JPH0651351A - Electric field double refraction control type liquid crystal element and its production - Google Patents

Abstract

PURPOSE:To provide the ECB (electric field double refraction control type) element with which the liquid crystal element can be spuriously made into a solid state by providing an orientation method for attaining the orientation of a uniform and low tilt angle and sealing liquid crystal molecules into a high polymer and which can form a display to a larger area and the method for producing said ECB element. CONSTITUTION:This liquid crystal element includes a polymer 12 to be sealed between two sheets of electrodes 15, at least one of which are transparent and which have polarizing plates 10, and the liquid crystal molecules 14 which are dispersed into the polymer 12 in at least either of a continuous and discontinuous forms and are impressed with electric fields of the frequencies to make dielectric anisotropy negative from electrodes 15. The liquid crystal molecules 14 are oriented in the molecule axes of the liquid crystals 14 from 0 to 70 deg. with respect to the vertical direction V of the cell.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric field birefringence control type liquid crystal device and a manufacturing method thereof. More specifically, ECB in which the color tone changes due to the change in birefringence that accompanies the change in liquid crystal orientation due to the electric field
(Electrically Controlled Birefringence) The present invention relates to a liquid crystal display device using a display mode and a manufacturing method thereof.

The electric field birefringence control type liquid crystal element is, for example, a flat display device such as a projection television, a personal computer, a word processor, a display plate whose color tone is changed by utilizing the shutter effect, a window, a door, a wall, and the like. It can be used for optical computing and the like. In particular, the present invention can be applied to a flat panel display device capable of color display for each individual picture element and requiring substantially three times the resolution without requiring a color filter.

[0003]

2. Description of the Related Art In general, an ECB, that is, a display mode for detecting a change in birefringence of a liquid crystal material due to an electric field under orthogonal Nicols has been actively studied.

This mode is capable of displaying color in one pixel without a color filter due to an apparent change in birefringence of the liquid crystal, and a TFT-color LC using TN or STN which is usually used.
Even with the same number of pixels, a resolution three times higher than that of D and Duty-color LCDs can be achieved.

This mode uses a liquid crystal material having a difference in permittivity ε between a direction parallel to the orientation vector and a direction perpendicular thereto, that is, a dielectric anisotropy Δε is negative (Δε <0). Generally, the alignment state when no voltage is applied is homeotropic alignment. When a voltage is applied, the liquid crystal material should have a slight pretilt in the vertical alignment film so as to prevent the liquid crystal material from tilting from homeotropic alignment to homogeneous alignment and causing color spots.

However, it is difficult for a normal vertical alignment film to have a uniform and uniform pre-tilt with good reproducibility. Therefore, a method in which a tilt angle is given by devising an electrode shape
(SID91 DIGEST page 758) and various other methods are disclosed. On the other hand, as a pseudo solidification of the liquid crystal material,
Polymer-dispersed liquid crystal display devices, which are characterized by dispersing a liquid crystal material in a polymer material, have been actively researched. A control method has been proposed.

According to this method, the orientation of the liquid crystal is basically aligned with the direction of the electric field when a voltage is applied, and the ordinary state refractive index of the liquid crystal molecules and the refractive index of the support medium are matched to display a transparent state. This is a display mode utilizing the light scattering state due to the disorder of the alignment of liquid crystal molecules, and is disclosed in Japanese Patent Publication No. 3-52843.

However, in these devices, it is difficult to arbitrarily align the liquid crystal molecules in the liquid crystal droplets,
As a technique for aligning liquid crystals in a polymer-dispersed liquid crystal display device, a substrate on which an alignment film is formed is used, and a polymer-dispersed liquid crystal display device is prepared in the substrate (Proceedings of the 17th Liquid Crystal Conference). Page), the liquid crystal and the polymer substance are phase-separated in a state where an electric field or a magnetic field is applied to the electrodes in the vertical or horizontal direction. If Δε> 0, the liquid crystal is likely to be homeotropically aligned with the electrode, and if Δε <0 is homogeneously aligned with the electrode) An environment is created in which the director is distorted by the polymer wall when the voltage is OFF. The liquid crystal molecule rearranges the director in the direction of the electric field when the voltage is turned on. A method of lowering the driving voltage is Liquid Crystal Vol. 5, No. 5, p1477-1489, 1989, JP-A-3-
210536 and the like, these alignment methods are
The former is not suitable for an ECB display device that requires a strict pretilt, and the latter is formed at the time of manufacturing because it uses the same polarity Δε when manufacturing and driving a polymer-dispersed liquid crystal display device. Since the alignment state of the liquid crystal and the alignment state in which the liquid crystal material is rearranged by applying an electric field are the same, there is a drawback that the change in the voltage ON-OFF of the cell prepared by this method is small.

In order to make up for these drawbacks, a reverse mode polymer dispersion type liquid crystal device using a liquid crystal for dual frequency driving has been reported on page 328 of the proceedings of the 17th liquid crystal conference, The liquid crystal molecules are homeotropically aligned by applying a low-frequency voltage such that ε> 0, and are driven by a high-frequency voltage so that Δε <0 during driving, thereby achieving homogeneous alignment. However, the liquid crystal molecules are oriented perpendicularly to the electrodes, a pretilt cannot be applied, and basically the scattering-transmission is controlled, which is basically different from the present invention.

Furthermore, the response speed when the voltage is turned on and off is increased,
For the purpose of increasing the above change, a display element using a liquid crystal material for dual frequency drive in which the sign of Δε changes depending on the frequency of the applied voltage has been developed (Mol. Crist. Liq. Crysr.
t., Vol.89, p77).

However, it is difficult to drive the cell at two frequencies such that the frequency f0 at which Δε of this liquid crystal material becomes 0 fluctuates greatly due to temperature change and Δε becomes positive or negative.

[0012]

In devices using general alignment technology and polymer-dispersed liquid crystal devices, the EC in the cell is
It has been difficult to achieve the uniform and low tilt angle alignment required for B-elements, which has hindered the commercialization of ECB elements.

When two frequency voltages of Δε> 0 and Δε <0 are used to change the alignment state of the dual frequency driving liquid crystal, the frequency at which Δε = 0 due to temperature change is It changes greatly and cannot be put to practical use.

In order to solve the above-mentioned problems, first of all, attention is focused on the technology of a polymer dispersion type liquid crystal element which makes it possible to make a liquid crystal pseudo solid, and in general, a liquid crystal droplet The liquid crystal molecules randomly aligned along the polymer wall were studied intensively so that the liquid crystal molecules would be in an alignment state suitable for the ECB device.

As a result, a desired alignment state can be achieved by carrying out a method for producing a polymer dispersed liquid crystal device such as polymerization of a prepolymer and removal of a solvent while applying a magnetic field and an electric field to a tilt angle to be aligned. Became clear.

However, ordinary liquid crystal materials (Δε> 0, magnetic permeability χ in a direction parallel to the orientation vector and a direction perpendicular to the orientation vector)
The magnetic permeability anisotropy Δχ, which is the difference, is positive, that is, Δχ> 0)
When these are used, these aligned states are almost the same as the direction in which the driving voltage applied between the electrodes is applied, so that the change of the liquid crystal molecules due to the voltage application after the cell structure is extremely small and it cannot be put to practical use.

An object of the present invention is to provide an alignment method for realizing uniform alignment with a low tilt angle, and to make a liquid crystal device pseudo solid by encapsulating liquid crystal molecules in a polymer. It is an object of the present invention to provide an ECB element capable of achieving the above and increasing the area of the display, and a method for producing the ECB element.

[0018]

According to a first aspect of the present invention, there is provided a polymer, at least one of which is transparent and which is sealed between two electrodes having a polarizing plate, and a continuous and non-continuous polymer in the polymer. Liquid crystal molecules that are dispersed in at least one of the above forms and that are applied with an electric field of a frequency at which the dielectric anisotropy becomes negative from the electrode, and the liquid crystal molecules have a molecular axis perpendicular to the cell. The second invention is characterized in that the liquid crystal material is oriented from 0 to 70 ° with respect to the direction, and a mixture of a liquid crystal material for dual frequency driving and a polymerizable monomer and an oligomer soluble in the liquid crystal material for dual frequency driving. Injecting between two electrodes, at least one of which is transparent, and varying the dielectric constant of the liquid crystal material at an angle of 0 to 70 ° with respect to the vertical direction of the electrodes when polymerizing the polymerizable monomer and the oligomer in the mixture. To be positive A third aspect of the present invention is characterized by including a step of applying an electric field and a magnetic field of a frequency to the cell and a step of attaching a polarizing plate to the cell. Injecting a mixture of a positive liquid crystal material and a polymerizable monomer and oligomer soluble with respect to the liquid crystal material between two electrodes, at least one of which is transparent, and polymerizing the polymerizable monomer and oligomer in the mixture. The present invention comprises a step of applying a magnetic field to the cell at an angle of 0 to 70 ° with respect to the vertical direction of the electrode, and a step of attaching a polarizing plate to the cell. And a step of forming two cells by combining two substrates each having a mixture of oligomers applied on a transparent electrode in a thin film through a spacer in a state where an unpolymerized material remains, and a liquid crystal material for driving two frequencies between the cells. After injecting A cell in which an electric field and a magnetic field having a frequency such that the dielectric anisotropy of the liquid crystal material is positive at an angle of 0 to 70 ° with respect to the vertical direction of the pole is applied to cure the polymerizable compound in the electric field and the magnetic field. And a step of combining two polarizing plates.

[0019]

According to the first aspect of the invention, the liquid crystal molecules are applied with an electric field having a frequency that makes the dielectric anisotropy negative, and the molecular axes of the liquid crystal molecules are oriented from 0 to 70 ° with respect to the vertical direction of the electrodes. The invention of 2 further comprises a liquid crystal material for dual-frequency driving and a liquid crystal material having negative dielectric anisotropy and positive magnetic permeability anisotropy. Two
When a mixture of a polymerizable monomer and an oligomer which is soluble with respect to the frequency driving liquid crystal material is injected between the electrodes and the polymerizable monomer and the oligomer are polymerized, 0 to 70 with respect to the vertical direction of the electrode between the electrodes. An electric field and a magnetic field having a frequency such that the dielectric anisotropy of the liquid crystal material is positive at an angle of ° are applied, and the fourth invention is such that the dielectric anisotropy is negative and the magnetic permeability anisotropy is positive. A mixture of a liquid crystal material and a polymerizable monomer and an oligomer soluble with respect to the liquid crystal material is injected between the two electrodes, and when polymerizing the polymerizable monomer and the oligomer, from 0 in the vertical direction of the electrode. A magnetic field is applied to the cell at an angle of 70 °, and the fifth invention is a polymerizable monomer.
And a substrate on which a mixture of oligomers is applied as a thin film on the electrode is combined with two via a spacer to form a cell, and a liquid crystal material for dual frequency driving is injected between the cells. After that, 0 to 70 in the vertical direction of the electrode
An electric field and a magnetic field having a frequency that makes the dielectric anisotropy of the liquid crystal material positive at an angle of ° are applied to combine the cell in which the polymerizable compound is cured in the electric field and the magnetic field with two polarizing plates. Therefore, the liquid crystal in the matrix of the polymer substance in the cell has a vertical orientation with a slight tilt angle uniformly in the cell plane, and an ECB element with little display unevenness can be produced in a large area with good reproducibility.

[0020]

EXAMPLES Specific examples of the present invention will be described below.

An important point of the present invention is that the liquid crystal for dual frequency drive or Δε <0, the magnetic permeability anisotropy Δχ is positive (Δχ> 0).
The purpose is to control the alignment state of the liquid crystal material suitable for ECB by an external electric field and magnetic field.

That is, when a polymer is phase-separated in the production of a polymer-dispersed liquid crystal device, or when a polymer wall of a liquid crystal or polymer composite that has already been formed is rearranged, an electrode (liquid crystal display cell) is used. ), Which is perpendicular to, and has a direction with a slight tilt angle, or a magnetic field is added during the droplet formation time.

By such an operation, the dielectric constant ε of the liquid crystal is set in the direction in which the liquid crystal is perpendicular to the electrodes and is slightly tilted.
Alternatively, the molecular axis of the polymer having a large magnetic permeability κ is oriented, and the polymer wall molecules that are polymerized or hardened in association with the liquid crystal are aligned in the most energy-stable manner with the liquid crystal aligned by the electric field or the magnetic field, and polymerized. Or even after curing
The alignment control force of the wall remains, and therefore, the molecular axes having large ε or κ of the liquid crystal are aligned in the direction perpendicular to the electrode (cell surface) and slightly tilted.

This tilt angle is an important factor that determines the black level of the ECB element, and is preferably 0 to 70 °, more preferably 0 to 5 °, and it is desirable that the angle is as close to vertical as possible to the electrode. . Particularly in the case of a polymer-dispersed ECB element, the direction of application of the external field may be 0 ° because the molecular axis is slightly bent by the polymer wall.

The strength of the electric field or magnetic field may be such that the liquid crystal molecules can be sufficiently oriented in the direction of the electric field or magnetic field. In the case of an electric field, the minimum peak value is 500 V / cm or more and the maximum peak value is
In the case of an electric field or magnetic field of 100 KV / cm or less, a magnetic field of 500 to 1,000,000 gauss is preferable.

When the electric field is ON, an electric field having a frequency of Δε <0 or a magnetic field horizontal to the cell is used to rearrange the liquid crystal by an external voltage or magnetic field. Many liquid crystal molecular axes are aligned. △ n ・ d changes from OFF state to ON state,
When the cell is observed between the crossed Nicols, the color tone changes continuously.

The liquid crystal material used in the embodiment of the present invention is a liquid crystal material for dual frequency driving and a liquid crystal material having Δε <0 and Δχ> 0. Specifically, as a liquid crystal material for dual frequency driving, Is NR-1012XX (manufactured by Chisso Petrochemical), etc.
ZLI-4788-000 and ZL as liquid crystal materials with 0 and Δχ> 0
I-4788-100 and ZLI-2806.

Further, among the biphenyl-based, ta-phenyl-based, phenylcyclohexane-based, diphenylcyclohexane-based, and tolan-based nematic liquid crystals containing F and CI in the chemically stable molecule in the liquid crystal material, liquid crystals with large Δn are Are suitable.

Furthermore, any combination of positive and negative signs of the dielectric anisotropy Δε and the refractive index anisotropy Δn of the liquid crystal material can be used according to the application.

The polymerizable monomers and oligomers used in the embodiments of the present invention may be photopolymerizable, radiation-polymerizable, thermopolymerizable monomers and oligomers, which are selected according to the liquid crystal material used. Affinity (± SP value of liquid crystal
2 or less).

Specifically, as the monomer, acrylic acid and a derivative of acrylic acid ester, more specifically, isobutyl acrylate, stearyl acrylate, lauryl acrylate, isoamyl acrylate, n-butyl methacrylate. , N-laurylmethacrylate, tridecylmethacrylate, n-stearylmethacrylate, cyclohexylmethacrylate, benzylmethacrylate,
2-ethylhexyl acrylate, 2-phenoxyethyl methacrylate, bisphenol A dimethacrylate, bisphenol A diacrylate, isobornyl methacrylate, isobornyl acrylate, and further To increase the physical strength of the polymer, a bifunctional or higher polyfunctional resin,
For example, 1,4-butanediol dimethacrylate, 1,6-
Hexanediol dimethacrylate, trimethylol propane trimethacrylate, trimethylol propane triacrylate, tetramethyl methane tetraacrylate, and urethane acrylate as an oligomer.
And polyoxyethylene acrylate can be used.

As the thermosetting monomer, an epoxy represented by glycidyl ethers such as ethylene glycol diglycidyl ether, trimethylolpropane triglycidyl ether, and 1.6-hexanediol diglycidyl ether. A resin and a urethane resin having an isocyanate group, such as xylylene diisocyanate, and a silicone resin having a double bond containing Si can be used.

Further, after carrying out the embodiment of the production method of the present invention, in order to exert the alignment effect of the liquid crystal more, at room temperature or near the processing temperature of the embodiment of the present invention, the liquid crystallinity (the molecule is subjected to an electric field or a magnetic field by an electric field or a magnetic field). Aligned in the direction)
It is further preferred to utilize radiation-polymerizable, heat-polymerizable monomers and oligomers.

By using these reactive liquid crystal compounds, the alignment when the electric field is OFF can be further strengthened after processing.

Specifically, methacrylic groups such as biphenyl group, ta-phenyl group, phenylcyclohexane group, diphenylcyclohexane group, and tolan skeleton are acrylylated.
It is a compound in which a polymerizable group such as epoxy group, methacrylate group, epoxy group, and siloxane group is bonded to the terminal of the molecule.

The polymer used in the method for removing the solvent from the mixture of the liquid crystal and the polymer soluble in the liquid crystal and the solvent may be any polymer which can be dissolved in a certain solvent. Is gum arabic, synthetic rubber, gelatin,
Examples thereof include polyvinyl alcohol, polystyrene, polymethylmethacrylate and polyvinyl acetate.

Further, it is more effective to use a liquid crystal polymer as a polymer after the embodiment of the production method of the present invention has been carried out, in order to exert a more orienting effect on the liquid crystal.

When preparing a polymer dispersed liquid crystal device using these compounds, it is necessary to suppress the light scattering intensity only in the polymer dispersed liquid crystal device excluding the polarizing plate.
It is important in B cells.

That is, when a light scatterer is placed between two crossed Nicols polarizers, one of the polarizers converts it into linearly polarized light, and the linearly polarized light hits the light scatterer to be converted into natural light, while the other one is converted into natural light. It partially passes through the polarizing plate and consequently deteriorates the black level of the cell.

Therefore, the cell thickness of the polymer-dispersed liquid crystal element used in the embodiment of the present invention is preferably 20 μm or less, and more preferably 1 to 12 μm in order to reduce the scattering intensity. .

Further, the shape of the liquid crystal droplets in the polymer dispersed liquid crystal element needs to be sufficiently longer or shorter than the wavelength of visible light in order to set the light scattering to be low. Liquid crystal droplets smaller than the wavelength of visible light are not practical because the driving voltage becomes high and the withstand voltage of the IC used in the driving circuit becomes high.

Therefore, the average diameter (long axis direction) of the liquid crystal droplets observed by SEM after extraction of the liquid crystal in the polymer dispersed liquid crystal element is 5 μm or more, and more preferably 12 μm.
m or more is preferable.

Therefore, the three-dimensional shape of the liquid crystal droplet is a "straw-shaped" shape. Furthermore, the light-scattering intensity of polymer-dispersed liquid crystal elements also changes depending on the mixing ratio of the liquid crystal and polymer material at the time of creation, and the liquid crystal material is 60-70%
In the region of, the scattering intensity becomes strong. Since the scattering intensity is weakened, if it is 60% or less, the liquid crystal fraction is small, and the driving voltage becomes high, so that it cannot be practically used.
~ 95%.

FIG. 1 is a cross-sectional view of the alignment state of the liquid crystal element of the electric field birefringence control type according to the present invention when the electric field is off, and FIG. 2 is a diagram for explaining the alignment of liquid crystal molecules of the liquid crystal element of FIG. FIG. 3 is a cross-sectional view showing a horizontal state of an alignment state when an electric field is turned on in a specific example of the electric field birefringence control type liquid crystal element of the present invention.

1-3, 10 is a polarizing plate, 11 is a substrate, 12 is a polymer, 13 is a liquid crystal material, 14 is a liquid crystal molecule, and 15 is a transparent electrode. The liquid crystal molecules 14 dispersed in the polymer 12 sealed between the transparent electrodes 15 are transparent electrodes 15
In contrast, the orientation is tilted by θ from the vertical direction V (FIG. 2).

FIG. 3 shows a change in orientation of liquid crystal molecules when an electric field having a frequency of Δε <0 is applied to the transparent electrode 15.

Examples of the present invention will be shown below, but the present invention is not limited thereto.

Example 1 Liquid crystal NR-1012xx (manufactured by Chisso Petrochemical Co., Ltd.) 4.3 g, TMPT (trimethylolpropane triacrylate ke Shin Shin Nakamura Chemical Co., Ltd.) 0.2 g, 2-ethylhexyl acrylate (manufactured by Nippon Kayaku Co., Ltd.) Add 0.5 g of the mixture to the UV curing agent Irgacure made by Ciba-Geigy.
Uniformly mix 184 0.05 g at 80 ° C.

Two glass with ITO (a mixture of indium oxide and tin oxide) (Flint glass made by Nippon Sheet Glass) were sandwiched with a spacer to make a cell thickness of 5 μm, and two transparent electrodes were prepared. Inject the mixture in between. A static magnetic field of 50,000 Gauss is applied from the direction in which the injected cell is tilted 3 ° from the direction perpendicular to the electrode (liquid crystal display element surface), and the electrode (liquid crystal display element surface) is applied in that state.
20mW / c on the cell surface using a mirror from a direction perpendicular to
UV irradiation was performed with a high-pressure mercury lamp so that m ² was obtained.

The cell thus prepared is placed in two polarizing plates in the crossed Nicols state while shining light from the light source on the back side.
As a result of observing the cell while applying a voltage of KHz, a good display without color unevenness was obtained.

Example 2 Liquid crystal ZLI-4788-000 (4.3 g), TMPT (trimethylolpropane triacrylate: manufactured by Shin Nakamura Chemical Co., Ltd.) 0.2 g, 2-ethylhexyl acrylate (manufactured by Nippon Kayaku Co., Ltd.) 0.5 g To the mixture, 0.05 g of Irgacure 184 UV curing agent manufactured by Ciba-Geigy was added at 80 ° C.
Mix evenly with.

The prepared mixture was injected into the same cell as in Example 1, and a static magnetic field of 50,000 gauss was applied from the direction in which the cell was tilted 3 ° from the direction perpendicular to the electrode (liquid crystal display element surface). UV irradiation is performed in the same manner as in Example 1 to form a cell.

The cell thus prepared is placed in two polarizing plates in the crossed Nicols state, and light is applied from the light source on the back surface.
As a result of observing the cell while applying a voltage of 50 KHz, good display without color unevenness was obtained.

Example 3 TMPT (previously described): A 7: 3 mixture of NK Oligo U-122A (manufactured by Shin-Nakamura Chemical Co., Ltd.) was applied as a 5% solution of n-hexane on a glass substrate with a transparent electrode by a spin coat method. Then, the solvent is evaporated to form a thin film.

Two substrates are attached to each other through a 10 μm spacer to form a cell. The same liquid crystal material as in Example 1 was injected into the cell, a static magnetic field of 50,000 Gauss was applied from a direction tilted by 3 ° from a direction perpendicular to the electrode (liquid crystal display element surface), and the electrode was left as it was. UV irradiation was performed from a direction perpendicular to the (liquid crystal display element surface) with a high pressure mercury lamp at 20 mW / cm ² (365 nm).

As a result of applying a voltage to the prepared cell in the same manner as in Example 1, good display without color unevenness was obtained.

[0057]

According to the first aspect of the present invention, the liquid crystal molecules are applied with an electric field having a frequency having a negative dielectric anisotropy, and the molecular axes of the liquid crystal molecules are oriented from 0 to 70 ° with respect to the vertical direction of the electrodes. The second invention is composed of a liquid crystal material for dual frequency driving and a liquid crystal material having negative dielectric constant anisotropy and positive magnetic permeability anisotropy. The third invention is a liquid crystal material for dual frequency driving. When a mixture of a polymerizable monomer and an oligomer soluble with respect to the liquid crystal material for driving the dual frequency is injected between the electrodes and the polymerizable monomer and the oligomer are polymerized, a vertical direction of the electrodes is provided between the electrodes. An electric field and a magnetic field having a frequency such that the dielectric anisotropy of the liquid crystal material is positive at an angle of 0 to 70 ° are applied, and the fourth invention is that the dielectric anisotropy is negative and the magnetic anisotropy is negative. Of positive liquid crystal and a polymerizable monomer soluble in the liquid crystal material A mixture of a polymer and an oligomer with 2
0 to 70 with respect to the vertical direction of the electrodes when pouring between the electrodes and polymerizing the polymerizable monomer and oligomer.
A magnetic field is applied to the cell at an angle of °, and the fifth invention is to use a substrate on which a mixture of a polymerizable monomer and an oligomer is applied as a thin film on an electrode and to leave two substrates through a spacer with an unpolymerized substance remaining. After creating cells by combining them and injecting a liquid crystal material for dual frequency driving between the cells, a frequency at which the dielectric anisotropy of the liquid crystal material becomes positive at an angle of 0 to 70 ° with respect to the vertical direction of the electrodes. Since the cell in which the polymerizable compound is cured in the electric field and the magnetic field is combined with the two polarizing plates, the liquid crystal is uniform in the cell plane in the matrix of the polymer substance in the cell. Since it has a vertical orientation with a slight tilt angle, it is possible to produce an ECB element with little display unevenness on a large area with good reproducibility.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an alignment state when an electric field is off in a specific example of an electric field birefringence control type liquid crystal element of the present invention.

FIG. 2 is a diagram illustrating the alignment of liquid crystal molecules of the liquid crystal element of FIG.

FIG. 3 is a cross-sectional view showing a horizontal state of an alignment state when an electric field is turned on in a specific example of the electric field birefringence control type liquid crystal element of the present invention.

[Explanation of symbols]

 10 Polarizing plate 11 Glass substrate 12 Polymer material 13 Liquid crystal material 14 Liquid crystal molecule 15 Transparent electrode

Front page continuation (72) Inventor Shuichi Kanzaki 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka

Claims (5)

[Claims] 1. A polymer, at least one of which is transparent and which is sealed between two electrodes provided with a polarizing plate, and at least one of continuous and discontinuous forms in the polymer. Liquid crystal molecules dispersed and applied with an electric field of a frequency having a negative dielectric anisotropy from the electrodes, the liquid crystal molecules having a molecular axis of 0 to 70 ° with respect to a vertical direction of the cell. An electric field birefringence control type liquid crystal device characterized by being oriented. 2. A liquid crystal material for dual-frequency driving and a liquid crystal material having a negative dielectric anisotropy and a positive magnetic permeability anisotropy. Liquid crystal element. 3. Injecting a mixture of a two-frequency driving liquid crystal material and a polymerizable monomer and an oligomer soluble in the two-frequency driving liquid crystal material between two electrodes, at least one of which is transparent, The polymerizable monomer in the mixture
And a step of applying an electric field and a magnetic field having a frequency such that the dielectric anisotropy of the liquid crystal material is positive at an angle of 0 to 70 ° with respect to the vertical direction of the electrode when polymerizing the oligomer, The method for manufacturing an electric field birefringence control type liquid crystal device according to claim 1, further comprising: adhering a polarizing plate to the cell. 4. A mixture of a liquid crystal material having a negative dielectric anisotropy and a positive magnetic permeability anisotropy and a polymerizable monomer or oligomer soluble in the liquid crystal material, at least one of which is transparent. Injecting between the electrodes and when polymerizing the polymerizable monomer and the oligomer in the mixture,
The electric field birefringence control type device according to claim 1, comprising: applying a magnetic field to the cell at an angle of 0 to 70 ° with respect to a vertical direction of the electrode; and bonding a polarizing plate to the cell. Liquid crystal element manufacturing method. 5. A step of preparing a cell by combining two substrates, each having a mixture of a polymerizable monomer and an oligomer coated on a transparent electrode in a thin film, through a spacer while leaving an unpolymerized substance, After injecting a liquid crystal material for driving two frequencies between the cells, an electric field and a magnetic field having a frequency such that the dielectric anisotropy of the liquid crystal material becomes positive at an angle of 0 to 70 ° with respect to the vertical direction of the electrodes are applied. And a step of combining a cell obtained by curing a polymerizable compound in the electric field and a magnetic field with two polarizing plates, the method for producing an electric field birefringence control type liquid crystal element.