GB2301450A - Temperature compensation of ferroelectric liquid crystal displays - Google Patents

Temperature compensation of ferroelectric liquid crystal displays

Info

Publication number
GB2301450A
GB2301450A GB9618092A GB9618092A GB2301450A GB 2301450 A GB2301450 A GB 2301450A GB 9618092 A GB9618092 A GB 9618092A GB 9618092 A GB9618092 A GB 9618092A GB 2301450 A GB2301450 A GB 2301450A
Authority
GB
United Kingdom
Prior art keywords
strobe
liquid crystal
waveform
addressing
row
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
GB9618092A
Other versions
GB9618092D0 (en
GB2301450B (en
Inventor
Jonathan Rennie Hughes
David Charles Scattergood
Michael John Towler
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
Priority claimed from GB9404356A external-priority patent/GB9404356D0/en
Application filed by UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Priority to GB9618092A priority Critical patent/GB2301450B/en
Publication of GB9618092D0 publication Critical patent/GB9618092D0/en
Publication of GB2301450A publication Critical patent/GB2301450A/en
Application granted granted Critical
Publication of GB2301450B publication Critical patent/GB2301450B/en
Anticipated expiration legal-status Critical
Revoked 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
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0202—Addressing of scan or signal lines
    • G09G2310/0205—Simultaneous scanning of several lines in flat panels
    • 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0204—Compensation of DC component across the pixels in flat panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/041—Temperature compensation

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 (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

The invention provides an addressing scheme with temperature compensation for temperature induced changes in liquid crystal material switching parameters. Temperature compensation is provided by measuring liquid crystal temperature, and varying the length of strobe waveforms accordingly. A ferroelectric liquid crystal cell is addressed by row and column electrodes forming an x,y matrix of display elements. A strobe waveform is applied to each row in sequence whilst appropriate data waveforms are applied to all the column electrodes. At each display element the material receives an addressing waveform to switch it to one of its two switched states depending upon the polarity of the addressing waveform. The data waveforms are e.g. alternating positive and negative pulses of period 2ts. The strobe waveform has a zero for one time period ts followed by a unipolar voltage pulse of significant duration e.g. equal to or greater than 0.25 ts or more. This may result in an overlapping of addressing in adjacent rows, e.g. the end of a strobe pulse on one row overlaps with the beginning of a strobe pulse on the next row. The display elements may be switched into one of their two states by one of two strobe pulses of opposite polarity. Alternatively a blanking pulse may switch all elements to one state and a strobe used to switch selected elements to the other state.
GB9618092A 1994-03-07 1995-02-28 Temperature compensation of ferro-electric liquid crystal displays Revoked GB2301450B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9618092A GB2301450B (en) 1994-03-07 1995-02-28 Temperature compensation of ferro-electric liquid crystal displays

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9404356A GB9404356D0 (en) 1994-03-07 1994-03-07 Temperature compensation of ferroelectric liquid crystal displays
GB9618092A GB2301450B (en) 1994-03-07 1995-02-28 Temperature compensation of ferro-electric liquid crystal displays
PCT/GB1995/000417 WO1995024715A1 (en) 1994-03-07 1995-02-28 Temperature compensation of ferroelectric liquid crystal displays

Publications (3)

Publication Number Publication Date
GB9618092D0 GB9618092D0 (en) 1996-10-09
GB2301450A true GB2301450A (en) 1996-12-04
GB2301450B GB2301450B (en) 1998-01-14

Family

ID=26304445

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9618092A Revoked GB2301450B (en) 1994-03-07 1995-02-28 Temperature compensation of ferro-electric liquid crystal displays

Country Status (1)

Country Link
GB (1) GB2301450B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2315874A (en) * 1996-07-29 1998-02-11 Mitsubishi Electric Corp Projection type liquid crystal display
GB2377642A (en) * 2001-05-02 2003-01-22 Asahi Optical Co Ltd Prosthetic filler for a living body and method of manufacturing the prosthetic filler

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0197743A2 (en) * 1985-04-03 1986-10-15 Stc Plc Addressing liquid crystal cells
JPS62215241A (en) * 1986-03-17 1987-09-21 Seiko Instr & Electronics Ltd Ferroelectric liquid crystal electrooptic device
EP0285402A2 (en) * 1987-03-31 1988-10-05 Canon Kabushiki Kaisha Display device
EP0303343A1 (en) * 1987-07-18 1989-02-15 Nortel Networks Corporation Addressing liquid crystal cells
US4923285A (en) * 1985-04-22 1990-05-08 Canon Kabushiki Kaisha Drive apparatus having a temperature detector
WO1992002925A1 (en) * 1990-08-07 1992-02-20 The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland Multiplex addressing of ferro-electric liquid crystal displays

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0197743A2 (en) * 1985-04-03 1986-10-15 Stc Plc Addressing liquid crystal cells
US4923285A (en) * 1985-04-22 1990-05-08 Canon Kabushiki Kaisha Drive apparatus having a temperature detector
JPS62215241A (en) * 1986-03-17 1987-09-21 Seiko Instr & Electronics Ltd Ferroelectric liquid crystal electrooptic device
EP0285402A2 (en) * 1987-03-31 1988-10-05 Canon Kabushiki Kaisha Display device
EP0303343A1 (en) * 1987-07-18 1989-02-15 Nortel Networks Corporation Addressing liquid crystal cells
WO1992002925A1 (en) * 1990-08-07 1992-02-20 The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland Multiplex addressing of ferro-electric liquid crystal displays

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan vol. 12 no. 76(P-675) & JP 62 215 241 A *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2315874A (en) * 1996-07-29 1998-02-11 Mitsubishi Electric Corp Projection type liquid crystal display
GB2315874B (en) * 1996-07-29 1999-04-07 Mitsubishi Electric Corp Projection-type liquid crystal display device
US6072458A (en) * 1996-07-29 2000-06-06 Mitsubishi Denki Kabushiki Kaisha Projection-type liquid crystal display device
GB2377642A (en) * 2001-05-02 2003-01-22 Asahi Optical Co Ltd Prosthetic filler for a living body and method of manufacturing the prosthetic filler
GB2377642B (en) * 2001-05-02 2004-06-02 Asahi Optical Co Ltd Prosthetic filler for a living body and method of manufacturing the prosthetic filler

Also Published As

Publication number Publication date
GB9618092D0 (en) 1996-10-09
GB2301450B (en) 1998-01-14

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Legal Events

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

Effective date: 20010228

773K Patent revoked under sect. 73(2)/1977