FR2379127A1 - Donor-acceptor-type liquid crystal display device and application of this device - Google Patents

Donor-acceptor-type liquid crystal display device and application of this device

Info

Publication number
FR2379127A1
FR2379127A1 FR7720177A FR7720177A FR2379127A1 FR 2379127 A1 FR2379127 A1 FR 2379127A1 FR 7720177 A FR7720177 A FR 7720177A FR 7720177 A FR7720177 A FR 7720177A FR 2379127 A1 FR2379127 A1 FR 2379127A1
Authority
FR
France
Prior art keywords
crystal display
guest
host liquid
acceptor
donor
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.)
Withdrawn
Application number
FR7720177A
Other languages
French (fr)
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.)
BBC Brown Boveri AG Switzerland
Original Assignee
BBC Brown Boveri AG Switzerland
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 BBC Brown Boveri AG Switzerland filed Critical BBC Brown Boveri AG Switzerland
Publication of FR2379127A1 publication Critical patent/FR2379127A1/en
Withdrawn legal-status Critical Current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
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G9/00—Visual time or date indication means
    • G04G9/0023—Visual time or date indication means by light valves in general
    • G04G9/0029—Details
    • G04G9/0047—Details electrical, e.g. selection or application of the operating voltage

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Electric Clocks (AREA)
  • Liquid Crystal Substances (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

An electronic clock with a guest-host liquid-crystal display is described. The specified drive electronics subject the guest-host liquid-crystal display to frequencies in excess of 32 Hz, preferably about 1 Hz. As a result, the power consumption of the guest-host liquid-crystal display is reduced to such an extent that there is no need for the previously used complex twisted nematic cell. Apart from the price advantage, the elimination of the previously necessary polarisers allows the proposed guest-host liquid-crystal cell to have a greater viewing angle for the display.
FR7720177A 1977-01-31 1977-06-30 Donor-acceptor-type liquid crystal display device and application of this device Withdrawn FR2379127A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH112477A CH619590GA3 (en) 1977-01-31 1977-01-31 Liquid-crystal display device of the guest-host effect type and use of this liquid-crystal display device

Publications (1)

Publication Number Publication Date
FR2379127A1 true FR2379127A1 (en) 1978-08-25

Family

ID=4203046

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7720177A Withdrawn FR2379127A1 (en) 1977-01-31 1977-06-30 Donor-acceptor-type liquid crystal display device and application of this device

Country Status (6)

Country Link
JP (1) JPS5396863A (en)
CH (1) CH619590GA3 (en)
DE (1) DE2707671A1 (en)
FR (1) FR2379127A1 (en)
GB (1) GB1595842A (en)
NL (1) NL7801018A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0550384A1 (en) * 1991-12-31 1993-07-07 Xelux Holding Ag Ante-glare device
US5444232A (en) * 1993-05-14 1995-08-22 Xelux Ag Antiglare device to protect eyes during welding and immediately thereafter for a time based on the intensity and duration of the welding light

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4386350A (en) * 1979-06-26 1983-05-31 Nippon Electric Co., Ltd. Display apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0550384A1 (en) * 1991-12-31 1993-07-07 Xelux Holding Ag Ante-glare device
US5444232A (en) * 1993-05-14 1995-08-22 Xelux Ag Antiglare device to protect eyes during welding and immediately thereafter for a time based on the intensity and duration of the welding light

Also Published As

Publication number Publication date
GB1595842A (en) 1981-08-19
JPS5396863A (en) 1978-08-24
CH619590B (en)
DE2707671A1 (en) 1978-08-03
CH619590GA3 (en) 1980-10-15
NL7801018A (en) 1978-08-02

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Legal Events

Date Code Title Description
ST Notification of lapse