GB1523162A - Liquid crystal displays - Google Patents

Liquid crystal displays

Info

Publication number
GB1523162A
GB1523162A GB583875A GB583875A GB1523162A GB 1523162 A GB1523162 A GB 1523162A GB 583875 A GB583875 A GB 583875A GB 583875 A GB583875 A GB 583875A GB 1523162 A GB1523162 A GB 1523162A
Authority
GB
United Kingdom
Prior art keywords
electrodes
areas
voltage
threshold
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
GB583875A
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.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
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 UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Priority to GB583875A priority Critical patent/GB1523162A/en
Publication of GB1523162A publication Critical patent/GB1523162A/en
Expired 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

1523162 Matrix display DEFENCE SECRETARY OF STATE FOR 27 Jan 1976 [11 Feb 1975] 5838/75 Heading G5C To switch rapidly a liquid crystal matrix display, as in Specification 1,502,280, a highblanking. voltage is applied across all areas to make them transparent (ON), subsequently reduced to a lower sustaining level equal to threshold, after which selected areas are allowed to relax to the opaque (OFF) state by a near zero addressing voltage, the sustaning and near zero voltages being obtained from two square waves V 1 , V 2 both of threshold arms value, 45 degrees apart in phase, so that their difference (Fig. 3, not shown) also has the same r.m.s. value. In a cartesian array, typically 12 Ám. thick, containing nematic with, e.g. 10% cholesteric material between transparent, e.g. SnO 2 , electrodes (Fig. 2, not shown), after the end of the blanking voltage V 1 is applied to all Y electrodes Y 1 , Y 2 , Y 3 while zero voltage is applied to all X electrodes X 1 , X 2 , X 3 to provide sustianing voltage across all areas. Then to convert, e.g. one area x 2 , y 2 to the OFF state, V 2 is applied to both X 2 and Y 2 electrodes, the voltages on all other electrodes remaining unchanged, giving threshold r.m.s. level across all areas except those addressed. Other areas may be addressed in sequence, or by line-byline scanning. Polar and seven-segment arrays may be similarly addressed. The liquid crystal material may contain a dye.
GB583875A 1976-01-27 1976-01-27 Liquid crystal displays Expired GB1523162A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB583875A GB1523162A (en) 1976-01-27 1976-01-27 Liquid crystal displays

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB583875A GB1523162A (en) 1976-01-27 1976-01-27 Liquid crystal displays

Publications (1)

Publication Number Publication Date
GB1523162A true GB1523162A (en) 1978-08-31

Family

ID=9803582

Family Applications (1)

Application Number Title Priority Date Filing Date
GB583875A Expired GB1523162A (en) 1976-01-27 1976-01-27 Liquid crystal displays

Country Status (1)

Country Link
GB (1) GB1523162A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0021436A1 (en) * 1979-06-26 1981-01-07 Nec Corporation Display apparatus
US4392718A (en) * 1980-01-12 1983-07-12 Ferranti Limited (Now Ferranti Plc) Resistive electrode LCD and voltage supply means
GB2156567A (en) * 1984-03-30 1985-10-09 Nat Res Dev A flat-panel display

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0021436A1 (en) * 1979-06-26 1981-01-07 Nec Corporation Display apparatus
US4392718A (en) * 1980-01-12 1983-07-12 Ferranti Limited (Now Ferranti Plc) Resistive electrode LCD and voltage supply means
GB2156567A (en) * 1984-03-30 1985-10-09 Nat Res Dev A flat-panel display

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee