JP2002072168A - Antiferroelectricity liquid crystal display and its driving method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out writing and erasing against pixels properly, even when the image display capacity of an antiferroelectricity liquid crystal display is enlarged. SOLUTION: The antiferroelectricity liquid crystal display driving method carries out the writing and erasing against plural pixels comprised of antiferroelectricity liquid crystal by applying signal voltage selectively on plural signal electrodes 14, while switching plural scanning electrodes 15 of antiferroelectricity liquid crystal display A by the specified number which adopts simple matrix driving method, to selection mode, non-selection mode, and erasing mode according to a fixed order. The erasing mode period of each scanning electrode 15 is the period during which plural scanning electrodes 15, that are different from the scan electrode 15 set in the erasing mode, are set as selection mode one by one.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an antiferroelectric liquid crystal display and a driving method thereof.

[0002]

2. Description of the Related Art Antiferroelectric liquid crystals have a remarkably fast response time as compared with STN liquid crystals, and are suitable for displaying moving images. Further, the antiferroelectric liquid crystal has a wide viewing angle of ± 60 °, good visibility of a display, and a relatively high light utilization rate of 25% and high efficiency. In the field of next-generation mobile phones and mobile devices, since the amount of transmitted data is expected to increase dramatically, displays using anti-ferroelectric liquid crystals, which have a high response speed as described above, will be used in next-generation mobile phones. And mobile video display.

Since the relationship between the light transmittance of an antiferroelectric liquid crystal display and the applied voltage is essential for understanding the present invention, FIG. 6 shows the relationship between the light transmittance and the applied voltage for a transmission type display. Show. FIG. 7 shows a schematic structure of the molecular arrangement of the antiferroelectric liquid crystal corresponding to FIG. The liquid crystal molecules have dipoles in a direction orthogonal to the long axis direction and have birefringence in which the refractive indices are different between the long axis direction and the short axis direction. As shown in FIG. 6, the antiferroelectric liquid crystal is
The antiferroelectric state is maintained until the voltage exceeds the saturation voltage Vsat from the state of no electric field. In this antiferroelectric state, FIG.
As shown in (I), the layers adjacent to each other are oriented so that the directions of spontaneous polarization are opposite to each other with respect to the layer normal. At this time, as a whole, the spontaneous polarizations cancel each other. Since the polarizing axes of the two polarizing plates on the light incident side and the light emitting side provided in the liquid crystal display are in directions perpendicular to each other, in the above-described antiferroelectric state, the apparent tilt of the liquid crystal molecules is apparent. The angle is 0 ° and no light passes through this liquid crystal display.

On the other hand, when the voltage applied to the antiferroelectric liquid crystal exceeds the saturation voltage Vsat, the liquid crystal enters a ferroelectric state. In this ferroelectric state, as shown in FIGS. 7 (II) and (III),
The liquid crystal molecules are tilted by a predetermined angle in the same direction for each layer, and light passes through the liquid crystal display with a predetermined transmittance. This characteristic has a hysteresis property, and the ferroelectric state is maintained and a predetermined transmittance is maintained until the applied voltage becomes lower than the threshold voltage Vth. Further, the above characteristics can be obtained regardless of whether the applied voltage is positive or negative.

As a driving method of the antiferroelectric liquid crystal display, a simple matrix method can be adopted similarly to the STN liquid crystal display, and an image can be displayed by a line sequential method. However, in the antiferroelectric liquid crystal display, there are three types of driving modes, a selection mode (writing mode), a non-selection mode, and an erasing mode. The selection mode is a mode for writing to a pixel formed of an antiferroelectric liquid crystal, and the writing is performed by bringing the antiferroelectric liquid crystal into a ferroelectric state. The non-selection mode is a mode for maintaining the writing state of the pixel. The erasing mode is a mode for erasing the writing of the pixel, and the erasing is performed by returning the antiferroelectric liquid crystal to the antiferroelectric state. When an antiferroelectric liquid crystal display having such three types of driving modes is driven by a line-sequential system, a predetermined number of scanning electrodes (horizontal electrodes or common electrodes) are selected and deselected in a predetermined order. , And erasing mode, a signal voltage is selectively applied to a plurality of signal electrodes (vertical electrodes or segment electrodes).

[0006]

As described above, the antiferroelectric liquid crystal has good responsiveness, and changes from the antiferroelectric state to the ferroelectric state quickly. However, the speed of returning from the ferroelectric state to the antiferroelectric state has the property of being greatly affected by temperature, and the lower the temperature, the slower the speed of returning. More specifically, the time required to return from the ferroelectric state to the anti-ferroelectric state is about 1 msec at 25 ° C., and about 10 msec at 0 ° C. This means that when an antiferroelectric liquid crystal display is used under low-temperature conditions, it is difficult to erase pixels at high speed.

Means for quickly returning from the ferroelectric state to the antiferroelectric state and erasing pixels at high speed include:
There is a means for applying a voltage of a reverse polarity to the extent that writing is not performed on the liquid crystal. According to such a means, even under a low temperature condition (for example, 0 ° C.), the time required for the above-mentioned recovery can be shortened to about 1 to several msec.

[0008] However, even when such means are employed, there are the following problems in displaying moving images. That is, for example, when displaying a moving image of 30 frames / second on a liquid crystal display using 480 scanning electrodes, the display time of one frame is 33.3 msec. The time is 0.0694 msec.
Therefore, even if the time required to return from the ferroelectric state to the antiferroelectric state can be reduced to 1 msec by applying the above-described voltage of the opposite polarity, this time is the allocated time for one scan electrode. Greatly exceeds
The liquid crystal cannot be properly returned from the ferroelectric state to the antiferroelectric state within this allocated time, and it is difficult to erase the written state of the pixel. For these reasons, it has conventionally been difficult to increase the image display capacity of the antiferroelectric liquid crystal display.

The present invention has been conceived in view of such circumstances, and it is possible to appropriately perform writing and erasing on pixels even when the image display capacity is increased. An object of the present invention is to provide a driving method of an antiferroelectric liquid crystal display and an antiferroelectric liquid crystal display.

[0010]

DISCLOSURE OF THE INVENTION In order to solve the above problems, the present invention employs the following technical means.

A method of driving an antiferroelectric liquid crystal display provided by a first aspect of the present invention is a method of driving a plurality of scanning electrodes of an antiferroelectric liquid crystal display employing a simple matrix driving method by a predetermined number. By selectively applying a signal voltage to a plurality of signal electrodes while sequentially switching to a selection mode, a non-selection mode, and an erasing mode, writing and erasing of a plurality of pixels composed of antiferroelectric liquid crystal can be performed. In the method for driving an antiferroelectric liquid crystal display, a plurality of scanning electrodes different from the scanning electrodes set to the erasing mode are sequentially set to the selection mode during the erasing mode period of each scanning electrode. It is characterized by a period.

In the present invention, the selection mode is
The non-selection mode is a mode in which a scan voltage equal to or higher than a predetermined saturation voltage is applied to the scan electrode, and the non-selection mode sets a scan voltage intermediate between the predetermined threshold voltage having a smaller absolute value than the saturation voltage and the saturation voltage. The erasing mode is a mode in which a scanning voltage having an absolute value smaller than the threshold voltage is applied to the scanning electrode. Of course, the voltage actually applied to the antiferroelectric liquid crystal is a potential difference between the scanning voltage applied to the scanning electrode and the signal voltage applied to the signal electrode. The contents of the selection mode, the non-selection mode, and the erasing mode may be different from the contents described above.

In the method of driving an antiferroelectric liquid crystal display according to the present invention, the erase mode period of each scan electrode can be made longer than the select mode period assigned to one scan electrode. That is, the erasing mode period can be set to a time necessary for returning the antiferroelectric liquid crystal in the ferroelectric state to the antiferroelectric state. Therefore, even if the selection mode period assigned to one scan electrode of the antiferroelectric liquid crystal display is shortened by increasing the image display capacity of the antiferroelectric liquid crystal display, regardless of this, In addition, it is possible to appropriately perform the erasing process of writing the pixel, and to perform an appropriate image display. As a result, according to the present invention, the image display capacity of the antiferroelectric liquid crystal display can be increased.

In a preferred embodiment of the present invention, when any one of the plurality of scanning electrodes is set to the selection mode, another plurality of scanning electrodes to be set to the selection mode after the scanning electrode. Set to erase mode.

According to such a configuration, each scan electrode can be set to the erasing mode immediately before setting to the selection mode, and writing is immediately performed on the pixels after the erasing process. Becomes possible.

In the antiferroelectric liquid crystal display provided by the second aspect of the present invention, the antiferroelectric liquid crystal is sealed between a pair of substrates having a plurality of scanning electrodes and a plurality of signal electrodes. Accordingly, a liquid crystal panel in which a plurality of pixels are arranged in a matrix and a plurality of the plurality of scanning electrodes of the liquid crystal panel are switched to a selection mode, a non-selection mode, and an erasing mode by a predetermined number in a fixed order. A control means for selectively applying a signal voltage to the plurality of signal electrodes to perform writing and erasing on the plurality of pixels, comprising: an anti-ferroelectric liquid crystal display, The control means sequentially sets the plurality of scan electrodes other than the scan electrodes set in the erase mode to the selection mode during the erase mode period of each scan electrode. It is characterized by being configured to be between.

According to the antiferroelectric liquid crystal display having such a configuration, the same effect as obtained by the driving method of the antiferroelectric liquid crystal display provided by the first aspect of the present invention can be expected. .

Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to the drawings.

FIGS. 1 and 2 show an example of an antiferroelectric liquid crystal display according to the present invention. The antiferroelectric liquid crystal display A of this embodiment is of a transmission type using a backlight (not shown), and its driving method is a simple matrix method. The antiferroelectric liquid crystal display A includes a liquid crystal panel 1 and two types of drivers 2A and 2A.
B.

As best shown in FIG. 2, the liquid crystal panel 1 includes a pair of substrates 10A and 10B, a liquid crystal layer 11,
It comprises a pair of polarizing plates 12a and 12b. The substrates 10A and 10B are rectangular and made of a transparent glass or resin film. Substrates 10A, 10B
A plurality of signal electrodes 14 and a plurality of scanning electrodes 15 are formed on each of the inward faces. These are all formed as transparent electrodes made of an ITO film or the like. As is well shown in FIG.
Reference numeral 4 denotes a band extending in a certain direction, which is arranged in parallel in the short direction (FIG. 1 is a perspective view showing the signal electrode 14 and the scanning electrode 15 by solid lines). Each signal electrode 14
Is a terminal for connecting with the driver 2B. The plurality of scanning electrodes 15 have a band shape extending in a direction orthogonal to each signal electrode 14, and are arranged in parallel to the direction in which each signal electrode 14 extends. One end 15a in the longitudinal direction of each scanning electrode 15 is a terminal for connecting with the driver 2A.

In FIG. 2, the liquid crystal layer 11 is formed by sealing an antiferroelectric liquid crystal between a pair of substrates 10A and 10B. The phase of this antiferroelectric liquid crystal is a smectic phase that exhibits ferroelectricity and antiferroelectricity,
It has the same characteristics as those described with reference to FIGS. In the liquid crystal layer 11, a portion where the scanning electrode 15 and the signal electrode 14 cross and face each other corresponds to a pixel for liquid crystal display, and the pixels are arranged in a matrix. The liquid crystal layer 11 is sandwiched between a pair of alignment films 13a and 13b covering the signal electrode 14 and the scanning electrode 15. These alignment films 13a and 13b are for aligning liquid crystal molecules in a certain direction, and they have a parallel alignment in which the alignment directions coincide with each other. The polarizing plates 12a and 12b are provided on the outward surfaces of the pair of substrates 10A and 10B, and the polarization axis of the polarizing plate 12b matches the alignment direction of the alignment films 13a and 13b. Polarizing plate 1
The polarization axis of 2a is orthogonal to the polarization axis of the polarizing plate 12b. The liquid crystal panel 1 is configured for monochrome display. However, by additionally providing an RGB color filter to the liquid crystal panel 1, a display capable of color display can be provided.

The driver 2A corresponds to a so-called horizontal driver or common driver. Driver 2
B corresponds to a so-called vertical driver or segment driver. These are all configured using one or more IC chips. Driver 2
A and 2B are tabs 3A having wiring portions 20a and 20b,
The terminal portions 15a of the scanning electrodes 15 and the terminal portions 14a of the signal electrodes 14 are electrically connected to each other via 3B. Of course, the present invention is not limited to the means for connecting the drivers 2A and 2B using the tabs 3A and 3B. For example, the drivers 2A and 2B are directly mounted on the substrate of the liquid crystal panel 1, and the wiring formed on the substrate is formed. The drivers 2A and 2B may be conductively connected to each scanning electrode 15 and each signal electrode 14 via a pattern.

The drivers 2A and 2B are wired and connected to a CPU and other external devices (not shown), and receive necessary power, data signals of display images, and other control signals. I have. Driver 2A, 2
B is configured to apply a scanning voltage to each scanning electrode 15 and a signal voltage to each signal electrode 14 so as to display a desired image in a line-sequential manner, as described later.

Next, the specific operation processing of the drivers 2A and 2B of the antiferroelectric liquid crystal display A will be described, and the operation of the antiferroelectric liquid crystal display A will be described.

In order to make the description of the present embodiment easy to understand, the plurality of scanning electrodes 15 shown in FIG. 1 are sequentially arranged from the upper side to the lower side in the order of the first scanning electrode, the second scanning electrode, and the third scanning electrode. Scan electrode ... Multiple signal electrodes 14
For the first one of them
This is a signal electrode.

In order to drive the antiferroelectric liquid crystal display A, a plurality of scanning electrodes 15 are connected to a plurality of signal electrodes 14 by switching the plurality of scanning electrodes 15 to a selection mode, a non-selection mode and an erasing mode, for example, one by one. The signal voltage is selectively applied. The procedure of voltage application in this case will be described below as an example of a voltage application mode to the fifth scanning electrode 15 and the first signal electrode 14 corresponding to one pixel G indicated by cross hatching in FIG.

First, the driver 2 is connected to the fifth scanning electrode 15.
By controlling the threshold voltage A, as shown in FIG.
th (see FIG. 6), a scan voltage less than
The scanning electrode 15 is set to the erase mode for a predetermined time T1. The erasing mode time T1 is a time when a plurality of scanning electrodes 15 different from the fifth scanning electrode 15 are sequentially switched to the selection mode, and specific values thereof will be described later.
Even during the erasing mode of the fifth scanning electrode 15, the other plurality of scanning electrodes 15 are sequentially set to the selection mode. Therefore, as shown in FIG. By the control of 2B, the signal voltage is selectively applied sequentially. In the erase mode, as shown in FIG. 3C, the voltage applied to the pixel G (the fifth scan electrode 15
(The potential difference between the first signal electrode 14 and the first signal electrode 14) does not exceed the threshold voltage Vth.

Although the signal voltage shown in FIG. 3B is a pulse having positive and negative potentials, the present invention is not limited to this, and a signal voltage of only a positive potential or only a negative potential is used. Can also. Further, the value of the signal voltage does not need to be constant, and it is possible to give a shade of light and shade to the display image by changing the value, and such a configuration may be adopted.

After the erasing mode, a scanning voltage exceeding the saturation voltage Vsat shown in FIG. 7 is applied to the fifth scanning electrode 15 under the control of the driver 2A, and the fifth scanning electrode 15 is turned on for a predetermined time T2. Only select mode. At this time, a signal voltage P1 for setting the pixel G to black or white is applied to the first signal electrode 14. This signal voltage P1
However, for example, if the voltage has the opposite polarity to the scanning voltage, the voltage applied to the liquid crystal of the pixel G exceeds the saturation voltage Vsat, and the liquid crystal enters a ferroelectric state. Thereafter, a scanning voltage having an intermediate value between the threshold voltage Vth and the saturation voltage Vsat is applied to the fifth scanning electrode 15 for a predetermined time T3, and the fifth scanning electrode 15 is set to the non-selection mode. During this non-selection mode, the ferroelectric state of the pixel G is maintained. In such a ferroelectric state, the pixel G transmits light, as understood from the description in FIGS. 6 and 7. Unlike the above, when the signal voltage P1 is a voltage having the same polarity as the scanning voltage, the voltage applied to the liquid crystal of the pixel G does not exceed the saturation voltage Vsat, so that the liquid crystal remains in the antiferroelectric state. , The pixel G is in a state of not transmitting light.

When the image display of the second frame is performed after the end of the first frame for displaying the moving image, as shown in FIG. A scanning voltage having a polarity opposite to that of the first frame, which is less than the threshold voltage Vth, is applied to the fifth scanning electrode 15. As a result, the fifth scan electrode 15 is set to the erasing mode for the predetermined time T1. As described above, if the polarity of the applied voltage is reversed, even if the antiferroelectric liquid crystal display A is used under relatively low temperature conditions, the liquid crystal in the ferroelectric state is turned into the antiferroelectric state. Can be quickly returned to. After the erase mode, similarly to the first frame, a voltage exceeding the saturation voltage Vsat and a voltage having an intermediate value between the threshold voltage Vth and the saturation voltage Vsat are sequentially applied to the fifth scan electrode 15, and this fifth scan electrode 15 is applied. The electrode 15 is sequentially set to a selection mode and a non-selection mode. Thereafter, such an operation is repeated. In the first frame and the second frame,
The polarity of the voltage applied to the liquid crystal is opposite, and the arrangement of the liquid crystal molecules is alternately switched to the mode shown in FIGS. 7 (II) and 7 (III). For this reason, it is possible to prevent ions from being biased inside the liquid crystal, and to prevent screen burn-in as seen in a display using a ferroelectric liquid crystal.

The driver 2A applies the above-described scanning voltage to each of the plurality of scanning electrodes 15. A specific procedure at that time will be described with reference to FIG. However, in the figure, in order to facilitate understanding of the contents, the time of the erasing mode is set to a relatively short time corresponding to five steps (time during which the scanning electrodes of five lines are switched to the selection mode).

As shown in the figure, each of the first to n-th scanning electrodes 15 is switched to a selection mode, a non-selection mode, and an erasing mode in a certain order. In the second step in which is set to the selection mode, the second scan electrode 15 to the sixth
The five scanning electrodes 15 up to the scanning electrode 15 are collectively set to the erasing mode. In the subsequent third step, while the second scan electrode 15 is set to the selection mode,
The seventh scan electrode 15 is newly added to the erase mode. Thereafter, in the same manner, at each step, the next scan electrode 15 after the scan electrode 15 previously set to the select mode is switched to the select mode, and another scan electrode 15 is switched to the new erase mode. The five scan electrodes 15 which are switched and are located at the subsequent stage of the scan electrode 15 which is set to the selection mode are always set to the erase mode.

According to such a procedure, each scanning electrode 15
Is set to the erase mode for five step periods before the selection mode is set (for example, focusing on the fifth scanning electrode 15, the fifth scanning electrode 15 before the fifth scanning electrode 15 is set to the selection mode). The erase mode is maintained from the first step to the fifth step.) Therefore, it is possible to appropriately secure the time required for returning the antiferroelectric liquid crystal from the ferroelectric state to the antiferroelectric state. Of course, the time when the scanning electrode 15 is in the erase mode is 5
The time for switching the scanning electrodes 15 for the line to the selection mode is not limited to the time, and can be longer.

For example, when the total number of the scanning electrodes 15 is 480 lines and a moving image of 30 frames / second is displayed, the allocation time for one scanning electrode is 0.0694 msec. It is. On the other hand, in the present embodiment, for example, 15
The time during which the scanning electrodes 15 for one line are sequentially switched to the selection mode can be set as the erasing mode time for the scanning electrodes 15 for one line, whereby the time for the erasing mode of each scanning electrode 15 can be reduced. It can be 1 msec or more. If it takes 1 msec for the liquid crystal to return from the ferroelectric state to the antiferroelectric state, it is possible to appropriately perform such a return within the erasing mode time. As understood from the above, according to the present embodiment, the total number of the scanning electrodes 15 is increased in order to increase the display image capacity of the antiferroelectric liquid crystal display A. As a result, one scanning electrode Even if the assignment time of the selection mode is shortened, the erasure can be appropriately terminated before writing to the pixel, and an appropriate moving image can be displayed.

The contents of the present invention are not limited to the above embodiment. The specific configuration of each part of the antiferroelectric liquid crystal display according to the present invention can be variously changed in design. Further, the specific procedure of the method of driving the antiferroelectric liquid crystal display according to the present invention can be variously changed.

As described above, in the present invention, the erasing mode time of each scanning electrode can be lengthened as necessary, and the specific value is not questioned. However, the longer the erase mode time, the more noticeable the flicker becomes. Therefore, it is preferable to suppress the erase mode time to about 8 msec or less.

The antiferroelectric liquid crystal display according to the present invention is not limited to the transmissive type, but may be configured as a reflective type display. When configured as a reflective display, for example, as shown in FIG. 5, the scanning electrode 15 is made of an electrode capable of reflecting light, and the polarizing plate 12a, Substrate 10
A, and the light transmitted through the liquid crystal layer 11
(Refer to FIG. 1 schematically showing the layer structure of the liquid crystal layer 11). In this case, two polarizing plates are not used,
Only one polarizing plate 12a is used. In the case of this transmissive display, natural light or the liquid crystal panel 1
An image is displayed using a front light (not shown) arranged in front of A.

Of course, in the present invention, the antiferroelectric liquid crystal display can be of the two-screen split drive system employed in the STN liquid crystal display. After the adoption, the driving method according to the present invention can be further applied. In the case of the two-screen split drive system, of the plurality of scanning electrodes of the liquid crystal panel, for example, two scanning electrodes, one each for the upper screen and the lower screen, are simultaneously set to the selection mode. .

[Brief description of the drawings]

FIG. 1 is a front view showing an example of an antiferroelectric liquid crystal display according to the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

3A is a time chart for a scanning voltage, FIG. 3B is a time chart for a signal voltage, and FIG. 3C is applied to the liquid crystal as a total of the scanning voltage and the signal voltage. It is a time chart of a voltage.

FIG. 4 is a diagram showing a procedure for switching modes of a plurality of scanning electrodes.

FIG. 5 is a sectional view showing another example of the antiferroelectric liquid crystal display according to the present invention.

FIG. 6 is a graph showing a relationship between an applied voltage of an antiferroelectric liquid crystal and light transmittance.

FIG. 7 is an explanatory diagram schematically showing a change in molecular arrangement of an antiferroelectric liquid crystal.

[Explanation of symbols]

 A Antiferroelectric liquid crystal display 1 Liquid crystal panel 2A, 2B Driver (control means) 10A, 10B Substrate 11 Liquid crystal layer 14 Signal electrode 15 Scanning electrode

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09G 3/20 623 G09G 3/36 3/36 G02F 1/137 510 F-term (Reference) 2H088 GA04 HA12 HA18 HA28 JA20 MA01 MA10 2H093 NA14 NA22 NA45 NA47 NC16 ND12 NE06 NF13 NF20 5C006 AC24 AC28 AF33 AF42 AF44 BA13 BB12 BC16 FA12 5C080 AA10 BB05 DD08 EE26 FF12 JJ02 JJ06 JJ05 JJ06

Claims (4)

[Claims] An antiferroelectric liquid crystal display employing a simple matrix driving method switches a plurality of scanning electrodes in a predetermined order in a predetermined order to a selection mode, a non-selection mode, and an erasing mode, and a plurality of signal electrodes. A method for driving an antiferroelectric liquid crystal display in which writing and erasing are performed on a plurality of pixels composed of antiferroelectric liquid crystal by selectively applying a signal voltage to each of The mode period is a period in which a plurality of scan electrodes different from the scan electrodes set to the erase mode are sequentially set to the selection mode,
Driving method of antiferroelectric liquid crystal display. 2. The selection mode is a mode in which a scan voltage equal to or higher than a predetermined saturation voltage is applied to the scan electrodes. The non-selection mode includes a predetermined threshold voltage having an absolute value smaller than the saturation voltage and the predetermined threshold voltage. 2. The method according to claim 1, wherein the scan voltage is a mode in which an intermediate scan voltage with a saturation voltage is applied to the scan electrode, and the erasing mode is a mode in which a scan voltage having an absolute value smaller than the threshold voltage is applied to the scan electrode. The driving method of the antiferroelectric liquid crystal display according to the above. 3. When one of the plurality of scan electrodes is set to the selection mode, the other plurality of scan electrodes to be set to the selection mode after the scan electrode are set to the erase mode. Item 3. The method for driving an antiferroelectric liquid crystal display according to item 1 or 2. 4. A liquid crystal in which a plurality of pixels are arranged in a matrix by filling an antiferroelectric liquid crystal between a pair of substrates having a plurality of scanning electrodes and a plurality of signal electrodes. By selectively applying a signal voltage to the plurality of signal electrodes while switching the plurality of scanning electrodes of the liquid crystal panel to a selection mode, a non-selection mode, and an erasing mode in a predetermined order by a predetermined number. Control means for performing writing and erasure on the plurality of pixels, comprising: an antiferroelectric liquid crystal display, wherein the control means sets an erasure mode period of each of the scanning electrodes to:
An anti-ferroelectric liquid crystal display, wherein a plurality of scan electrodes different from the scan electrodes set in the erase mode are sequentially set in the select mode.