FR2139041A1 - Liquid crystal display matrix - with automatic blanking for non-addressed cross points - Google Patents

Liquid crystal display matrix - with automatic blanking for non-addressed cross points

Info

Publication number
FR2139041A1
FR2139041A1 FR7218693A FR7218693A FR2139041A1 FR 2139041 A1 FR2139041 A1 FR 2139041A1 FR 7218693 A FR7218693 A FR 7218693A FR 7218693 A FR7218693 A FR 7218693A FR 2139041 A1 FR2139041 A1 FR 2139041A1
Authority
FR
France
Prior art keywords
liquid crystal
automatic blanking
cross points
crystal display
addressed
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.)
Granted
Application number
FR7218693A
Other languages
French (fr)
Other versions
FR2139041B1 (en
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconi Co Ltd
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 Marconi Co Ltd filed Critical Marconi Co Ltd
Publication of FR2139041A1 publication Critical patent/FR2139041A1/en
Application granted granted Critical
Publication of FR2139041B1 publication Critical patent/FR2139041B1/fr
Granted 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

Abstract

The matrix is a liquid crystal cell with conventional parallel sets of strip elements on opposite faces and at right angles. Column electrodes are connected via switches to a reference potential and row electrodes via further switches to the excitation supply voltage so that when one switch of each set is closed, the relevant cross point is addressed and energized using esp. d.c. or low frequency a.c. exciation. Also applied to the row electrodes via coupling capacitors is an a.c. voltage at a frequency above that which excites the crystal material into optical change and this provides automatic blanking of nonselected cross points to improve resolution by preventing shunt excitation.
FR7218693A 1971-05-25 1972-05-25 Liquid crystal display matrix - with automatic blanking for non-addressed cross points Granted FR2139041A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1685971 1971-05-25

Publications (2)

Publication Number Publication Date
FR2139041A1 true FR2139041A1 (en) 1973-01-05
FR2139041B1 FR2139041B1 (en) 1976-11-19

Family

ID=10084984

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7218693A Granted FR2139041A1 (en) 1971-05-25 1972-05-25 Liquid crystal display matrix - with automatic blanking for non-addressed cross points

Country Status (2)

Country Link
DE (1) DE2225107A1 (en)
FR (1) FR2139041A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2230410A1 (en) * 1973-05-24 1974-12-20 Commissariat Energie Atomique Control of molecular orientation in liq. crystals - by applying electric field at varying frequencies
EP0000594A1 (en) * 1977-07-29 1979-02-07 BBC Aktiengesellschaft Brown, Boveri & Cie. Electro-optical display device and method for operating same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5720636B2 (en) * 1973-03-27 1982-04-30

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2230410A1 (en) * 1973-05-24 1974-12-20 Commissariat Energie Atomique Control of molecular orientation in liq. crystals - by applying electric field at varying frequencies
EP0000594A1 (en) * 1977-07-29 1979-02-07 BBC Aktiengesellschaft Brown, Boveri & Cie. Electro-optical display device and method for operating same

Also Published As

Publication number Publication date
DE2225107A1 (en) 1972-12-07
FR2139041B1 (en) 1976-11-19

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Legal Events

Date Code Title Description
ST Notification of lapse