JPH02126224A - Liquid crystal device - Google Patents

Abstract

PURPOSE:To suppress flicker generation due to scan driving of low frame frequency by applying a scan select signal to scanning electrodes which do not adjoin to each other in series and making a scan for one image plane, and making a one-gradation image plane scan be plural one-image-plane scans. CONSTITUTION:A liquid crystal element which has a matrix electrode composed of a scanning electrode Cn and information electrodes 11A and 11B and ferroelectric liquid crystal, a scan select signal which is applied to the scanning electrode is applied to every 5th scanning electrode, and thus the scan select signal is applied to the scanning electrodes which are not adjacent in six continuous fields. Namely, every 5th scan is selected and one subframe scan (one-image- plane scan) is made at a 6th field scan to set a scan select period long at low temperature, thereby suppressing the generation of a flicker due to the scan driving of low frame frequency eventually even by the scan driving of low frame frequency (e.g., 5 - 10 Hz frame frequency).

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a liquid crystal device for gradation display in a display panel, and more particularly to a liquid crystal television using a bistable liquid crystal material, particularly a ferroelectric liquid crystal. The present invention relates to a liquid crystal device for gradation display on display panels such as.

[Prior art]

In a liquid crystal television panel using a conventional active matrix driving method, thin film transistors (TPTs) are arranged in a matrix for each pixel, and a gate-on pulse is applied to the TPTs to make the source and drain conductive, and at this time the video image signal is is applied from the source and stored in the capacitor, and the liquid crystal (for example, T
twistedNematic-TN-liquid crystal) is driven,
At the same time, gradation display is performed by modulating the voltage of the video signal.

However, in active matrix drive type television panels using such TN liquid crystals, the TPT used is
Because TPT has a complicated structure, it requires a large number of structural steps (and high manufacturing costs), and the thin film semiconductors (e.g. polysilicon, amorphous silicon) that make up TPT can be spread over a large area. There are problems in that it is difficult to form a film over a long period of time.

On the other hand, a passive matrix drive type display panel using TN liquid crystal is known as a device that can be manufactured at low manufacturing cost. 1 while scanning
The time during which an effective electric field is applied to one selection point (duty ratio) decreases at a rate of 1/N, which causes crosstalk and has the disadvantages of not providing a high-contrast image. Moreover, when the duty ratio becomes low, it becomes difficult to control the gradation of each pixel by voltage modulation, making it unsuitable for display panels with a high density of wiring, especially liquid crystal television panels.

By the way, the use of bistable liquid crystal elements as an improved type of conventional liquid crystal elements has been developed by both C1ark and Lagerwal+.
Publication No. 56-107216, U.S. Patent No. 436792
This is proposed in Specification No. 4, etc. Bistable liquid crystals are generally chiral smectic C phase (SmC water) or H
A ferroelectric liquid crystal having a phase (SmH*) is used, and in these states, it adopts 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 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. There is.

However, the above-mentioned ferroelectric liquid crystal device has a problem in that flicker occurs when driving the multiplexed screen. In particular, in European Publication No. 149899, an alternating current voltage with the phase of the scanning selection signal inverted is applied for each writing frame, and white (crossed nicols arranged so as to be in a bright state) selective writing is performed in the previous frame. conduct,
A multi-blend shift driving method is disclosed in which selective writing of black (cross nicols are arranged so as to be in a dark state) is performed in the subsequent frame. In addition to the above-mentioned driving method, U.S. Pat.
Driving methods disclosed in Japanese Patent No. 548,476 and US Pat. No. 4,855,561 are 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, a half-selection voltage is uniformly applied to the white selection pixels that form the background of black characters at a 1/2 frame period (one frame scanning time). The optical characteristic of the white selected pixel to which the half selection voltage is applied changes every 1/2 frame period. Therefore, 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 larger than the pixels that select black, and the white background appears to flicker. Further, 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 in which black characters are written on a white background. When the normal frame frequency is 30Hz, the above half selection voltage is 1/2
Since it is applied at a 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, it is necessary to use a longer drive pulse (scan selection period) than when driving at a high temperature with a 15 Hz frame frequency.
For this reason, it was necessary to perform scanning drive at a low frame frequency such as 5 to 10 Hz. Therefore, when driving at low temperatures, flicker occurs due to scan driving at a low frame frequency.

[Summary of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal device for gradation display in which flicker caused by low frame frequency scanning drive is suppressed.

Another object of the present invention is to provide a liquid crystal device for gradation display in which image deletion is prevented.

The present invention firstly provides the following steps: a. A liquid crystal element having a matrix electrode formed of a scanning electrode and an information electrode and a ferroelectric liquid crystal, and b. A scanning selection signal is serially applied to scanning electrodes that are not adjacent to each other. a first means for scanning one screen by scanning one screen and scanning one gradation screen by scanning one screen a plurality of times; and a second means for applying an information signal to the information electrode in synchronization with the scan selection signal. The first feature of the liquid crystal device having a driving means is that a. a liquid crystal element having a matrix electrode formed of a scanning electrode and an information electrode and a ferroelectric liquid crystal, and b. A first means of interlacing and applying a scan selection signal every two or more lines within a scanning period, performing one screen scan with one vertical scan a plurality of times, and scanning one gradation screen with one screen scan a plurality of times. and a second feature of the liquid crystal device having a driving means having a second means for applying an information signal to the information electrode in synchronization with the scanning selection signal, and thirdly, a. a matrix electrode in which a plurality of electrodes constituting at least one of the scanning electrode and the information electrode are wired with at least two different electrode widths, and a liquid crystal element having a ferroelectric liquid crystal; A first means for performing one screen scan by serially applying a scan selection signal to the scan electrodes that do not match, and performing one gradation screen scan by performing one screen scan a plurality of times; A third feature is provided in a liquid crystal device having a driving means having a second means for applying an information signal in synchronization.

[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' is a sectional view), and the upper electrode group 11A and I
IB (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, with FLC material 15 sandwiched between them. The structure is designed to be Also, as shown in the figure (, scanning electrode group C is Co, C,, C2..., information electrode group is A (A,, A2゜A3...) and B.
(BIn B2+ B3+ B4...), and one pixel consists of the area E (N pole 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 electrodes A2 and B2 overlap. At this time, the electrode line width is A>B. Each scanning electrode group C and information electrode group A
-B are each connected to a power supply unit (not shown) via a SW, and the SW is also connected to a controller circuit (not shown) that controls the 0N10FF. With this configuration, under control from the controller circuit,
For example, gray scale expression at pixel E is implemented as follows. When the common electrode C2 is being scanned, white (hereinafter W)
) is when a signal that becomes W is given to A2+82, respectively,
Gray l (hereinafter referred to as Grayl) is gray 2 (hereinafter referred to as ray
2) When A2 is given a B signal and B2 is given a W signal, black is A.
2. When a signal that becomes B is given to B2, FIG. 3 shows the above WSGrayl.

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 Cf-D, 16 gray scale levels are possible.

Also, when dividing only the information electrode side, the electrode line width is A=B, and the color filter is A,! :H are provided in a complementary color relationship, making it possible to display four colors. For example, [A=yellow, B=nibble, [A=magenta;
By arranging the complementary colors of B=nibreen or (A=cyan; B=nirelad), white, black, the color of A and B
It is possible to display four colors.

Further, the polarizers 16A and 16B shown in FIG. 2 are arranged with their polarization axes intersecting, and a black display is made in a dark state, and a white display is made in a bright state.

Although the matrix electrode shown in FIG. 1 is driven by the driving example described below, the present invention can also be applied to a matrix electrode formed by a scanning electrode and an information electrode having the same electrode width.

FIG. 4 is a diagram of the liquid crystal display drive control circuit of this embodiment.

In the figure, DSP is a liquid crystal display unit (AII).
+ A I□, . . . , A44 indicate each pixel. Ml.

M2. M3 is a frame memory, each having a memory capacity of 4×4=16 bits. Memories Ml, M2. Data is sent to M3 from data bus DB, and write/read and address are controlled by control bus CB.

FC is a field switching signal, DC is its decoder, and M
PX is memory Ml, M2 . A multiplexer that selects one of the outputs of M3, MM is a monostable multi-by-break, GT is a gate signal, FG is a clock oscillator, CK is a clock signal, AND is an AND gate, F is a row scanning clock signal, CNT is a counter, SR is a serial input parallel input shift register, DRI~DR4 are column drive circuits, DR5~
DR8 is a row drive circuit.

The operation of the circuit shown in FIG. 4 will be explained below with reference to FIGS. 5 to 7.

FIG. 5 shows the gradation data of each pixel in one gradation screen scan (period for forming one screen of gradation video image; referred to as "-frame"), and the most significant bit MSB of each gradation data is stored in memory M3. , the middle bit is input to the memory lJM2, and the least significant bit LSB is input to the memory M1 via the data bus.

Then, when a single screen scan (referred to as "-subframe") switching signal FC is generated at time t1, the decoder DC sets the multiplexer MPX to select data from the memory M1. At the same time, FC is a monostable multivibrator MM
is input into the AND gate AN and generates a gate signal GT.
D is opened and four clocks of the clock signal CK are outputted as the row scanning signal F to the counter CNT. counter CNT
turns on the driver DR5 with the first clock.

At this time, the data of the first row of the memory Ml is input to the shift register SR, and only the driver DR4 is in the on state. Therefore, only the liquid crystal pixel A +3 is set to the dark level, and the other liquid crystal pixels AII + Al1 +
AI4 is set to the bright level. The row scanning signal F is then input to a controller (not shown) as a memory row switching signal, the next second row data from the memory Ml is input to the shift register SR, and the next row scanning signal F turns on the driver DR6. , simultaneously shift registers SR to M
The data of the second digit of l is respectively input to the driver DRINDR4. At this time, the drivers DR2, DR3, and DR4 are turned on, and the pixels A22 r A23 r A24 are set to the dark level, and the pixels A21 are set to the bright level. 3rd line.

The above operation is repeated for the fourth row as well.

The fourth row scanning signal F that selects the fourth row is sent to the counter CN.
When input to M2, the counter CNT outputs a memory switching request signal MC to a controller (not shown), and the memory switches to M2.
and moves to the second subframe. At this time, the first
Each liquid crystal pixel set to a bright or dark state in a subframe maintains that state because the ferroelectric liquid crystal has a memory function.

Similarly, in the second subframe, the multiplexer MPX selects data from the memory M2 in accordance with the subframe switching signal FC, and the row scanning signal is transferred to the counter C in accordance with the gate signal GT.
It is input to NT and shift register SR. and the first
Row scanning is performed at the same period as the subframe, and each liquid crystal pixel is set to a dark state or a bright state. The same applies to the third subframe.

In this embodiment, the first. Second. The ratio of the third sub-frame period is set to be the same as the weighting of each bit (1:2:4. Therefore, for example, the gradation data of pixel A 11 is
As shown in the figure (2, in this case, only the second sub-frame period is at a dark level, and 2/7 of the -frame period is in a dark state.Also, the gradation data of pixel A24 is 5, but , in this case, the first and third sub-frame periods are at the dark level, the second sub-frame period is maintained at the bright level, and -5/7 of the frame period is in the dark state.
The gradation data of 42 is 7, and at this time, the dark state is maintained during all subframe periods. In other words, in this embodiment, it is possible to express eight gray levels.

By controlling the display time ratio within one frame, that is, the display duty, in this manner, it becomes possible to express an apparent halftone. When the third subframe ends and the -frame ends, the data in the memories M1 to M3 are rewritten by the control bus CB and data bus DB, and the data of the next frame is stored in the memory.

Although one frame is divided into three subframes in this embodiment, it is possible to display halftones by dividing the frame into two or more subframes. Furthermore, although each subframe period is determined by the amount of scaling with the same weighting as the data bits, it is also possible to make the amount of scaling equal by dividing it equally. However, in this case, it is necessary to decode the gradation data.

FIG. 8(A) shows the scan selection signal Ss, scan non-selection signal SN, white information signal IW and black information signal °IB used in the present invention.
It represents. FIG. 8(B) shows the voltage ( The voltage waveform applied to the non-selected pixels (to which the voltage (IB ss) is applied at the pixel to which the black information signal ■8 is applied) on the same scan selection electrode. The voltage waveform applied to two types of pixels on the scan non-selection electrode and the scan non-selection signal applied to the scan non-selection signal are shown. According to FIGS. 8(A) and 8(B), at phase t, a voltage -(V
I+V3) is applied to create one orientation state of the ferroelectric liquid crystal, thereby creating a dark state and writing black. Phase 1 at this time. Then, the selected pixel on the scan selection electrode is supplied with a voltage (V
I+V3) is applied, causing no change in the alignment state of the ferroelectric liquid crystal. At phase t2, a voltage (v 2 +V 3 ) exceeding the threshold voltage of the other ferroelectric liquid crystal is applied to the selected pixel on the scan selection electrode, so that the ferroelectric liquid crystal changes to the other alignment state. A bright state is produced by orienting the light to white, which is written in white. Further, at phase t2, a voltage (V2 V3) which is a voltage below the threshold of the ferroelectric liquid crystal is applied to non-selected pixels on the scan selection electrode, so that the alignment state at the previous phase t1 is not changed. On the other hand, a voltage ±v3, which is a voltage below the threshold voltage of the ferroelectric liquid crystal, is applied to the pixels on the scanning non-selected electrode at phases t and t2. Therefore, in this example, even if white or black writing is performed on the pixel on the scanning electrode selected in phase T, and the scanning non-selection signal is subsequently applied, the previous writing The write state of will be maintained as is.

Further, in this example, at phase T2, a voltage of opposite polarity to the information signal at write phase T is applied from the information electrode. Therefore, as shown in FIG. 8C, an AC voltage is applied to the pixels when scanning is not selected, and the threshold characteristics of the ferroelectric liquid crystal can be improved.

FIG. 8(C) shows a timing chart of drive voltages in the subframe shown in FIG. In this example, the scan selection signal is applied to every five scan electrodes in an intermittent manner, and the scan selection signal is applied to non-adjacent scan electrodes in six consecutive fields. In this example, by selecting every five scanning electrodes and performing -subframe scanning (single screen scanning) in six field scans, the scanning selection period (TI+72) is set to be long at low temperatures, and as a result, Low frame frequency scanning drive (e.g. 5~10H)
z frame frequency), it is possible to significantly suppress the occurrence of flicker caused by scan drive at a low frame frequency, and furthermore, it is possible to select scan electrodes that are not adjacent to each other in six consecutive field scans. Image deletion could be effectively eliminated by applying a scan selection signal to.

FIG. 8(D) shows an example of the drive waveform at the intersection of the scanning electrode S1 and the information electrodes (1) and (2) in the - frame and the first to third subframes.

According to FIG. 8(D), each subframe period is divided into 2 subframes: 1st subframe; 2nd subframe: 3rd subframe =
:4, and at the intersection of scanning electrode S1 and information electrode ■1, bright in the first subframe, bright in the second subframe,
A disparaging display corresponding to the dark state is obtained in the third sub-frame, and at the intersection of the scanning electrode Sl and the information electrode ■2, the first sub-frame is bright, the second sub-frame is dark, and the third sub-frame is bright. A gradation display corresponding to the dark state can be obtained. However,
In this example, as shown in FIG. 3, the intersection area between the scan electrode S and the information electrode I2 is set to twice the intersection area between the scan electrode S and the information electrode 11, and this intersection area ratio is The gradation is displayed according to the gradation.

FIG. 4(E) is an example using the drive waveform of FIG. 4(A). A scan selection signal was applied to select non-adjacent scan electrodes in one field scan.

The present invention is not limited to the above-mentioned example (in particular, a scan selection signal can be applied to the scan electrodes every 4 or more, preferably every 5 to 20 scan electrodes). Then, the peak values of the voltage signals V, , -V and ±v3 are expressed as l
V, l = l V21 > l ±V3, preferably lV+ l=l V2 l>21±v31. Further, the pulse width of these voltage signals is generally lμsec to 1m5ec, preferably 10μsec
-100 μsec, and it is better to set the pulse width at low temperature to be longer than the pulse width at high temperature.

In the present invention, various types of ferroelectric liquid crystal elements can be used. Specifically, 5SFLC disclosed by Clark et al. in U.S. Patent No. 4,367,924, etc.
and Isogai et al. in U.S. Pat. No. 4,586,791, or the ferroelectric liquid crystal in an aligned state as disclosed in British Publication No. 215'9635. element can be used. In addition, in the present invention, by arranging color filters in each pixel in, for example, a stripe shape or a mosaic shape to create a bistable liquid crystal element, and driving the second element by the above-described driving method, gradation can be improved. Can display color images.

Therefore, the method of the present invention is useful for LCD televisions displaying monochrome or color images with gradation, especially for conventional CR TVs.
It can be applied to liquid crystal pocket color televisions which are much smaller and lighter than T-color televisions.

〔Effect of the invention〕

According to the present invention, it is possible to effectively suppress the occurrence of flicker caused by scanning drive at a low frame frequency such as 2 Hz to 15 Hz, and even during a long scan selection period at a low temperature. A high-quality display gradation screen can be obtained over a substantially wide temperature range without flickering. Furthermore, according to the present invention, image distortion can be effectively prevented, and in this sense, a high-quality gradation display screen can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a matrix electrode used in the present invention. Figure 2 shows the A-
A' is a sectional view. FIG. 3 is an explanatory diagram schematically showing halftones. FIG. 4 is an explanatory diagram showing the drive control circuit of the present invention. FIG. 5 and FIGS. 6(a) to 6(d) are explanatory diagrams showing one example of pixel gradation data. FIG. 7 is an explanatory diagram showing a time chart when used in the driving method of the present invention. FIGS. 8(A) to 8(E) are waveform diagrams showing examples of drive waveforms used in the present invention. Ning 20 Ya 20 11z Sho 9 trouble (A) L old, wealthy, distorted, and other ryo S1 Touu'''r1 Suzuzo 2 Ya 9 Uichizo Soya Vl One end - I - / 3 Zo 3 Poor I call f coffin t □ ：rab moxibustion V7 leap (, E3) t? "→

Claims (18)

[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. Single screen scanning by serially applying a scanning selection signal to non-adjacent scanning electrodes. A liquid crystal display comprising: a driving means having a first means for scanning one gradation screen by scanning one screen a plurality of times; and a second means for applying an information signal to the information electrode in synchronization with a scan selection signal. Device. (2) 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. (3) 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 to the scanning electrode within one vertical scanning period. In synchronization with the scan selection signal, an information signal is applied to the first means and the information electrode, which perform one screen scan by one vertical scan a plurality of times, and one gradation screen scan by a plurality of one screen scans. A liquid crystal device having a driving means having a second means for applying. (4) The liquid crystal device according to claim 3, 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. (5) The liquid crystal device according to claim 3, wherein the first 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. (6) The liquid crystal device according to claim 3, wherein the first 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. (7) The first means interlacely applies a scan selection signal to the scan electrode every N (N=an integer of 2, 3, 4, etc.) within one vertical scanning period, and (N+1 3. The liquid crystal device according to claim 3, further comprising means for performing one screen scan in one vertical scan of ) times. (8) 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 to the scanning electrode within one vertical scanning period. One screen scan is performed by applying the scan selection signal to non-adjacent scan electrodes in at least two consecutive one vertical scans, and the first floor is A liquid crystal device comprising a drive means having a first means for scanning a test screen and a second means for applying an information signal to the information electrode in synchronization with a scan selection signal. (9) The liquid crystal device according to claim (8), 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. (10)a, a matrix electrode having a scanning electrode and an information electrode, in which a plurality of electrodes constituting at least one of the scanning electrode and the information electrode are wired with at least two different electrode widths, and a ferroelectric a liquid crystal element having a magnetic liquid crystal; and b, one screen scan is performed by serially applying a scan selection signal to non-adjacent scan electrodes, and a first gradation screen scan is performed by performing one screen scan a plurality of times. A liquid crystal device comprising a drive means having a second means for applying an information signal to the means and the information electrode in synchronization with a scanning selection signal. (11) The liquid crystal device according to claim (10), 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. (12)a, a matrix electrode having a scanning electrode and an information electrode, in which a plurality of electrodes forming at least one of the scanning electrode and the information electrode are wired with at least two different electrode widths; A scanning selection signal is applied to the liquid crystal element having a magnetic liquid crystal, and (b) to the scanning electrode in an interlaced manner every two or more lines within one vertical scanning period, one screen is scanned by one vertical scanning multiple times, and one screen is scanned multiple times. A liquid crystal device comprising: a first means for scanning one gradation screen by one screen scan; and a driving means having a second means for applying an information signal to an information electrode in synchronization with a scan selection signal. (13) The liquid crystal device according to claim 12, 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) The liquid crystal device according to claim 12, wherein the first means includes means for applying a scan selection signal to the scan electrodes in an interlaced manner at every fourth or more scan electrodes within one vertical scanning period. (15) The liquid crystal device according to claim 12, wherein the first 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. (16) The first means interlacely applies a scan selection signal to the scan electrode every N (N=an integer of 2, 3, 4, etc.) within one vertical scanning period, and (N+1 13. The liquid crystal device according to claim 12, further comprising means for performing one screen scan in one vertical scan of ) times. (17) a. A matrix electrode having a scanning electrode and an information electrode, in which a plurality of electrodes constituting at least one of the scanning electrode and the information electrode are wired with at least two different electrode widths, and ferroelectricity. Two scan selection signals are applied to the liquid crystal element having the liquid crystal, and the scan electrode b within one vertical scan period.
Interlaced application is applied every other time or more, one screen scan is performed in such a way that the scan selection signal is applied to non-adjacent scan electrodes in at least two consecutive one vertical scans, and one vertical scan is performed multiple times. A liquid crystal device comprising a driving means having a first means for scanning one gradation screen by one screen scan and a second means for applying an information signal to an information electrode in synchronization with a scan selection signal. (18) The liquid crystal device according to claim (17), 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.