GB2004679A - Liquid crystal matrix display - Google Patents

Liquid crystal matrix display

Info

Publication number
GB2004679A
GB2004679A GB7833762A GB7833762A GB2004679A GB 2004679 A GB2004679 A GB 2004679A GB 7833762 A GB7833762 A GB 7833762A GB 7833762 A GB7833762 A GB 7833762A GB 2004679 A GB2004679 A GB 2004679A
Authority
GB
United Kingdom
Prior art keywords
liquid crystal
electrodes
state
receive
cell
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
GB7833762A
Other versions
GB2004679B (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.)
Secretary of State for Defence Canada
UK Secretary of State for Defence
Original Assignee
Secretary of State for Defence Canada
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 Secretary of State for Defence Canada, UK Secretary of State for Defence filed Critical Secretary of State for Defence Canada
Priority to GB7833762A priority Critical patent/GB2004679B/en
Publication of GB2004679A publication Critical patent/GB2004679A/en
Application granted granted Critical
Publication of GB2004679B publication Critical patent/GB2004679B/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
    • G09G3/3629—Control of matrices with row and column drivers using a passive matrix using liquid crystals having memory effects, e.g. ferroelectric liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0469—Details of the physics of pixel operation
    • G09G2300/0478—Details of the physics of pixel operation related to liquid crystal pixels
    • G09G2300/0482—Use of memory effects in nematic liquid crystals
    • G09G2300/0486—Cholesteric liquid crystals, including chiral-nematic liquid crystals, with transitions between focal conic, planar, and homeotropic states

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

A liquid crystal display comprises a liquid crystal cell having a thin layer of liquid crystal material contained between two glass plates which carry strip addressing electrodes arranged in an X, Y matrix of X times Y electrode intersections or elements. Electric signals are applied sequentially along both the X electrodes and the Y electrodes. The nematic-cholesteric liquid crystal material in the cell changes from an OFF state to an ON state with applied voltages above a threshold level Vc, changes from an ON to an OFF state when a zero voltage is applied, and tends to remain at its existing state when a voltage Vc is applied. In one example X electrodes receive +/- Vc voltages whilst Y electrodes receive in turn the pulse sequence of mVc followed by nVc scanned across the cell in the X direction with zero voltage at other times. Putting m=1, n=2, each element will receive zero volts, if that element is to be turned OFF, or 2Vc followed by 3Vc if that element is to be turned ON, with Vc applied at other times. In general the liquid crystal elements receive voltages of << Vc, Vc, (m + 1)Vc or (n + 1)Vc to show the desired pattern of information where n> 1>/=m>0. <IMAGE>
GB7833762A 1977-09-26 1978-08-17 Matrix addressing liquid crystal display Expired GB2004679B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7833762A GB2004679B (en) 1977-09-26 1978-08-17 Matrix addressing liquid crystal display

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB3990377 1977-09-26
GB7833762A GB2004679B (en) 1977-09-26 1978-08-17 Matrix addressing liquid crystal display

Publications (2)

Publication Number Publication Date
GB2004679A true GB2004679A (en) 1979-04-04
GB2004679B GB2004679B (en) 1982-03-03

Family

ID=26264263

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7833762A Expired GB2004679B (en) 1977-09-26 1978-08-17 Matrix addressing liquid crystal display

Country Status (1)

Country Link
GB (1) GB2004679B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0020027A1 (en) * 1979-05-03 1980-12-10 National Research Development Corporation Apparatus for displaying two waveforms
FR2541807A1 (en) * 1983-02-24 1984-08-31 Commissariat Energie Atomique METHOD FOR SEQUENTIALLY CONTROLLING A MATRIX IMAGER USING THE CHOLESTERIC-NEMATIC PHASE TRANSITION EFFECT OF A LIQUID CRYSTAL
GB2172780A (en) * 1985-03-18 1986-09-24 Shinetsu Polymer Co Transparent electrode element

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0020027A1 (en) * 1979-05-03 1980-12-10 National Research Development Corporation Apparatus for displaying two waveforms
FR2541807A1 (en) * 1983-02-24 1984-08-31 Commissariat Energie Atomique METHOD FOR SEQUENTIALLY CONTROLLING A MATRIX IMAGER USING THE CHOLESTERIC-NEMATIC PHASE TRANSITION EFFECT OF A LIQUID CRYSTAL
EP0120732A1 (en) * 1983-02-24 1984-10-03 Commissariat A L'energie Atomique Sequential control method for a liquid crystal matrix display exhibiting the mematic-cholesteric phase change effect
US4625204A (en) * 1983-02-24 1986-11-25 Commissariat A L'energie Atomique Sequential control process for a matrix display
GB2172780A (en) * 1985-03-18 1986-09-24 Shinetsu Polymer Co Transparent electrode element

Also Published As

Publication number Publication date
GB2004679B (en) 1982-03-03

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Legal Events

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