JPH02113219A - Liquid crystal device - Google Patents

Abstract

PURPOSE:To suppress flicker generation which is caused by scan driving of low frame frequency by scanning all scanning lines not by single-time vertical scanning, but plural-time vertical scanning. CONSTITUTION:For example, an information electrode group of upper electrode group 11A and 11B, and a lower electrode group, i.e. scanning electrode group C are formed on a glass substrate respectively to form a matrix, and an FLC material is sandwiched between them. Further, the scanning electrode group consists of C0 - C- and the information electrode group consists of A(A1 - An) and B(B1 - Bn) so that one picture element is composed of an area E where, for example, the scanning electrode C2 and information electrodes A2 and B2 overlap. Then every two scanning electrodes C are applied with a scan select signal in one vertical scan period to make a one picture scan by making one vertical scan plural times. Consequently, the generation of a flicker based upon the scanning of low-frame-frequency can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a display device using ferroelectric liquid crystal, and particularly to a display device suitable for gradation display in which flicker is not noticeable.

[Conventional technology]

Conventionally, liquid crystal display elements are well known in which a scanning electrode group and a signal electrode group are configured in a matrix, and a liquid crystal compound is filled between the electrodes to form a large number of pixels to display images or information. . The driving method for this display element is time-division driving, in which an address signal is selectively and periodically applied to a group of scanning electrodes, and a predetermined information signal is selectively applied in parallel to a group of signal electrodes in synchronization with the address signal. It has been adopted.

Most of these that were put to practical use were, for example, “Applied Fix Letters” (“Applied Ph.
ysics Letters”) 1971, 18
(4) published on pages 127-128 of M, Shut (M
, S c h a d and W, Helfrich (W,
He1frich) co-authored “Voltage Dependant Optical Activity of a
Twisted Nematic Kid Ban Crystal” Voltage Dependent Optical
Activity of a Twisted
Nematic Liquid Crystal”
) shown in TN (TwistedNematic)
It was a model LCD.

In recent years, the use of bistable liquid crystal elements as an improved version of conventional liquid crystal elements has been proposed by both C1ark and Lagerwall in Japanese Unexamined Patent Publication No. 5
This method has been proposed in Japanese Patent No. 6-107216, US Pat. No. 4,367,924, and the like. Bistable liquid crystals are generally chiral smectic C phase (SmC') or H phase (
A ferroelectric liquid crystal having a ferroelectric liquid crystal (SmH') is used, and in these states assumes either a first optically stable state or a second optically stable state in response to an applied electric field;
It also has the property of maintaining its state when no electric field is applied, that is, it has bistability, and it also responds quickly to changes in the electric field, so it is expected to be widely used in fields such as high-speed and memory-type display devices. .

However, the above-described ferroelectric liquid crystal element has a problem in that flicker occurs during multi-branch leg driving. In particular, in European Publication No. 149899, an alternating current voltage is applied with the phase of the scanning selection signal reversed for each writing frame, and as shown in FIG. A multi-blend shift driving method is disclosed in which selective writing is performed in the following frame (arrangement), and in the subsequent frame, selective writing is performed in black (arranged so that the crossed nicols are in a dark state). In addition to the driving method described above, US Pat. No. 4,548,476 and US Pat.
A driving method disclosed in Japanese Patent No. 655561 and the like is known.

In such a driving method, during black selective writing after white selective writing, the white pixel that was selectively written in the previous frame becomes half-selected, and a smaller but effective voltage than the writing voltage is applied. Therefore, in this multiplex puff drive method, when writing black selection, the half selection voltage is uniformly applied to the white selection pixels, which are the background of black characters, for 172 frame periods (one screen which is one frame scanning time). In the white selected pixel to which the half selection voltage is applied, the optical characteristics thereof change every 1/2 frame period. For this reason, in the case of a display in which black characters are written on a white background, the number of pixels that select white is overwhelmingly greater than the number of pixels that select black (and the white background appears to flicker). Also, in contrast to the above-mentioned display in which black characters are written on a white background, flickering is also observed in the case of a display with white characters on black characters.If the normal frame frequency is 30Hz, the above-mentioned half-selection voltage is Since it is applied at a 1/2 frame frequency of 15 Hz, it is perceived by the viewer as flickering, which significantly impairs the display quality.

In particular, when driving a ferroelectric liquid crystal at low temperatures, compared to, for example, scanning driving at a 15 Hz frame frequency at high temperatures,
It is necessary to lengthen the drive pulse (scan selection period), and therefore it is necessary to use scan drive at a low frame frequency such as 5 to 1 OHZ. Therefore, when driving at low temperatures, flicker occurs due to scan driving at a low frame frequency.

[Summary of the invention]

An object of the present invention is to provide a liquid crystal device that suppresses the occurrence of flicker caused by scanning drive at a low frame frequency, and another object of the present invention is to provide a liquid crystal device that realizes gradation display without flicker. There is a particular thing.

Firstly, the present invention provides a liquid crystal element having a ferroelectric liquid crystal and a matrix electrode formed of a scanning electrode and an information electrode; A first drive b in which interlaced application is applied every other or more times, one vertical scan is performed in one vertical scan a plurality of times, and the scan selection signal is applied to non-adjacent scan electrodes in at least two consecutive one vertical scans; There is a feature in a liquid crystal device having a driving means having a second driving means for applying an information signal in synchronization with a scanning selection signal within one vertical scanning period, and secondly, a
, has a scanning electrode formed by a plurality of electrodes and an information electrode formed by a plurality of electrodes crossing the scanning electrode, and the plurality of electrode groups constituting at least one of the scanning electrode and the information electrode are at least two different groups. A scanning selection signal is applied intermittently every two or more lines within one vertical scanning period to the matrix electrode wired with the electrode width, the liquid crystal element having a ferroelectric liquid crystal, and (b) the scanning electrode. A liquid crystal device having a first drive b for performing one vertical scan in one vertical scan, and a second drive means for applying an information signal in synchronization with a scan selection signal within one vertical scan period. Thirdly, it has a scanning electrode formed of a plurality of electrodes and an information electrode formed of a plurality of electrodes crossing the scanning electrode, and constitutes at least one of the scanning electrode and the information electrode. A matrix electrode in which a plurality of electrode groups are wired with at least two different electrode widths, a liquid crystal element having a ferroelectric liquid crystal, and (b) two scan selection signals to the scan electrode within one vertical scan period. Interlaced application is applied at every interval or more, screen scanning is performed in multiple vertical scans, and scan selection signals are not adjacent in at least two consecutive vertical scans.

The liquid crystal device is characterized by a driving means having a first drive b applied and a second driving means applying an information signal in synchronization with a scanning selection signal within one vertical scanning period.

[Detailed description of aspects of the invention]

An embodiment of the present invention will be described using a ferroelectric liquid crystal (hereinafter referred to as FLC).

FIG. 1 shows a first embodiment of the present invention (FIG. 2 shows A-A in FIG. 1).
A' cross-sectional view), upper electrode groups 11A and 11B
(hereinafter referred to as information electrode group) and lower electrode group 12 (hereinafter referred to as scanning electrode group C) are configured to form a matrix with each other, and are formed on glass substrates 13 and 14, respectively.
It has a structure in which C material 15 is sandwiched. Further, as shown in the figure, the scanning electrode group C is C8°C,, C2..., and the information electrode group is A (A I + A 2 + A3...) and B (B,, B2.B3.B4...). ), and the two pixels are area E (electrode line width A>B) surrounded by the dotted line in the figure.
That is, for example, it is constituted by a region E where the scanning electrode C2 and the information electrode A2 and 82 overlap. At this time, the electrode line width is A>B. Each scanning electrode group C and information electrode group A-B
are connected to a power supply unit (not shown) through SWs, and the SWs are also connected to a controller circuit (not shown) that controls the 0N10FF. With this configuration, under the control from the controller circuit, for example, grayscale expression at pixel E is performed as follows. When the common electrode C2 is being scanned, white (hereinafter referred to as W) is A2. When a signal that becomes W is applied to B2, gray l (hereinafter referred to as Grayl) is applied to A2, W1 to B2, black (hereinafter referred to as B
), when a signal is given, Gray 2 (hereinafter referred to as Gray 2)
is B%B to A2 When a W signal is applied to 2, black is A2
．． When a signal that becomes B is applied to B2, FIG. 3 shows the above-mentioned W and Grayl.

It shows the halftone expression of Gray2 and B.

With such a simple configuration, it is possible to express a four-value gray scale on a binary expression FLC.

In a preferred embodiment of the present invention, the plurality of intersections constituting one pixel E are configured with different intersection areas, and in particular, the different intersection areas are 2 for the minimum intersection area of 1:
The ratio is preferably 4:8:16:...:2' (n=number of intersections in one pixel E).

In the present invention, the scanning electrode is divided into two, and when the electrode line width C=B, 8 gray scale levels are possible, and when C≠D, 16 gray scale levels are possible.

Furthermore, when only the information electrode side is divided, the electrode line width A=B, and color filters are provided on A and B so that they have a complementary color relationship, thereby making it possible to display four colors. For example (A=yellow; B=nibble-, [A=magenta; B=
By arranging the complementary colors of Nibreen or (A=cyan; B-red), four-color display of white, black, A color, and B color is possible.

The polarizers 16A and 16B shown in FIG. 2 are arranged with their polarization axes intersecting, and the crossed polarization axes are set so that a dark state is formed in the erasing phase in the driving example described below. Good.

The matrix electrode shown in FIG. 1 is driven by the driving method described below.

FIG. 4 shows the drive waveform used in the present invention. Figure 4 (A
) are respectively identified as a scan selection signal, a scan non-selection signal, a white information signal, and a black information signal. When a white information signal is applied from the information electrode to a pixel on the scan electrode to which the scan selection signal is applied, the Q pixel becomes dark (black) at phase T.
(V2 at phase t, v3+ at phase t2)
A voltage of v2 is applied to erase the black state), and in the subsequent phase t3, voltages V and +V3 are applied to write to a bright (white) state. On the other hand, when a black information signal is applied from the information electrode to a pixel on the same scanning electrode, the pixel is erased to a black state at phase T (v2 at phase t, -v3+ at phase t2).
A voltage of V2 is applied to erase the black state), and in the subsequent phase t3, a voltage V3-V is applied to maintain the previous black state and write the black state.

In this embodiment, the above-mentioned scan selection signal is applied to the scan electrodes in an interlaced manner every two or more lines. FIG. 4(B) shows an example in which a scan selection signal is applied by skipping over every two scan electrodes.

FIG. 4(C) shows a voltage waveform applied to a ferroelectric liquid crystal pixel, and shows an example of a driving waveform that produces the display state shown in FIG. In FIG. 5, . indicates a black writing state, and .largecircle. indicates a white writing state. According to FIG. 5, the scanning electrode 81
The intersection area (pixel area) between ~S and the information electrode 11 is set to twice the intersection area between the scanning electrodes 81~S and the information electrode I2, and pixels P and ~P are formed. As described above, in pixels P to P4, the area ratios between the black state and the white state are different, and four gradations are expressed.

In addition, in the above-described embodiment, a method is shown in which the scanning electrodes are selected in an interlaced manner every two scanning electrodes, but the selection method is not limited to such an interlaced selection method. An interlaced selection method can be used (the number of field scans at this time is N+1). In particular, in the present invention, the interlaced selection method for every eight or more frames is effective in suppressing flicker.

Furthermore, preferred specific examples are shown in FIGS. 4(D) and (E). In the driving example shown in FIG. 4(D), the scan selection signal is applied to every six scan electrodes in an interlaced manner, and the scan selection signal is applied to the first field, the second field, ... the seventh field (the number of field scans is F) of the scan electrode in the order of l (
F+1)th, 5th (F+5)th, 3rd (F+3)th, 7th (F+7)th, 2nd (F+2)th, 6th (
The scanning signal application order is not in accordance with the order of each row, corresponding to the field order, so that the F+6)th and 4th (F+4)th signals are applied. That is, according to the driving example shown in FIG. 4(D), scan selection signals are applied to non-adjacent scan electrodes in seven consecutive fields constituting one vertical scan (-frame scan). Also, Figure 4 (E)
shows another specific example (selection of skipping every third line). The driving examples shown in FIGS. 4(D) and 4(E) are more effective in suppressing flicker than the scanning signal application method shown in FIG. 4(B).

FIG. 6 shows another driving waveform used in the present invention, in which every fourth scanning electrode is selected in an interlaced manner.

Another driving example of the present invention is shown in FIGS. 6(A) and 6(B).

6(A-1) and (A-2) represent the scanning selection signal and the scanning non-selection signal, and FIG. 6(B-1) to (
B-4) represents an information signal synchronized with the scan selection signal. In another driving example of the present invention shown in FIGS. 6(A) and 6(B), every three lines are
The scanning line of the book is scanned, and the scanning line next to the scanning line scanned in the previous vertical scanning period is sequentially scanned in the next vertical scanning period.

Therefore, the number of scanning lines scanned in one vertical scanning period is 1/4 of the total number of scanning lines, and all scanning lines are scanned in four vertical scannings.

Table 1 shows that when forming a white pixel in the drive of FIG. 6, which is another driving example of the present invention, the white selection voltage Sw applied to the pixel and the half selection voltage H at that time are field Fl+
It shows the timing of application at F2+F3+F4...

Table 1 F, F2 F3 F4 F5 F6
According to F7 Table 1, another driving method of the present invention is (8M-7)
During fields F, F9..., a white selection voltage is applied to the pixels (white selection pixels) on the (8M-7)th scanning line S, S8..., and the (8N-3)th scanning line S,
,,S,3... Half selection voltage is applied to the upper pixel (white selected pixel), (8N-6), (8N-5), (8N-
4).

(8N~2), (8N-1), 8Nth scanning line S2°S3+S4. S6. S7. Ss...The upper pixel is not scanned. Therefore, in the driving method shown in FIG. 6, only 1/4 of the total number of scanning lines is scanned in one vertical scanning period (l field), so the field frequency (reciprocal of l vertical scanning period > 1 +) is the timing shown in Table 1. The field frequency f1 of the driving method is twice (f, .=2f,).

In the driving method shown in Figure 6, the number of pixels to which the half-select voltage is applied within one field period is 1/2 compared to the driving example shown in Table 1, so flickering is further prevented. be done.

In this way, the present invention prevents flickering by scanning all the scanning lines in several vertical scans instead of scanning them in one vertical scan. The number of vertical scans required to scan a line may be two or more, and is not limited to that number.

FIGS. 7(A) and 7(B) show another driving example of the present invention.

That is, in the driving example shown in FIG. 6, the scanning lines scanned in the (8M-7)th field are the (8N-7) and (8N-3)th scanning lines, and the scanning lines are scanned in the (8N-6)th field. The scanning lines were (8N-6) and (8N-2)th scanning. In other words, a scanning method was used in which the scanning line following the scanning line scanned in the previous field was scanned in the next field, and in the next field, the next scanning line was sequentially scanned. In this method, as is clear from Table 1, the timing at which the selection voltage is applied is sequentially shifted for each field, and if there is a contrast difference between the selected and half-selected periods, the timing at which the selection voltage is applied to the scanning line is The above-mentioned contrast difference occurs, and as it moves sequentially on the screen, it causes a line flow, which significantly degrades the display quality.

Table 2 shows that the white selection voltage Sw applied to the pixel in the drive shown in FIG. 7 and the half selection voltage H at that time are field FI+
It represents the timing at which F2+F3+F4... is applied.

Table 82 Another drive example of the present invention shown in FIGS. 7(A) and (B) was devised in order to solve the problem that occurs in the timing of applying the selection voltage to the scanning line as described above. be.

That is, as is clear from Table 2, the timing at which the selection voltage is applied is prevented from sequentially shifting in the same direction as much as possible, and flickering is effectively prevented without degrading the display quality.

Further, a preferred specific example is shown in FIG. According to FIG. 11, scan selection signals are applied to non-adjacent scan electrodes in two consecutive fields out of four consecutive fields constituting one vertical scan (-frame scan). In other words, FIG. 11 (A-1) and (A-2) are
The application order of the scan selection signal is shown in FIG. 6 (A-1) and (A-
2) represents a different drive waveform. Figure 11 (B
-1) to (B-4) are information signals used at this time. The driving example shown in FIG. 11 is more effective in suppressing flicker than the driving example shown in FIG. 6.

FIG. 8 is a configuration diagram showing an example of a display device of the present invention. 8
01 is a display panel, which has scanning electrodes 802 and signal electrodes 803.
and a ferroelectric liquid crystal filled between them, and at the intersection of a matrix consisting of a scanning electrode 802 and a signal electrode 803, the orientation of the ferroelectric liquid crystal is caused by an electric field caused by a voltage applied to the electrode. controlled.

804 is a signal electrode drive circuit, and a video data shift register 8041.804 stores serial video data from the information signal line 806. Line memory 804 that stores parallel video data from video data shift register 8041
2. A signal electrode driver 8043 for applying voltage to the signal electrode 803 according to the video data stored in the line memory 8042, and a signal from the control line 811 for switching the voltages v0, 0 and -VD applied to the signal electrode 803. It has an information side power switch 8044 that switches by.

Reference numeral 805 is a scan electrode drive circuit, and a scan address data line 8
Decoder 8051° decoder 80 for receiving the signal from 07 and instructing one scanning electrode among all the scanning electrodes.
A scan electrode driver 8052 for applying a voltage to the scan electrode 802 in response to a signal from the scan electrode 802;
A scanning side power supply switch 8053 is provided to switch the voltage vS + Or -vS applied to 02 by a signal from a switching control line 811.

808 is a CPU which receives clock pulses from an oscillator 809 to control an image memory 810 and sends information signal lines 806, scanning address data lines 807. Controls the transfer of signals to the switching control line 811.

FIG. 9 schematically depicts an example of a ferroelectric liquid crystal cell. 91a and 91b are In2O3, 5n02 and I
A substrate (glass plate) coated with a transparent electrode such as TO (indium tin oxide), between which a liquid crystal molecular layer 9 is oriented perpendicular to the glass surface.
Phase liquid crystal is enclosed. A thick line 93 represents a liquid crystal molecule, and this liquid crystal molecule 93 has a dipole moment (Pi) 94 in a direction perpendicular to the molecule. When a voltage equal to or higher than a certain threshold is applied between the electrodes on the substrates 91a and 91b, the helical structure of the liquid crystal molecules 9 is unraveled, and the orientation direction of the liquid crystal molecules 93 is changed so that the dipole moment (P) 94 is all oriented in the direction of the electric field. can be changed. The liquid crystal molecules 93 have an elongated shape and exhibit refractive index anisotropy in the long axis direction and the short axis direction. Therefore, for example, if polarizers are placed above and below the glass surface in a crossed nicol positional relationship, It is easily understood that this is a liquid crystal optical modulation element whose optical characteristics change depending on the polarity of applied voltage.

Furthermore, if the thickness of the liquid crystal cell is made sufficiently thin (for example, 1
μ), the helical structure of the liquid crystal molecules is unraveled even when no electric field is applied, and the dipole moment Pa or pb is either upward (104a) or downward (104b) as shown in Figure 10. Take. When an electric field Ea or Eb of different polarity above a certain threshold value is applied to such a cell for a predetermined period of time as shown in FIG. The liquid crystal molecules are oriented in either the first stable state 103a or the second stable state 103b according to the direction change.

There are two advantages to using such a ferroelectric liquid crystal as an optical modulation element. Firstly, the response speed is extremely fast, and secondly, the alignment of liquid crystal molecules has a bistable state. To explain the second point using, for example, FIG.
This state is stable even when the electric field is turned off.

Furthermore, when an electric field Eb in the opposite direction is applied, the liquid crystal molecules are oriented to a second stable state 103b and change their orientation, but they remain in this state even after the electric field is turned off. Further, as long as the applied electric field Ea does not exceed a certain threshold value, each orientation state is maintained. In order to effectively realize such fast response speed and bistability, it is preferable for the cell to be as thin as possible, and in general, it is 0.5μ to 0.5μ.
20μ, especially 1μ to 5μ is suitable.

〔Effect of the invention〕

According to the present invention, when a ferroelectric liquid crystal device with a long frame scanning time (for example, a low frame frequency such as 2 to 10 Hz) is applied to a display, it is possible to reduce the occurrence of flicker based on low frame frequency scanning. can be suppressed, and furthermore,
It was possible to realize gradation display based on this flicker suppression effect.

[Brief explanation of drawings]

FIG. 1 is a plan view of a matrix electrode used in the present invention. FIG. 2 is a sectional view taken along line AA' of the FLC element used in the present invention. FIG. 3 is a diagram schematically showing halftones. FIGS. 4(A) to 4(E) are drive waveform diagrams used in the present invention. FIG. 5 is a schematic diagram showing the display state of the matrix electrode structure. Figure 6 (A-1), (A-2), (B-
1), (B-2), (B-3). (B-4) and Figure 7 (A-1), (A-2), (B-
1). (B-2), (B-3), and (B-4) are other drive waveform diagrams used in the present invention. FIG. 8 is a block diagram of the liquid crystal device of the present invention. FIG. 9 and FIG. 1O are perspective views of the ferroelectric liquid crystal cell used in the present invention. Figure 11 (A-1)
, (A-2), (B-1), (B-2), (B-3). (B-4) is another drive waveform diagram used in the present invention. Patent applicant Canon Co., Ltd. @ T, 1. - Ding 1 Ding? Figure 6 (Figure B-〇 (B-2) Figure 7 (B-4) Figure 7 CB-3) or t of ψ〃 / to 7% Figure 11 (E3-Z)

Claims (19)

[Claims] (1) a. A liquid crystal element having a matrix electrode formed by a scanning electrode and an information electrode and a ferroelectric liquid crystal, and b. A scanning selection signal is skipped every second or more during one vertical scanning period to the scanning electrode. a first driving means for performing one screen scan in one vertical scan a plurality of times and applying a scan selection signal to non-adjacent scan electrodes in at least two consecutive one vertical scans, and an information electrode; A liquid crystal device having a driving means having a second driving means for applying an information signal in synchronization with a scanning selection signal. (2) The liquid crystal device according to claim 1, wherein the first driving means includes means for applying a scan selection signal to the scan electrodes in an interlaced manner every fourth or more times within one vertical scanning period. (3) The liquid crystal device according to claim 1, wherein the first driving means includes means for applying a scan selection signal to the scan electrodes in an interlaced manner every 5 to 20 lines within one vertical scanning period. (4) The first driving means interlacely applies a scan selection signal to the scan electrode every N (N=an integer of 2, 3, 4, ...) within one vertical scan period, and (N+1) 2. The liquid crystal device according to claim 1, further comprising means for scanning one screen in one vertical scan. (5) The liquid crystal device according to claim 1, wherein the scan selection signal is a signal having one polarity voltage and the other polarity voltage based on a voltage applied to an unselected scan electrode. (6) a. A scanning electrode formed of a plurality of electrodes and an information electrode formed of a plurality of electrodes crossing the scanning electrode, and a plurality of electrode groups constituting at least one of the scanning electrode and the information electrode. A scan selection signal is applied intermittently to every two or more lines within one vertical scan period to a matrix electrode wired with at least two different electrode widths, a liquid crystal element having a ferroelectric liquid crystal, and (b) a scan electrode. A liquid crystal display device comprising: a first driving means that scans one screen by one vertical scan a plurality of times; and a second driving means that applies an information signal to the information electrode in synchronization with a scan selection signal. Device. (7) The liquid crystal device according to claim 6, wherein the first driving means includes means for applying a scanning selection signal to the first electrode group in an interlaced manner every fourth or more lines within one vertical scanning period. (8) The ratio of the at least two different electrode widths is 1:
7. The liquid crystal device according to claim 6, wherein 2:4:...2^n (n: an integer of 1, 2, 3...). (9) a. A scanning electrode formed of a plurality of electrodes and an information electrode formed of a plurality of electrodes crossing the scanning electrode, and a plurality of electrode groups constituting at least one of the scanning electrode and the information electrode. A scan selection signal is applied intermittently to every two or more lines within one vertical scan period to a matrix electrode wired with at least two different electrode widths, a liquid crystal element having a ferroelectric liquid crystal, and (b) a scan electrode. a first driving means for performing one screen scan in one vertical scan a plurality of times and applying scan selection signals to non-adjacent scan electrodes in at least two consecutive one vertical scans; A liquid crystal device having a driving means having a second driving means for applying an information signal in synchronization with a selection signal. (10) The liquid crystal device according to claim 9, wherein the first driving means includes means for applying a scan selection signal to the scan electrodes in an interlaced manner every four or more times within one vertical scanning period. (11) The liquid crystal device according to claim 9, wherein the first driving means includes means for applying a scan selection signal to the scan electrodes in an interlaced manner every 5 to 20 lines within one vertical scanning period. (12) The first driving means interlacely applies a scan selection signal to the scan electrode every N (N=an integer of 2, 3, 4, ...) within one vertical scanning period, and (N+1) 10. The liquid crystal device according to claim 9, further comprising means for scanning one screen in one vertical scan. (13) The liquid crystal device according to claim 9, wherein the scan selection signal is a signal having one polarity voltage and the other polarity voltage based on a voltage applied to an unselected scan electrode. (14) A. A liquid crystal element having a matrix electrode formed by a scanning electrode and an information electrode and a ferroelectric liquid crystal, and b. A voltage applied to a scanning electrode that is not selected within one vertical scanning period. Scan selection signals having one polarity voltage at the front and the other polarity at the rear are applied in an interlaced manner every two or more lines with reference to , and one screen is scanned by one vertical scan a plurality of times,
A first driving means for applying a scan selection signal to non-adjacent scan electrodes in at least two consecutive vertical scans, and to all or a predetermined information electrode, the scan selection signal is strongly combined with one polarity voltage. A voltage signal that provides a voltage that causes one orientation state of the dielectric liquid crystal is applied, and by combining it with the other polarity voltage of the scanning selection signal, a ferroelectric a second driving means for applying a voltage signal that provides a voltage that causes the other orientation state of the liquid crystal, and applying a voltage signal that provides a voltage that does not change the previous orientation state of the ferroelectric liquid crystal to the other information electrode; A liquid crystal device having a driving means. (15) The liquid crystal device according to claim 14, wherein the first driving means includes means for applying a scan selection signal to the scan electrodes in an interlaced manner at every fourth or more scanning electrodes within one vertical scanning period. (16) The liquid crystal device according to claim 14, wherein the first driving means includes means for applying a scan selection signal to the scan electrodes in an interlaced manner every 5 to 20 scan electrodes within one vertical scanning period. (17) The first driving means interlacely applies a scan selection signal to the scan electrode every N signals (N=an integer of 2, 3, 4, ...) within one vertical scanning period, and (N+1) 15. The liquid crystal device according to claim 14, further comprising means for scanning one screen in one vertical scan. (18) a. A liquid crystal element having a matrix electrode formed by a scanning electrode and an information electrode and a ferroelectric liquid crystal; b. A voltage applied to an unselected scanning electrode within one vertical scanning period. A scan selection signal having one polarity voltage at the front and the other at the rear is applied in an interlaced manner at every two or more lines with reference to the reference, one screen is scanned in one vertical scan a plurality of times, and one screen is scanned in at least two consecutive one vertical scans. A first driving means applies a scan selection signal to non-adjacent scan electrodes and all or a predetermined information electrode, and by combining the scan selection signal with one polarity voltage, one orientation state of the ferroelectric liquid crystal is set. By applying a voltage signal that gives a voltage to be generated and combining it with the other polarity voltage of the scanning selection signal, the other orientation state of the ferroelectric liquid crystal is generated in the selected information electrode among all or the predetermined information electrodes. a second driving means for applying a voltage signal to the other information electrodes to provide a voltage that does not change the orientation state in front of the ferroelectric liquid crystal; A liquid crystal device having polarizing means arranged with their axes crossing each other, the polarizing means being arranged so that a dark optical state is produced when a ferroelectric liquid crystal is aligned in one alignment state. (19) a. A liquid crystal element having a matrix electrode formed by a scanning electrode and an information electrode and a ferroelectric liquid crystal, and b. A scanning selection signal is applied to scanning electrodes that are not serially adjacent to each other within one vertical scanning period. A liquid crystal device comprising: a first drive means that scans one screen by scanning the screen; and a second drive means that applies an information signal to the information electrode in synchronization with a scan selection signal.