EP2178079A1 - Energiesparendes Verfahren zum Markieren eines Bereichs eines Flüssigkristallbildschirms - Google Patents

Energiesparendes Verfahren zum Markieren eines Bereichs eines Flüssigkristallbildschirms Download PDF

Info

Publication number
EP2178079A1
EP2178079A1 EP08290975A EP08290975A EP2178079A1 EP 2178079 A1 EP2178079 A1 EP 2178079A1 EP 08290975 A EP08290975 A EP 08290975A EP 08290975 A EP08290975 A EP 08290975A EP 2178079 A1 EP2178079 A1 EP 2178079A1
Authority
EP
European Patent Office
Prior art keywords
signal
pixel
state
zone
stable
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
EP08290975A
Other languages
English (en)
French (fr)
Other versions
EP2178079B1 (de
Inventor
Ivan Dozov
François Leblanc
Jean-Denis Laffite
Stéphane Joly
Philippe Martinot-Lagarde
Jacques Angele
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.)
France Brevets SAS
Original Assignee
Nemoptic SA
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 Nemoptic SA filed Critical Nemoptic SA
Priority to EP08290975.5A priority Critical patent/EP2178079B1/de
Priority to PCT/FR2009/001190 priority patent/WO2010043780A1/fr
Priority to US13/698,987 priority patent/US20130076610A1/en
Priority to TW098134864A priority patent/TW201033985A/zh
Publication of EP2178079A1 publication Critical patent/EP2178079A1/de
Application granted granted Critical
Publication of EP2178079B1 publication Critical patent/EP2178079B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • G09G3/3611—Control of matrices with row and column drivers
    • 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
    • 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
    • G09G3/2011—Display of intermediate tones by amplitude modulation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/08—Cursor circuits

Definitions

  • the invention relates to a method of addressing a liquid crystal display screen and a display device implementing this method.
  • the present invention relates to liquid crystal bistable displays. It is particularly applicable to nematic liquid crystal bistable displays whose two stable textures differ by a twist of about 180 °.
  • the thickness of the cell thus formed is made constant for example by distributing, between the blades, beads whose diameter is equal to the desired thickness (typically 1 to 6 microns).
  • Monostable liquid crystal devices are known. In the absence of an electric field, the liquid crystal is oriented in a single texture. This texture corresponds to an absolute minimum of the elastic energy of the liquid crystal in the cell, given the anchors on the two blades. Under an electric field, this texture is continuously deformed and its optical properties vary according to the applied voltage.
  • Anchoring layers maintain the direction of the molecules near the blades, which varies little, both in the plane of the substrate (azimuth plane) and in the direction perpendicular to it (direction zenithale): a strong anchoring of the molecules near the blades on the alignment layer corresponds to a strong azimuthal anchoring (maintaining a fixed direction in the plane of the substrate) and a strong zenith anchorage (maintaining a direction close to the plane substrate, that is to say, little or no lifting molecules to the direction perpendicular to the substrate, parallel to the electric field, and whatever the voltage applied).
  • the nematic is recalled by the anchors on the two blades. It returns according to the unique stable texture without applied field.
  • the device is monostable.
  • TN twisted nematic
  • STN supertordus
  • EOB electrically controlled birefringence
  • VAN vertically aligned
  • these displays can be addressed directly (very low resolution), in passive multiplexed mode (medium resolution) or in active mode (high resolution).
  • the addressing signals When the addressing is multiplexed, that is to say carried out line by line, for the image to appear visually stable, the addressing signals must be sent at a frequency of several tens of hertz: as soon as the pixel is no longer energized, it relaxes to the stable state without an applied field.
  • the object of the present invention is to improve the performance of liquid crystal display devices.
  • the object of the invention is to make it possible, by the use of new means, to mark part or all of the information displayed on a liquid crystal display, while maintaining a reduced energy consumption compared to that of a standard liquid crystal display.
  • steps A and B are preferably spaced apart by a duration less than a duration of retinal persistence of the observer, so as to obtain a visual effect of static marking of the zone.
  • the method according to the invention may further comprise a displacement of the pixel area on the screen between at least two iterations of steps A and B.
  • the pixels of the layer are preferably arranged in lines of parallel pixels and parallel columns of pixels, the lines being substantially perpendicular to the columns.
  • the perturbation signal applied to a pixel preferably comprises a column signal applied to the column on which this pixel is situated and furthermore preferably comprises a line signal applied to the line on which this pixel is situated, this perturbation signal being of preference proportional or equal to a difference between the column signal and the line signal.
  • the area may comprise a set of adjacent lines or a set of adjacent columns.
  • the area may include an intersection of a set of adjacent lines and a set of adjacent columns.
  • the two stable states preferably comprise a blocking state and an on state, the on state having a luminance (Lib) perceived by the observer greater than the luminance (Lid) of the blocking state, the disturbed state of a pixel initially in the on state having a luminance (Lpb) perceived by the observer lower by at least 5% with respect to the luminance (Lib) of the initial state passing from this pixel.
  • the on state having a luminance (Lib) perceived by the observer greater than the luminance (Lid) of the blocking state
  • the disturbed state of a pixel initially in the on state having a luminance (Lpb) perceived by the observer lower by at least 5% with respect to the luminance (Lib) of the initial state passing from this pixel.
  • the disturbance signal may comprise an electrical signal having an RMS value of voltage greater than 1.65 times a Freedericksz voltage of the liquid crystal layer.
  • the disturbance signal is preferably bipolar.
  • the pixels are arranged in parallel pixel lines and parallel pixel columns, the lines being substantially perpendicular to the columns.
  • the liquid crystal of the layer is of the nematic type.
  • the liquid crystal layer is placed between two blades, the assembly constituting a liquid crystal cell.
  • Each blade comprises a substrate, preferably made of glass, on which a conductive electrode has been deposited, followed by a so-called anchoring layer, also called a layer. alignment.
  • the anchoring layer exerts on the neighboring liquid crystal molecules a return torque which tends to orient them parallel to a direction called easy axis.
  • the anchoring layers are preferably made by a brushed polymer deposit to create the direction of the easy axis. This direction of the easy axis is preferably very close to the brushing direction.
  • the thickness of the cell thus formed (that is to say the distance between the blades between which is included the liquid crystal layer), called d, is made constant for example by distributing, between the blades, balls of which the diameter is equal to the desired thickness (typically 1 to 6 ⁇ m).
  • the liquid crystal of the layer is "bistable": this type of liquid crystal operates by switching between two stable states in the absence of an electric field. An external electric field is applied only for the time necessary to switch the texture of the liquid crystal from one state to another. In the absence of an electrical control signal, the display remains in the state obtained. By its operating principle, this type of display consumes energy proportional to the number of image changes. Thus, when the frequency of these changes decreases, the power required for the operation of the display tends to zero.
  • the figure 1 illustrates, for the first embodiment of the device according to the invention, two different states of a liquid crystal pixel between two portions of the blades.
  • This first mode uses a flexo-electric effect to switch, that is to say the sign of the applied electric field. This is the pretilt, ie the angle that the liquid crystal molecule close to the surface with it, which varies between two stable values without applied field.
  • This bistability is obtained using a network serving as alignment layer (cf documents [1], [2], [3] and figure 1 ).
  • This technology is called ZBD (Zenithal Bistable Display).
  • One of the alignment layers is constituted by a periodic network allowing the vicinity of the surface of this network two orientations of the liquid crystal molecules, one planar, the other homeotropic.
  • the figure 2 is a sectional and sectional view of a portion of the liquid crystal cell of the second device embodiment according to the invention.
  • This second bistable embodiment uses a surface effect: a break of the zenith anchorage on at least one of the alignment layers. This break allows switching between two textures whose torsions differ by an angle between 150 ° and 180 ° in absolute value.
  • BiNem The operation of this display called BiNem is described in the following paragraph.
  • the BiNem display (documents [4] to [8]) is schematically presented on the figure 2 , and has a general configuration identical to that of the liquid crystal cell type ZBD which also uses substrates, electrodes, polarizers, liquid crystal.
  • the BiNem display preferably uses two twisted textures that differ by a twist of approximately +/- 180 ° (located in absolute value between 150 ° and 180 °).
  • a preferred but nonlimiting variant consists of a uniform or slightly twisted texture called U (illustrated on the left of the figure 2 ) in which the molecules are substantially parallel to each other, and of a strongly twisted texture called T (illustrated on the right of the figure 2 ).
  • the least twisted U texture has a twist between 0 ° and 20 ° in absolute value.
  • the liquid crystal layer 30 is placed between the two blades 20 and 10, which are respectively called master blade and slave blade.
  • the master blade 20 comprises a substrate 21, an electrode 22 and an anchoring layer 24 forming a strong azimuth and zenith anchorage of the liquid crystal, that is to say an anchorage of the same type as that used in crystal displays. monostable liquid.
  • the slave blade 10 comprises a substrate 11, an electrode 12 and an anchoring layer 14 providing a specific anchorage, corresponding to a weak zenith anchor and a medium or strong azimuthal anchoring of the liquid crystal.
  • the usually transparent electrodes 12 and 22 are typically made of a material called ITO deposited on the substrates 11 and 21. They make it possible to apply an electric field perpendicular to the plates 10 and 20.
  • each of the substrates 11 and 21, typically but not exclusively outside the cell makes it possible to associate each texture with an optical state, for example dark for the texture U and clear for the texture T or vice versa, according to the angles of the two polarizers with respect to the directions of the anchors.
  • the cell evolves towards one or the other of the bistable textures U and T (see figure 2 ).
  • the control signals used induce a strong flow of the liquid crystal in the vicinity of the master blade 20, the hydrodynamic coupling 26 between the master blade 20 and the slave blade 10 creates a sufficient hydrodynamic flow (or flow) near the slave blade to induce the texture T.
  • the texture U is obtained by elastic coupling 28 between the two blades 10 and 20, aided by the possible inclination of the weak anchor.
  • switching of a screen element or pixel of a BiNem-type display will be used to make the molecules of the liquid crystal pass from an initial stable texture (U or T or a coexistence thereof). two textures) towards a final stable texture (U or T or a coexistence of these textures). This name is also valid for the two stable textures of the ZBD type display.
  • the signal applied to the pixel is conventionally made up of several levels.
  • the signal applied to the pixel VP is typically two-stage, but can also be multi-stage [13] or single-stage. If the voltage drop between two stages exceeds a certain absolute value, and that it operates in a sufficiently short time, the "jump" of tension is sufficient for the texture T is obtained. If the jump is not sufficient, or if the transition time is too long, the hydrodynamic flow is insufficient, the texture T becomes impossible, and the texture U is obtained.
  • the 3 addressing modes developed for the standard liquid crystal can be used for the BiNem or ZBD display.
  • the most common addressing mode is multiplexed passive addressing, but active addressing using thin-film transistors is also possible [14].
  • the display (of type Binem or ZBD) is a matrix screen formed of N x M screen elements called pixels, N being the number of rows of pixels and M the number of columns of pixels. , and addressing is done line by line.
  • These strips 50, 52 perpendicular are deposited on each blade.
  • the area between two adjacent conductive strips carried by the same substrate is called interpixel space.
  • the area consisting of all the pixels is called matrix area.
  • a marking area Zm is a part of this matrix area.
  • the matrix area corresponds to the display area, on which area the image content that is to be displayed is displayed. Outside the matrix area, the aforementioned conductive strips 50, 52 are transformed into tracks which make the connection to the control circuits generating the addressing signal.
  • These control circuits may be located on the substrate or remote.
  • the displays are addressed using components or control circuits that we will call “drivers” located for example on flexible connection elements welded to the screen.
  • the drivers consisting mainly of analog gates controlled by shift registers, make it possible to make the link between the control electronics and the tracks.
  • the conductive electrodes are made of a transparent conductive material called ITO (mixed oxide of Indium and tin). But when the display is reflective, the electrodes located on the opposite side to the observer can be made with an opaque conductive material, for example aluminum.
  • the passive mode is applied by orthogonal electrode strips constituting the rows and the columns, the intersections of which constitute the pixels, whereas during active addressing, the electrical voltage is applied to the transistors associated with each pixel by fine wires. All the transistors of the same line are passing during the activation of this line.
  • the addressing is carried out line by line.
  • an electrical signal is applied on this line, which is then called “activated”.
  • activation signal line addressing signal VLn In the case of a standard passive multiplexing, the signal VLn is identical for all the lines, and we will call it VL.
  • the first phase essentially consists of obtaining an anchoring break, ie the homeotropic texture on the line considered, by applying for example a voltage V1L> Vcass on the signal of line addressing for a duration T1, which constitutes a first level of VL.
  • V1L is between 6V and 30V over the 0 ° - 50 ° temperature range.
  • a signal V2L is applied on the line for a duration T2, which constitutes a second and last level of VL.
  • V2L is between 2V and 12V over the 0 ° -50 ° temperature range.
  • the line addressing signal is in this two-stage example, but it can also be single-stage or multi-stage.
  • a variant uses a line signal lower than the breaking voltage, the column signal enabling switching in one or the other of the textures [20]; or, according to a two-step variant, all the pixels are first switched in the same texture, then the column voltage causes the break but only in the pixels to switch in the other texture.
  • This time is typically but not limited to between 10 ⁇ s and 10 ms.
  • This addressing "one-step addressing".
  • the order of activation of the lines (first n-1, then n, then n + 1) defines the scanning direction 46 (see figure 3 ).
  • the addressing time of the display is the time required to address all its lines, so as to display new image content.
  • the document [15] describing the achievement of gray levels provides three variants for obtaining gray levels (FIG. 23 of document [15]) by modifying the parameters of VC.
  • the brushing direction of the alignment layers is orthogonal to the direction of the lines of the display, this type of display is called "orthogonal brushing" (document [15]).
  • bipolar pulses for the Vpre signal and for the VL signal can be used.
  • the field to be applied, to orient the molecules most often has a threshold.
  • a threshold For example, consider a positive dielectric anisotropy nematic placed in a planar and parallel anchored cell on both blades; without a field, the molecules are parallel to each other and parallel to the slides throughout the cell.
  • An electric field, applied perpendicularly to the blades, begins to orient the molecules only when the voltage is greater than a certain threshold called the Freedericksz VF threshold or Freedericksz VF voltage (document [16]).
  • Freedericksz VF threshold Freedericksz VF voltage (document [16]).
  • Freedericksz VF threshold Freedericksz VF voltage
  • VFd is slightly higher than VFs.
  • pretilt When the inclination of the molecules on a blade (pretilt) is high, the threshold disappears. For intermediate pretilts, typically a few degrees, the threshold remains but it is less marked. When the cells are bent or doped, but still planar, the threshold remains but the threshold voltage can vary up to about 30% compared to the theoretical VF voltage obtained with a planar and parallel anchored cell.
  • V0 a threshold voltage
  • Disturbance signal Sp applied according to the invention is Disturbance signal Sp applied according to the invention.
  • the invention makes it possible to mark a pixel or an area of a matrix bistable display comprising two stable liquid crystal textures without an applied field, by an original method, which is not applicable on monostable displays.
  • the concept of marking is defined by a visually detectable optical modification of this area relative to the rest of the image.
  • the proposed method is to apply, over a whole marking zone Zm comprising a set of pixels to be marked, during the time t1, an electrical signal called disturbance signal Sp having a defined amplitude not including a zero continuous range, then no longer apply a signal during time t2.
  • This disturbance signal Sp distorts the two textures corresponding to the two states of the pixels: their optical properties are modified, the contrast decreases to the value of the disturbance signal for which the zone takes a uniform hue.
  • the marking of the zone is in this case maximum.
  • the signal applied to a pixel is the difference between the signal on its line and that on its column.
  • the difficulty with respect to the previous case is to optically disturb only the zone situated at the intersection of the excited lines and columns, while the other pixels of the excited lines and columns not belonging to the zone to be marked are not disturbed. This result will be obtained by taking advantage of the existence of the threshold voltage of the display V0.
  • a first option is illustrated on the figure 9 .
  • the zone marked Zm is in black, the strip of excited lines is horizontal and in light gray, and the band of excited columns is vertical and dark gray.
  • V0 RMS 3 times V0 RMS is applied to the excited lines and + V0 RMS to the other lines, 0V RMS to the excited columns, and 2xV0 RMS to the non-excited columns.
  • an RMS voltage V0 to the whole screen except the pixels of the zone to be marked Zm which receive 3 times V0 RMS, which is more than enough to obtain a disturbance of the previously registered image.
  • the pixels subjected to V0, threshold voltage will not react to this voltage and remain stable.
  • a second option is illustrated on the figure 10 .
  • the zone marked Zm is in black, the strip of excited lines is horizontal and in light gray, and the band of excited columns is vertical and dark gray.
  • This second option makes it possible to apply a potential difference only on the excited lines and columns, which is less energy consuming.
  • V0 is applied twice to the excited lines and V0 to the other lines, 0V to the excited columns, and V0 to the non-excited columns.
  • a zero voltage or V0 is applied to the pixels outside the flashing zone Zm, and V0 is applied twice to the pixels of the flashing zone Zm.
  • the disturbance signal here is 2 times V0 compared to 3 times V0 for the previous variant.
  • a third variant of the invention is to mark (statically or flashing) a mobile marking zone Zm, called "cursor".

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)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
EP08290975.5A 2008-10-15 2008-10-15 Energiesparendes Verfahren zum Markieren eines Bereichs eines Flüssigkristallbildschirms Not-in-force EP2178079B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP08290975.5A EP2178079B1 (de) 2008-10-15 2008-10-15 Energiesparendes Verfahren zum Markieren eines Bereichs eines Flüssigkristallbildschirms
PCT/FR2009/001190 WO2010043780A1 (fr) 2008-10-15 2009-10-08 « procédé économique en énergie pour marquer une zone d'un écran à cristal liquide »
US13/698,987 US20130076610A1 (en) 2008-10-15 2009-10-08 Energy-saving method for marking an area of a liquid crystal screen
TW098134864A TW201033985A (en) 2008-10-15 2009-10-15 Energy-saving method for marking an area of a liquid crystal screen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08290975.5A EP2178079B1 (de) 2008-10-15 2008-10-15 Energiesparendes Verfahren zum Markieren eines Bereichs eines Flüssigkristallbildschirms

Publications (2)

Publication Number Publication Date
EP2178079A1 true EP2178079A1 (de) 2010-04-21
EP2178079B1 EP2178079B1 (de) 2014-07-30

Family

ID=40352184

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08290975.5A Not-in-force EP2178079B1 (de) 2008-10-15 2008-10-15 Energiesparendes Verfahren zum Markieren eines Bereichs eines Flüssigkristallbildschirms

Country Status (4)

Country Link
US (1) US20130076610A1 (de)
EP (1) EP2178079B1 (de)
TW (1) TW201033985A (de)
WO (1) WO2010043780A1 (de)

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0744042A1 (de) 1994-02-09 1996-11-27 Secr Defence Orientierungsverfahren für flüssigkristallvorrichtung
US6061042A (en) * 1997-02-06 2000-05-09 Ricoh Company, Ltd. Liquid crystal display device
US6133895A (en) * 1997-06-04 2000-10-17 Kent Displays Incorporated Cumulative drive scheme and method for a liquid crystal display
US6327017B2 (en) 1995-11-08 2001-12-04 Nemoptic S.A. Bistable liquid crystal display device in which nematic liquid crystal has monostable anchorings
US6795146B2 (en) 2000-05-12 2004-09-21 Nemoptic Bistable device for reflection display with inverse contrast
US6831716B2 (en) 2000-05-12 2004-12-14 Nemoptic Reflective bistable display device incorporating a liquid crystal material
WO2005054940A1 (fr) 2003-11-28 2005-06-16 Nemoptic Dispositif d’affichage a ecran de type nematique bistable optimisant le blanc et procede de definition de ce dispositif
WO2005054941A1 (fr) 2003-11-28 2005-06-16 Nemoptic Dispositif d’affichage a ecran de type nematique bistable optimisant le noir et procede de definition de ce dispositif
US7067180B2 (en) 2002-06-06 2006-06-27 Nemoptic Method of producing nematic liquid-crystal devices
US7087270B2 (en) 2000-12-12 2006-08-08 Nemoptic Method for producing a liquid crystal device with low zenithal anchoring energy, and resulting device
WO2006136799A1 (en) * 2005-06-23 2006-12-28 Magink Display Technologies Ltd. Video drive scheme for a cholesteric liquid crystal display device
US7173587B2 (en) 2002-02-06 2007-02-06 Nemoptic Addressing process and device for a bistable liquid crystal screen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070279350A1 (en) * 2006-06-02 2007-12-06 Kent Displays Incorporated Method and apparatus for driving bistable liquid crystal display

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0744042A1 (de) 1994-02-09 1996-11-27 Secr Defence Orientierungsverfahren für flüssigkristallvorrichtung
US6327017B2 (en) 1995-11-08 2001-12-04 Nemoptic S.A. Bistable liquid crystal display device in which nematic liquid crystal has monostable anchorings
US6061042A (en) * 1997-02-06 2000-05-09 Ricoh Company, Ltd. Liquid crystal display device
US6133895A (en) * 1997-06-04 2000-10-17 Kent Displays Incorporated Cumulative drive scheme and method for a liquid crystal display
US6795146B2 (en) 2000-05-12 2004-09-21 Nemoptic Bistable device for reflection display with inverse contrast
US6831716B2 (en) 2000-05-12 2004-12-14 Nemoptic Reflective bistable display device incorporating a liquid crystal material
US7087270B2 (en) 2000-12-12 2006-08-08 Nemoptic Method for producing a liquid crystal device with low zenithal anchoring energy, and resulting device
US7173587B2 (en) 2002-02-06 2007-02-06 Nemoptic Addressing process and device for a bistable liquid crystal screen
US7067180B2 (en) 2002-06-06 2006-06-27 Nemoptic Method of producing nematic liquid-crystal devices
WO2005054940A1 (fr) 2003-11-28 2005-06-16 Nemoptic Dispositif d’affichage a ecran de type nematique bistable optimisant le blanc et procede de definition de ce dispositif
WO2005054941A1 (fr) 2003-11-28 2005-06-16 Nemoptic Dispositif d’affichage a ecran de type nematique bistable optimisant le noir et procede de definition de ce dispositif
WO2006136799A1 (en) * 2005-06-23 2006-12-28 Magink Display Technologies Ltd. Video drive scheme for a cholesteric liquid crystal display device

Non-Patent Citations (8)

* Cited by examiner, † Cited by third party
Title
1. DOZOV; PH. MARTINOT-LAGARDE, PHYS. REV. E., vol. 58, 1998, pages 7442
DE GENNES P. G.; PROST J.: "International Series of Monographs on Physics", vol. 83, 1974, article "The Physics of Liquid Crystals", pages: 123
G.P. BRYAN-BROWN ET AL.: "Grating Aligned Bistable Nematic Device", PROCEEDING SID, 1997, pages 37 - 40, XP000722653
I.DOZOV ET AL.: "Recent improvements of bistable nematic displays switched by anchoring breaking (BiNem", PROCEEDING SID, 2001, pages 224 - 227, XP001054082
J.CLIFF JONES ET AL.: "Novel bistable liquid crystal displays based on grating alignment", PROCEEDING OF SPIE VOL,3955, 2000, pages 84 - 93, XP008003419, DOI: doi:10.1117/12.379969
M.GIOCONDO ET AL., EUR. PHYS. J.AP5, 1999, pages 227
P. MARTINOT LAGARDE ET AL., SPIE, vol. 5003, 2003, pages 25 - 34
THIERRY LEROUX: "Display Metrology", SID, 2002, pages 11 - 1

Also Published As

Publication number Publication date
WO2010043780A1 (fr) 2010-04-22
US20130076610A1 (en) 2013-03-28
TW201033985A (en) 2010-09-16
EP2178079B1 (de) 2014-07-30

Similar Documents

Publication Publication Date Title
EP0149398B1 (de) Speicherndes Anzeigeelement mit einem ferroelektrischen Material
CA2231369C (fr) Dispositif d'affichage a base de cristaux liquides et a effet bistable
CA2409708C (fr) Dispositif bistable d'affichage en reflexion avec contraste inverse
JP4915418B2 (ja) 表示素子、それを備えた電子ペーパー、それを備えた電子端末機器及びそれを備えた表示システム並びに表示素子の画像処理方法
US20110109854A1 (en) Color-Tunable Plasmonic Device with a Partially Modulated Refractive Index
KR20000069992A (ko) 초기에는 네마틱 상태로 설정된 콜레스테릭 액정 평판 디스플레이의 구동장치 및 구동방법
EP0535127B1 (de) Nematische flüssigkristallanzeige mit oberflächeninduzierter bistabilität und steuerung durch den flexoelektrischen effekt
EP0093035B1 (de) Optische Flüssigkristallzellen
CA2418312C (fr) Procede et dispositif d'adressage d'un ecran cristal liquide bistable
EP1281169B1 (de) Bistabile reflektionsanzeigevorrichtung
CA2260262A1 (fr) Dispositif a cristaux liquides comprenant des moyens d'ancrage sur au moins une plaque de confinement donnant une orientation degeneree
EP0773468A1 (de) Bistabile nematische Flüssigkristallanzeige mit Graustufenfähigkeit
US7944425B2 (en) Liquid crystal display element and method of driving the element
EP2178079B1 (de) Energiesparendes Verfahren zum Markieren eines Bereichs eines Flüssigkristallbildschirms
EP2126888B1 (de) Flüssigkristallanzeige mit verbesserten schaltmitteln
EP0517715A1 (de) Optische bistabile vorrichtung mit flüssigkristallen und elektrochiraler steuerung
EP2153434A1 (de) Verfahren zur ansteuerung eines flüssigkristall-matrixbildschirms und geräte zur anwendung dieses verfahrens
US20030151580A1 (en) Motion video cholesteric displays
FR2584521A1 (fr) Dispositif d'affichage electro-optique a cristal liquide
EP0619030A1 (de) Ferroelektrische flussigkristall-anzeigevorrichtung
FR2916296A1 (fr) Procede d'adressage d'un ecran matriciel a cristal liquide et dispositif appliquant ce procede.
WO2002027393A1 (fr) Dispositif d'affichage bistable a base de cristaux liquides
JP4924610B2 (ja) 表示素子、それを備えた電子ペーパー、それを備えた電子端末機器及びそれを備えた表示システム並びに表示素子の画像処理方法
WO1994009476A1 (fr) Procede de formation selective et de croissance differentielle d'une nouvelle phase solide par voie electrochimique
WO2009030603A1 (fr) Dispositif de visualisation comportant un écran a cristaux liquides a affichage sécurise

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20081117

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA MK RS

19U Interruption of proceedings before grant

Effective date: 20101007

19W Proceedings resumed before grant after interruption of proceedings

Effective date: 20130502

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: FRANCE BREVETS

AKY No designation fees paid
REG Reference to a national code

Ref country code: DE

Ref legal event code: R108

REG Reference to a national code

Ref country code: DE

Ref legal event code: R108

Effective date: 20140108

RBV Designated contracting states (corrected)

Designated state(s): AT BE BG CH CY LI

RBV Designated contracting states (corrected)

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20140429

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 680296

Country of ref document: AT

Kind code of ref document: T

Effective date: 20140815

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: FRENCH

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602008033549

Country of ref document: DE

Effective date: 20140911

REG Reference to a national code

Ref country code: NL

Ref legal event code: T3

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 680296

Country of ref document: AT

Kind code of ref document: T

Effective date: 20140730

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141031

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140730

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140730

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141202

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141030

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140730

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140730

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20141008

Year of fee payment: 7

Ref country code: GB

Payment date: 20141015

Year of fee payment: 7

Ref country code: DE

Payment date: 20141007

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140730

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140730

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140730

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140730

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140730

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141130

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20141010

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140730

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140730

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140730

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140730

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140730

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140730

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602008033549

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141015

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140730

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20141031

26N No opposition filed

Effective date: 20150504

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20141031

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20141031

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20141015

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140730

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 602008033549

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140730

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20151015

REG Reference to a national code

Ref country code: NL

Ref legal event code: MM

Effective date: 20151101

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160503

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140730

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20081015

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20151015

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140730

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20160630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20151102

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20151101