ES418985A1 - Operational method for displaying images with liquid crystal electro optical devices and apparatus therefor - Google Patents

Operational method for displaying images with liquid crystal electro optical devices and apparatus therefor

Info

Publication number
ES418985A1
ES418985A1 ES418985A ES418985A ES418985A1 ES 418985 A1 ES418985 A1 ES 418985A1 ES 418985 A ES418985 A ES 418985A ES 418985 A ES418985 A ES 418985A ES 418985 A1 ES418985 A1 ES 418985A1
Authority
ES
Spain
Prior art keywords
liquid crystal
impulse
cell
peak
interposed
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
ES418985A
Other languages
Spanish (es)
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.)
BARZILAI OTTAVI MALTESE
Original Assignee
BARZILAI OTTAVI MALTESE
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 BARZILAI OTTAVI MALTESE filed Critical BARZILAI OTTAVI MALTESE
Publication of ES418985A1 publication Critical patent/ES418985A1/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
    • G02F1/137—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
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells

Abstract

Method with its corresponding device for the presentation of images in which the electro-optical device comprises at least one liquid crystal cell interposed between two polarizers, in which between two supports, of which at least one is transparent and provided with electrodic conductive layers, a veil of small thickness of nematic liquid crystal is interposed to negative dielectric anisotropy and to substantially homeotropic alignment, characterized by the fact that, depending on the physical characteristics of the liquid crystal and the thickness of the layer, the liquid crystal it applies an impulse excitation, each impulse being made up of any voltage waveform, such as not to cause dielectric breakdown and which, in correspondence to the target level, has an effective duration and amplitude such as to give rise, in conditions of a single applied impulse, to a light response of the cell and not s 1.3 times higher than those needed to produce a beam of light with a peak amplitude that cannot be further increased without the appearance of more than one peak, the repetition period of the pulses being such, in case of repeated excitation, that, in stationary conditions, at the end of the period itself, the luminous response of said cell that corresponds to the level of the target falls irreversibly to a value not exceeding one half of its peak value. (Machine-translation by Google Translate, not legally binding)
ES418985A 1972-09-22 1973-09-21 Operational method for displaying images with liquid crystal electro optical devices and apparatus therefor Expired ES418985A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT52916/72A IT965475B (en) 1972-09-22 1972-09-22 IMPROVEMENT IN THE SCREENS FOR THE PRESENTATION OF IMAGES OF THE LIQUID CRYSTAL TYPE SUITABLE IN PARTICULAR FOR TELEVISION IMAGES AND ALPHANUMERIC DATA

Publications (1)

Publication Number Publication Date
ES418985A1 true ES418985A1 (en) 1976-03-01

Family

ID=11278489

Family Applications (1)

Application Number Title Priority Date Filing Date
ES418985A Expired ES418985A1 (en) 1972-09-22 1973-09-21 Operational method for displaying images with liquid crystal electro optical devices and apparatus therefor

Country Status (14)

Country Link
JP (1) JPS4971952A (en)
AR (1) AR206687A1 (en)
AU (1) AU6048773A (en)
BE (1) BE805180A (en)
BR (1) BR7307361D0 (en)
CA (1) CA1003528A (en)
CH (1) CH577181A5 (en)
DE (1) DE2346732A1 (en)
ES (1) ES418985A1 (en)
FR (1) FR2201005A5 (en)
GB (1) GB1451076A (en)
IL (1) IL43290A (en)
IT (1) IT965475B (en)
NL (1) NL7313049A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2292253A1 (en) * 1974-11-21 1976-06-18 Thomson Csf METHOD AND DEVICE USING A THERMO-OPTICAL EFFECT IN A LIQUID CRYSTAL FOR THE REPRODUCTION OF IMAGES IN REAL TIME AND WITHOUT MEMORY
JPS5164899A (en) * 1974-12-03 1976-06-04 Nippon Electric Co EKISHOHYOJISOCHI
US4006968A (en) * 1975-05-02 1977-02-08 Hughes Aircraft Company Liquid crystal dot color display
FR2389955B1 (en) * 1977-05-05 1981-12-04 Thomson Csf
DE3169810D1 (en) * 1980-07-28 1985-05-15 Bbc Brown Boveri & Cie Homeotropic nematic display with an internal reflector
CH661361A5 (en) * 1983-12-16 1987-07-15 Bbc Brown Boveri & Cie Multiplexable liquid-crystal display
JPS62203126A (en) * 1986-03-04 1987-09-07 Matsushita Electric Ind Co Ltd Display device
JP2586195B2 (en) * 1990-08-30 1997-02-26 セイコーエプソン株式会社 Liquid crystal display

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3655269A (en) * 1971-01-25 1972-04-11 Rca Corp Liquid crystal display assembly having independent contrast and speed of response controls

Also Published As

Publication number Publication date
AU6048773A (en) 1975-03-20
JPS4971952A (en) 1974-07-11
DE2346732A1 (en) 1974-04-04
AR206687A1 (en) 1976-08-13
FR2201005A5 (en) 1974-04-19
BR7307361D0 (en) 1974-08-29
GB1451076A (en) 1976-09-29
IL43290A0 (en) 1973-11-28
IT965475B (en) 1974-01-31
IL43290A (en) 1976-12-31
CA1003528A (en) 1977-01-11
CH577181A5 (en) 1976-06-30
BE805180A (en) 1974-01-16
NL7313049A (en) 1974-03-26

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