EP0838802A3 - Method of and apparatus for addressing a ferroelectric liquid crystal device and a ferroelectric liquid crystal device - Google Patents

Method of and apparatus for addressing a ferroelectric liquid crystal device and a ferroelectric liquid crystal device Download PDF

Info

Publication number
EP0838802A3
EP0838802A3 EP97307638A EP97307638A EP0838802A3 EP 0838802 A3 EP0838802 A3 EP 0838802A3 EP 97307638 A EP97307638 A EP 97307638A EP 97307638 A EP97307638 A EP 97307638A EP 0838802 A3 EP0838802 A3 EP 0838802A3
Authority
EP
European Patent Office
Prior art keywords
liquid crystal
crystal device
ferroelectric liquid
grey level
pixel
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.)
Withdrawn
Application number
EP97307638A
Other languages
German (de)
French (fr)
Other versions
EP0838802A2 (en
Inventor
Michael John Towler
Akira Tagawa
Paul Bonnet
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.)
Sharp Corp
Original Assignee
Sharp Corp
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 Sharp Corp filed Critical Sharp Corp
Publication of EP0838802A2 publication Critical patent/EP0838802A2/en
Publication of EP0838802A3 publication Critical patent/EP0838802A3/en
Withdrawn legal-status Critical Current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
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • 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
    • 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
    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2044—Display of intermediate tones using dithering
    • G09G3/2051—Display of intermediate tones using dithering with use of a spatial dither pattern
    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/207—Display of intermediate tones by domain size control
    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2074—Display of intermediate tones using sub-pixels

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Computer Hardware Design (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal (AREA)

Abstract

A ferroelectric liquid crystal device, such as a display panel, has a plurality of pixels arranged as rows and columns in a passive matrix arrangement. Each pixel has a plurality of switching thresholds, for instance by having different regions (7, 8) of different thicknesses, so as to provide a plurality of grey levels. A voltage waveform is applied to each pixel for switching it to a desired grey level. A blanking pulse of a first polarity is applied to reset the pixel to a reset grey level. This is followed by a compensating pulse (20) of polarity opposite the first polarity, after which a waveform for selecting the desired grey level is provided. The effect of the compensating pulse (20) is to reduce the effect of τmin shift so as to provide a relatively wide driving window (13) to allow more reliable selection of an intermediate grey level.
EP97307638A 1996-09-30 1997-09-29 Method of and apparatus for addressing a ferroelectric liquid crystal device and a ferroelectric liquid crystal device Withdrawn EP0838802A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9620395 1996-09-30
GB9620395A GB2317735A (en) 1996-09-30 1996-09-30 Addressing a ferroelectric liquid crystal display

Publications (2)

Publication Number Publication Date
EP0838802A2 EP0838802A2 (en) 1998-04-29
EP0838802A3 true EP0838802A3 (en) 1998-07-29

Family

ID=10800733

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97307638A Withdrawn EP0838802A3 (en) 1996-09-30 1997-09-29 Method of and apparatus for addressing a ferroelectric liquid crystal device and a ferroelectric liquid crystal device

Country Status (4)

Country Link
EP (1) EP0838802A3 (en)
JP (1) JPH10153762A (en)
KR (1) KR100236433B1 (en)
GB (1) GB2317735A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100685921B1 (en) * 2001-10-13 2007-02-23 엘지.필립스 엘시디 주식회사 Method For Driving Ferroelectric Liquid Crystal Display Device
WO2011117192A1 (en) 2010-03-22 2011-09-29 Carlsberg Breweries A/S A method and apparatus of cleaning and flushing a beverage dispensing system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4712877A (en) * 1985-01-18 1987-12-15 Canon Kabushiki Kaisha Ferroelectric display panel of varying thickness and driving method therefor
GB2271011A (en) * 1992-09-23 1994-03-30 Central Research Lab Ltd Greyscale addressing of ferroelectric liquid crystal displays.
EP0621580A1 (en) * 1993-04-20 1994-10-26 Canon Kabushiki Kaisha Driving method for liquid crystal device
US5469281A (en) * 1992-08-24 1995-11-21 Canon Kabushiki Kaisha Driving method for liquid crystal device which is not affected by a threshold characteristic change
EP0710945A2 (en) * 1994-11-01 1996-05-08 Sharp Kabushiki Kaisha Method and device for addressing ferroelectric liquid crystal display

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9407116D0 (en) * 1994-04-11 1994-06-01 Secr Defence Ferroelectric liquid crystal display with greyscale

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4712877A (en) * 1985-01-18 1987-12-15 Canon Kabushiki Kaisha Ferroelectric display panel of varying thickness and driving method therefor
US5469281A (en) * 1992-08-24 1995-11-21 Canon Kabushiki Kaisha Driving method for liquid crystal device which is not affected by a threshold characteristic change
GB2271011A (en) * 1992-09-23 1994-03-30 Central Research Lab Ltd Greyscale addressing of ferroelectric liquid crystal displays.
EP0621580A1 (en) * 1993-04-20 1994-10-26 Canon Kabushiki Kaisha Driving method for liquid crystal device
EP0710945A2 (en) * 1994-11-01 1996-05-08 Sharp Kabushiki Kaisha Method and device for addressing ferroelectric liquid crystal display

Also Published As

Publication number Publication date
JPH10153762A (en) 1998-06-09
GB9620395D0 (en) 1996-11-13
KR100236433B1 (en) 2000-07-01
EP0838802A2 (en) 1998-04-29
KR19980025163A (en) 1998-07-06
GB2317735A (en) 1998-04-01

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