JPH07281167A - Liquid crystal element and information transfer device provided with the same - Google Patents

Abstract

PURPOSE:To prevent the generation of the gap part to keep display quality excellent and to prevent the change of a cell thickness at the time of driving to simplify driving control by suppressing the movement of a liquid crystal molecular. CONSTITUTION:In a liquid crystal display element, an inorganic shielding films 25a, 25b contain the fine particles 30,... of a metal oxide (metal oxide containing elements such as Si, Ti, Zr, Al, Ta, Pb) and projecting and recessed parts are formed by the fine particles 30,... on the surface of orientation control films 26a, 26b. Further, the surface of the orientation control film is rubbing treated. Then, the movement of the liquid crystal molecular 9 is prevented even in driving the liquid crystal element 20 by the projecting and recessed parts, the rubbing treating, the chemical action of the metal oxide.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device for displaying information using liquid crystal and a liquid crystal device such as a liquid crystal-optical shutter, and more specifically, a liquid crystal device for suppressing movement of liquid crystal molecules during driving. And an information transmission device provided with the liquid crystal element.

[0002]

2. Description of the Related Art Conventionally, various liquid crystal elements, particularly liquid crystal display elements using a ferroelectric liquid crystal, have been proposed in Japanese Patent Laid-Open No. 61-94023.

FIG. 1 shows an example thereof, and the liquid crystal display element 1 includes two glass substrates 2a and 2b. Transparent electrodes 3a and 3b are formed on the glass substrates 2a and 2b, respectively, and the transparent electrodes 3a and 3b are covered with insulating films 5a and 5b. Further, these insulating films 5a and 5b are covered with the orientation control films 6a and 6b, and
Alignment treatment (rubbing treatment) is applied to a and 6b. Further, a large number of bead spacers 7, ... Are interposed between the substrates 2a and 2b on which the orientation control films 6a and 6b are formed in this way, and the cell gap is 1 to 3 μm.
Is set to. In addition, this substrate gap is the sealing material 12
(See FIG. 2A), and the ferroelectric liquid crystal 9 is injected into the gap. Further, polarizing plates 10a and 10b are arranged outside the glass substrates 2a and 2b.

The liquid crystal display element 1 using the ferroelectric liquid crystal 9 is characterized in that the ferroelectric liquid crystal 9 has spontaneous polarization, and thus the engaging force between the external electric field and the spontaneous polarization can be used for switching. The major axis direction of the dielectric liquid crystal molecules and the polarization direction of the spontaneous polarization have a one-to-one correspondence with each other, so that the switching can be performed depending on the polarity of the external electric field.

Ferroelectric liquid crystals are generally chiral
Since smectic liquid crystals (SmC ^* , SmH ^* ) are used, the long axis of the ferroelectric liquid crystal molecules exhibits twisted alignment in the bulk state. However, by adjusting the cell gap to 1 to 3 μm as described above, The twist of the long axis of the ferroelectric liquid crystal molecule can be eliminated (P213-P234).
N. A. CLARK et al, MCLC 198
3, Vol 94).

[0006]

In the liquid crystal display element 1 described above, it is known that the ferroelectric liquid crystal molecules move to some extent even by a non-selection signal during matrix driving. This is also clear from the fact that when the optical response of the pixel to which the non-selection signal is applied is taken, the light amount varies in synchronization with the applied bulk. Such molecule fluctuations only cause a slight decrease in contrast in the so-called splay orientation (orientation in which the angle of the long axis of the molecule is greatly twisted between the upper and lower substrates), and the fluctuation of the molecule causes a stable position of the molecule. If there is no change (switching), the display content is retained and there was no particular problem.

However, in the so-called uniform orientation (orientation in which the change in the angle of the molecular long axis direction between the upper and lower substrates is relatively small), a voltage (for example, a non-selection signal) is applied to the layers of the ferroelectric liquid crystal molecules. The amount of movement becomes remarkable, and there are the following problems in the durability of the liquid crystal display device.

Now, as shown in FIGS. 2 (a) and 2 (b), a ferroelectric liquid crystal 9 is sealed by a seal member 12 to manufacture a liquid crystal display element. A polyimide thin film is used as the orientation control film, and the rubbing direction is from the bottom to the top of the upper and lower substrates as indicated by the arrow in the figure. When such treatment is performed, the smectic layer is generated in the direction orthogonal to the rubbing direction as shown in FIG. 2 (c). In addition, when the cell gap is made thin enough to release the helical pitch, the ferroelectric liquid crystal molecules can be in two stable states, but the orientation of all the molecules in the cell is aligned with one of them. Keep it. When this state is a + θ state (see FIG. 2 (d)), another stable state exists at a −θ position which is almost symmetrical with respect to the layer normal.

When an electric field (for example, a rectangular wave of 10 Hz and ± 8 V) is applied to the entire surface of the cell in this state (+ θ), the ferroelectric liquid crystal molecules are kept in the inclination with respect to the layer normal of + θ as shown in FIG. a) Start moving from point A to point B in the center.
When this voltage application is continued for a longer period of time, as shown in FIG. 2 (b), a liquid crystal-free portion E (hereinafter referred to as a void portion E) is generated at the A end, and the cell thickness of the B portion is larger. It becomes thicker than part A. In the case of the state of −θ, the movement direction is opposite (that is, the direction from the B end to the A end), and as a result, the void portion E is generated not at the A end but at the B end.

Such a phenomenon may occur in a relatively short time of 20 hours to 50 hours, and such a void portion E cannot be controlled electro-optically, which is not preferable for display quality. Since the cell thicknesses of the parts A and B change with time, it is difficult to control the driving of the entire liquid crystal display element, which has been a serious problem as an optical element using a ferroelectric liquid crystal.

Therefore, according to the present invention, by suppressing the movement of the liquid crystal molecules, the generation of voids is prevented and the display quality is kept good, and the change of the cell thickness during driving is prevented to simplify the drive control. It is an object of the present invention to provide a liquid crystal device having the above-described structure and an information transmission device including the liquid crystal device.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and covers two substrates on which electrodes are formed and which are arranged to face each other, and these electrodes. The inorganic insulating film formed on each of the two substrates, the orientation control film formed on at least one of the inorganic insulating films on the two substrates, and sandwiched between the two substrates. Equipped with a chiral smectic liquid crystal,
In addition, in the liquid crystal element in which the fine particles are formed on the surface of the alignment control film by containing transparent fine particles in the inorganic insulating film, the inorganic insulating film is made of Si, Ti, Zr, T.
It is characterized by containing at least one kind of oxide of any metal of a, Al and Pb.

In this case, the average particle diameter of the fine particles is 100.
It is preferable that it is ~ 1000Å. Further, it is preferable that the content of the fine particles is 10 to 30% by weight. Further, the inorganic insulating film is made of Si, T
It may be formed of an oxide of two or more kinds of metals selected from i, Zr, Ta, Al and Pb.

On the other hand, the information transmitting apparatus according to the present invention includes a graphic controller for outputting a data signal and a scanning method signal, a scanning signal control circuit for outputting scanning line address data and a scanning method signal, display data and a scanning method signal. And an information signal control circuit for outputting the above, and the above-mentioned liquid crystal element.

[0015]

According to the above structure, the movement of liquid crystal molecules is suppressed even when the liquid crystal element according to the present invention is driven.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

First, the structure of the liquid crystal display element (liquid crystal element) 20 according to this embodiment will be described with reference to FIG. The same parts as those shown in FIGS. 1 and 2 are designated by the same reference numerals, and the duplicated description will be omitted.

In this embodiment, the transparent electrodes 3a and 3b are used.
Is formed of In ₂ O ₃ or ITO, and these transparent electrodes 3a and 3b are covered with inorganic insulating films 25a and 25b having a thickness of 50 to 1000 Å, respectively. The inorganic insulating films 25a and 25b are covered with orientation control films 26a and 26b having a thickness of 50 to 1000Å, and the orientation control films 26a and 26b are formed of fluorine-containing polyimide. Although the alignment control films 26a and 26b are subjected to rubbing treatment, the two alignment control films 26a and 26b are arranged such that the rubbing directions are parallel and in the same direction. Further, the ferroelectric chiral smectic liquid crystal 9 is sandwiched in the gap between the substrates 2a and 2b, but the bead spacers 7, ... Make the inter-substrate distance (correctly, the distance between the alignment control films 26a and 26b) 0. Since it is set in the range of 0.1 to 3 μm, the liquid crystal 9 is suppressed from forming a helical alignment structure and has a bistable orientation state.

By the way, in this embodiment, the inorganic insulating films 25a and 25b contain the transparent fine particles 30 to form irregularities on the surfaces of the orientation control films 26a and 26b. There is.

Next, the liquid crystal display element 20 according to the present embodiment.
Materials and the like will be described.

First, the fine particles 30, ... contained in the inorganic insulating films 25a, 25b are made of SiO ₂ , TiO ₂ , Zr.
It is desirable to use fine particles of inorganic oxides such as O ₂ and Al ₂ O ₃ . In addition, in the present embodiment, these fine particles may be used alone, a plurality of types of fine particles may be used in combination, and further, they may be used as a composite oxide. The average particle size of the fine particles 30, ... Is 100 to 1000.
Å, particularly 300 to 600Å is desirable. Further, it is desirable that the fine particles 30, ... Have a spherical shape or a shape close thereto. In addition, the inorganic insulating films 25a, 2
For the formation of 5b, a solution in which these fine particles 30, ... Are dispersed in a metal alkoxide-based material is used. The content of the fine particles 30, ... is preferably 10 to 30% by weight. As the system material, Si,
Metallic elements such as Ti, Zr, Al, Ta and Pb are preferable. Further, the metal alkoxide-based material may be an oligomer or a low molecular weight condensation product, or may contain these. Furthermore, the fine particles are
It is effective to use a sol dispersed in water or an organic solvent. A normal alkyl group is used as the organic residue used in the metal alkoxide material. By the way, the above-mentioned constituent metal elements of the transparent fine particles 30, ... And constituent metal elements of the metal alkoxide-based material are the inorganic insulating films 25a, 2a.
5b is set in any combination in order to obtain necessary characteristics (for example, film hardness, refractive index, dielectric constant).
Particularly, from the viewpoint of film quality, those containing at least Si element are preferable. Note that the film thickness of the inorganic insulating films 25a and 25b should be set in consideration of the relationship with the particle size of the fine particles 30, ..., In order to form unevenness on the surfaces of the orientation control films 26a and 26b. , The thickness of the inorganic insulating film 25a, 2
.. is preferably smaller than the particle size of the fine particles 30 ,.

On the other hand, various kinds of alignment control films 26a and 26b formed of fluorine-containing polyimide can be used, but they are synthesized by polycondensation reaction of fluorine-containing diamine and tetracarboxylic acid anhydride. The polyamic acid obtained is subjected to ring closure by heating.

As an example of the tetracarboxylic acid anhydride, aromatic compounds such as pyromellitic dianhydride, benzophenonetetracarboxylic acid dianhydride, biphenyltetracarboxylic acid dianhydride and naphthalenetetracarboxylic acid dianhydride can be used. Alicyclic tetracarboxylic dianhydrides such as tetracarboxylic dianhydride, cyclobutane tetracarboxylic dianhydride, and cyclopentane tetracarboxylic dianhydride can be used.

The diamine is represented by the following general formula (I)

[0025]

[Chemical 1] 2,2-bis [4- (aminophenoxy) phenyl] hexafluoropropane and the like can be used.

The fluorine-containing polyimide obtained by these can usually obtain a large pretilt angle (angle formed by the substrate and the liquid crystal molecule) with respect to the liquid crystal molecule, and display with high contrast in the ferroelectric liquid crystal is possible. Becomes

As the orientation control films 26a and 26b, in addition to the above-mentioned fluorine-containing polyimide, another ordinary polyimide may be compounded by blending or copolymerization.

Further, in the present invention, the inorganic insulating film 25
The alignment control film 26 is formed by the fine particles 30, ...
Concavities and convexities need to be formed on the surfaces of a and 26b, but if the film thickness of the orientation control films 26a and 26b is too thick, the concavities and convexities on the surfaces of the inorganic insulating films 25a and 25b will become irregular.
It will not be reflected in b. Therefore, it is necessary to reduce the film thickness, and specifically, it is determined within the range of 50 to 1000Å depending on the degree of unevenness of the surfaces of the inorganic insulating films 25a and 25b. Usually, it is effective to set the film thickness to be smaller than the value obtained by subtracting the film thickness of the inorganic insulating films 25a and 25b from the particle size of the fine particles 30.

The liquid crystal suitable for use in this embodiment is a liquid crystal that produces a chiral smectic C phase through an isotropic phase, a cholesteric phase, and a smectic A phase in the temperature lowering process. In particular, the pitch in the cholesteric phase is preferably 0.8 μm or more (however, the pitch in the cholesteric phase is measured at the center point in the temperature range of the cholesteric phase). As the specific liquid crystal substance, for example, a liquid crystal composition containing the liquid crystal substances “LC-1”, “80b” and “80SI ^* ” shown in Chemical Formula 2 below in the following ratios is preferably used.

[0030]

Embedded image LC-1 80B 80SI ^* Liquid crystal (1) (LC-1) ₉₀ / (80B) ₁₀ (2) (LC-1) ₈₀ / (80B) ₂₀ (3) (LC-1) ₇₀ / (80B) ₃₀ (4) (LC-1 ) ₆₀ / (80B) ₄₀ (5) 80SI ^{* The} above blending ratios represent weight ratios.

Next, the liquid crystal display element 20 according to the present embodiment.
The manufacturing method of will be described.

In this embodiment, the inorganic insulating film 25a,
In the production of 25b, inorganic oxide-based transparent fine particles 3
A solution obtained by uniformly dispersing 0, ... In a metal alkoxide-based material is used. Then, the solution is applied to the substrate 2a,
Spinner method, spray method, dipping method,
It is applied by a roll coater method, a transfer printing method, etc., and then dried, and further, the elimination of organic residues is promoted by irradiation with UV light of 1 J / cm ² or more, and finally 200 ° or more, preferably 300 °. Heat cure to a certain degree. In this way, the inorganic insulating films 25a and 25b are formed.

Further, in the present embodiment, when the polyimide alignment control films 26a and 26b are manufactured, the polyamic acid which is a precursor of polyimide is treated with dimethylformamide, dimethylacetamide, dimethylsulfoxide,
A solution prepared by dissolving 0.01 to 40% by weight in a solvent such as N-methylpyrrolidone is used. Then, the solution is applied onto the inorganic insulating films 25a and 25b by a spinner coating method,
It is applied by a spray coating method, a roll coating method or the like, and then 100 to 350 ° C, preferably 200 to 300 ° C.
The dehydration ring is closed by heating at the temperature. The orientation control films 26a and 26b thus formed are rubbed with a cloth or the like.

Next, the operation when the liquid crystal display element 20 is driven will be described.

Even if the liquid crystal display element 20 is driven based on the above-described structure, the alignment control films 26a and 26b have uneven surfaces and are rubbed, so that the liquid crystal 9 moves. Is regulated.

Next, the effect of this embodiment will be described.

According to this embodiment, the orientation control films 26a, 2a
Unevenness formed on the surface of 6b, rubbing treatment applied to the surface, and metal oxides (Si, Ti, Zr, Al, Ta, Pb) contained in the inorganic insulating films 25a and 25b.
The movement of liquid crystal molecules is regulated by the chemical action of (a metal oxide containing such elements). Therefore, the voids as described in the above-mentioned conventional example do not occur, and the display quality does not deteriorate. Further, the cell thickness at the end of the liquid crystal display element hardly changes, and the drive control is not complicated.

On the other hand, when the content of the fine particles 30, ... Is less than 10% by weight, the effect of suppressing the liquid crystal movement phenomenon is poor, and when it is more than 30% by weight, the alignment control film 26 is obtained.
Although the degree of unevenness formed on a and 26b becomes large and affects the uniform alignment of the liquid crystal, there is no such problem because the content is 10 to 30% by weight in the present embodiment.

Further, in this embodiment, the inorganic insulating film 25 is used.
The thickness of a and 25b is in the range of 50 to 1000Å, and
Since the particle size is smaller than the particle size of the fine particles 30, ..., The uneven shape can be effectively formed on the surfaces of the orientation control films 26a and 26b. Therefore, the movement of the liquid crystal molecules can be appropriately suppressed as described above, and the inorganic insulating film 25a,
25b and the alignment control films 26a and 26b have good adhesion,
It can also contribute to the reduction of quality defects.

Further, in this embodiment, an insulating film having necessary characteristics can be formed by properly combining the transparent fine particles and the constituent metal elements of the metal alkoxide-based material. That is, an insulating film having a high film hardness can be obtained, an insulating film having an appropriate refractive index can be obtained, and an insulating film having an arbitrary dielectric constant can be obtained. Further, it is possible to prevent the deterioration of the display characteristics due to the signal delay due to the high dielectric constant, have a sufficient withstand voltage, and prevent a short circuit or the like. In order to improve the quality of the insulating film,
It is desirable to contain Si element.

The present inventor conducted the following experiment in order to confirm the effect of this example (the effect of suppressing the movement of liquid crystal molecules). <Experiment 1> In the liquid crystal display element used in this experiment, the transparent electrodes 3a and 3b are made of ITO having a thickness of 1000 L, and the glass substrates 2a and 2b have a thickness of 1.1 mm. Further, as a solution for forming the inorganic insulating films 25a and 25b, SiO ₂ fine particles having an average particle diameter of 450Å are used as the ceramicate “RTZ-
6 (catalyst chemical conversion product, Ti, Si, Zr system) "20% by weight
The coating liquid dispersion-stabilized was used. Then, when manufacturing the inorganic insulating films 25a and 25b, this solution is applied onto the substrates 2a and 2b by a transfer printing method,
After that, UV light of about 6 J / cm ² was irradiated by a high pressure mercury lamp, and heating and baking was further performed at 300 ° C. for 1 hour.
In addition, the inorganic insulating films 25a and 2 thus formed
The thickness of 5b was 160Å. On the other hand, the orientation control film 26
Fluorine-containing polyimide-based alignment films having a thickness of about 250 Å are used for a and 26b, and the alignment control films 26a and 26b are
One-way rubbing treatment was performed with a nylon breeding blanket.
Further, the bead spacers 7, ... Have an average particle size of about 1.5.
μm silica beads were used. Further, a ferroelectric liquid crystal having the following characteristics was vacuum-injected under an isotropic phase and gradually cooled to room temperature.

Temp 30 ° C. Ps 5.8 nC / cm ² θ Tilt Angle 14.3 ° Δε ˜0

[0043]

[Chemical Formula 3] 82.3 ° C 76.6 ° C 54.8 ° C -20.9 ° C → → → → Iso Ch SmA SmC ^* Cryst ← ← ← ← 81.8 ° C 77.3 ° C 55.1 ° C -2.5 ° C Further, the liquid crystal display device having the above-described configuration was manufactured and ± 8V. 10,
A rectangular wave of Hz was applied at room temperature for 23 hours, and the cell thickness change was measured at two points A and B separated in the layer direction as shown in FIG. 2 (a).

According to this experiment, the change in cell thickness at both points A and B was 2% or less, and it was confirmed that the movement of liquid crystal molecules was suppressed. Further, when the display quality was confirmed by sandwiching the liquid crystal display element between a pair of crossed Nicol deflecting plates, display unevenness and the like at the edges were not confirmed, and it was found that the liquid crystal display element had excellent display quality. <Experiment 2> Ceramate “RTZ-6” was added to the solution of the inorganic insulating film.
A liquid crystal display device was produced in the same manner as in Experiment 1 except that "(Catalyst Kasei)" was used.

In this case, the change in cell thickness is about 8%,
Display unevenness was confirmed at the end during driving. <Experiment 3> As fine particles, SiO ₂ having an average particle size of 80Å
A liquid crystal display element was produced in the same manner as in Experiment 1 except that was used.

In this case, the change in cell thickness is about 8%,
Display unevenness was confirmed at the end during driving. <Experiment 4> Si having an average particle size of 1500Å as fine particles
A liquid crystal display device was produced in the same manner as in Experiment 1 except that O ₂ was used.

In this case, large unevenness is formed on the surfaces of the alignment control films 26a and 26b, which adversely affects the alignment itself of the liquid crystal and the display quality is poor. <Experiment 5> A liquid crystal display device was produced in the same manner as in Experiment 1 except that the content of fine particles (SiO ₂ fine particles having an average particle diameter of 450Å) was 5% by weight.

In this case, the change in cell thickness is about 7%,
Display unevenness was confirmed at the end during driving. <Experiment 6> A liquid crystal display device was produced in the same manner as in Experiment 1 except that the content of fine particles (SiO ₂ fine particles having an average particle diameter of 450Å) was 35% by weight.

In this case, large unevenness is formed on the surfaces of the alignment control films 26a and 26b, which adversely affects the alignment itself of the liquid crystal and the display quality is poor. <Experiment 7> As a solution for forming the inorganic insulating films 25a and 25b, SiO ₂ fine particles having an average particle diameter of 600 Å were used as an inorganic coating agent "AT-7 (Nissan Chemical Co., Ltd.
A liquid crystal display device was produced in the same manner as in Experiment 1 except that the coating liquid in which 15% by weight of the dispersion liquid was stabilized in “i, Al system)” was used.

In this case, the change in cell thickness was 3% or less, and no display unevenness or the like was observed at the end even during driving. <Experiment 8> As a solution for forming the inorganic insulating films 25a and 25b, TiO ₂ fine particles having an average particle diameter of 1000 Å were used as a PZT-based ferroelectric thin film forming agent "PZT (Mitsubishi Materials, Pb, Zr, Ti-based). A liquid crystal display device was produced in the same manner as in Experiment 1 except that the coating liquid in which the dispersion stabilization of 10% by weight was used.

In this case, the change in cell thickness was 3% or less, and no display unevenness or the like was observed at the end even during driving. <Experiment 9> As a solution for forming the inorganic insulating films 25a and 25b, Al ₂ O ₃ fine particles having an average particle diameter of 300Å are dispersed in Atron "NTa-750 (manufactured by Nippon Soda, Ta system)" by 30% by weight. A liquid crystal display device was produced in the same manner as in Experiment 1 except that the stabilized coating liquid was used and the thicknesses of the orientation control films 26a and 26b were set to 100 Å.

In this case, the change in cell thickness was 4% or less, and no display unevenness or the like was observed at the end even during driving. As a solution for forming <Experiment 10> inorganic insulating film 25a, a 25b, average particle diameter of SiO ₂ particles of 800 Å "OCD (made by Tokyo Ohka Kogyo Co., Ltd., Si-based)" only 10 wt% dispersion stabilized allowed coating Experiment 1 except that the liquid was used
A liquid crystal display device was produced in the same manner as in.

In this case, the change in cell thickness was 4% or less, and no display unevenness or the like was observed at the end even during driving. <Experiment 11> As a solution for forming the inorganic insulating films 25a and 25b, ZrO ₂ fine particles having an average particle diameter of 100 Å were added to "MOF Ti-Si Film" (manufactured by Tokyo Ohka, Ti,
Si-based) ", a coating liquid dispersed and stabilized by 30% by weight was used, and the procedure was the same as in Experiment 1 except that the thicknesses of the inorganic insulating films 25a and 25b and the orientation control films 26a and 26b were both set to 50 Å. A liquid crystal display device was produced by

In this case, the change in cell thickness was 3% or less, and no display unevenness or the like was observed at the end even during driving.

Finally, peripheral devices of the liquid crystal display element 20 will be briefly described with reference to FIG.

A scanning signal application circuit 402 and an information signal application circuit 403 are connected to the liquid crystal display element 20 according to this embodiment, and the scanning signal control circuit 404 and the information signal control circuit are connected to these circuits 402 and 403. The 406, the drive control circuit 405, and the graphic controller 407 are connected in order. Then, the data and the scanning method signal are transmitted from the graphic controller 407 to the scanning signal control circuit 404 and the information signal control circuit 406 via the drive control circuit 405. The data among these is converted into address data and display data by these circuits 404 and 406, and the other scanning method signal is sent to the scanning signal applying circuit 402 and the information signal applying circuit 403 as it is. ing.
Further, the scanning signal application circuit 402 applies a scanning signal having a waveform determined by the scanning method signal to the transparent electrode (scanning electrode) determined by the address data, and the information signal application circuit 403 outputs the white or black signal transmitted by the display data. The configuration is such that an information signal having a waveform determined by two of the display content and the scanning method signal is applied.

[0057]

As described above, according to the present invention,
Since the unevenness is formed on the surface of the orientation control film and the inorganic insulating film contains an oxide of any metal of Si, Ti, Zr, Ta, Al and Pb, the movement of liquid crystal molecules is suppressed. it can. Further, by setting the average particle size of the fine particles contained in the inorganic insulating film in the range of 100 to 1000Å, it is possible to form appropriate irregularities on the surface of the alignment control film and effectively suppress the movement of liquid crystal molecules. Further, by setting the content of the fine particles in the range of 10 to 30% by weight, proper unevenness can be formed on the surface of the alignment control film, and the movement of liquid crystal molecules can be effectively suppressed. As described above, since the movement of the liquid crystal molecules is suppressed, it is possible to prevent the generation of the cell layer increasing portion and the void portion when the liquid crystal display element is driven, and to maintain the good display quality. Further, it is possible to prevent the cell thickness from changing during the driving and simplify the driving control.

By applying such a liquid crystal display element to an information transmitting device, it is possible to obtain an information transmitting device having excellent information display quality and easy drive control.

[Brief description of drawings]

FIG. 1 is a sectional view showing the structure of a conventional ferroelectric liquid crystal display element.

FIG. 2 is a diagram for explaining a conventional problem, (a)
Is a diagram showing a cell state before voltage application, (b) is a cell state after voltage application, (c) is a schematic diagram showing a smectic layer generation direction, and (d) is a detailed view of (c).

FIG. 3 is a sectional view showing the structure of a ferroelectric liquid crystal display device according to the present invention.

FIG. 4 is a block diagram illustrating peripheral devices of a liquid crystal display element.

[Explanation of symbols]

 1 liquid crystal display element (liquid crystal element) 2a, 2b glass substrate (substrate) 3a, 3b transparent electrode (electrode) 9 ferroelectric chiral smectic liquid crystal 20 liquid crystal display element (liquid crystal element) 26a, 26b alignment control film 25a, 25b inorganic insulation Film 30, Particles 404 Scanning signal control circuit 406 Information signal control circuit 407 Graphic controller

Claims (5)

[Claims] 1. A pair of substrates on which electrodes are formed and arranged so as to face each other, an inorganic insulating film formed on each of the two substrates so as to cover these electrodes, and An alignment control film formed on at least one inorganic insulating film on two substrates, and a chiral smectic liquid crystal sandwiched between the two substrates, and transparent in the inorganic insulating film. In a liquid crystal element in which fine particles are included to form irregularities on the surface of the alignment control film, the inorganic insulating film is Si, Ti, Zr, Ta, Al, P.
A liquid crystal element comprising at least one kind of oxide of any metal of b. 2. The average particle size of the fine particles is 100 to 100.
It is 0Å, The liquid crystal element of Claim 1 characterized by the above-mentioned. 3. The content of the fine particles is 10 to 30% by weight.
The liquid crystal element according to claim 1 or 2, wherein 4. The inorganic insulating film comprises Si, Ti, Zr,
The liquid crystal element according to claim 1, wherein the liquid crystal element is formed of an oxide of two or more kinds of metals selected from Ta, Al, and Pb. 5. A graphic controller that outputs a data signal and a scanning method signal, a scanning signal control circuit that outputs scanning line address data and a scanning method signal, and an information signal control circuit that outputs display data and a scanning method signal. An information transmission device comprising: the liquid crystal element according to claim 1.