L'ENERGIE ATOMIQUE 27 Feb 1973 [8 March 1972] 9545/73 Heading H4F Field, frame or line sequential colour television arrangement in which a liquid crystal cell 2 is disposed between crossed polarizers 4 and 6 between an object 30 and a television camera tube 32 (e.g. a vidicon), and/or between a CRT display tube 56 and a viewer 58. The cell comprises nematic liquid crystal material, e.g. pmethoxybenzylidene-p<SP>1</SP>-n-butylaniline, between two glass plates carrying transparent plane conductors between which a D.C. or A.C. voltage is applied which has a magnitude which varies at the field, frame or line rates so that sequential colour components, e.g. red, green and blue, are picked-up by the camera 32 or viewed at the display i.e. the refractive index of the liquid crystal material is cyclically varied so that different colours are cyclically passed by the analyser 6 or 6<SP>1</SP>. The three colour signals are preferably weighted at the camera before transmission so that they may be correctly viewed on a monochrome receiver, e.g. 0À3R, 0À59R and 0À11B are transmitted, a colour receiver including the liquid crystal cell restoring the colour signal amplitude before display. The colour images may be projected on to a large screen and more than three colours may be used or the colours selected may be different for different zones of the image.
GB954573A 1972-03-08 1973-02-27 Colour television system which utilizes liquid crystal filters Expired GB1373894A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7207976A FR2174706B1 (en) 1972-03-08 1972-03-08

Publications (1)

Publication Number Publication Date
GB1373894A true GB1373894A (en) 1974-11-13

Family

ID=9094818

Family Applications (1)

Application Number Title Priority Date Filing Date
GB954573A Expired GB1373894A (en) 1972-03-08 1973-02-27 Colour television system which utilizes liquid crystal filters

Country Status (5)

Country Link
JP (1) JPS491132A (en)
DE (1) DE2311548A1 (en)
FR (1) FR2174706B1 (en)
GB (1) GB1373894A (en)
IT (1) IT980502B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2277654A (en) * 1993-04-27 1994-11-02 Yang Tai Her Colour TV system

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2284237A1 (en) * 1974-09-06 1976-04-02 Thomson Csf COLOR IMAGE TELEPROJECTION AND TELEPROGRAPHY DEVICE
DE2452392A1 (en) * 1974-11-05 1976-05-06 Licentia Gmbh Reproduction system for colour images - involves cathode-ray tube with only one electron beam and optical filter arrangement
JPS5378940A (en) * 1976-12-23 1978-07-12 Nippon Electric Co Partial plating method
JPS53122631A (en) * 1977-03-31 1978-10-26 Sumitomo Metal Ind Ltd Method of and device for continuous electroplating one surface of strip
GB2034900B (en) * 1978-11-17 1982-10-20 Marconi Instruments Ltd Spectrum analyser
JPH0244303Y2 (en) * 1979-01-29 1990-11-26
JPS5897022A (en) * 1981-12-04 1983-06-09 Yokogawa Hokushin Electric Corp Color optical modulator
US4635051A (en) * 1983-09-26 1987-01-06 Tektronix, Inc. High-speed electro-optical light gate and field sequential full color display system incorporating same
US4613207A (en) * 1984-05-08 1986-09-23 Manchester R & D Partnership Liquid crystal projector and method
JPH0466692A (en) * 1990-07-06 1992-03-03 Nippon Avionics Co Ltd Method for plating one side surface of metal plate and holding table

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2277654A (en) * 1993-04-27 1994-11-02 Yang Tai Her Colour TV system
GB2277654B (en) * 1993-04-27 1997-12-03 Yang Tai Her Colour television system

Also Published As

Publication number Publication date
IT980502B (en) 1974-10-10
JPS491132A (en) 1974-01-08
FR2174706A1 (en) 1973-10-19
DE2311548A1 (en) 1973-09-27
FR2174706B1 (en) 1978-03-03

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Legal Events

Date Code Title Description
CSNS Application of which complete specification have been accepted and published, but patent is not sealed