WO2011031509A2 - Fast transitions of large area cholesteric displays - Google Patents

Fast transitions of large area cholesteric displays Download PDF

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Publication number
WO2011031509A2
WO2011031509A2 PCT/US2010/046731 US2010046731W WO2011031509A2 WO 2011031509 A2 WO2011031509 A2 WO 2011031509A2 US 2010046731 W US2010046731 W US 2010046731W WO 2011031509 A2 WO2011031509 A2 WO 2011031509A2
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WO
WIPO (PCT)
Prior art keywords
voltage signal
row
voltage
rows
state
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.)
Ceased
Application number
PCT/US2010/046731
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English (en)
French (fr)
Other versions
WO2011031509A3 (en
Inventor
Patrick M. Campbell
Erich C. Walter
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.)
3M Innovative Properties Co
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3M Innovative Properties Co
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 3M Innovative Properties Co filed Critical 3M Innovative Properties Co
Priority to EP10815864.3A priority Critical patent/EP2471058A4/en
Priority to JP2012526959A priority patent/JP5620493B2/ja
Priority to CN2010800379380A priority patent/CN102483901A/zh
Publication of WO2011031509A2 publication Critical patent/WO2011031509A2/en
Publication of WO2011031509A3 publication Critical patent/WO2011031509A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • 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
    • G09G2310/06—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
    • 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
    • G09G2310/062—Waveforms for resetting a plurality of scan lines at a time
    • 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
    • G09G2310/063—Waveforms for resetting the whole screen at once
    • 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

Definitions

  • Cholesteric liquid crystal displays have existed for several decades.
  • FIG. 5 shows an exemplary voltage pulse for driving pixels of a ChLCD to a homeotropic state.
  • FIG. 7B shows an exemplary second row voltage signal over two periods.
  • FIG. 8A shows an exemplary column voltage signal over two periods resulting in a planar state for use in amplitude modulation.
  • FIG. 9A shows an exemplary column voltage signal over two periods resulting in a planar state for use in pulse width modulation.
  • FIG. 9B shows an exemplary column voltage signal over two periods resulting in a focal conic state for use in pulse width modulation.
  • Exact values of voltage levels VI, V2, V3, V4, V5, V6 and V7 shown in FIG. 4 may vary with each individual active layer in a display. Key voltage levels to be determined for each state are V3, which will drive a pixel to a focal conic state, and V5, which will drive a pixel to a planar state. Voltage levels V3 and V5 can vary depending on the color of the active layer. Exemplary voltages used for active layers 17, 18, 19 shown in FIG. 1 are shown in Table 2 below.
  • Voltage maximum 51 of the reset voltage pulse shown in Fig. 5 can be at least as great as V7 as shown in Fig. 4, when the minimum voltage 52 is zero volts.
  • the maximum 51 and minimum 52 can be adjusted depending upon the DC voltage level of the display.
  • the voltage difference between maximum 51 and minimum 52 can vary depending on which active layer the voltage is being applied to (as shown in Table 2 above) along with other factors, including physical characteristics of a ChLCD.
  • the voltage pulse frequency can be between, for example, 100 and 1,000 hertz. More preferably, it can have a frequency of about 400 hertz. While a single voltage pulse is illustrated in FIG. 5, more than one pulse could be used to drive pixels to a homeotropic state.
  • Darkening the display can include two steps prior to the reset voltage pulse described above.
  • the display can be driven to a homeotropic state by outputting a darken voltage pulse to all the rows or columns of the display simultaneously.
  • the darken voltage pulse can have a similar amplitude to and a lower frequency than the reset voltage pulse shown in FIG. 5 above, or can have any other appropriate characteristics to achieve the desired homeotropic state.
  • a pulse with a longer duration than the reset pulse can sometimes be necessary to drive the pixels in a display to a homeotropic state when the pulse is applied to all the pixels simultaneously.
  • the maximum voltage level 73 is approximately equal to the sum of V4 and V3 divided by two ((V4+V3)/2).
  • the minimum voltage level 74 is approximately equal to the difference between V4 and V3 divided by two ((V4-V3)/2).
  • ChLCD displays that have the following characteristic: VI is greater than or equal to the difference between V4 and V3 divided by two ((V4-V3)/2).
  • the column voltage signal illustrated in FIG. 9C can drive a pixel to a desired level of gray scale, n, within a range of 0 to N-l levels, where N is the total number of desired levels of gray scale.
  • the signal shown in FIG. 9C extends over two periods, and each period is broken into four time segments, two of each of tl 99a and t2 99b.
  • the exemplary signal in FIG. 7C cycles through four voltage levels during each period.
  • the first voltage level 95 can have a time period of tnl and is approximately equal to or greater than V4.
  • Voltage level 95 is sufficiently high to change a pixel to a planar reflective state.
  • the second voltage level 96 can have a time period of t2 and is approximately equal to V3.
  • Voltage level 96 can change a pixel state to a weakly scattering focal conic state.
  • the third voltage level 97 can be OV and is sufficiently low that it cannot substantially change a pixel state.
  • the fourth voltage level 98 is the difference between the first voltage level 95 and the second voltage level 96.
  • drive period is a length of time inversely proportional to a frequency of oscillation of the row voltages.
  • order of voltage levels can be rearranged to tune a display.
  • Any desired number of shades of gray scale can be achieved by choosing a corresponding value for N. Shades of gray scale, n, ranging from 0 to N-l are equally spaced.
  • a signal can be repeated over any desired number of periods to write a pixel.
  • a signal can be transmitted over 1 to 10 periods, or in one embodiment over 2 to 4 periods, or over any other desired number of periods.

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)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)
PCT/US2010/046731 2009-08-27 2010-08-26 Fast transitions of large area cholesteric displays Ceased WO2011031509A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP10815864.3A EP2471058A4 (en) 2009-08-27 2010-08-26 FASTER TRANSITIONS FOR LARGE-SIZED CHOLESTERIC ADS
JP2012526959A JP5620493B2 (ja) 2009-08-27 2010-08-26 大面積コレステリックディスプレイの迅速な移行
CN2010800379380A CN102483901A (zh) 2009-08-27 2010-08-26 大面积胆甾型显示器的快速转变

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12/548,999 2009-08-27
US12/548,999 US8217930B2 (en) 2009-08-27 2009-08-27 Fast transitions of large area cholesteric displays

Publications (2)

Publication Number Publication Date
WO2011031509A2 true WO2011031509A2 (en) 2011-03-17
WO2011031509A3 WO2011031509A3 (en) 2011-06-30

Family

ID=43624170

Family Applications (1)

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PCT/US2010/046731 Ceased WO2011031509A2 (en) 2009-08-27 2010-08-26 Fast transitions of large area cholesteric displays

Country Status (7)

Country Link
US (1) US8217930B2 (enExample)
EP (1) EP2471058A4 (enExample)
JP (1) JP5620493B2 (enExample)
KR (1) KR20120051079A (enExample)
CN (1) CN102483901A (enExample)
TW (1) TW201117168A (enExample)
WO (1) WO2011031509A2 (enExample)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8599353B2 (en) 2010-05-28 2013-12-03 3M Innovative Properties Company Display comprising a plurality of substrates and a plurality of display materials disposed between the plurality of substrates that are connected to a plurality of non-overlapping integral conductive tabs
CN104049395A (zh) * 2014-06-28 2014-09-17 中能柔性光电（滁州）有限公司 一种柔性反射式胆甾相液晶显示器的写入或擦除方法
US10558065B2 (en) * 2018-04-13 2020-02-11 Kent Displays Inc. Liquid crystal writing device with slow discharge erase
CN120279857B (zh) * 2024-01-05 2026-07-07 虹彩光电股份有限公司 胆固醇液晶显示器及其驱动方法
TWI909883B (zh) * 2024-12-18 2025-12-21 友達光電股份有限公司 顯示裝置及其驅動方法

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US6803899B1 (en) 1999-07-27 2004-10-12 Minolta Co., Ltd. Liquid crystal display apparatus and a temperature compensation method therefor

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See also references of EP2471058A4

Also Published As

Publication number Publication date
KR20120051079A (ko) 2012-05-21
EP2471058A2 (en) 2012-07-04
CN102483901A (zh) 2012-05-30
JP2013503367A (ja) 2013-01-31
US20110050678A1 (en) 2011-03-03
TW201117168A (en) 2011-05-16
US8217930B2 (en) 2012-07-10
WO2011031509A3 (en) 2011-06-30
EP2471058A4 (en) 2013-11-20
JP5620493B2 (ja) 2014-11-05

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