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SE0100624D0 - Method of driving liquid crystals - Google Patents

Method of driving liquid crystals

Info

Publication number
SE0100624D0
SE0100624D0 SE0100624A SE0100624A SE0100624D0 SE 0100624 D0 SE0100624 D0 SE 0100624D0 SE 0100624 A SE0100624 A SE 0100624A SE 0100624 A SE0100624 A SE 0100624A SE 0100624 D0 SE0100624 D0 SE 0100624D0
Authority
SE
Sweden
Prior art keywords
display areas
display
liquid crystal
active
liquid crystals
Prior art date
Application number
SE0100624A
Other languages
Swedish (sv)
Other versions
SE0100624L (en
SE519582C2 (en
Inventor
Stephen Palmer
Original Assignee
Lc Tec Sweden Ab
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 Lc Tec Sweden Ab filed Critical Lc Tec Sweden Ab
Priority to SE0100624A priority Critical patent/SE519582C2/en
Publication of SE0100624D0 publication Critical patent/SE0100624D0/en
Priority to PCT/SE2002/000257 priority patent/WO2002067045A1/en
Publication of SE0100624L publication Critical patent/SE0100624L/en
Publication of SE519582C2 publication Critical patent/SE519582C2/en

Links

Classifications

    • 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
    • G02F1/13718—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 a change of the texture state of a cholesteric liquid crystal
    • 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
    • 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
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0245—Clearing or presetting the whole screen independently of waveforms, e.g. on power-on
    • 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
    • G09G2310/061—Details of flat display driving waveforms for resetting or blanking

Landscapes

  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Liquid Crystal (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Optics & Photonics (AREA)

Abstract

A method of changing the liquid crystal phase of bistable, cholesteric liquid crystals in a display is provided. In the display there is provided at least two active display areas with inactive display areas lying between said active display areas, and a D.C voltage is applied for a predetermined period of time to neighbouring active display areas, thereby causing the liquid crystal phase of the inactive display areas between the active areas to changed to a predetermined state. In such way, mechanical pressure marks in cholesteric liquid crystal displays can be removed. A display adapted for this method is also disclosed.
SE0100624A 2001-02-23 2001-02-23 Dispalay of bistable cholesteric liquid crystals and method of changing the liquid crystal phase of such SE519582C2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SE0100624A SE519582C2 (en) 2001-02-23 2001-02-23 Dispalay of bistable cholesteric liquid crystals and method of changing the liquid crystal phase of such
PCT/SE2002/000257 WO2002067045A1 (en) 2001-02-23 2002-02-14 A method of changing the phase of bistable cholesteric liquid crystals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE0100624A SE519582C2 (en) 2001-02-23 2001-02-23 Dispalay of bistable cholesteric liquid crystals and method of changing the liquid crystal phase of such

Publications (3)

Publication Number Publication Date
SE0100624D0 true SE0100624D0 (en) 2001-02-23
SE0100624L SE0100624L (en) 2002-08-24
SE519582C2 SE519582C2 (en) 2003-03-18

Family

ID=20283112

Family Applications (1)

Application Number Title Priority Date Filing Date
SE0100624A SE519582C2 (en) 2001-02-23 2001-02-23 Dispalay of bistable cholesteric liquid crystals and method of changing the liquid crystal phase of such

Country Status (2)

Country Link
SE (1) SE519582C2 (en)
WO (1) WO2002067045A1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2644449C3 (en) * 1976-10-01 1979-03-22 Siemens Ag, 1000 Berlin Und 8000 Muenchen Control method for a display screen with a medium located between the rows and columns of a conductor matrix, in particular a liquid crystal layer
EP0106386A3 (en) * 1982-09-23 1985-03-13 BBC Brown Boveri AG Method of triggering a multiplexable bistable liquid crystal display
GB2220096B (en) * 1988-06-21 1992-06-10 Stc Plc Co-ordinate addressing liquid crystal cells
US6014191A (en) * 1996-07-16 2000-01-11 Samsung Electronics Co., Ltd. Liquid crystal display having repair lines that cross data lines twice and cross gate lines in the active area and related repairing methods

Also Published As

Publication number Publication date
WO2002067045A1 (en) 2002-08-29
SE0100624L (en) 2002-08-24
SE519582C2 (en) 2003-03-18

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Legal Events

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