CH646564GA3 - - Google Patents

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Publication number
CH646564GA3
CH646564GA3 CH1318878A CH1318878A CH646564GA3 CH 646564G A3 CH646564G A3 CH 646564GA3 CH 1318878 A CH1318878 A CH 1318878A CH 1318878 A CH1318878 A CH 1318878A CH 646564G A3 CH646564G A3 CH 646564GA3
Authority
CH
Switzerland
Prior art keywords
composition
liquid crystal
frequency
output
display element
Prior art date
Application number
CH1318878A
Other languages
French (fr)
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
Priority claimed from JP16084477A external-priority patent/JPS5490994A/en
Priority claimed from JP15931077A external-priority patent/JPS5492195A/en
Application filed filed Critical
Publication of CH646564GA3 publication Critical patent/CH646564GA3/fr

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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
    • G02F1/1392—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 using a field-induced sign-reversal of the dielectric anisotropy

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

A liquid crystal display device includes a display element containing a liquid crystal display composition for operating in the twisted nematic mode and a two-frequency matrix-addressing circuit for driving the display element. The liquid crystal composition has a critical frequency fc such that at lower frequencies, the dielectric anisotropy of said composition is positive and at higher frequencies is negative, fc lying between the low frequency and high frequency components in the output of said circuit. The arrangement of the device is such that a selected picture cell in said display element can be turned off by applying the high frequency component of said output. Other embodiments include a device in which a dichroic dye is incorporated in the composition and an embodiment which contains means for detecting the temperature of the liquid crystal composition. The effect of temperature change on the performance of the device is compensated by changing the frequency of one of the components or by changing the voltage of the output from the circuit.
CH1318878A 1977-12-27 1978-12-27 CH646564GA3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP16084477A JPS5490994A (en) 1977-12-27 1977-12-27 Liquid crystal display unit
JP15931077A JPS5492195A (en) 1977-12-29 1977-12-29 Liquid crystal display unit

Publications (1)

Publication Number Publication Date
CH646564GA3 true CH646564GA3 (en) 1984-12-14

Family

ID=26486154

Family Applications (1)

Application Number Title Priority Date Filing Date
CH1318878A CH646564GA3 (en) 1977-12-27 1978-12-27

Country Status (4)

Country Link
US (1) US4417785A (en)
CH (1) CH646564GA3 (en)
DE (1) DE2856134A1 (en)
GB (1) GB2013014B (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3140078A1 (en) * 1980-10-08 1982-04-22 Kabushiki Kaisha Suwa Seikosha, Tokyo OPTICAL LIQUID CRYSTAL DEVICE AND PRINTER USING SUCH AN OPTICAL DEVICE AS A LIGHT VALVE
DE3221462A1 (en) * 1981-06-18 1983-01-05 F. Hoffmann-La Roche & Co AG, 4002 Basel LIQUID CRYSTAL MIXTURE
US4655561A (en) * 1983-04-19 1987-04-07 Canon Kabushiki Kaisha Method of driving optical modulation device using ferroelectric liquid crystal
JPS60104925A (en) * 1983-11-14 1985-06-10 Nippon Denso Co Ltd Driving device of liquid crystal element
US4688899A (en) * 1984-07-27 1987-08-25 Casio Computer Co., Ltd. Dual-frequency, dielectric anisotropy liquid crystal display
US4755812A (en) * 1984-08-31 1988-07-05 Casio Computer Co., Ltd. Method of driving a recording apparatus
DE3503958A1 (en) * 1985-02-06 1986-08-07 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Method for operating a liquid crystal twisted cell
GB2173337B (en) * 1985-04-03 1989-01-11 Stc Plc Addressing liquid crystal cells
US4850676A (en) * 1985-07-31 1989-07-25 Seiko Epson Corporation Method for driving a liquid crystal element
EP0214856B1 (en) * 1985-09-06 1992-07-29 Matsushita Electric Industrial Co., Ltd. Method of driving liquid crystal matrix panel
US4848877A (en) * 1987-09-29 1989-07-18 Cambridge Research And Instrumentation, Inc. Liquid crystal devices and systems using such devices
JP3840856B2 (en) * 1999-11-10 2006-11-01 セイコーエプソン株式会社 Liquid crystal panel driving method, liquid crystal device and electronic apparatus
US7758773B2 (en) * 2002-01-10 2010-07-20 Kent State University Non-synthetic method for modifying properties of liquid crystals
JP2005515495A (en) * 2002-01-10 2005-05-26 ケント ステート ユニバーシティ Liquid crystal cell materials
JP5105694B2 (en) * 2003-12-24 2012-12-26 株式会社半導体エネルギー研究所 Display device and electronic device
KR101222987B1 (en) * 2007-05-11 2013-01-17 엘지디스플레이 주식회사 Liquid Crystal Display and Driving Method thereof

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1426896A (en) * 1972-05-30 1976-03-03 Matsushita Electric Ind Co Ltd Liquid crystal display system
US3857629A (en) * 1973-05-14 1974-12-31 Ibm Fast turn-off nematic liquid optical devices
US4009934A (en) * 1974-01-11 1977-03-01 Eastman Kodak Company Electro-optic display devices and methods
US3914022A (en) * 1974-07-02 1975-10-21 Gen Electric Quasi-homeotropic twisted nematic liquid crystal device
US4093356A (en) * 1977-02-14 1978-06-06 General Electric Company Transflective liquid crystal display
GB2010560A (en) * 1977-11-22 1979-06-27 Suwa Seikosha Kk Liquid crystal display arrangements

Also Published As

Publication number Publication date
US4417785A (en) 1983-11-29
DE2856134A1 (en) 1979-06-28
GB2013014A (en) 1979-08-01
GB2013014B (en) 1982-06-30

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