JPH06130372A - Liquid crystal display element - Google Patents

Abstract

(57) [Abstract] [Purpose] A liquid crystal display element that can be driven at a low voltage and has sufficient contrast, and has a small pixel pattern and high visibility even when it is fine, for example, in dot matrix display. provide. [Structure] A film thickness of a mixed film 1 containing a side chain type liquid crystalline polymer and a low molecular weight liquid crystal material is controlled to 1 to 5 μm, and a pair of transparent conductive substrates 2 sandwiching the mixed film 1 are sandwiched, A pair of polarizers 3 are arranged with their polarization axes crossing each other.

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 element used for a display device for general office automation equipment or on-vehicle displays such as automobiles.

[0002]

2. Description of the Related Art Recently, a side chain type liquid crystalline polymer in which a side chain having a portion corresponding to a liquid crystal compound is bonded to a skeletal chain of a polymer through a flexible carbon skeleton and a normal low molecular weight liquid crystal A solution prepared by dissolving a material and a solvent in a solvent is cast onto a plate-shaped or film-shaped transparent conductive substrate and the solvent is removed to form a polymer liquid crystal / low-molecular liquid crystal mixed film. A liquid crystal display device having a structure in which another transparent conductive substrate is superposed on the liquid crystal display device has been developed by a group of Professor Chisato Kajiyama of Kyushu University (JP-A-2-193115 and JP-A-2-127494). , Chem. Lett., 817
(1989), Polym. Preprints, Japan 39 (3) 761 (1990)
Etc.).

In this liquid crystal display element, when a high-frequency electric field of, for example, about 1 KHz is applied to a polymer liquid crystal / low-molecular liquid crystal mixed film, the liquid crystal molecules are homeotropically aligned in the electric field direction, and incident light is not scattered. It becomes possible to pass through and the mixed film becomes transparent. When a low-frequency or direct-current electric field is applied to the mixed film, the electrolyte in the mixed film (usually, a small amount added and controlled) moves in association with the electric field, resulting in a side chain type liquid crystalline polymer. When it collides with the main chain of the above and disturbs the alignment of the above-mentioned homeotropically aligned liquid crystal molecules on a molecular order, the incident light is strongly scattered and the electro-optical effect that the mixed film becomes cloudy Show. That is, in the above polymer liquid crystal / low molecular weight liquid crystal mixed film, the side chain type liquid crystal polymer (particularly its main chain component) and the electrolyte are essential for the clouding response. The technical point is that it is a homogeneous system in which low-molecular liquid crystal materials are uniformly mixed in the molecular order.

Since the liquid crystal phase of the liquid crystal display device having the above-mentioned polymer liquid crystal / low molecular weight liquid crystal mixed film is a smectic phase, when the electric field is removed in both of the above states, a light scattering state or a non-scattering state is obtained. It has a memory function to hold the stable. Further, this liquid crystal display device is a mixture of a polymer liquid crystal / low molecular liquid crystal having a liquid crystal display function, simply by coating a solution containing a liquid crystal polymer and a low molecular weight liquid crystal material on a transparent conductive substrate and drying. Since a film can be formed, there is an advantage that the area of the liquid crystal display element can be easily increased.

As a technique similar to the above-mentioned polymer liquid crystal / low-molecular liquid crystal mixed film, a so-called encapsulated liquid crystal disclosed in Japanese Patent Publication No. 3-52843 and Japanese Patent Publication No. 63-501.
There are polymer-dispersed liquid crystals and the like disclosed in Japanese Patent Laid-Open No. 512 and Japanese Patent Publication No. 2-503963. However, in all of these systems, the matrix polymer phase and the liquid crystal phase are in a phase-separated state, and the white turbid state observed when no electric field is applied indicates the existence of the interface between the liquid crystal and the polymer and the difference in the refractive index at the interface. The point caused by other factors is a significant difference from the polymer liquid crystal / low molecular weight liquid crystal mixed film including the present invention.

In the encapsulated liquid crystal and the polymer dispersed liquid crystal,
Since the liquid crystal in the film has a droplet or domain-like morphology of about 1 to 10 μm, in order to obtain a sufficient light scattering (white turbidity) effect, a film thickness of about 7 to 8 μm or more (distance between substrates) is usually required. is necessary. If the film thickness is less than that, it is impossible to uniformly disperse and hold the liquid crystal droplets in the film, and the effect of disturbing the alignment of the liquid crystal becomes small especially when no electric field is applied,
The liquid crystal alignment cannot be sufficiently randomized, and as a result, the degree of white turbidity is significantly deteriorated.

On the other hand, in the polymer liquid crystal / low molecular liquid crystal mixed film adopted in the present invention, sufficient white turbidity is exhibited even when the film thickness (distance between substrates) is about 5 μm, and the degree is small even at about 1 to 2 μm. However, it was revealed from the study by the present inventors that a white turbid response occurs. Even if the thickness of the polymer liquid crystal / low molecular weight liquid crystal mixed film is made thin, a sufficient clouding response is generated because the mechanism of clouding in the mixed film does not depend on the structure of phase separation but on the liquid crystal in the molecular order. It is considered that this is because the disorder of the arrangement of the molecules is caused and the phase separation structure in the film is unnecessary.

[0008]

However, conventionally, in order to obtain a sufficiently clear display in a liquid crystal display device provided with a polymer liquid crystal / low molecular weight liquid crystal mixed film, the thickness of the mixed film (distance between the substrates) is set. It is necessary to set the thickness to about 10 μm or more, and there is a problem that the driving voltage must be increased to 60 to 100 V in order to sufficiently shorten the response time.

The reason for this is that the operation of the mixed film is
For example, because it is not a clear change between white and black, but a change between transparent and cloudy, it is difficult to see as contrast, especially in direct-view display (reflection type or transmissive type with backlight). Although not as high as the polymer-dispersed liquid crystal, the degree of white turbidity also tends to decrease as the thickness of the mixed film becomes thinner.
In the mixed film of ˜2 μm, the degree of white turbidity is lower than that of the mixed film of 10 μm by visual observation.

This problem becomes more noticeable as the pixel pattern becomes smaller and finer in dot matrix display and the like. In other words, since there is basically no light absorption when changing from transparent to cloudy, it becomes extremely difficult to recognize the difference between cloudy and transparent when a large number of minute dots are collected. It is conceivable that black paper is placed behind the device to display black when transparent, but if the mixed film is thin and the degree of cloudiness is low as described above, the black on the cloudy part The result is that the contrast is not improved.

The present invention has been made in view of the above circumstances, and since the film thickness of the polymer liquid crystal / low molecular weight liquid crystal mixed film is thinner than before, it can be driven at a low voltage and has a sufficient contrast. It is an object of the present invention to provide a liquid crystal display element having a small pixel pattern and high visibility even when the pixel pattern becomes finer in, for example, dot matrix display.

[0012]

A liquid crystal display device of the present invention for solving the above-mentioned problems includes a pair of transparent conductive films including a mixed film containing at least a side chain type liquid crystalline polymer and a low molecular weight liquid crystal material. In a liquid crystal display element sandwiched between transparent substrates, the distance between the substrates is controlled to be 1 to 5 μm, and a pair of polarizers are disposed with both substrates sandwiched so that their polarization axes intersect each other. It is characterized by being.

In the liquid crystal display device of the present invention having the above-mentioned structure, when a high frequency electric field of, for example, 1 KHz or more is applied to the mixed film and the liquid crystal molecules are homeotropically oriented in the electric field direction, the device is black or light opaque. Presents a state,
When a low-frequency or direct-current electric field is applied to randomize the alignment of liquid crystal molecules on a molecular order, the device exhibits a white or light transmitting state. In other words, the liquid crystal display element of the present invention has a change in transparency ⇔ white turbidity, depending on the applied voltage, and not black ⇔ white or light non-transmission ⇔ light transmission. To do.

Further, according to the study by the present inventors, the contrast of the change of black ⇔ white or the non-transmission of light ⇔ light transmission is, surprisingly, 1% of the thickness of the mixed film (distance between substrates).
It was confirmed that even if the thickness was reduced to about 2 μm, it was almost constant. Therefore, according to the present invention, it was confirmed that the driving voltage of the element can be remarkably reduced. This fact supports the fact that the mechanism of white turbidity in the mixed film is caused by the disorder of the alignment of the liquid crystal molecules in the molecular order.

Another advantage of reducing the thickness of the mixed film is that the electric field strength when the same voltage is applied increases as the thickness of the mixed film becomes smaller. It is possible to increase the response speed of the device. That is, in the TN type liquid crystal display, the response time τon in which the liquid crystal molecules go from the random state to the homeotropic alignment is theoretically τon = ηd ² / ΔεV ² (where η is a proportional constant indicating viscosity and Δε is The dielectric anisotropy, d is the distance between the substrates, and V is the applied voltage.) As a result, it is inversely proportional to the square of the electric field strength V / d. The response speed of the device becomes faster.

However, the actual response speed does not improve as much as can be obtained from the above theoretical formula. For example, film thickness 10 μm
Response time τon when a high-frequency voltage of 60 V is applied
When the mixed film is 100ms, the film thickness is ⅕ of 2μm
If so, the response time should be 1/25, but the actual display of the element is from white to black (or from light transmission to light non-transmission).
The response time Toff (white → black) [corresponding to τon above] that changes to about several tens of ms. It is presumed that this is because the influence of the regulation force exerted on the liquid crystal molecules from the substrate surface becomes more remarkable as the mixed film becomes thinner.

On the other hand, the response time τ off in which the homeotropically aligned liquid crystal molecules are randomized, that is, the response time Ton (black → white) at which the actual display of the element changes from black to white (or from light non-transmission to light transmission) is However, even if the thickness of the mixed film is reduced, no significant change is observed. This is Ton (= τof
It is considered that the dominant factor of f) is other than the electric field strength. But at least Toff (white ⇒ black)
The higher speed is practically useful for improving the speed of line-sequential writing during matrix driving.

Regarding the above-mentioned encapsulated liquid crystal and polymer-dispersed liquid crystal, a combination of a pair of polarizers was used in the same manner as in the present invention, and the relationship between the film thickness and the contrast was examined. As the film thickness became thinner, the contrast deteriorated. From this, however, it was found that in the encapsulated liquid crystal and the polymer-dispersed liquid crystal, the thinner the film thickness, the less the randomness of the liquid crystal alignment. Therefore, it was confirmed that even if the constitution of the present invention is applied to a phase separation system, no substantial effect can be obtained.

The present invention will be described below. In the liquid crystal display element of the present invention, as shown in FIG. 1, the mixed film 1 is sandwiched between a pair of transparent conductive substrates 2 and 2, and the both substrates 2 and 2 are
As shown by the arrow in the figure, it is constituted by sandwiching it between a pair of polarizers 3, 3. The mixed film 1 is formed by sandwiching a mixture of at least a side chain type liquid crystalline polymer and a low molecular weight liquid crystal material between the pair of transparent conductive substrates 2 and 2.

As the side chain type liquid crystalline polymer which constitutes the mixed film 1, a structure in which a side chain liquid crystal group is grafted to a polymer skeleton via a flexible carbon skeleton is preferably used. . The main chain enhances the self-holding property of the entire system, and in order to quickly convey the disorder of the liquid crystal alignment caused by the movement and collision of the electrolyte when a DC or low-frequency electric field is applied, a plurality of main chains are used. It is preferable that they are linked (ie, crosslinked) to each other.

The cross-linking of the side chain type liquid crystalline polymer may be carried out directly between the main chains or may be carried out via a suitable cross-linking agent. Further, in some cases, the main chains may be cross-linked via the side chain liquid crystal group. The bond structure for crosslinking may be any chemical bond (covalent bond, ionic bond, hydrogen bond, coordinate bond, etc.). The chemical structure of the main chain may be arbitrary, but it is preferable that the structure includes a flexible structure to some extent, and examples thereof include, but are not limited to, for example, polysiloxane chains, polyethylene oxide chains,
Examples thereof include polypropylene oxide chains and polyoxetane chains.

The side chain liquid crystal group is not particularly limited,
Various conventionally known liquid crystal groups can be arbitrarily adopted. The molecular weight of the side chain type liquid crystalline polymer is not particularly limited, but usually about 100,000 is preferable. Such side chain type liquid crystalline polymers may be used alone or in combination of two or more.

Mixed film 1 together with the above side chain type liquid crystalline polymer
The low-molecular weight component (which is referred to herein as "low-molecular weight") means that it does not have a main chain structure or side chain structure like liquid crystalline polymers, and is not defined by molecular weight. As the liquid crystal material, various commercially available or publicly known and generally used single-component or multi-component liquid crystal materials excluding the main chain type or side chain type liquid crystalline polymer can be used.

As the physical properties of the low molecular weight liquid crystal material, those having a large dielectric anisotropy Δε and those having a large refractive index anisotropy Δn are preferable. Further, as a particularly important factor, it is possible to exhibit a smectic phase when mixed with a side chain type liquid crystalline polymer. Thereby, the mixed film 1 can exhibit the memory property as described above. Such liquid crystal materials may be used alone or in combination of two or more.

The mixing ratio of the side chain type liquid crystalline polymer and the low molecular weight liquid crystal material constituting the mixed film 1 is not particularly limited, but the ratio of the side chain type liquid crystalline polymer to the total liquid crystal is 5 to 5.
It is preferably in the range of 60% by weight, and 10 to 30
More preferably, it is within the range of wt%. When the ratio of the side chain type liquid crystalline polymer exceeds the above range, the response speed of the device may be slowed down. On the contrary, when the ratio of the side chain type liquid crystalline polymer is less than the above range, the mixed film 1 There is a risk that the self-supporting property of will be insufficient.

A minute amount of electrolyte is blended in the mixed film 1 as described above. Any electrolyte can be used as long as it can be dissolved in the coating liquid, for example, a general formula:

[0027]

[Chemical 1]

(Wherein R ¹ , R ² , R ³ and R ⁴ are the same or different and are methyl, ethyl, propyl, isopropyl,
X represents an alkyl group such as butyl, pentyl, and hexyl, and X
Represents F, Cl, Br, I, ClO ₄ , PF ₄ , BF _4, etc. ) A quaternary ammonium salt represented by the formula () is preferred. The addition amount of the electrolyte is preferably 0.005 to 1% by weight based on the total amount of the mixed film 1. These electrolytes may be used alone or in combination of two or more.

However, when the side chain type liquid crystalline polymer or the low molecular weight liquid crystal material itself contains an ionic group, the addition of the above electrolyte may be omitted. In order to color the display, the mixed film 1 composed of the above-mentioned components contains various conventionally known 2
A color dye can also be blended. The film thickness of the mixed film 1 is
In the present invention, it is limited to 1 to 5 μm. If the thickness of the mixed film 1 is less than 1 μm, the contrast of the change of black⇔white or light non-transmission⇔light transmission is lowered, and the visibility when the pixel pattern is small and fine, especially in dot matrix display, etc. Becomes insufficient. Further, when a device is manufactured by a laminating method described later, it is difficult to obtain a spacer having a diameter of less than 1 μm as a material that defines the film thickness of the mixed film 1. The thickness of the mixed film 1 is limited to 1 μm or more.

On the other hand, when the thickness of the mixed film 1 exceeds 5 μm, the driving voltage becomes high. The pair of transparent conductive substrates 2 and 2 for sandwiching the mixed film 1 is, for example, a plastic film such as a polyethylene terephthalate (PET) film or a polyether sulfone (PES) film, or a surface of a transparent support such as a glass plate. The transparent conductive film such as ITO (Indium Tin Oxide) or SnO ₂ is formed by vapor deposition, sputtering method, coating method or the like. In addition, transparent conductive glass or transparent conductive film used for ordinary liquid crystal display elements is used. You can also do it.

As the pair of polarizers 3 and 3 arranged so as to sandwich the transparent conductive substrates 2 and 2, commercially available products in the shape of film, plate or the like are used. The pair of polarizers 3 and 3 are
The polarization axes are arranged so as to intersect each other. The crossing angle is not particularly limited, but the contrast becomes highest when it is about 90 °. Unlike the case of the ferroelectric liquid crystal, in this method, it is not necessary to align the surfaces of the substrates 2 and 2, so that the angles of the polarization axes of the polarizers 3 and 3 with respect to the substrates 2 and 2 can be set arbitrarily. The polarizers 3 and 3 may be directly attached to the surfaces of the substrates 2 and 2, or may be attached to other base materials and laminated.

The liquid crystal display element of the present invention is similar to the conventional one,
A coating solution prepared by dissolving each of the above components in a suitable solvent is coated on one transparent conductive substrate 2, the solvent is removed to form a mixed film 1, and then the other transparent conductive film is formed on the mixed film 1. Board 2
And a pair of polarizers 3 and 3 on the outside.
Are laminated with their polarization axes crossing each other. Therefore, manufacturing is easy, and the number of steps can be reduced. The mixing ratio of each component contained in the coating liquid is
It can be appropriately set according to the type of coating method for coating the coating liquid on the transparent conductive substrate 2 and the thickness of the mixed film 1 to be formed.

In order to apply the coating liquid onto the transparent conductive substrate 2, various conventionally known coating methods such as bar coating method, spin coating method, spray coating method and roller coating method can be adopted. . Further, the liquid crystal display element of the present invention is obtained by dissolving each of the above components and a spacer S having a uniform diameter such as glass, ceramics, plastics and the like having a fine spherical shape, a rod shape or the like in a solvent, and then removing the solvent by drying. To prepare a pasty liquid crystal mixture P, which is shown in FIG.
It can also be manufactured by sandwiching it with a pair of transparent conductive substrates 2 and 2 and laminating with a laminating roll R 1 and then laminating a pair of polarizers 3 and 3 on the outer side as shown in FIG. As the spacer S, a commercially available one can be used.

The structure of the liquid crystal display device of the present invention is particularly effective for a display device of a matrix display system using minute dots, in which a large number of pixels each having a small area are arranged adjacent to each other and each pixel is independently controlled. is there. This is because the operation of the liquid crystal display device of the present invention is a change between black and white or light non-transmission and light transmission as described above, and the visibility is higher than that of the conventional transparent and white turbid. In particular, by arranging a backlight behind the element, it is possible to further improve the visibility. For example, when the dots are 1 mm square or less, the characteristic becomes remarkable.

Further, in the matrix display type display element, the memory property of the mixed film 1 is utilized to perform line-sequential writing (writing is performed line by line, and after writing, the write data is held by utilizing the characteristic of the mixed film. In this case, the writing time of the entire surface of the element is determined by the writing time of one line × the number of lines. Therefore, the shorter the one-line writing time, the shorter the writing time on the entire surface of the element, and the higher speed display becomes possible. In the present invention, by setting the thickness of the mixed film 1 within the range of 1 to 5 μm, as described above, at least the response time Toff for displaying black (white → black)
As a result, the writing time on the entire surface of the device can be shortened.

[0036]

EXAMPLES The present invention will be described below based on Examples and Comparative Examples. Example 1 The following formula (1):

[0037]

[Chemical 2]

20 parts by weight of a side chain type liquid crystalline polymer comprising a repeating unit represented by the formula (4) and 4-n-pentylbenzoic acid-4'-n-as a low molecular weight liquid crystal material.
Octyloxyphenyl ester 20 parts by weight and 4'-
60 parts by weight of octyl-4-biphenylcarbonitrile, 0.05% by weight of tetraethylammonium bromide (electrolyte) with respect to the total amount of each liquid crystal, and 1% by weight of fine spherical silica spacers (electrolyte) with respect to the total amount of liquid crystals ( And a particle size of 2 μm) were uniformly mixed to prepare a paste-like mixture.

Next, this mixture was placed on the conductive surface of a transparent conductive film (PES-ITO, thickness 100 μm, manufactured by Sumitomo Bakelite Co., Ltd.), and another transparent conductive film was placed so that the conductive surface was in contact with the mixture. While stacking, as shown in FIG. 2, a lamination process was performed by passing between two laminating rolls R, R to form a mixed film between a pair of transparent conductive films. Then, a pair of polarizers (manufactured by Nitto Denko Corporation) were laminated and adhered on the surfaces of the both transparent conductive films so that their polarization axes were orthogonal to each other, to produce a liquid crystal display device having a layer structure shown in FIG. .

Example 2 A liquid crystal display device was produced in the same manner as in Example 1 except that the fine spherical spacer made of benzoguanamine resin having a particle size of 5 μm was mixed in the same amount in place of the fine spherical silica spacer. Comparative Example 1 A liquid crystal display device was produced in the same manner as in Example 1 except that the fine spherical spacer made of benzoguanamine resin having a particle size of 10 μm was mixed in the same amount in place of the fine spherical silica spacer.

A thin backlight was arranged behind the liquid crystal display device of each of the examples and comparative examples, and a luminance meter (manufactured by Minolta Co., Ltd.) was arranged in front of the device. Then, with this luminance meter, the luminance when applying a high-frequency electric field of 60 V and 1 KHz to the mixed film to make the element in the light non-transmissive state was measured as the luminance when black (cd / m ² ), and 60 V was applied to the mixed film. The luminance when the element was brought into a light transmitting state by applying a DC electric field was measured as luminance when white (cd / m ² ). In addition, the contrast of the device was calculated from the measured values of the brightness when black and the brightness when white by the following formula.

[0042]

[Equation 1]

The above results are shown in Table 1.

[0044]

[Table 1]

From the results in Table 1 above, it was found that the contrast did not deteriorate even when the mixed film was thinned to 2 μm. Example 3 27.5 parts by weight of poly (4-cyanophenyl-4′-hexyloxybenzoate methylsiloxane) as a cross-linked side chain type liquid crystalline polymer and 4-n-pentylbenzoic acid as a low molecular weight liquid crystal material. Acid-4'-n-octyloxyphenyl ester 31.7 parts by weight and mixed nematic liquid crystal (product number BL00 manufactured by Merck Japan Ltd.
7) 40.8 parts by weight, and 0.
0.05 wt% of tetraethylammonium bromide (electrolyte) and 1 wt% of fine spherical silica spacers (particle size 2 μm) were uniformly mixed with the total amount of liquid crystal to prepare a paste-like mixture.

Then, using this mixture, the above-mentioned Example 1 was used.
A liquid crystal display device was produced in the same manner as in. Example 4 A liquid crystal display device was produced in the same manner as in Example 3 except that the fine spherical spacer made of benzoguanamine resin having a particle diameter of 5 μm was mixed in the same amount in place of the fine spherical silica spacer.

Comparative Example 2 A liquid crystal display device was manufactured in the same manner as in Example 3 except that the fine spherical spacer made of benzoguanamine resin having a particle size of 7 μm was mixed in the same amount in place of the fine spherical silica spacer. Comparative Example 3 A liquid crystal display device was produced in the same manner as in Example 3 except that the fine spherical spacer made of benzoguanamine resin having a particle diameter of 10 μm was mixed in the same amount in place of the fine spherical silica spacer.

With the liquid crystal display device of each of the examples and comparative examples set in a spectrophotometer, 60 V and 1 KH were applied to the mixed film.
When a high frequency electric field of z is applied, the transmittance of He-Ne laser light (wavelength 633 nm) is 90% to 1 of the saturated transmittance.
When the time to decay to 0% is light transmission ⇒ light non-transmission response time Toff (seconds), and when a 60 V, DC electric field is applied to the mixed film, the transmittance of He-Ne laser light (wavelength 633 nm) is saturated. The time required to reach 10% to 90% of the transmittance was measured as light non-transmission → light transmission response time Ton (seconds). The results are shown in Table 2.

[0049]

[Table 2]

From the results shown in Table 2 above, the film thickness of the mixed film was 5 μm.
In each of Examples 3 and 4 in which the thickness was set to m or less, the response time Toff of light transmission → light non-transmission was shorter than that of Comparative Examples 2 and 3, and it was found from this that it has a high-speed response.

[0051]

As described in detail above, in the liquid crystal display element of the present invention, a pair of transparent conductive substrates sandwiching a mixed film are sandwiched and a pair of polarizers are made to cross their polarization axes. Since the mixed film is arranged as a thin film, it has sufficient contrast and high visibility even if the mixed film is thin. Therefore, the liquid crystal display device of the present invention is capable of high contrast and high-speed response, particularly in the display by minute dots using a plastic substrate, and is useful as a display device for general OA equipment or on-vehicle displays such as automobiles. .

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a layer structure of a liquid crystal display element of the present invention.

FIG. 2 is a side view showing a step of producing a mixed film of the liquid crystal display element of the present invention by a laminating method.

[Explanation of symbols]

 1 mixed film 2 transparent conductive substrate 3 polarizer

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kensaku Takada 1-3-1 Shimaya, Konohana-ku, Osaka Sumitomo Electric Industries, Ltd. Osaka Works

Claims (3)

[Claims] 1. A liquid crystal display device comprising a pair of transparent conductive substrates sandwiching a mixed film containing at least a side chain type liquid crystalline polymer and a low molecular weight liquid crystal material.
A liquid crystal display device, characterized in that it is controlled to 5 μm, and a pair of polarizers are arranged so as to sandwich both substrates, with their polarization axes crossing each other. 2. The liquid crystal display element according to claim 1, wherein the side chain type liquid crystalline polymer has a crosslinked structure. 3. A conductive surface of a transparent conductive substrate is patterned into a stripe shape, and a pair of transparent conductive substrates are arranged so that their stripe patterns intersect with each other, whereby a dot matrix shape is formed on the device. The liquid crystal display element according to claim 1, wherein pixels are formed.