GB1318007A - Arrangement for locally altering the brightness and or colour of an indicator medium - Google Patents

Arrangement for locally altering the brightness and or colour of an indicator medium

Info

Publication number
GB1318007A
GB1318007A GB2519871*A GB2519871A GB1318007A GB 1318007 A GB1318007 A GB 1318007A GB 2519871 A GB2519871 A GB 2519871A GB 1318007 A GB1318007 A GB 1318007A
Authority
GB
United Kingdom
Prior art keywords
film
voltage
potential
value
liquid crystal
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
GB2519871*A
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
BBC Brown Boveri France SA
Original Assignee
BBC Brown Boveri AG Switzerland
BBC Brown Boveri France 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 BBC Brown Boveri AG Switzerland, BBC Brown Boveri France SA filed Critical BBC Brown Boveri AG Switzerland
Publication of GB1318007A publication Critical patent/GB1318007A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R13/00—Arrangements for displaying electric variables or waveforms
    • G01R13/40—Arrangements for displaying electric variables or waveforms using modulation of a light beam otherwise than by mechanical displacement, e.g. by Kerr effect
    • G01R13/401—Arrangements for displaying electric variables or waveforms using modulation of a light beam otherwise than by mechanical displacement, e.g. by Kerr effect for continuous analogue, or simulated analogue, display
    • G01R13/403—Arrangements for displaying electric variables or waveforms using modulation of a light beam otherwise than by mechanical displacement, e.g. by Kerr effect for continuous analogue, or simulated analogue, display using passive display devices, e.g. liquid crystal display or Kerr effect display devices
    • 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
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Geometry (AREA)
  • Mathematical Physics (AREA)
  • Liquid Crystal (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

1318007 Liquid crystal display devices BROWN BOVERI & CO Ltd 19 April 1971 [26 March 1970] 25198/71 Heading G5C [Also in Divisions G1 and H4] A device for displaying in analogue form the value of an applied voltage V M consists of glass substrates 1 and 2 supporting film electrodes (e.g. tin oxide) 4 and 4<SP>1</SP>, between which is a layer 3 of a liquid crystal medium having an optical characteristic I which shows abrupt variation with potential difference above a threshold value. The film 4<SP>1</SP> has a much greater surface resistivity than the film 4, and opposite ends are connected to earth and to a fixed potential V 2 respectively, so that the potential distribution has the form shown in Fig. 3(a). To the conductive film 4 is applied a fixed potential V T plus the voltage V M , giving a potential distribution across film 4 as shown for two values of V M in Fig. 3(c). The material 3 is such that for a threshold voltage U T , I abruptly changes; thus all the material with x < x M (Fig. 3(d)) will, for an applied voltage V M , have a value of I considerably different from that of the material for x > x M . Optionally the voltage V M may be applied to contact 6, Fig. 4 (not shown), or the potential on one film may vary two-dimensionally, Fig. 2 (not shown).
GB2519871*A 1970-03-26 1971-04-19 Arrangement for locally altering the brightness and or colour of an indicator medium Expired GB1318007A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH459970A CH514845A (en) 1970-03-26 1970-03-26 Arrangement for locally changing the brightness and / or color of a display layer by means of a control voltage

Publications (1)

Publication Number Publication Date
GB1318007A true GB1318007A (en) 1973-05-23

Family

ID=4279092

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2519871*A Expired GB1318007A (en) 1970-03-26 1971-04-19 Arrangement for locally altering the brightness and or colour of an indicator medium

Country Status (6)

Country Link
CA (1) CA944459A (en)
CH (1) CH514845A (en)
DE (1) DE2032023C3 (en)
FR (1) FR2085063A5 (en)
GB (1) GB1318007A (en)
NL (1) NL7006757A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4121153A (en) * 1976-12-03 1978-10-17 Xerox Corporation Tapered resistor meter
US4126824A (en) * 1977-04-21 1978-11-21 Xerox Corporation Progressively shorted tapered resistance device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1399371A (en) * 1972-03-15 1975-07-02 Int Computers Ltd Image display apparatus

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL270450A (en) * 1960-09-09 1900-01-01
US3296530A (en) * 1962-09-28 1967-01-03 Lockheed Aircraft Corp Voltage controlled electroluminescent meter display

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4121153A (en) * 1976-12-03 1978-10-17 Xerox Corporation Tapered resistor meter
US4126824A (en) * 1977-04-21 1978-11-21 Xerox Corporation Progressively shorted tapered resistance device

Also Published As

Publication number Publication date
FR2085063A5 (en) 1971-12-17
DE2032023B2 (en) 1972-12-21
CH514845A (en) 1971-10-31
DE2032023A1 (en) 1971-10-07
DE2032023C3 (en) 1982-01-07
NL7006757A (en) 1971-09-28
CA944459A (en) 1974-03-26

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee