WO2000008518A1 - Afficheur ferroelectrique a cristaux liquides et procede de commande de celui-ci - Google Patents

Afficheur ferroelectrique a cristaux liquides et procede de commande de celui-ci Download PDF

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Publication number
WO2000008518A1
WO2000008518A1 PCT/JP1998/003511 JP9803511W WO0008518A1 WO 2000008518 A1 WO2000008518 A1 WO 2000008518A1 JP 9803511 W JP9803511 W JP 9803511W WO 0008518 A1 WO0008518 A1 WO 0008518A1
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WO
WIPO (PCT)
Prior art keywords
liquid crystal
scanning
ferroelectric liquid
period
crystal display
Prior art date
Application number
PCT/JP1998/003511
Other languages
English (en)
Japanese (ja)
Inventor
Shinya Kondoh
Shigekazu Takahashi
Original Assignee
Citizen Watch Co., Ltd.
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 Citizen Watch Co., Ltd. filed Critical Citizen Watch Co., Ltd.
Priority to PCT/JP1998/003511 priority Critical patent/WO2000008518A1/fr
Priority to US09/381,329 priority patent/US6567065B1/en
Priority to EP98936684A priority patent/EP1045270B1/fr
Publication of WO2000008518A1 publication Critical patent/WO2000008518A1/fr

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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
    • G09G2310/00—Command of the display device
    • G09G2310/06—Details of flat display driving waveforms

Definitions

  • the present invention combines a liquid crystal display panel or a liquid crystal light shutter array having a matrix-shaped pixel having a ferroelectric liquid crystal as a liquid crystal layer with a light source capable of emitting a plurality of colors. Also, the present invention relates to a ferroelectric liquid crystal display and a driving method thereof. Background art
  • a liquid crystal cell is used as a shutter, and a light emitting element (eg,
  • the liquid crystal cell is irradiated with light of each color in the order of (red), G (green), and B (blue) according to time TS. The irradiation of these three primary colors is repeated.
  • the liquid crystal cell changes the light transmittance of each display pixel in synchronization with this time TS. That is, according to the information of the displayed color, the R, G, and B light
  • the transmittance is determined by driving the liquid crystal cell. For example, the light transmittance of the liquid crystal cell is set to 50% while R emits time TS light, and the light transmittance of the liquid crystal cell is set to 70% while G emits time TS light. While B emits light for the time TS, the light transmittance of the liquid crystal cell is 90%. Since the normal time TS is very short, each color is not recognized as a single color, but is recognized by humans as a mixture of the respective colors.
  • a light emitting element arranged as a light source behind the liquid crystal shutter emits one color.
  • the time TS is set to about 2 to prevent the color change of light emitted from the light emitting element from flickering and being recognized by human eyes.
  • the amount of light transmitted during the time TS varies depending on on which scanning line the pixel is located. For example, consider the case where the entire liquid crystal display screen is displayed in white. In this case, since the displayed color is white, the liquid crystal is driven so that the transmittance of R, G, and B is 100% for all pixels. For example, a driving voltage is applied to each scan electrode during the time TS during which R emits light. At the next time TS, G emits light, and at the next time TS, B emits light. At each time TS, the liquid crystal is driven, and a desired color (white in this case) is displayed.
  • the scanning electrode Since the timing at which the voltage is applied gradually shifts, the pixels corresponding to the scan electrodes XI, X2,---Xn transmit the R light during the time TS during which R emits light. The time is gradually shortened, and the pixel on the last scanning electrode transmits R light for only a short period. If the time during which the pixel transmits light, that is, the amount of transmitted light, differs depending on the position of the scanning electrode, the entire screen cannot be displayed with uniform luminance, and the desired color cannot be displayed because the color cannot be controlled. For example, since the pixel of the last scanning electrode transmits R light for only a short time, the amount of R light decreases, and the displayed color is different from white.
  • the present invention solves the above-mentioned problems, and provides a ferroelectric liquid crystal display using a successive addition phenomenon, which can display the entire display with uniform brightness and a desired color display, and a driving method thereof.
  • the ferroelectric liquid crystal display of the present invention comprises: a ferroelectric liquid crystal display device in which a ferroelectric liquid crystal is sandwiched between a pair of substrates each having a plurality of scanning electrodes and signal electrodes on opposing surfaces; A light source that emits light of one color successively, and the scanning period during which one color light of the light source emits light (TS) is divided into two periods, and the first period (SC 1) is There is a selection period for determining the display state and a non-selection period for maintaining the display state selected in the selection period. Keep the black display state selected in the selection period Have a non-selection period.
  • the ferroelectric liquid crystal display of the present invention is different from a ferroelectric liquid crystal display device in which ferroelectric liquid crystal is sandwiched between a pair of substrates having N scanning electrodes and M signal electrodes on opposing surfaces.
  • a light source that emits light of one color sequentially, and has an even-numbered scanning period (TS) during emission of light of one color of the light source, and an odd-numbered scanning period of the scanning period.
  • TS even-numbered scanning period
  • forward scanning is performed by scanning the scanning electrodes in the direction from the first scanning line to the Nth scanning line
  • reverse scanning is performed by scanning the scanning electrodes in the scanning direction from the Nth scanning line to the first scanning line.
  • the reverse scanning is performed.
  • the ferroelectric liquid crystal display of the present invention performs a forward scan in which the scanning electrode scans in the direction from the first to the Nth while the light of one color of the light source emits light (TS). While the light of the same color is emitted (TS), reverse scanning is performed by scanning the scanning electrode in the direction from the Nth line to the first line, and the forward scanning and the reverse scanning are alternately repeated.
  • TS light of one color of the light source emits light
  • TS light of one color of the light source emits light
  • reverse scanning is performed by scanning the scanning electrode in the direction from the Nth line to the first line, and the forward scanning and the reverse scanning are alternately repeated.
  • ferroelectric liquid crystal display of the present invention According to the ferroelectric liquid crystal display of the present invention and the method of driving the same, it is possible to perform uniform display without luminance unevenness on the entire display screen. Also, since the color can be controlled accurately, the desired color can be displayed.
  • FIG. 1 is a configuration diagram of a ferroelectric liquid crystal cell and a polarizing plate.
  • FIG. 2 is a diagram showing a change in light transmittance with respect to an applied voltage of a ferroelectric liquid crystal display device.
  • FIG. 3 is a view showing a scanning electrode and a signal electrode formed in a matrix.
  • FIG. 4 is a diagram showing voltage waveforms applied to the scanning electrodes, signal electrodes, and pixels, and the amount of transmitted light (light transmittance) corresponding thereto when white display is performed by a conventional driving method.
  • FIG. 3 is a diagram showing (light transmittance).
  • FIG. 6 is a diagram showing a voltage waveform applied to a plurality of scanning electrodes and a corresponding transmitted light amount (light transmittance) according to a conventional driving method.
  • FIG. 7 is a graph showing the amount of transmitted light of the pixel on each scan electrode when white display is performed by the conventional driving method.
  • FIG. 8 is a configuration diagram of a liquid crystal display used in the embodiment of the present invention.
  • FIG. 9 is a block diagram showing a drive circuit configuration of the ferroelectric liquid crystal display of the present invention.
  • FIG. 10 is a diagram showing a drive waveform and a transmitted light amount (light transmittance) according to the first embodiment of the present invention.
  • FIG. 11 is a graph showing a more detailed relationship between the drive waveform and the amount of transmitted light (light transmittance) in the first embodiment of the present invention.
  • FIG. 12 is a graph showing the amount of transmitted light of pixels on each scanning electrode when white display is performed by the driving method according to the first embodiment of the present invention.
  • FIG. I3 is a diagram showing a drive waveform and a transmitted light amount (light transmittance) according to the second embodiment of the present invention.
  • FIG. 14 is a graph showing the amount of transmitted light of pixels on each scanning electrode when white display is performed by the driving method according to the second embodiment of the present invention.
  • FIG. 6 is a diagram showing a drive waveform in the embodiment.
  • FIG. 16 is a graph showing the amount of transmitted light of pixels on each scanning electrode when white display is performed by the driving method according to the third embodiment of the present invention. Detailed description of the invention
  • FIG. 1 is a diagram showing the arrangement of polarizing plates when a ferroelectric liquid crystal is used as a liquid crystal display device.
  • polarizers 1 a and lb that are aligned with the cross Nicol, either one of the polarization axis a of the polarizer 1 a or the polarization axis b of the polarizer 1 b and the first stable state of the liquid crystal molecules should be established.
  • Position the liquid crystal cell 2 so that it is almost parallel to either of the molecular long axes in the second stable state.
  • the change in transmittance with respect to the voltage is plotted and graphed to draw a loop as shown in FIG.
  • the voltage value at which the light transmittance starts to change is V1
  • the voltage value at which the change in light transmittance is saturated is V2
  • the voltage value at which the change in light transmittance is saturated is V 4.
  • the first stable state is selected when the applied voltage value is equal to or higher than the threshold value of the ferroelectric liquid crystal molecules.
  • the second stable state is selected when a voltage having a polarity opposite to the threshold of the ferroelectric liquid crystal molecule is applied.
  • black display non-transmissive state
  • white display transmissive state
  • black display non-transmission state
  • black display non-transmission state
  • FIG. 3 is a diagram showing an example of the electrode configuration of a liquid crystal panel in which scanning electrodes and signal electrodes are arranged in a matrix on a substrate.
  • This electrode configuration Scan electrodes (X1, X2, X3, --X ⁇ , --X80) and signal electrodes (Yl, ⁇ 2, ⁇ 3, -Ym, --Y220)
  • the shaded area where the signal electrode intersects the pixel (All, Anm).
  • a voltage is applied line by line to the scanning electrodes corresponding to these pixels, and in synchronization with this, a voltage waveform according to the display state is applied from the signal electrodes.
  • FIG. 4 shows an example of a typical driving waveform when a ferroelectric liquid crystal display displays white.
  • the scanning voltage (a) is applied to the scanning electrode (Xn)
  • the signal voltage (b) is applied to the signal electrode (Ym)
  • the resultant voltage (c) is applied to the pixel (Anm).
  • Writing to the pixel is performed by applying to the pixel.
  • the waveform of (d) represents the light transmittance.
  • the first selection period (Se1) in one frame (F) a pulse P1 having a peak value + Vp and a pulse width T equal to or higher than the threshold value and a pulse value 1 Vp and a pulse value equal to or higher than the threshold value
  • a pulse P2 having a width T is applied to the liquid crystal pixels. Assuming that the pulse P 1 in the first half is in the direction of switching the liquid crystal molecules from the second stable state (white display) to the first stable state (black display), the pulse P 2 in the second half is reversed. And switches in the opposite direction from the first stable state to the second stable state.
  • FIG. 5 shows an example of a typical driving waveform when a ferroelectric liquid crystal display displays black. Focusing on the composite voltage (c), the peak values of the pulses P6 and P7 applied to the pixel during the first selection period (Se1) in one frame (F) are below the threshold value.
  • the second stable state obtained earlier is maintained, and the light transmittance is maintained at the same value.
  • the peak values of the pulses P 8 and P 9 applied during the second selection period (S e 2) are above the threshold—V p and + V p, so the second pulse P 9 Switching is performed from the stable state of 2 to the first stable state, and the light transmittance drops to display black.
  • TS be as follows. If the time TS is shorter than about 2 Oms, when the light-emitting element emits R, G, and B light sequentially, the color change of the light emitted from the light-emitting element flickers to the human eye. Not recognized.
  • FIG. 6 is a diagram showing a voltage waveform applied to each scan electrode during a time TS during which R emits light, for example.
  • G emits light in the next TS
  • B emits light in the next TS
  • the liquid crystal is driven in each period TS, and a desired color (white in this case) is displayed.
  • the waveform shown in FIG. 6 is the same as the drive waveform applied to one frame (F) in the case of the white display shown in FIG. (XI), (X2),---(X80)
  • 6 is a waveform showing a change in light transmittance of a pixel corresponding to X80.
  • FIG. 6 shows only the scanning voltage waveform (a) and the light transmittance waveform (d) of the waveforms shown in FIG. 4, and the signal voltage waveform (b) and the composite voltage waveform (c) are omitted. It is.
  • Fig. 6 during the time TS during which R is emitted, the time required for the pixels corresponding to scan electrodes XI, X2, --- X80 to transmit the light of R gradually decreases, and (T80) The period during which light is transmitted is about half of (T1). If the time for which the liquid crystal cell transmits light varies depending on the position of the scanning electrode as described above, the color cannot be controlled and a desired color cannot be displayed. For example, in the case of FIG.
  • the pixel corresponding to X80 transmits R light for a shorter time than the other pixels, so that the amount of transmitted light is reduced, and the luminance of the pixel is reduced.
  • the entire screen cannot be displayed with uniform brightness, and the displayed color is different from white instead of white.
  • Fig. 7 is a graph showing the address of the scanning electrode on the vertical axis and the amount of transmitted light (transmission time) of the pixel on each scanning electrode in the case of white display on the horizontal axis. According to this graph, as the number of scanning electrodes becomes 1, 2, 3, --- 79, and 80, the amount of transmitted light of the pixels on each scanning electrode decreases. Therefore, according to the conventional driving method of the antiferroelectric liquid crystal shown in FIG. 4, it can be seen that the amount of transmitted light of the pixel differs depending on the position of the scanning electrode corresponding to the pixel.
  • An object of the present invention is to provide a ferroelectric liquid crystal display using a successive addition phenomenon capable of displaying and displaying a desired color, and a method of driving the same.
  • FIG. 8 is a diagram showing a liquid crystal panel configuration used in the embodiment of the present invention.
  • the liquid crystal panel used in this embodiment is a sealing material for bonding a pair of glass substrates 11a and 11b having a ferroelectric liquid crystal layer 10 having a thickness of about 2 // to two glasses. 1 2a and 1 2b. Electrodes 13a and 13b are formed on the opposing surface of the glass substrate, on which polymer alignment films 14a and 14b are applied and rubbed.
  • the first polarizing plate is positioned outside the glass substrate so that it is parallel to the polarization axis of the polarizing plate and the long axis of the ferroelectric liquid crystal molecules in the first or second stable state.
  • 15a is provided
  • a second polarizing plate 15b is provided on the outside of the other glass substrate so as to be 90 ° different from the polarizing axis of the first polarizing plate 15a.
  • a backlight 16 is provided, which has three LEDs (R, G, B) that emit light of three colors. The backlight 16 lights up in the order of R, G, and B, and each lighting time is about 16.7 ms.
  • the electrode configuration of the liquid crystal panel is the same as that shown in FIG. 3, and the scanning electrodes and signal electrodes are arranged as shown in FIG. XI, X2, and Xn are scanning electrodes, and Yl, Y2, and Ym are signal electrodes.
  • the shaded area where each intersects is a pixel (A11, Anm).
  • Figure 9 is a block diagram showing the configuration of the drive circuit for a ferroelectric liquid crystal display.
  • the scan electrode to which the scan signal is applied is connected to the scan electrode drive circuit 22 and the display signal is The applied signal electrode is connected to a signal electrode drive circuit 23.
  • the scan electrode drive circuit 22 is supplied with a voltage VX required to drive the scan electrodes of the liquid crystal display from the power supply circuit 24, and the signal electrode drive circuit 23 is supplied with the voltage of the liquid crystal display from the power supply circuit 24.
  • the voltage Vy required to drive the signal electrode is supplied.
  • the control circuit 25 supplies a signal to the scan electrode drive circuit 22 and the signal electrode drive circuit 23 based on the signal from the display data generation source 26, and the scan electrode drive circuit 22 and the signal electrode drive circuit 2 3 supplies a signal composed of voltages Vx and Vy to the liquid crystal display 21 based on the given signals.
  • FIG. 10 is a diagram showing a first embodiment of the present invention.
  • b) shows the combined driving voltage waveform (c) applied to the pixels (A nm) where they intersect, and the change (d) in the amount of transmitted light (T) through the backlight.
  • the liquid crystal driving waveform used in the present invention is a waveform of one of the three primary colors of light, for example, a scanning period of TS during which R emits light, and this scanning period is composed of two periods. I have.
  • the first period (SC 1) includes a selection period and a non-selection period.
  • the selection period (S e) has two phases, and the rest is a non-selection period (NS e).
  • the second period (SC 2) also includes a selection period (S e) and a non-selection period (NS e).
  • the selection period (S e) has two phases, and the rest is the non-selection period (NS e).
  • the pulse width of one phase is set to about 70 / s, and in the first period (SC1), the scan electrode (Xn) has +20 in the first phase of the selection period (Se) during the first period (SC1).
  • a pulse having a voltage value of ⁇ 20 V is applied in the second phase, and no voltage is applied during the non-selection period (NS e).
  • the scanning electrode (X n) is not selected.
  • a voltage of 128 V is applied in the first phase of the selection period (S e).
  • a pulse of +28 V is applied in the second phase.
  • a voltage of 28 V is applied in the non-selection period (NS e). Is not applied.
  • a voltage waveform of 4 V earth is applied to the signal electrode (Ym) according to the display state.
  • the drive voltage waveform and the transmitted light amount when the ferroelectric liquid crystal display performs white display are shown.
  • a voltage of 24 V earth is applied as a composite voltage waveform (C) in the first period (SC 1) in the selection period (Se) (the selection pulse)
  • the ferroelectric liquid crystal becomes In the second stable state, the amount of transmitted light (T) rises to nearly 100% during the selection period (S e).
  • the non-selection period (N Se) the ferroelectric liquid crystal is in the second stable state and the transmittance is maintained at 100%, so that white display is maintained.
  • FIG. 10 is a diagram showing a voltage waveform applied to one scanning electrode.
  • FIG. 11 shows that R is emitted when the antiferroelectric liquid crystal display of the present invention displays white.
  • FIG. 7 is a diagram showing waveforms (Tl), (T2), and (T80) showing changes in the transmittance of the pixel.
  • the voltage waveform applied to scan electrodes X i, X 2, and X 80 is the same as the voltage waveform (a) applied to scan electrode X n in FIG.
  • FIG. 11 shows the transmittance waveforms (Tl), (T2), and (T80) of the pixels corresponding to the scan electrodes XI, X2, and X80, but the transmittance waveforms of the pixels corresponding to the other scan electrodes are as follows. They have almost the same shape, and therefore the amount of transmitted light is the same.
  • the second period during which the ferroelectric liquid crystal performs black display may be provided in a part of the period TS. However, when the second period is set to the length of i Z 2 in the period TS, It is effective.
  • FIG. 12 is a graph showing the amount of transmitted light of a pixel on each scanning electrode when the liquid crystal driving method of the present invention is used.
  • the vertical axis represents the address of the scanning electrode
  • the horizontal axis represents the amount of light transmitted through the pixel on each scanning electrode during the time TS in the case of white display.
  • the time TS during which one color on the back was emitting light was set to 16.7 ms.
  • Each run The time during which the pixels on the inspection electrode were transmitting light was about 8.3 ms. Therefore, it was possible to obtain a display screen having uniform luminance without luminance unevenness and a desired color display.
  • FIG. 13 is a diagram showing the same drive waveform for one frame as FIG.
  • This drive waveform is a conventionally used drive waveform.
  • the voltage waveform applied to the scan electrode is Same, polarity reversed.
  • (a) is the voltage waveform applied to the scanning electrode (Xn)
  • (b) is the voltage waveform applied to the signal electrode (Ym)
  • (c) is the composite voltage waveform applied to the pixel. is there.
  • the light transmittance of the liquid crystal changes depending on the voltage waveform applied to the pixel.
  • This drive waveform is a waveform when the screen is displayed in white.
  • the driving waveform shown in FIG. 13 is applied to the liquid crystal, for example, twice, that is, for two frames while one color (for example, R) is emitting light. Is done.
  • the voltage waveform (a) is applied to the N-th scanning electrode in order from the first scanning electrode with a shift of one.
  • the voltage waveform (a) is applied to the first scan electrode in order from the N-th scan electrode by 1 ZN. Therefore, as described with reference to FIG. 7, in the first frame (F 1), the amount of transmitted light of the pixel decreases as the number of scan electrodes becomes 1, 2, 3,.
  • the display screen has no luminance unevenness and has a uniform luminance. Further, since the color can be controlled accurately, a desired color can be displayed.
  • FIG. 14 shows the same graph as FIG. 7 for the first frame (F 1) and the second frame (F 2).
  • This graph shows the case where the number of the scanning electrodes is 80, and in the first frame, the driving voltage is sequentially applied from the first scanning electrode to the 80th scanning electrode as shown by an arrow dw, In the second frame, as shown by the arrow up, the drive voltage is sequentially applied from the 80th scan electrode to the first scan electrode.
  • the amount of light transmitted through the pixel decreases as the first scanning power and the 80th scanning electrode move.
  • the amount of transmitted light of the pixel increases as it goes from the first scanning electrode to the 80th scanning electrode.
  • the color that is emitting light during this time is R, and the same drive waveform is applied when G emits light next time.
  • the second embodiment using the drive waveform of FIG. 13 while one color is emitting light Is written twice.
  • the scanning voltage is applied in order from the first scanning electrode to the Nth scanning electrode, and the second frame is applied.
  • the scanning period (F2) that is, in the even-numbered scanning period, the scanning voltage is applied in order from the Nth scanning electrode to the first scanning electrode.
  • the order of applying the scanning voltage may be reversed.
  • a drive voltage waveform for a plurality of frames is applied to the liquid crystal during the period TS in which one color emits light.
  • the above problem can be solved by another method using the driving waveform shown in FIG. 13 o
  • FIG. 15 is a diagram showing a third embodiment of the present invention.
  • FIG. 15 shows the scan electrode drive voltage (a) of each frame in FIG. 13 and the colors (R, G, B) that emit light at that time.
  • the waveform (b) applied to the display electrode shown in FIG. 13 (b), the composite voltage waveform (c), and the transmittance waveform (d) are omitted, but the waveform shown in FIG. It is the same.
  • the period of each frame is almost the same as the period TS in which one color emits light, and R, G, and F are sequentially corresponding to each of the frames F1, F2, and F3.
  • B emit light.
  • FIG. 16 is a diagram showing the amount of transmitted light when the driving voltage is applied as described above.
  • the graph shown in FIG. 14 shows the amount of transmitted light when the drive voltage for two frames is applied to the scan electrodes in a different order while one color (for example, R) is emitting light.
  • one frame e.g., R
  • the order in which the drive voltage is applied to the scan electrodes in the first and second emission frames is changed as shown by arrows dw and u. I have. Therefore, the sum of the transmitted light amounts of the pixels of each scanning electrode in the first R light emission frame (F 1) and the second R light emission frame (F 2) is the same, resulting in the same transmitted light amount. No uneven brightness And a desired color can be displayed.

Abstract

L'invention concerne un afficheur ferroélectrique à cristaux liquides comprenant un élément de cristal liquide ferroélectrique qui se compose d'un cristal liquide ferroélectrique intercalé entre deux substrats comprenant une pluralité d'électrodes de balayage et une pluralité d'électrodes de signalisation sur leur surface intérieure respective, et d'une source lumineuse qui émet de manière continue des lumières de plusieurs couleurs différentes. La période (TS) de lecture pendant laquelle une couleur de la source lumineuse est émise, est divisée en deux sections. La première section (SC1) comprend une période de sélection pendant laquelle l'état d'affichage est sélectionné et une période de non sélection durant laquelle l'état d'affichage sélectionné dans la période de sélection est maintenu. La seconde section (SC2) qui correspond au reste de la période de lecture, comprend une période de sélection pendant laquelle un état d'affichage noir est sélectionnée et une période de non sélection pendant laquelle l'état d'affichage noir sélectionné au cours de la première période est maintenu.
PCT/JP1998/003511 1997-06-20 1998-08-06 Afficheur ferroelectrique a cristaux liquides et procede de commande de celui-ci WO2000008518A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/JP1998/003511 WO2000008518A1 (fr) 1998-08-06 1998-08-06 Afficheur ferroelectrique a cristaux liquides et procede de commande de celui-ci
US09/381,329 US6567065B1 (en) 1997-06-20 1998-08-06 Ferroelectric liquid crystal display and method of driving the same
EP98936684A EP1045270B1 (fr) 1998-08-06 1998-08-06 Afficheur ferroelectrique a cristaux liquides et procede de commande de celui-ci

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Application Number Priority Date Filing Date Title
PCT/JP1998/003511 WO2000008518A1 (fr) 1998-08-06 1998-08-06 Afficheur ferroelectrique a cristaux liquides et procede de commande de celui-ci

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
US6847345B2 (en) 2001-09-27 2005-01-25 Citizen Watch Co., Ltd. Liquid crystal optical device

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JPS6385523A (ja) 1986-09-29 1988-04-16 Seiko Instr & Electronics Ltd 強誘電性液晶カラ−電気光学装置
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Publication number Priority date Publication date Assignee Title
US6847345B2 (en) 2001-09-27 2005-01-25 Citizen Watch Co., Ltd. Liquid crystal optical device

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EP1045270A4 (fr) 2001-08-22
EP1045270A1 (fr) 2000-10-18

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