GB2020075A - Liquid crystal display systems - Google Patents

Liquid crystal display systems

Info

Publication number
GB2020075A
GB2020075A GB7907023A GB7907023A GB2020075A GB 2020075 A GB2020075 A GB 2020075A GB 7907023 A GB7907023 A GB 7907023A GB 7907023 A GB7907023 A GB 7907023A GB 2020075 A GB2020075 A GB 2020075A
Authority
GB
United Kingdom
Prior art keywords
signal
liquid crystal
shows
column
timing signals
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Withdrawn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
GB7907023A
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.)
Suwa Seikosha KK
Original Assignee
Suwa Seikosha KK
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 JP2390578A external-priority patent/JPS54139394A/en
Priority claimed from JP3367978A external-priority patent/JPS54133032A/en
Application filed by Suwa Seikosha KK filed Critical Suwa Seikosha KK
Publication of GB2020075A publication Critical patent/GB2020075A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3622—Control of matrices with row and column drivers using a passive matrix
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/06—Details of flat display driving waveforms

Landscapes

  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

In a liquid crystal matrix display system, in which the dielectric anisotropy is positive below a critical frequency fc lying within a range from 30Hz to 30KHz and is negative above fc, two- frequency matrix-addressing is effected by a high frequency fH above fc and a low frequency fL below fc, fL or a multiple being synchronized with an addressing timing signal. R1 to R8 show the timing signals of the 1st to 8th rows; C1 shows a first column data signal and its phase with the IH ON waves A1 to A8 and B1 to B8 OFF waves; F11 shows an OFF signal across a cell in the first row and column; and F81 shows an ON signal across a cell in the eighth row and the first column. Alternatively the timing signals may be synchronized with fH or submultiple, or ON and OFF timing signals and data signal may be not all equal in voltage. <IMAGE>
GB7907023A 1978-03-01 1979-02-28 Liquid crystal display systems Withdrawn GB2020075A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2390578A JPS54139394A (en) 1978-03-01 1978-03-01 Liquid crystal display device
JP3367978A JPS54133032A (en) 1978-03-24 1978-03-24 Liquid crystal display unit

Publications (1)

Publication Number Publication Date
GB2020075A true GB2020075A (en) 1979-11-07

Family

ID=26361351

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7907023A Withdrawn GB2020075A (en) 1978-03-01 1979-02-28 Liquid crystal display systems

Country Status (2)

Country Link
DE (1) DE2907940A1 (en)
GB (1) GB2020075A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4460770A (en) * 1981-06-18 1984-07-17 Hoffmann-La Roche Inc. Liquid crystal mixture
US4609256A (en) * 1981-07-24 1986-09-02 Seiko Epson Corporation Liquid crystal optical device
US5010327A (en) * 1985-09-06 1991-04-23 Matsushita Electric Industrial Co., Ltd. Method of driving a liquid crystal matrix panel
EP1139324A2 (en) * 2000-03-31 2001-10-04 Fujitsu Limited Display apparatus with reduced noise emission and driving method for the display apparatus

Families Citing this family (2)

* 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
US4755812A (en) * 1984-08-31 1988-07-05 Casio Computer Co., Ltd. Method of driving a recording apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4460770A (en) * 1981-06-18 1984-07-17 Hoffmann-La Roche Inc. Liquid crystal mixture
US4609256A (en) * 1981-07-24 1986-09-02 Seiko Epson Corporation Liquid crystal optical device
US5010327A (en) * 1985-09-06 1991-04-23 Matsushita Electric Industrial Co., Ltd. Method of driving a liquid crystal matrix panel
EP1139324A2 (en) * 2000-03-31 2001-10-04 Fujitsu Limited Display apparatus with reduced noise emission and driving method for the display apparatus
EP1139324A3 (en) * 2000-03-31 2003-03-12 Fujitsu Limited Display apparatus with reduced noise emission and driving method for the display apparatus
US7193596B2 (en) 2000-03-31 2007-03-20 Hitachi, Ltd. Display apparatus with reduced noise emission and driving method for display apparatus

Also Published As

Publication number Publication date
DE2907940A1 (en) 1980-01-10

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)