SE9903729L - Method for driving liquid crystals - Google Patents

Method for driving liquid crystals

Info

Publication number
SE9903729L
SE9903729L SE9903729A SE9903729A SE9903729L SE 9903729 L SE9903729 L SE 9903729L SE 9903729 A SE9903729 A SE 9903729A SE 9903729 A SE9903729 A SE 9903729A SE 9903729 L SE9903729 L SE 9903729L
Authority
SE
Sweden
Prior art keywords
liquid crystals
picture
driving
driving liquid
picture elements
Prior art date
Application number
SE9903729A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE515073C2 (en
SE9903729D0 (en
Inventor
Bjoern Quickers
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 SE9903729A priority Critical patent/SE515073C2/en
Publication of SE9903729D0 publication Critical patent/SE9903729D0/en
Priority to AU10689/01A priority patent/AU1068901A/en
Priority to PCT/SE2000/001987 priority patent/WO2001027912A1/en
Publication of SE9903729L publication Critical patent/SE9903729L/en
Publication of SE515073C2 publication Critical patent/SE515073C2/en

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
    • G09G3/3614—Control of polarity reversal in general
    • 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
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving

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)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal (AREA)

Abstract

A method for changing a reflectance state of a row and column array of bistable liquid crystals making up picture elements of a liquid crystal display is provided. The method is based on the insight, that less power is consumed when driving bistable cholesteric liquid crystals if the picture of the display is analysed and the driving adapted to the nature of the picture. Thus, the number of desired state changes between picture elements of adjacent rows and in the same column is counted and the polarity of the control voltage is adapted thereto.
SE9903729A 1999-10-15 1999-10-15 Method for driving liquid crystals SE515073C2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE9903729A SE515073C2 (en) 1999-10-15 1999-10-15 Method for driving liquid crystals
AU10689/01A AU1068901A (en) 1999-10-15 2000-10-13 Method of driving liquid crystals
PCT/SE2000/001987 WO2001027912A1 (en) 1999-10-15 2000-10-13 Method of driving liquid crystals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9903729A SE515073C2 (en) 1999-10-15 1999-10-15 Method for driving liquid crystals

Publications (3)

Publication Number Publication Date
SE9903729D0 SE9903729D0 (en) 1999-10-15
SE9903729L true SE9903729L (en) 2001-04-16
SE515073C2 SE515073C2 (en) 2001-06-05

Family

ID=20417375

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9903729A SE515073C2 (en) 1999-10-15 1999-10-15 Method for driving liquid crystals

Country Status (3)

Country Link
AU (1) AU1068901A (en)
SE (1) SE515073C2 (en)
WO (1) WO2001027912A1 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4455576A (en) * 1981-04-07 1984-06-19 Seiko Instruments & Electronics Ltd. Picture display device
JP2822911B2 (en) * 1995-03-23 1998-11-11 日本電気株式会社 Drive circuit

Also Published As

Publication number Publication date
AU1068901A (en) 2001-04-23
SE515073C2 (en) 2001-06-05
SE9903729D0 (en) 1999-10-15
WO2001027912A1 (en) 2001-04-19

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Legal Events

Date Code Title Description
NUG Patent has lapsed