JPH06242423A - Polymer dispersion type liquid crystal display device and its manufacture - Google Patents

Abstract

PURPOSE:To facilitate pattern coating, to reduce a waste of liquid crystal dispersion liquid, and to leave no air bubble in a liquid crystal/polymer composite film by forming the liquid crystal/polymer composite film in plural partitioned rooms partitioned with a partition wall formed of an electric insulating material on the surface of an electrode substrate. CONSTITUTION:A transparent conductive film 2 such as an ITO film is formed on the top surface of the transparent substrate and the electrically insulating partition wall 3 which partitions the film surface into optional areas is provided on the transparent conductive film 3. The partition wall 3 is formed generally in a shape corresponding to a purpose such as a multiple parallel line shape, a quadrilateral shape, a polygonal shape, and a square shape. General liquid photoresist, dry photoresist, etc., are usable as the forming material of this partition wall 3. Then a mask 4 is superposed on the substrate surface where the partition wall 3 is provided, and liquid crystal dispersed liquid 5 after air bubbles are sufficiently removed is applied gently, flattened, and dried. In this case, liquid crystal dispersed liquid colored differently with dichroic dyestuff is used and this operation is repeated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polymer dispersion type liquid crystal display device (hereinafter simply referred to as a liquid crystal display device), and more specifically, a liquid crystal / polymer composite film in which liquid crystal is dispersed in a polymer substance is used. The present invention relates to a liquid crystal display device.

[0002]

2. Description of the Related Art Conventionally, liquid crystal displays have been widely used as wristwatches, calculators, personal computers, televisions, etc., as a display medium for characters and images because they have characteristics such as low power consumption, light weight and thin shape. . A general TN or STN type liquid crystal display is one in which liquid crystal is enclosed in a liquid crystal cell in which a glass plate having transparent electrodes is provided with a predetermined seal or the like, and further sandwiched by polarizing plates from both sides. However, the above-mentioned conventional liquid crystal display (1) requires two polarizing plates and thus has a narrow viewing angle and lacks brightness, and thus requires a backlight with high power consumption. (2)
There is a problem that the manufacturing cost is high due to the complicated manufacturing process such as (3) formation of an alignment film, rubbing treatment, encapsulation of liquid crystal in a cell, etc. because of large dependence on cell thickness and difficulty in increasing the area. Therefore, there is a limit to the weight reduction, the thickness reduction, the area increase, the power consumption reduction, and the cost reduction of the liquid crystal display.

As a liquid crystal display medium for solving such problems, a liquid crystal in which a liquid crystal is dispersed in a polymer matrix /
Applications of polymer composite membranes are expected, and their research and development have been activated. The following techniques have already been disclosed.
The liquid crystal / polymer composite film manufacturing method can be mainly classified into an emulsion method and a phase separation method. The emulsion method includes a method of preparing an aqueous solution in which a liquid crystal is emulsified using polyvinyl alcohol (PVA) as a protective colloid (Japanese Patent Publication No. 58-501631), and a method of preparing a liquid crystal emulsion from an aqueous solution by mixing with a latex. 60
No. 252687) and the like.

On the other hand, the phase separation method can be classified into a method of fixing the phase separation state of the liquid crystal and the matrix resin and a method of phase separation of the liquid crystal from the matrix resin during film formation. As a method of fixing the phase separation state, a method of dispersing a liquid crystal in an epoxy resin and then curing it (Japanese Patent Publication No. Sho 61-
No. 502128), a method of dispersing a liquid crystal in an ultraviolet curable resin and then curing it (Japanese Patent Publication No. 62-2231). As a method of phase-separating liquid crystals at the time of forming a film, a method of phase-separating during curing, a method of phase-separating during solvent evaporation, and a method of phase-separating during cooling process of a thermoplastic resin are disclosed in JP-A-63-501512. Although disclosed in the publication, various improved techniques have been reported.

As a method of phase separation during curing, a method of phase separation of liquid crystal during curing in a liquid crystal and an ultraviolet curable resin mixture system (Japanese Patent Laid-Open Nos. 63-271233 and 1-252689). Method of phase separation of liquid crystal during heat curing in liquid crystal and thermosetting epoxy resin mixture system (JP-A-63-287820, JP-A-1-29)
9022). As a method of phase separation during evaporation of the solvent, a method using an acrylic resin having an active hydroxyl group as a matrix (Japanese Patent Laid-Open No. 1-230693), a method using cellulose acetate as a matrix (Japanese Patent Laid-Open No. 63-124025), A matrix having a resin that is incompatible with liquid crystal (Japanese Patent Laid-Open No. 63-43)
993).

[0006]

Problems to be Solved by the Invention By using a liquid crystal / polymer composite film, a bright liquid crystal display device having high light utilization efficiency can be obtained, and a coating method can be used for manufacturing, and there is a possibility of cost reduction. Although it seems to be an extremely advantageous method at first glance, there are various problems in actual manufacturing. Especially, since the coating suitability of the coating liquid itself is not preferable,
There is a problem that a liquid crystal / polymer composite film having excellent characteristics cannot be obtained depending on the coating method. A liquid crystal dispersion solution obtained by mixing and stirring an aqueous solution of a water-soluble polymer substance and liquid crystal,
In order to improve the electro-optical characteristics such as a decrease in driving voltage, the liquid crystal component is set to 80 to 90% by weight and the polymer substance component is made as small as possible. However, the liquid crystal dispersion liquid is a water-soluble polymer substance. Since it has a thixotropic property peculiar to the aqueous solution, it is difficult to remove air bubbles in the mixed air. In products such as display devices, the presence of air bubbles is a fatal problem, and in particular, air bubbles mixed in at the time of application cannot be removed, and commercialization is extremely difficult. Therefore, it is difficult to satisfy the required uniformization of the voltage characteristics in the liquid crystal display device.

Further, even in the phase separation type, since the polymer matrix component must be reduced as much as possible, the wettability of the liquid to the substrate is poor, and the liquid is repelled so that it is difficult to form a uniform film. Is. As described above, various coating methods cannot be effectively applied because of poor coating suitability. For example, the blade coating method has problems such as coating film edges, coating unevenness at the beginning and end of coating, and further, it is impossible to perform pattern coating and uses an expensive extra liquid crystal emulsion. or,
The screen printing method has a problem that bubbles are generated at the time of passing through the mesh and the backside of the emulsion on the back surface of the plate. Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, pattern coating is extremely easy, the liquid crystal emulsion is not wasted, and the liquid crystal / polymer composite film in a liquid crystal display device contains no bubbles. An object of the present invention is to provide a liquid crystal display device having excellent display characteristics.

[0008]

The above object can be achieved by the present invention described below. That is, the present invention provides a liquid crystal display device in which a liquid crystal / polymer composite film is sandwiched between a pair of transparent electrode substrates, at least one of which is transparent. A liquid crystal display device formed in a plurality of compartments partitioned by partitions made of an insulating material and colored with a dichroic dye, and a manufacturing method thereof.

[0009]

The liquid crystal display device of the present invention is provided with a partition wall having a predetermined height on the surface of the transparent substrate, and the liquid crystal emulsion can be filled by a squeegee method in the partition chamber partitioned by the partition wall. It is possible to use a material, and it is possible to form a liquid crystal / polymer composite film having a uniform thickness in the compartment by applying the material in a highly accurate thickness very easily. Furthermore, since the liquid crystal emulsion in the non-pixel area (outside the necessary compartment) is excluded by the partition walls, there is an advantage that an expensive liquid crystal emulsion can be used only for the display section, and the application of the liquid crystal emulsion is easy. Therefore, it is possible to easily manufacture a liquid crystal display device even with an electrode substrate made of a polymer material or a film, which has not been realized though the possibility has been discussed in the past, and it is possible to significantly reduce the cost of the liquid crystal display device.

Further, since it is easy to color the liquid crystal / polymer composite film in each compartment with a dichroic dye having a different hue, arbitrary color display and multicolor display for each pattern can be easily performed. The reflective color display panel, which could not be represented by the TN type or STN type, can be supplied at low cost. In addition to static type display devices that display simple characters and patterns, high precision such as display devices for personal computers and word processors, color TVs, and other large-capacity monochromatic or color active matrix type display devices. The present invention can be similarly applied to a display device, and a large-area display device can be manufactured. Therefore, it is easy to increase the area, which is the greatest weak point in manufacturing a conventional liquid crystal display device. A wide range of measures, such as what can be achieved, are possible.

[0011]

The present invention will now be described in more detail with reference to the accompanying drawings, which show preferred embodiments. FIG. 1 is a diagram schematically illustrating the configuration and manufacturing process of a liquid crystal display device according to a preferred embodiment of the present invention. First, Fig. 1
As shown in (1), a transparent conductive film 2 such as an ITO film is formed on the surface of the transparent substrate 1, and on the transparent conductive film 2,
An electrically insulating partition wall 3 for partitioning the film surface into an arbitrary region is provided. As the transparent substrate 1 used in the present invention, for example, a glass plate, a quartz plate, a plate made of various synthetic resins, a film or the like is used.

The partition wall 3 is generally in the form of a plurality of parallel lines,
It is formed in a shape according to the purpose, such as a quadrilateral shape, a polygonal shape, a square shape, and an oblong shape. For example, in the case of displaying characters or patterns of an appropriate size, it may be sufficient to form a partition wall only on the outer periphery of the display unit individual unit, and if the partition wall interval is too large, it is within that area. May be further arbitrarily partitioned or column-shaped or plate-shaped independent columns may be provided, and the shape of the partition wall is not limited at all. However, in view of the coating operation, it is preferable that the partition walls of arbitrary independent shape are continuous. As a material for forming the partition wall, a general liquid photoresist, a dry photoresist, or the like can be used.
For example, a liquid photoresist is preferably used when forming barrier ribs having a height of 25 μm or less. For example, the liquid photoresist is applied in a pattern on a substrate using a spin coating method or a blade coating method. The partition wall can be formed by curing and developing. On the other hand, 25μ
It is desirable to use dry film photoresist in the case of forming barrier ribs having a height of m or more.

These partition walls may or may not be colored, but are colored so as not to transmit light so that they are different in color and do not mix with other colors in the adjacent compartments. Is preferred. The partition wall may be colored with a dye or a paint after the partition wall is formed, and in the case of a liquid photoresist, the dye is previously dissolved in the resist or the pigment or the like is dispersed in the resist, and the colored resist is used. You may create a partition with.
In addition, colored dry films are also available from the market, and colored partition walls can be easily produced by using these. The height of the partition walls formed as described above is preferably sequentially set in consideration of the volume reduction due to drying after the application of the liquid crystal emulsion. The liquid crystal / polymer composite film used in the liquid crystal display device of the present invention has a thickness of about 3 to 15 μm.
Since the solid content of the liquid crystal emulsion used is about 30 to 50% by weight, the height of the partition wall is generally about 6 to 50 μm. The width of the partition wall can be arbitrarily changed according to the shape of the display unit, but the interval between the partition walls forming the display unit is large, and when the partition wall is provided inside the display unit, it can withstand the squeegee pressure during application of the liquid crystal emulsion. The width needs to be wide, but if the width is too wide, the partition walls will be conspicuous and the appearance will be poor.
m.

Next, the liquid crystal emulsion 5 from which the air bubbles have been sufficiently removed is gently poured onto the surface of the substrate provided with the partition walls 3,
By flattening the surface with a squeegee 6 made of a soft metal or hard rubber and drying it, a liquid crystal / polymer composite film of the same hue is formed in each compartment. When liquid crystal / polymer composite films of different hues are formed in each compartment, as shown in FIG. 1 (2), the substrate surface provided with the partition walls 3 is
A mask 4 made of metal or the like having a plurality of openings synchronized with the partition wall is superposed, a liquid crystal emulsion 5 from which air bubbles are sufficiently removed is gently poured, and a squeegee 6 made of flexible metal or hard rubber is used to flatten the surface. By performing this operation for each liquid crystal emulsion having a different hue, a liquid crystal / polymer composite film having a different hue is formed in each compartment.

Any mask may be used as the mask. For example, when a metal mask is used,
The size of the opening of the metal mask is preferably synchronized with the width between the barrier ribs that fill the emulsion, but depending on the nature of the barrier ribs, the edge of the formed liquid crystal / polymer composite film may be raised. Therefore, in this case, the protrusion of the edge can be eliminated by making the opening of the mask slightly smaller than the size of the compartment partitioned by the partition wall. The liquid crystal emulsion used in the present invention may be a conventionally known liquid crystal emulsion method or a phase separation method, and is not particularly limited, but an emulsion method is preferable. As the matrix resin used in the emulsion method, PVA is preferably used, but gelatin, acrylic acid copolymer, water-soluble alkyd resin, or the like that can be dispersed or dissolved in water may be used.

The liquid crystal referred to in the present invention is an organic mixture which exhibits a liquid crystal state at around room temperature, and includes nematic liquid crystal, cholesteric liquid crystal and smectic liquid crystal. Among them, nematic liquid crystal or nematic liquid crystal to which cholesteric liquid crystal is added is preferable in view of characteristics. These liquid crystals may be microencapsulated. The reason why the liquid crystal is colored is also for the purpose of color display by coloring, but also for the purpose of enhancing the contrast of the displayed image by utilizing the difference in light absorption between when voltage is applied and when voltage is not applied. The dichroic dye used for coloring may be a guest-host type that is generally used in TN and STN type liquid crystal displays, or a dye for liquid crystal / polymer composite film. Good. However, it is preferable that the solubility in the liquid crystal is large, the solubility in the polymer is small, the dichroic ratio is large, and the absorption when a voltage is applied is small, but these characteristics are different depending on the liquid crystal used, and thus are determined for each liquid crystal. There is a need to. When the amount of the dye added is too large, the amount of the dye dissolved in the polymer increases, and color residue occurs when a voltage is applied, which is not preferable. Also, if the amount of the dye is too small, sufficient coloring cannot be achieved. Therefore, it is preferably used in the range of 0.1 to 5% by weight with respect to the liquid crystal used. Furthermore, it is preferable to dissolve it in a concentration of 1 to 3% by weight.

The amount of these liquid crystals used is such that the mixture ratio (weight ratio) of matrix resin / liquid crystal is 5/95 to 50 /.
When the amount of the liquid crystal is too small, not only is the transparency insufficient when the voltage is on, but also a large amount of voltage is required to bring the film into a transparent state, which is insufficient. On the other hand, if the amount of the liquid crystal used is too large, not only the scattering (turbidity) when the voltage is turned off becomes insufficient, but also the strength of the film decreases, which is not preferable. For example, as a method of dispersing the above liquid crystal in an aqueous polyvinyl alcohol solution, a mixing method using various stirring devices such as an ultrasonic disperser or a film emulsification method (Tadao Nakajima / Masakataka Shimizu, PHARMTECH JAPAN Vol. 4, No. 10, (19)
88))) and other dispersion methods are effective. The size of the liquid crystal emulsion particles depends on the dispersion method used, but generally the average particle size is preferably in the range of 0.5 to 7 μm, and more preferably in the range of 1 to 5 μm.

As shown in FIG. 1 (3), the liquid crystal emulsion filled in the compartment is dried at room temperature or at a temperature at which the emulsion is not affected, and the volume of the liquid crystal / polymer composite film 7 is reduced. Is obtained. Next, as shown by an arrow (4) in FIG. 1, another pattern mask having an opening aligned with the compartment which was not filled in the step (3) and a different color by a dichroic dye are used. By repeating the above-mentioned operation using the liquid crystal emulsion, the liquid crystal colored by the dichroic dyes of multiple colors /
A polymer composite film is formed on the transparent conductive film surface for each compartment.

The liquid crystal / polymer composite film 7 is formed as shown in FIG. 1 (5) by drying the liquid crystal emulsion with the necessary compartments filled with the liquid crystal emulsion. The volume of the / polymer composite film 7 is reduced by drying, and the surface of the liquid crystal / polymer composite film becomes lower than the top of the partition wall 3. As shown in FIG. 1 (5), this portion is filled with a paste-like conductive agent 8 with a squeegee 9. As the paste-like conductive agent, a commercially available silver paste or the like may be used, but one having a high content of an organic solvent or a thermosetting type liquid crystal / polymer composite film at the time of drying or curing May be destroyed. Therefore, a solventless type or a room temperature curing type pasty conductive agent is desirable. Next, as shown in FIG. 1 (6), the transparent conductive film surface of the counter substrate 11 on which the transparent conductive film 10 is formed is brought into close contact with the above-mentioned conductive agent surface, and the liquid crystal display device of the present invention is completed by contact-curing as it is. To do.

Another preferred embodiment shown in FIG. 2 is almost the same as the embodiment shown in FIG. 1, except that the liquid crystal / liquid crystal required in the compartment required in FIG.
After the polymer composite film is formed, as shown in FIG. 2 (5 '), an example is shown in which the partition wall 3 is peeled and removed by an arbitrary means such as tweezers. In this embodiment, as shown in FIG. 2 (6 ′), the transparent conductive film 1 is used without using the conductive agent paste.
The liquid crystal display device of the present invention is completed by bringing the transparent conductive film surface of the counter substrate 11 on which 0 is formed into close contact with the liquid crystal / polymer composite film surface, and then adhering and curing as it is. The partition wall material used here may be any resin that has a releasability with respect to the substrate and has a hardness that can withstand a squeegee pressure, and a protective film, a releasable solder masking agent, or the like is preferable.

[0021]

EXAMPLES Next, the present invention will be described more specifically with reference to examples. Example 1 A dry film photoresist (manufactured by San Nopco Ltd., F-1025, 25 μm thick) was laminated on the ITO side of glass with 100 mm × 100 mm × 1.1 mm ITO by using a laminating machine, and mask patterns were superposed. UV irradiation and development were carried out to form partition walls. A nematic liquid crystal (E-44, in which a dichroic dye (G-264, manufactured by Japan Photosensitive Dye Research Institute, Ltd.) was dissolved in the recesses between the obtained partition walls.
An emulsion obtained by dispersing Merck Co., Ltd. in a PVA aqueous solution was poured, and the surface was flattened using a squeegee for screen printing. After being dried at room temperature for one day and night, the recesses caused by the volume reduction were filled with a conductive agent colored white with titanium oxide with a squeegee and then air-dried to obtain a liquid crystal display device of the present invention. The display device obtained is blue opaque when no voltage is applied, but when a voltage is applied, the liquid crystal / polymer film becomes colorless and transparent, and a blue pattern is clearly displayed on a white background in a reflective type. It was

Example 2 A solder masking agent (TC-580-SN, manufactured by San Nopco Ltd.) was applied in a pattern on the ITO side of a glass with 100 mm × 100 mm × 1.1 mm ITO using a screen printing method, It was heated at 170 ° C. for 10 minutes to be cured (film thickness 20 μm). A nematic liquid crystal (E-44, manufactured by Merck & Co., Inc.) in which a dichroic dye (G-264, manufactured by Japan Photosensitive Dyes Laboratories Ltd.) was dissolved was dispersed in an aqueous PVA solution in the recesses between the obtained partition walls. The emulsion was poured and the surface was flattened using a squeegee for screen printing. After drying for one day at room temperature, the partition wall was peeled off with tweezers or the like to form a liquid crystal / polymer composite film. Next ITO
An ultraviolet curable resin (XNR-5493 manufactured by Nagase Ciba Co., Ltd.) was applied to the ITO side of the vapor-deposited PET film by a screen printing method so as to surround the liquid crystal / polymer composite film, and bubbles were introduced. The liquid crystal / polymer composite film surface obtained as described above was brought into contact with the film, thermocompression-bonded with a laminating machine, and irradiated with ultraviolet rays to fix the liquid crystal display device of the present invention. The obtained display device is blue opaque when no voltage is applied, but becomes colorless and transparent when a voltage is applied.

Example 3 A dry film photoresist (manufactured by San Nopco Ltd., F-1025, 25 μm thick) was laminated on the ITO side of a glass with 100 mm × 100 mm × 1.1 mm ITO by using a laminating machine to form a mask. The pattern was overlapped, irradiated with ultraviolet rays, and developed to form partition walls. A nematic liquid crystal (BL-90, in which a dichroic dye (M-137, manufactured by Mitsui Toatsu Dyes Co., Ltd.) was dissolved in the recesses between the obtained partition walls.
An emulsion obtained by dispersing Merck Co., Ltd.) in a PVA aqueous solution was poured over the metal mask, and the surface was flattened using a squeegee for screen printing. After drying at room temperature for several hours, an emulsion colored with a dichroic dye (S-421, manufactured by Mitsui Toatsu Dye Co., Ltd.) was similarly coated on another metal mask. After drying, an emulsion colored with a dichroic dye (S-426, manufactured by Mitsui Toatsu Dye Co., Ltd.) was coated on another metal mask in the same manner and dried at room temperature for 1 day and then the volume was reduced. The resulting recess was filled with a conductive agent with a squeegee and then air-dried to obtain a liquid crystal display device of the present invention. The obtained display device is opaque colored in red, blue and green when no voltage is applied, but when a voltage is applied to the whole, the whole becomes colorless and transparent, and the voltage of each pattern is changed. It was possible to display various color patterns by selecting application or non-application.

Example 4 A solder masking agent (TC-580-SN manufactured by San Nopco Co., Ltd.) was applied in a pattern on the ITO side of a glass with 100 mm × 100 mm × 1.1 mm ITO using a screen printing method, It was heated at 170 ° C. for 10 minutes to be cured (film thickness 20 μm). The dichroic dye (H-137, manufactured by Mitsui Toatsu Dyes Co., Ltd.)
A nematic liquid crystal (BL010, manufactured by Merck & Co., Inc.) in which P. a. Was dissolved was dispersed in a PVA aqueous solution, and an emulsion was poured over the metal mask and the surface was flattened using a squeegee for screen printing. After drying at room temperature for several hours, an emulsion colored with a dichroic dye (S-421, manufactured by Mitsui Toatsu Dye Co., Ltd.) was similarly coated on another metal mask. After drying, an emulsion colored with a dichroic dye (S-426, manufactured by Mitsui Toatsu Dye Co., Ltd.) was coated on another metal mask in the same manner and dried at room temperature for one day and then the partition wall was tweezers. Then, the film was peeled off to form a liquid crystal / polymer composite film. Then I
An ultraviolet curable resin (XNR-5493 manufactured by Nagase Ciba Co., Ltd.) was applied to the ITO side of the PET film on which TO was vapor-deposited by a screen printing method so as to surround the liquid crystal / polymer composite film, and bubbles were generated. The liquid crystal / polymer composite film surface obtained above was contacted so as not to enter and thermocompression-bonded with a laminating machine and irradiated with ultraviolet rays to be fixed to obtain a liquid crystal display device of the present invention. The obtained display device is opaque colored in red, blue and green when no voltage is applied, but when a voltage is applied to the whole, the whole becomes colorless and transparent, and the voltage of each pattern is changed. It was possible to display various color patterns by selecting application or non-application.

[0025]

[Effects] According to the present invention as described above, pattern coating is extremely easy, liquid crystal emulsion is not wasted, and liquid crystal / polymer composite film in a liquid crystal display device has excellent display characteristics in which no bubbles are contained. It is possible to provide a liquid crystal display device.

[0026]

[Brief description of drawings]

FIG. 1 is a diagram schematically illustrating a configuration of a liquid crystal display device according to a preferred embodiment of the present invention and a manufacturing process thereof.

FIG. 2 is a diagram schematically illustrating the configuration and manufacturing process of a liquid crystal display device according to another preferred embodiment of the present invention.

[Explanation of symbols]

 1: Transparent substrate 2, 10: Transparent conductive film 3: Partition wall 4: Mask 5: Liquid crystal emulsion 6, 9: Squeegee 7: Liquid crystal / polymer composite film 8: Conductive agent paste 11: Counter substrate

Front page continuation (72) Inventor Masayuki Ando 1-1-1 Ichigaya-Kagacho, Shinjuku-ku, Tokyo Dai Nippon Printing Co., Ltd.

Claims (7)

[Claims] 1. A polymer dispersion type liquid crystal display device comprising a liquid crystal / polymer composite film sandwiched between a pair of electrode substrates, at least one of which is transparent, wherein the liquid crystal / polymer composite film is formed on the electrode substrate surface. A polymer dispersed liquid crystal display device, which is formed in a plurality of compartments partitioned by partition walls made of the electrically insulating material and colored with a dichroic dye. 2. The polymer dispersed liquid crystal display device according to claim 1, wherein the liquid crystal / polymer composite film is colored with a dichroic dye having a different hue in each compartment. 3. The partition wall according to claim 1, wherein the partition wall is removed.
The polymer-dispersed liquid crystal display device according to item 1. 4. The partition wall according to claim 1, which is impermeable to light.
The polymer-dispersed liquid crystal display device described in 1. 5. A method of manufacturing a polymer dispersion type liquid crystal display device comprising a liquid crystal / polymer composite film sandwiched between a pair of electrode substrates, at least one of which is transparent, and a partition wall made of an electrically insulating material on the electrode substrate surface. To form multiple compartments,
A mask aligned with the plurality of compartments is superposed, and a polymer-dispersed liquid crystal emulsion colored with a dichroic dye is filled in the compartment through the opening of the mask and dried to liquid crystal / polymer in the compartment. A method for producing a liquid crystal / polymer composite film, comprising the step of forming a composite film. 6. The method for producing a polymer dispersed liquid crystal display device according to claim 5, wherein the partition is removed after forming the liquid crystal / polymer composite film in the compartment. 7. The method for manufacturing a polymer dispersed liquid crystal display device according to claim 5, wherein the size of the opening of the mask is smaller than the size of the compartment.