GB1521724A - Colour images teleprojection and telereproduction device - Google Patents

Colour images teleprojection and telereproduction device

Info

Publication number
GB1521724A
GB1521724A GB36751/75A GB3675175A GB1521724A GB 1521724 A GB1521724 A GB 1521724A GB 36751/75 A GB36751/75 A GB 36751/75A GB 3675175 A GB3675175 A GB 3675175A GB 1521724 A GB1521724 A GB 1521724A
Authority
GB
United Kingdom
Prior art keywords
images
cell
layer
electrodes
recorded
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
GB36751/75A
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.)
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
Publication of GB1521724A publication Critical patent/GB1521724A/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
    • G02F1/132—Thermal activation of liquid crystals exhibiting a thermo-optic effect
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H04N9/3105—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators

Landscapes

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

Abstract

1521724 Modulating light THOMSON-CSF 5 Sept 1975 [6 Sept 1974] 36751/75 Heading G2F [Also in Division H4] A device for projecting colour images transmitted over a distance by a video signal, comprises a display cell 2 including a layer 25 of liquid crystal material in a smectic phase, an infrared laser 10 for providing a recording spot, said recording spot scanning layer 25 for producing at its point of impact a transitory conversion of said material from said smectic phase to the isotropicphase, a light source 30 for directing a parallel beam 3 of white light on to cell 2, a control element 4 for receiving said video signal, supplying synchronization pulses to laser 10, and applying three chrominance signals to a pair of electrodes 23, 24 sandwiching layer 25, three chrominance images being thereby recorded in cell 2 in the form of local variations in the scattering effect of layer 25 and providing from beam 3, three beams 3R, 3V, 3B, the three beams being filtered for selecting in each beam a respective spectral band and combined into a single beam by means of four dichroic mirrors 32-35, and a screen 5 for receiving colour images. In a modification, the chrominance signals are applied to a modulator 15 to modulate the intensity of the beam from laser 10, electrodes 23, 24 being discarded. In a further embodiment, Fig. 4 (not shown), three display cells are used, each cell recording one of the three trichromic components of the image to be reproduced, the three images being recorded simultaneously. When the chrominance signals are applied to electrodes of the display cells, the images recorded therein may be erased by an erasing pulse supplied by the control device. If successive images are transmitted one after the other, the erasing pulse may be controlled by the image synchronizing pulse. The three cells may be illuminated by three flashlights which are turned on simultaneously also by the image synchronizing pulses. The screen 5 may be replaced by a trichromatic photo-sensitive emulsion.
GB36751/75A 1974-09-06 1975-09-05 Colour images teleprojection and telereproduction device Expired GB1521724A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7430335A FR2284237A1 (en) 1974-09-06 1974-09-06 COLOR IMAGE TELEPROJECTION AND TELEPROGRAPHY DEVICE

Publications (1)

Publication Number Publication Date
GB1521724A true GB1521724A (en) 1978-08-16

Family

ID=9142852

Family Applications (1)

Application Number Title Priority Date Filing Date
GB36751/75A Expired GB1521724A (en) 1974-09-06 1975-09-05 Colour images teleprojection and telereproduction device

Country Status (4)

Country Link
JP (2) JPS5152233A (en)
DE (1) DE2539651C2 (en)
FR (1) FR2284237A1 (en)
GB (1) GB1521724A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2116805A (en) * 1982-02-18 1983-09-28 Casio Computer Co Ltd A liquid crystal television receiver
GB2191057A (en) * 1986-05-19 1987-12-02 Philips Electronic Associated Colour video display arrangement
GB2227904A (en) * 1989-01-31 1990-08-08 Gold Star Co Apparatus for displaying a video signal and recording the displayed image

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4291948A (en) * 1977-11-10 1981-09-29 International Standard Electric Corporation Liquid crystal display incorporating positive and negative smectic material
FR2466071A1 (en) * 1979-09-21 1981-03-27 Thomson Csf DEVICE FOR PROJECTING COLOR IMAGES ON A SCREEN, AND VISUALIZATION SYSTEM COMPRISING SUCH A DEVICE
EP0087477B1 (en) * 1981-09-07 1988-11-30 Sony Corporation Liquid crystal display device
JPS59171472U (en) * 1983-04-28 1984-11-16 パイオニア株式会社 video projector
JPS59230383A (en) * 1983-06-14 1984-12-24 Seiko Epson Corp Projection television system
JPS603291A (en) * 1983-06-21 1985-01-09 Seiko Epson Corp Projective liquid crystal display device
JPS60179723A (en) * 1984-02-27 1985-09-13 Sharp Corp Liquid crystal projection device
US4613207A (en) * 1984-05-08 1986-09-23 Manchester R & D Partnership Liquid crystal projector and method
JPS6113885A (en) * 1984-06-29 1986-01-22 Sony Corp Projecting type picture image display device
JPS6113223A (en) * 1984-06-29 1986-01-21 Nec Corp Liquid crystal light bulb for color thermal writing
JPS6132815A (en) * 1984-07-25 1986-02-15 Nec Corp Thermal writing liquid crystal light valve
USRE36725E (en) * 1984-10-22 2000-06-06 Seiko Epson Corporation Projection-type display device
JPH0628460B2 (en) * 1984-10-25 1994-04-13 ソニー株式会社 Projection display device
DE3531502C2 (en) * 1985-09-04 1993-12-16 Sel Alcatel Ag Image display device for color imaging of a video image transmitted by primary color signals
JPH0644808B2 (en) * 1985-11-07 1994-06-08 川崎重工業株式会社 LCD panel structure for projection
JPH01113724A (en) * 1987-10-27 1989-05-02 Seiko Instr & Electron Ltd Liquid crystal light valve
JPH02101681U (en) * 1989-01-30 1990-08-13
JP2754031B2 (en) * 1989-03-03 1998-05-20 セイコーエプソン株式会社 Projection type liquid crystal display
US5124545A (en) * 1989-03-23 1992-06-23 Victor Company Of Japan, Ltd. Light-to-light conversion element provided with wavelength selecting reflection layer and imaging device provided with the light-to-light conversion element
JPH0664271B2 (en) * 1989-09-13 1994-08-22 セイコーエプソン株式会社 Projection type color display
US5267029A (en) * 1989-12-28 1993-11-30 Katsumi Kurematsu Image projector
FR2669440B1 (en) * 1990-11-21 1994-08-26 Sextant Avionique COLOR PROJECTION VIEWING DEVICE USING OPTICAL VALVES.
JPH0734076B2 (en) * 1993-02-18 1995-04-12 セイコーエプソン株式会社 LCD projection device
JP2606619B2 (en) * 1995-12-26 1997-05-07 セイコーエプソン株式会社 Projection display device
JP2746263B2 (en) * 1996-06-17 1998-05-06 セイコーエプソン株式会社 Color display

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2129368A1 (en) * 1971-06-14 1972-12-21 Herrmann Appbau Gmbh Method and device for the production of a reproducible colored picture from three black and white partial colors
FR2174706B1 (en) * 1972-03-08 1978-03-03 Commissariat Energie Atomique
US3796999A (en) * 1972-10-19 1974-03-12 Bell Telephone Labor Inc Locally erasable thermo-optic smectic liquid crystal storage displays

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2116805A (en) * 1982-02-18 1983-09-28 Casio Computer Co Ltd A liquid crystal television receiver
US4562478A (en) * 1982-02-18 1985-12-31 Casio Computer Co., Ltd. Liquid crystal television receiver
GB2191057A (en) * 1986-05-19 1987-12-02 Philips Electronic Associated Colour video display arrangement
GB2227904A (en) * 1989-01-31 1990-08-08 Gold Star Co Apparatus for displaying a video signal and recording the displayed image
GB2227904B (en) * 1989-01-31 1993-07-07 Gold Star Co Apparatus for displaying and recording an image

Also Published As

Publication number Publication date
FR2284237A1 (en) 1976-04-02
DE2539651C2 (en) 1983-09-01
FR2284237B1 (en) 1981-06-26
JPS5152233A (en) 1976-05-08
DE2539651A1 (en) 1976-03-18
JPS58111580U (en) 1983-07-29

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Legal Events

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