WO2011031509A2 - Fast transitions of large area cholesteric displays - Google Patents
Fast transitions of large area cholesteric displays Download PDFInfo
- 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
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- voltage signal
- row
- voltage
- rows
- state
- Prior art date
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
- 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)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012526959A JP5620493B2 (en) | 2009-08-27 | 2010-08-26 | Rapid migration of large area cholesteric displays |
CN2010800379380A CN102483901A (en) | 2009-08-27 | 2010-08-26 | Fast transitions of large area cholesteric displays |
EP10815864.3A EP2471058A4 (en) | 2009-08-27 | 2010-08-26 | Fast transitions of large area cholesteric displays |
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)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2010/046731 WO2011031509A2 (en) | 2009-08-27 | 2010-08-26 | Fast transitions of large area cholesteric displays |
Country Status (7)
Country | Link |
---|---|
US (1) | US8217930B2 (en) |
EP (1) | EP2471058A4 (en) |
JP (1) | JP5620493B2 (en) |
KR (1) | KR20120051079A (en) |
CN (1) | CN102483901A (en) |
TW (1) | TW201117168A (en) |
WO (1) | WO2011031509A2 (en) |
Families Citing this family (3)
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 (en) * | 2014-06-28 | 2014-09-17 | 中能柔性光电(滁州)有限公司 | Writing or erasing method for flexible reflection type cholesteric liquid crystal displayer |
US10558065B2 (en) * | 2018-04-13 | 2020-02-11 | Kent Displays Inc. | Liquid crystal writing device with slow discharge erase |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0613116A2 (en) | 1993-02-25 | 1994-08-31 | Seiko Epson Corporation | Method of driving a liquid crystal display device |
US6803899B1 (en) | 1999-07-27 | 2004-10-12 | Minolta Co., Ltd. | Liquid crystal display apparatus and a temperature compensation method therefor |
Family Cites Families (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH617281A5 (en) | 1977-07-29 | 1980-05-14 | Bbc Brown Boveri & Cie | |
US4386350A (en) | 1979-06-26 | 1983-05-31 | Nippon Electric Co., Ltd. | Display apparatus |
US4890902A (en) | 1985-09-17 | 1990-01-02 | Kent State University | Liquid crystal light modulating materials with selectable viewing angles |
US5453863A (en) | 1991-05-02 | 1995-09-26 | Kent State University | Multistable chiral nematic displays |
ATE178645T1 (en) | 1991-05-02 | 1999-04-15 | Univ Kent State Ohio | LIQUID CRYSTAL LIGHT MODULATING DEVICE AND MATERIAL |
US5644330A (en) | 1994-08-11 | 1997-07-01 | Kent Displays, Inc. | Driving method for polymer stabilized and polymer free liquid crystal displays |
US5748277A (en) | 1995-02-17 | 1998-05-05 | Kent State University | Dynamic drive method and apparatus for a bistable liquid crystal display |
US6154190A (en) | 1995-02-17 | 2000-11-28 | Kent State University | Dynamic drive methods and apparatus for a bistable liquid crystal display |
US5933203A (en) | 1997-01-08 | 1999-08-03 | Advanced Display Systems, Inc. | Apparatus for and method of driving a cholesteric liquid crystal flat panel display |
US6034752A (en) | 1997-03-22 | 2000-03-07 | Kent Displays Incorporated | Display device reflecting visible and infrared radiation |
US6268840B1 (en) | 1997-05-12 | 2001-07-31 | Kent Displays Incorporated | Unipolar waveform drive method and apparatus for a bistable liquid crystal display |
US6133895A (en) | 1997-06-04 | 2000-10-17 | Kent Displays Incorporated | Cumulative drive scheme and method for a liquid crystal display |
GB9904704D0 (en) | 1999-03-03 | 1999-04-21 | Secr Defence | Addressing bistable nematic liquid crystal devices |
JP4244455B2 (en) * | 1999-07-27 | 2009-03-25 | コニカミノルタホールディングス株式会社 | Liquid crystal display device and driving method thereof |
AU2001231255A1 (en) | 2000-01-31 | 2001-08-07 | Three-Five Systems, Inc. | Methods and apparatus for driving a display |
JP4706123B2 (en) | 2000-05-29 | 2011-06-22 | コニカミノルタホールディングス株式会社 | Liquid crystal display device and method for driving liquid crystal display element |
GB0024488D0 (en) * | 2000-10-05 | 2000-11-22 | Koninkl Philips Electronics Nv | Bistable chiral nematic liquid crystal display and method of driving the same |
US6710760B1 (en) | 2000-11-28 | 2004-03-23 | Eastman Kodak Company | Unipolar drive for cholesteric liquid crystal displays |
KR100563043B1 (en) | 2001-12-21 | 2006-03-24 | 삼성에스디아이 주식회사 | Method for driving cholestric liquid crystal display panel by delayed homeotropic reset |
US7307608B2 (en) | 2002-03-08 | 2007-12-11 | Industrial Technology Research Institute | Unipolar drive chip for cholesteric liquid crystal displays |
US6894668B2 (en) | 2002-05-03 | 2005-05-17 | Eastman Kodak Company | General 2 voltage levels driving scheme for cholesterical liquid crystal displays |
US20060152457A1 (en) * | 2002-09-27 | 2006-07-13 | Masaki Kitaoka | Cholesteric liquid crystal display device and method for driving cholesteric liquid crystal display device |
JP3818273B2 (en) | 2003-05-23 | 2006-09-06 | コニカミノルタホールディングス株式会社 | Method for driving liquid crystal display element and liquid crystal display device |
JP4313702B2 (en) * | 2004-03-11 | 2009-08-12 | ナノックス株式会社 | Liquid crystal display element and driving method thereof |
IL165150A0 (en) * | 2004-11-10 | 2005-12-18 | Magink Display Technologies | A cholesteric liquid crystal display device |
DE602005012140D1 (en) | 2004-11-10 | 2009-02-12 | Magink Display Technologies | CONTROL CHART FOR A CHOLESTERIC LIQUID CRYSTAL DISPLAY ELEMENT |
US20070082268A1 (en) | 2005-09-02 | 2007-04-12 | Kurt Star | Chemical protection of metal surface |
JP5071388B2 (en) * | 2006-08-23 | 2012-11-14 | 富士通株式会社 | Liquid crystal display element, driving method thereof, and electronic paper including the same |
US7648645B2 (en) | 2006-11-08 | 2010-01-19 | 3M Innovative Properties Company | Pre-polymer formulations for liquid crystal displays |
-
2009
- 2009-08-27 US US12/548,999 patent/US8217930B2/en not_active Expired - Fee Related
-
2010
- 2010-08-26 WO PCT/US2010/046731 patent/WO2011031509A2/en active Application Filing
- 2010-08-26 JP JP2012526959A patent/JP5620493B2/en not_active Expired - Fee Related
- 2010-08-26 CN CN2010800379380A patent/CN102483901A/en active Pending
- 2010-08-26 TW TW099128693A patent/TW201117168A/en unknown
- 2010-08-26 KR KR1020127007699A patent/KR20120051079A/en not_active Application Discontinuation
- 2010-08-26 EP EP10815864.3A patent/EP2471058A4/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0613116A2 (en) | 1993-02-25 | 1994-08-31 | Seiko Epson Corporation | Method of driving a liquid crystal display device |
US6803899B1 (en) | 1999-07-27 | 2004-10-12 | Minolta Co., Ltd. | Liquid crystal display apparatus and a temperature compensation method therefor |
Non-Patent Citations (1)
Title |
---|
See also references of EP2471058A4 |
Also Published As
Publication number | Publication date |
---|---|
JP5620493B2 (en) | 2014-11-05 |
TW201117168A (en) | 2011-05-16 |
US20110050678A1 (en) | 2011-03-03 |
US8217930B2 (en) | 2012-07-10 |
CN102483901A (en) | 2012-05-30 |
KR20120051079A (en) | 2012-05-21 |
JP2013503367A (en) | 2013-01-31 |
EP2471058A4 (en) | 2013-11-20 |
WO2011031509A3 (en) | 2011-06-30 |
EP2471058A2 (en) | 2012-07-04 |
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