JPH0895069A - Liquid crystal display device and manufacturing method thereof. - Google Patents

Abstract

(57) [Abstract] [Purpose] A pair of substrates with electrodes 3 and 4, at least one of which is transparent, and a sealing portion 1 which is made by bonding polymer electrodes, which are sealing materials, with the electrode sides of the substrates facing each other. 1. A liquid crystal display device comprising an empty cell 10 formed from a liquid crystal display device and a composition containing a liquid crystal material filled in the empty cell, wherein the display surface of the liquid crystal display device has a rectangular shape, and an edge of a side portion of the substrate. The seal portion 1 formed on the substrate is the opening 1 at the four corners of the substrate.
According to the first aspect, it is possible to provide a liquid crystal panel having an injection port and a discharge port and having no uniform unevenness and no air bubbles mixed therein, and particularly to provide a uniform liquid crystal display device of polymer dispersed liquid crystal. [Structure] A seal pattern is provided by forming an opening 11 in a corner of a panel, and a weir portion 2 is provided so that the composition does not wrap around the outlet side even when the composition is injected, and a thermoplastic polymer is provided on the substrate surface. The coating film can be formed and the injection speed can be controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device and a method for manufacturing the same. More specifically, the present invention relates to a liquid crystal display element using a liquid crystal used for a display, an optical shutter and the like, and a manufacturing method thereof.

[0002]

2. Description of the Related Art Among liquid crystal elements, polymer / liquid crystal composites are used, which are advantageous in that they are easy to manufacture because they do not require alignment treatment and that they can display bright images because they do not require polarizing plates. In recent years, polymer dispersed liquid crystal devices have been attracting attention as displays.

Generally, a polymer-dispersed liquid crystal device is one in which a liquid crystal polymer composite in which liquid crystal is dispersed and held in a matrix made of a polymer material composition is sandwiched between a pair of substrates with electrodes. The refractive index of the ordinary light and the refractive index of the polymer matrix are substantially the same.
That is, the liquid crystal is aligned in the vicinity of the interface with the polymer matrix substantially parallel to the interface when no voltage is applied. When light perpendicular to the substrate enters in this state, the refractive index of the polymer matrix and the refractive index of the liquid crystal are different, so that the light is scattered at the interface. When a voltage is applied between the substrates, in the case of nematic liquid crystal having positive dielectric anisotropy, the liquid crystal molecules are aligned substantially perpendicular to the electrode surface, and the refractive index of the polymer matrix and the ordinary light of the liquid crystal Since the refractive index and the refractive index are almost the same, the light is transmitted without being scattered. An optical shutter function is possible by utilizing the above properties.

[0004]

However, since no polarizing plate is used, the contrast at 0N-OFF tends to be inferior to the display mode using a conventional polarizing plate. The contrast defined here means the ratio of the amount of light reaching the light receiving portion when the electric field is ON and the amount of light reaching the light receiving portion when the electric field is OFF, and the higher the contrast, the better the image quality obtained.

In addition, since a volatile monomer is generally used in the fabrication of this element, it is difficult to change the atmospheric pressure as in the vacuum injection such as in the polarizing plate use mode, and even if the atmospheric pressure injection is performed, the inside of the element is not manufactured. Many problems such as the remaining bubbles are left.

In general, since the composition is used for injecting a volatile monomer, it is difficult to inject by the conventional method of injecting a liquid crystal element, that is, a vacuum injection method due to volatilization of the composition. In particular, when at least injecting a mixture of a liquid crystal material and a polymer resin material as a composition, such as a polymer dispersed liquid crystal, it is difficult to manufacture due to pressure fluctuation due to problems such as volatilization of monomers, and bubbles are mixed or injected. It was easy for unevenness to occur. In addition, both normal pressure injection and the conventional methods were unstable such that bubbles might remain in the device.

Further, not only the polymer-dispersed liquid crystal but also the mode using a conventional polarizing plate has a problem of uneven injection, and a simple and low-cost manufacturing method is required. As described above, there are many problems in producing a polymer dispersion type liquid crystal element, particularly in injecting.

An object of the present invention is to solve these problems and provide a uniform liquid crystal display device and a method for manufacturing the same.

[0009]

In order to solve the above-mentioned problems, the liquid crystal display element of the present invention has a pair of substrates with electrodes, at least one of which is transparent, and a pair of substrates with electrodes facing each other with a sealing material. A liquid crystal display device comprising a polymer resin material bonded at a seal portion to form an empty cell having a gap between substrates, and a composition containing a liquid crystal material being injected into the empty cell. The display surface is rectangular, and two or more openings having no sealing material are provided in the sealing portion formed along the edge of each side of the substrate.

As described above, basically, by forming the seal pattern as in the constitution of the present invention, the above-mentioned problems are solved by the normal pressure injection. Further, the present invention forms a thermoplastic polymer having a shape memory effect on a substrate, and by utilizing the uniaxially stretchable-non-stretchable conversion characteristic of the thermoplastic polymer having a shape memory effect, it is speedy. Safe work becomes possible.

In the liquid crystal display device having the above structure, it is preferable that the openings are formed at the four corners of the substrate. Further, in the liquid crystal display device having the above-mentioned structure, at least the seal portions are respectively provided on two sides perpendicular to the injection direction,
It is preferable that the opening is formed by one or more portions where there is no sealing material.

In the liquid crystal display device having the above structure, it is preferable that the seal portion is formed of a polymer resin in a dotted line shape and the opening is formed. The method for manufacturing a liquid crystal display element of the present invention comprises a pair of electrode-attached substrates, at least one of which is transparent, and the electrodes are opposed to each other to form a gap between the substrates with a polymer resin material, which is a sealing material. Form empty cells such as inlets and outlets in the parts where there is no material so that the composition does not flow from the inlet side to the opposite side, especially around the outlets, at both ends of the side where the inlets are provided. As described above, the weir portion is provided and the composition containing the liquid crystal material is stored in the portion provided with the injection port and the portion surrounded by the weir portion, or surrounded by the portion provided with the injection port and the weir portion. It is characterized in that the filled portion is dipped in a container holding the composition, and the composition is continuously supplied so as not to disappear until the injection is completed.

In addition, in the liquid crystal display device having the above structure, the empty cell is provided with a weir portion at both ends of the side where the injection port is provided so as to prevent the composition from flowing from the injection side to the opposite side, particularly to the discharge port. It is preferable that

According to the method of manufacturing a liquid crystal display element of the present invention, a pair of substrates with electrodes, at least one of which is transparent, are made to face each other with electrodes, and a gap is formed between the substrates with a polymer resin material as a sealing material. In addition, openings such as inlets and outlets are provided to form empty cells, and weirs are provided at both ends of the side where the inlets are provided so that the composition does not flow from the inlet side to the opposite side, particularly around the outlet. And the sealing portion is formed by forming an opening at four corners of the substrate, or by forming an opening at least at one or more portions without sealing material on two sides perpendicular to the injection direction. To form or
It is formed of a polymer resin in a dotted line shape, and the dam portion is provided so as to be positioned above the injection side with respect to two sides in the direction perpendicular to the injection portion, and the empty cell is immersed in a composition reservoir containing a liquid crystal material. It is characterized in that it is injected into the cell. It is characterized by being configured in this way.

In the manufacturing method of the above construction, the dam portion is provided above two sides in the direction perpendicular to the injection portion above the injection side, and the empty cell is dipped in the composition reservoir containing the liquid crystal material for injection. Preferably.

In the liquid crystal display device having the above structure, the dam portion is provided above the injection side with respect to the two sides in the direction perpendicular to the injection portion, and is immersed in the composition reservoir containing the liquid crystal material. Is preferably injected into the empty cell.

Further, in the manufacturing method of the above constitution, the composition reservoir is equipped with an infrared sensor, a temperature sensor or an optical sensor, and the liquid level of the composition reservoir is injected into an empty cell. It is preferable to control the dipping position of the empty cell so that it is always located in the position, and to provide the weir portion at the seal end portion in the direction perpendicular to the side where the discharge port is provided close to the discharge port side and inject the composition.

In the manufacturing method of the above structure, it is preferable to inject the composition after protecting the terminal portion of the electrode of the substrate and the outer surface of the substrate. In addition, in the manufacturing method of the above-described structure, one corner opening of the empty cell is used as an injection port, and a weir portion made of a polymer resin material is provided for two adjacent corner portions with respect to this one corner, and the injection side is provided. It is preferable to place it below the weir, and to immerse it in a composition reservoir containing a liquid crystal material.

In addition, in the liquid crystal display device having the above-mentioned structure, an injection port is formed at an opening of one corner of the empty cell, and a weir portion made of a polymer resin material is provided for two adjacent corner portions of the one corner. Is preferably provided and the composition containing the liquid crystal material is filled in the empty cell.

In the method for producing a liquid crystal display device of the present invention, a thermoplastic polymer layer having a shape memory effect is formed on at least one electrode-side substrate surface of a pair of substrates with electrodes, at least one of which is transparent, and a composition is injected. In the direction in which the thermoplastic polymer layer is rubbed, the polymer is uniaxially stretched, the composition is injected through the injection port between the substrates to form an element, and after the injection is completed, the element is removed from the element. The composition was sealed with a sealing resin so that the composition did not leak, and the element was heated for a certain period of time at a temperature higher than the glass transition temperature (Tg point) of the thermoplastic polymer to release the uniaxial stretching of the thermoplastic polymer, thereby leaving a non-stretched state. After that, the temperature is lowered, and the device is manufactured.

Further, in the liquid crystal display device of the present invention, a thermoplastic polymer layer having a shape memory effect is formed on at least one electrode-side substrate surface of a pair of substrates with electrodes, at least one of which is transparent. Uniaxially stretched,
The surface is rubbed in the direction in which the composition is injected, the composition is injected between the substrates, the injection port is sealed with a sealing resin, and then the thermoplastic polymer has a glass transition temperature ( It is heated for a certain time above the Tg point),
It is characterized in that it is in a non-stretched state after the uniaxial stretching is released.

In the liquid crystal display device having the above structure, it is preferable that the glass transition temperature (Tg point) of the thermoplastic polymer having a shape memory effect is higher than the operating environment temperature of the device.

In the constitution of the liquid crystal display device, a polymer having a glass transition temperature (Tg point) or a softening point not higher than the operating environment temperature of the device is provided on at least one electrode-side substrate of a pair of transparent substrates with electrodes. Is preferably formed into a coating film.

In the liquid crystal display device having the above structure, it is preferable that the thermoplastic polymer having the shape memory effect is polyurethane. Further, in the liquid crystal display device having the above structure, a polymer having a glass transition temperature (Tg point) or a softening point not higher than the operating environment temperature of the device is formed as a coating film on at least one electrode side substrate of the electrode substrate with the panel substrate. , The glass transition temperature (Tg of the thermoplastic polymer
It is preferable that the element is heated for a certain period of time as described above to release the uniaxial stretching of the thermoplastic polymer and perform a treatment to bring it into a non-stretched state.

In the liquid crystal display device having the above structure, it is preferable that the composition to be injected into the empty panel is a mixture of a liquid crystal material and a polymer material. Further, in the configuration of the manufacturing method, it is preferable that the composition and the substrate to be injected are heated to a constant temperature before the injection.

Further, in the constitution of the manufacturing method, it is preferable that the injection is performed under normal pressure.

[0027]

In the liquid crystal display element of the present invention, since the display surface of the liquid crystal display element is rectangular and the seal portion formed at the end of each side of the substrate has two or more openings in which the seal material is cut,
It is possible to inject at a normal pressure and to easily inject a material such as a composition such as a volatile monomer into an empty cell without air bubbles or uneven injection, and it is possible to obtain a uniform element. That is, since pressure fluctuations such as depressurization as in the past are not used, it is possible to obtain a liquid crystal display device that can be injected without affecting the composition and can perform uniform display at a low cost with a simple operation.

In the above structure, since the openings are provided at the four corners of the substrate, it is possible to obtain a uniform element having no unevenness and no remaining bubbles. In the above configuration, at least on two sides where the seal portion is perpendicular to the injection direction,
Since the opening is formed by one or more portions where the sealing material is absent, it is possible to obtain a uniform element having no unevenness and no remaining bubbles.

In the above structure, since the seal portion is formed of a polymer resin in a dotted line shape, it is possible to obtain a uniform element having no unevenness and no remaining bubbles. The present invention
A weir is provided at both ends of the side of the empty cell where the injection port is provided from the injection side to the opposite side, in particular so as not to go around the discharge port, and the portion where the injection port is provided and the weir (stopper) ) Is filled with a composition containing a liquid crystal material, or the portion surrounded by the injection port and the weir portion is immersed in a container holding the composition. , The composition is continuously fed until the injection is complete. With this configuration, even under normal pressure, there is no bubble mixing or uneven injection of materials such as composition, and it is possible to inject cells into empty cells more easily and quickly than before, and it is possible to supply devices of uniform and excellent quality. Is. That is, since pressure fluctuations such as depressurization operation that have been used up to now are not used, it is possible to perform injection without affecting the composition and reduce the manufacturing cost.

According to the structure of the above-mentioned element, the empty cell is provided at both ends of the side where the injection port is provided with weir portions from the injection side to the opposite side, particularly so as not to go around to the discharge port. Therefore, it is possible to obtain an element of uniform quality without inclusion of bubbles and uneven injection.

According to the present invention, weirs are formed at both ends of the side where the injection port is provided, from the injection side to the opposite side, in particular so as not to go around the discharge port, and the sealing portion is formed. The openings are provided at four corners of the substrate, or the openings are formed by at least one or more portions having no sealing material on each of two sides perpendicular to the injection direction, or a polymer is formed in a dotted line shape. It is injected by immersing an empty cell in a composition reservoir that stores a composition containing a liquid crystal material that is made of resin, so it is possible to easily and quickly inject materials such as the composition into the empty cell without leaving bubbles. It is possible to manufacture an element of excellent uniform quality at low cost.

Further, according to the manufacturing method of the above construction, the dam portion is provided so as to be positioned above the injection side with respect to the two sides in the direction perpendicular to the injection portion, and the empty cell is immersed in the composition reservoir containing the liquid crystal material. Since it is injected into the empty cell by the method, a material such as a composition can be injected more easily and rapidly without leaving bubbles in the empty cell, and an element of excellent uniform quality can be manufactured at low cost.

Further, according to the liquid crystal display device having the above structure, the dam portion is provided above the injection side with respect to the two sides in the direction perpendicular to the injection portion, and is immersed in the composition reservoir containing the liquid crystal material. Since the liquid crystal material is injected into the empty cell, it is possible to obtain a low-cost element having excellent and uniform quality with no residual air bubbles.

The composition reservoir is equipped with an infrared sensor, a temperature sensor or an optical sensor, and the empty cell is always positioned so that the height of the liquid surface of the composition reservoir is injected into the empty cell. The dipping position is controlled, and the weir portion is provided at the seal end portion in the direction perpendicular to the side where the discharge port is provided near the discharge port side and the composition is injected. Quality devices can be easily manufactured at low cost.

Further, in the above manufacturing method, since the composition is injected after protecting the terminal portion of the electrode of the substrate and the outer surface of the substrate, it is possible to uniformly inject the electrode without causing contact failure and leaving no bubbles. A uniform high quality device can be easily manufactured at low cost.

Further, in the structure of the above-mentioned manufacturing method, one corner opening of the empty cell is used as an injection port, and a weir portion made of a polymer resin material is provided at two corners adjacent to the one corner.
The injection side is located below the weir, and the liquid is immersed in the composition reservoir containing the liquid crystal material for injection, so that the injection speed can be increased and uniform injection can be performed without leaving any bubbles, and a device of uniform quality can be easily manufactured at low cost. Can be made with.

Further, in the structure of the display element, an injection port is formed at an opening of one corner of the empty cell, and a weir portion made of a polymer resin material is provided for two adjacent corner portions with respect to the one corner. Is provided and the composition containing the liquid crystal material is injected into the empty cell, so that it is possible to obtain a uniform, high-quality and low-cost element with no remaining bubbles or unevenness.

In the production method of the present invention, a thermoplastic polymer layer having a shape memory effect is formed on at least one electrode-side substrate surface of a pair of substrates with electrodes, at least one of which is transparent, and the composition is injected in the direction. In the above, rubbing the thermoplastic polymer layer, uniaxially stretching, to form a device by injecting the composition from the injection port between the substrates, after the injection is completed, so that the composition does not leak from the device, It is sealed with a sealing resin, and the glass transition temperature (Tg
(Point) The element is heated for a certain period of time to release the uniaxial stretching of the thermoplastic polymer, and after the non-stretched state is prepared, the temperature is lowered, so that the injection rate can be increased and uniform injection can be achieved without leaving bubbles. In addition, it is possible to easily fabricate an element of uniform quality, which can improve the retention rate of the polymer liquid crystal and has excellent voltage retention characteristics that can be driven at a low voltage, at low cost.

In the display element of the present invention, a thermoplastic polymer layer having a shape memory effect is formed on at least one electrode-side substrate surface of a pair of electrode-attached substrates, at least one of which is transparent, and the thermoplastic polymer layer is uniaxially stretched. The surface is rubbed in the direction in which the composition is injected, the composition is injected between the substrates, the injection port is sealed with a sealing resin, then the thermoplastic polymer is After being heated to a temperature higher than the glass transition temperature (Tg point) for a certain period of time, the uniaxial stretching is released and it is in a non-stretched state. in this way,
By forming a thermoplastic polymer layer having a shape memory effect on the surface of the substrate, it is possible to speedily inject a material such as a composition and evenly inject without leaving bubbles, and the retention rate of the polymer-dispersed liquid crystal can be improved. It is possible to easily obtain a device of uniform quality in which the driving voltage is lowered, at low cost.

Further, in the constitution of the display element, since the glass transition temperature (Tg point) of the thermoplastic polymer having the shape memory effect is higher than the operating environment temperature of the element, the injection of the material such as the composition can be carried out quickly. It is possible to carry out uniformly without leaving air bubbles, further improve the retention rate of the polymer-dispersed liquid crystal, and reduce the driving voltage to obtain a device of uniform quality easily and at low cost.

In the structure of the display element, a polymer having a glass transition temperature (Tg point) or a softening point not higher than the operating environment temperature of the element is provided on at least one electrode-side substrate of a pair of transparent substrates with electrodes. A coating film is formed. Thus, by using the thermoplastic polymer, the material such as the composition can be injected speedily and uniformly without leaving bubbles, and the retention rate of the polymer-dispersed liquid crystal can be improved, and the driving voltage is lowered. A device of uniform quality can be obtained easily and at low cost.

Further, in the constitution of the display element, since the thermoplastic polymer having the shape memory effect is polyurethane, the use of the thermoplastic polymer allows the material such as the composition to be injected speedily and uniformly without bubbles. By further forming a thermoplastic polymer layer on the surface of the substrate, it is possible to improve the retention rate of the polymer-dispersed liquid crystal, and the driving voltage is lowered, which is excellent in voltage retention characteristics.
A device of uniform quality can be obtained easily and at low cost.

Further, in the constitution of the display element, the panel substrate is coated on at least one electrode-side substrate of the electrode-attached substrate with a polymer having a glass transition temperature (Tg point) or a softening point equal to or lower than the operating environment temperature of the element. Since the formed element is heated above the glass transition temperature (Tg point) of the thermoplastic polymer for a certain period of time, the uniaxial stretching of the thermoplastic polymer is released, and the thermoplastic polymer is in an unstretched state. The injection can be carried out speedily and uniformly without leaving any bubbles. Furthermore, by forming the thermoplastic polymer layer on the substrate surface, the retention rate of the polymer-dispersed liquid crystal can be improved, and the driving voltage can be lowered. Quality devices can be obtained easily and at low cost.

Further, in the constitution of the display element, since the composition to be injected into the empty cell is composed of a mixture of a liquid crystal material and a polymer material, the material such as the composition can be injected speedily and without air bubbles remaining uniformly. Injected product is obtained, and by further forming a thermoplastic polymer layer on the substrate surface, the retention rate of the polymer dispersed liquid crystal can be improved, and
It is possible to easily and inexpensively obtain a device of uniform quality with a reduced driving voltage.

Further, in the constitution of the above-mentioned manufacturing method, when the composition is injected, the composition to be injected and the substrate are heated after being heated to a constant temperature and then the composition is injected. It has excellent retention characteristics, can be injected at high speed, can be injected uniformly without leaving bubbles, and an element of uniform quality can be easily manufactured at low cost.

Further, in the constitution of the above-mentioned manufacturing method, since the injection is carried out under normal pressure, the retention rate of the polymer-dispersed liquid crystal can be improved, the voltage holding characteristic can be improved, the injection speed can be increased, and the bubbles can be uniformly left without remaining. It can be injected, and a device of uniform quality can be easily manufactured at low cost.

As described above, according to the liquid crystal display element of the present invention and the method for manufacturing the same, there is no bubble inclusion or injection unevenness.
A uniform panel can be manufactured. Moreover, since the liquid crystal and the composition containing the polymerizable material and the like can be easily injected under normal pressure, the cost can be significantly reduced.

Further, by using the thermoplastic polymer of the present invention, injection of a material such as a composition can be speedily and safely performed. Further, according to the liquid crystal display element of the present invention, it is possible to improve the retention of the polymer-dispersed liquid crystal and reduce the driving voltage. Further, the method for producing a liquid crystal display device of the present invention is particularly effective for producing a polymer-dispersed liquid crystal, and a composition containing at least a liquid crystal and a photopolymerizable material is mixed, and a compatible mixture is easily prepared. Can be injected into the polymer and can be prepared by a photopolymerization phase separation method in which a polymer material and a liquid crystal are separated by light (it is also possible to perform phase separation by using a thermopolymerizable material). The photopolymerizable composition is composed of a polymerizable organic compound such as a prepolymer or a monomer and a photoinitiator, and a polymer compound, an inorganic filler or an organic additive may be mixed to adjust the composition. Further, a thermal polymerization initiator may be mixed. Among the compounds having a vinyl group are suitable as the prepolymer and the monomer, acrylic compounds are preferable. For example, t-butyl acrylate, 2
-Ethylhexyl acrylate, 2-methoxyethyl acrylate, 2-phenoxyethyl acrylate, cyclohexyl acrylate, trimethoxypropane triacrylate, neopentyl glycol diacrylate,
Monomers such as 1,6-hexanediol diacrylate and trimethylolpropane triacrylate, and trade names: MANDA, TC-110, HX-220, HX-
Polyfunctional acrylates such as 620 manufactured by Nippon Kayaku Co., Ltd., and commercially available prepolymers such as polyester acrylate, epoxy acrylate, polyurethane acrylate, and polyether acrylate can be used alone or in combination. Suitable photoinitiators include benzoin methyl ether, benzoin isopropyl ether, benzoin isobutyl ether, benzophenone, benzylidene methyl ketal, 2,2-diethoxyacetophenone, and 2-hydroxy-2-methyl-1-phenylpropan-1-one. ing. In addition to the above radically polymerizable composition, it is also possible to use a cationically polymerizable epoxy resin composition. The liquid crystal material used in the present invention has dielectric anisotropy capable of controlling the director direction by voltage and has refractive index anisotropy, and composition system and anisotropy may be positive or negative. . It is also noted that it is possible to mix additives such as dyes in the liquid crystal material.

[0049]

EXAMPLES Specific examples of the present invention will be described below. However, the present invention is not limited to these examples.

Example 1 2-Ethylhexyl acrylate (manufactured by Nacalai Tesque, Inc.) 17.6 wt as a monomer
%, Viscoat # 3700 as prepolymer (Osaka Organic Chemical Industry Co., Ltd.) 1.93 wt% Darocur1 as photo-curing initiator
173 (manufactured by Merck) 0.07 wt% photopolymerizable material,
TL205 as liquid crystal [NI point = 87 ℃, ne = 1.744, no =
1.527] (manufactured by Merck Japan Ltd.) 80.4 wt% was mixed to obtain a composition.

As shown in FIG. 1, a pair of substrates with electrodes 3,
Epoxy sealing material, struct bond (manufactured by Mitsui Toatsu Co., Ltd.) with a seal pattern with no seals for the four corners (corners) with a 13.0 μm spacer between the substrates with the electrode surfaces of 4 facing each other. Then, the cells were pasted together to form an empty cell.

To form an empty cell, specifically, as shown in FIG. 1, rectangular substrates of different sizes and different sizes are made to face each other. The size of the large substrate 3 side was 59 mm × 70 mm, and the size of the small substrate 4 side was 49 mm × 65 mm. 1.5 mm from the short-axis side (short side) substrate ends 4b and 4c of the small substrate 4, respectively, and from the long-axis side (long side) substrate ends 4a and 4a
The longitudinal seal portion 1a is formed from the position of 0.5 mm. Similarly, the seal on the minor axis side is 1.5 mm from the major axis side (long side) substrate edge 4a of the small substrate 4, and the minor axis side substrate edge 4
Seal part 1b in the minor axis direction from a position 0.5 mm from b, 4c
To form. The seal width was 0.4 mm. This seal part 1
The substrates on which a and 1b were formed were heated at 90 ° C. for 10 minutes, then the substrates were attached to each other, pressed by a vacuum packing machine, and then heated at 150 ° C. for 2 hours. Thereby, an empty cell was obtained.

For this empty cell, as shown in FIG.
At the short side (short side) portion 4b of the injection side (A), Loctite 352A (manufactured by Nippon Loctite Co., Ltd.) is slightly higher than the small substrate 3 height on the large substrate 3 to the substrate end 3b, and the line width
It is formed to have a thickness of about 1 mm and is irradiated with ultraviolet rays (350 nm) at 55 mW / cm ² for 90 seconds to be cured to form dam portions 2 and 2.

Subsequently, the composition 6 is supplied to and stored in the injection section (composition supply section) 5 surrounded by the dam sections 2 and 2 until the injection is completed. At the time of this implantation, the temperature of the substrate and composition was kept at 25 ° C.

After the composition has been injected over the panel, 25
The device was obtained by irradiation with ultraviolet rays (30 mW / cm ² , 3 minutes) in an environment kept at ℃. In this way, the obtained device was a uniform panel (the brightness in the plane was uniform) as a whole, and there was no unevenness and no bubbles remained.

The weirs 2 and 2 were not limited to Loctite 352A, and the same results were obtained with other UV curable resins and thermosetting resins. The sealing material is not limited to the struct bond, and similar results were obtained with other resins.

The sizes of the substrates 3 and 4 are not limited to those described above, but the size of the large substrate 3 side is 100 mm × 150 mm and the size of the small substrate 4 side is 90 mm × 145 mm. However, similarly, it was possible to obtain an element having no unevenness and no remaining bubbles.

Comparative Example 1 The composition was volatilized when vacuum injection was attempted instead of the seal pattern in which the four corners were cut as in Example 1.

When the normal pressure injection is attempted without providing the weir and the seal pattern for cutting the four corners, the composition wraps around on the opposite side to the injection side and the discharge port is closed, leaving some bubbles. It resulted in a poor yield that would be lost. (Embodiment 2) As shown in FIG. 2, seal patterns 1a, 1a, 1b and 1c, which are almost the same as those of Embodiment 1, and dam portions 2 and 2 are formed.
To form.

Regarding the empty cell formation, as in the first embodiment, specifically, as shown in FIG. 2, substrates of different sizes and different sizes are made to face each other. The size of the large board 3 side is 59mm x 70
The size on the small substrate 4 side was 49 mm × 65 mm. From the substrate ends 4b and 4c on the minor axis side of the small substrate 4.
The seal portions 1a, 1a in the long axis direction are formed from a position of 0.5 mm from the long axis side substrate end 4a of the large substrate 3 by 0.5 mm. Similarly, the seal on the minor axis side is also from the major axis side substrate end 4b of the small substrate 4.
Seal portions 1b and 1c in the minor axis direction are formed from a position of 2.5 mm and 0.5 mm from the minor axis side substrate end 4a. As shown in Fig. 2, the seals at the four corners (corners) are located 1mm away from the long and short axis seal ends (opening 1mm).
d, 1d, 1d were formed. The seal width was 0.4 mm. The substrates 3 and 4 on which the sealing material was formed were heated at 90 ° C. for 10 minutes, then the substrates were bonded to each other, pressed by a vacuum packing machine, and then heated at 150 ° C. for 2 hours. Thereby, an empty cell was obtained.

The weirs 2 and 2 were formed in the same manner as in Example 1.
A polymer-dispersed liquid crystal was produced by the same injection method as in Example 1. As a result of this example, it was possible to obtain a uniform panel (element) as in Example 1. Further, this seal pattern had better panel cell thickness uniformity in the empty cell state than that of Example 1, and there were almost no interference fringes.

Further, the size of the substrate, the position of the dam, etc. are not limited to those described above as in the first embodiment, but the size of the large substrate is 100 mm × 150 mm, and the size of the small substrate is Even if you use a 90mm x 145mm,
It was possible to obtain an element with no residual air bubbles.

(Embodiment 3) As shown in FIG. 3, the seal pattern was formed in the same manner as in Embodiment 2, and the dam portion was also provided as shown in FIG.

Regarding the empty cell formation, as in the first embodiment, specifically, as shown in FIG. 3, the substrates 3 having different sizes and different sizes are used.
One of each of 4 is opposed to each other. The size of the large substrate 3 side was 59 mm × 70 mm, and the size of the small substrate 4 side was 49 mm × 65 mm. A seal portion 1a in the major axis direction is formed from a position of 1.5 mm from the minor axis substrate ends 4b and 4c of the small substrate 4 and 0.5 mm from the major axis substrate end 4a. Similarly, the seal on the minor axis side is 1.5 mm from the major axis side substrate end 4a of the small substrate 4 and 0.5 mm from the minor axis side substrate ends 4b and 4c, respectively, and the seal portion 1b, 1 in the minor axis direction is provided.
c are each formed. In addition, at the four corners (corner), the dot-shaped seals 1e, 1e, 1e, 1e, 1e, 1e, 1e, 1e, 1e having a diameter of 0.5 mm are provided at positions 0.5 mm from the short-axis and long-axis substrate ends 4a, 4b of the small substrate 4.
1e was formed as shown in FIG. The seal width was 0.4 mm. The substrate on which this sealing material was formed was heated at 90 ° C. for 10 minutes, then the substrates 3 and 4 were bonded together, pressed by a vacuum packing machine, and then heated at 150 ° C. for 2 hours. Thereby, an empty cell was obtained.

The dam portions 2 and 2 were formed in the same manner as in Example 1 from the small substrate end to the large substrate end as shown in FIG. As a result of this example, the injection speed was slightly higher than in Example 2, and the injection was completed, and a uniform panel could be obtained.

Also, the size of the substrate is not limited to the above, but the size of the large substrate 3 side is 100 mm × 150 mm and the size of the small substrate 4 side is 90 mm × 145 mm. Similarly, it was possible to obtain an element having no unevenness and no remaining bubbles.

(Embodiment 4) As in Embodiment 1, the seal pattern is set to have no seals at the four corners as shown in FIG. 4, and one seal opening portion is provided on each short side, and the weir portion is also formed. Providing as shown in FIG. 4, the same production as in Example 1 was performed.

As for the empty cell formation, as in the first embodiment, specifically, as shown in FIG. 4, substrates of different sizes and different sizes are made to face each other. The size of the large board 3 side is 59mm x 70
The size on the small substrate 4 side was 49 mm × 65 mm. 1.5mm from the short axis side substrate edge 4b of the small substrate 4
Then, the seal portion 1a in the major axis direction is formed from a position 0.5 mm from the major axis side substrate end 4a. Similarly, the seals 1b and 1c on the minor axis side are 1.5 mm away from the major axis side substrate end 4a of the small substrate 4 and 0.5 mm from the minor axis side substrate ends 4b and 4c. To form. Short shaft seal 1b, 1c
An opening 11 of 1 mm was provided at the center of as shown in FIG. The seal width was 0.4 mm. The substrate on which this sealing material is formed is heated at 90 ° C for 10 minutes, then the substrates are bonded together and pressed by a vacuum packing machine, then at 150 ° C.
Heated for 2 hours. Thereby, an empty cell was obtained.

The weirs 2 and 2 were formed in the same manner as in Example 1.
A polymer-dispersed liquid crystal was produced by the same injection method as in Example 1. As a result, the injection speed was higher than in Example 3, and the injection was completed, and a uniform panel could be obtained.

(Embodiment 5) As in Embodiment 4, the seal pattern is such that no seals are provided at the four corners as shown in FIG.
b, 1c with three seal openings 11, 11, 11 respectively
The weirs 2 and 2 were also provided as shown in FIG.

As a result of this embodiment, as compared with the fourth embodiment,
The injection speed was high and the injection was completed, and a uniform panel could be obtained. Also, the size of the substrate is not limited to the one described above, as in the case described in Example 1, but the size of the large substrate is 300 mm × 350 mm, and the size of the small substrate is 290 mm.
Similarly, even if the one having a size of 345 mm was used, an element having no unevenness and no residual air bubbles could be obtained.

(Embodiment 6) Compared with Embodiment 5, the short axis and the long axis are made opposite to each other, and as shown in FIG. 6, the seal patterns are provided on the long axis sides 1a, 1a respectively. 11 are provided at three places with 1 mm opening, and the dam portions 2 and 2 are also provided at both ends of the major axis (side) in a state of being along the line extending the edge of the short side, and the same production as in Example 5 is performed. went.

As a result of this embodiment, as compared with the fifth embodiment,
The injection speed was high and the injection was completed, and a uniform panel could be obtained. The size of the substrate is not limited to the one described above as described in the first embodiment, but the size on the large substrate 3 side is 300 m.
The size on the small board 4 side is 290mm × 345mm.
In the same manner, even if the above-mentioned one was used, the injection was completed faster than in Example 5, and it was possible to obtain an element having no unevenness and no bubble remaining.

(Example 7) A seal pattern was formed as shown in FIG. 7, and weirs 2 and 2 were also provided as shown in FIG. 7, and the same production as in Example 5 was performed.

As a result, it was possible to perform the injection at the same injection rate as in Example 6 and obtain a uniform panel. Also, the seal portions 1a, 1b, 1c could be produced without unevenness.

As in Example 6, the size of the large substrate is 300 m.
Similarly, even if a small substrate having a size of 290 mm × 345 mm and having a size of m × 350 mm is used, the injection is completed as quickly as in Example 6, and an element having no unevenness and no remaining bubbles is obtained. I was able to.

(Embodiment 8) Weir portions 2 and 2 in Embodiment 1
At a position 7 mm away from the end of the injection-side small substrate 4 and extending in the direction perpendicular to the long axis from the small substrate end 4b to the large substrate end 3a as shown in FIG.

Unlike the method of Example 1, the injection method was also carried out by setting the empty cell 10 in the composition reservoir 7 so that the liquid surface of the composition 6 was located below the dam portions 2 and 2. At this time, the temperature of the empty cell 10 and the composition 6 of the composition reservoir 7 is 2
It was kept at 5 ° C.

As a result, similar to Example 1, a uniform element having no unevenness and no residual air bubbles was obtained. Also, the injection was completed a little faster than in the case of Example 1. (Embodiment 9) Similar to Embodiment 8, the weirs 2, 2 in Embodiment 2 are placed at a position 7 mm away from the injection-side small substrate end 4a in the direction perpendicular to the long axis as shown in FIG. It was provided by extending from 4a to the large substrate end 3a.

Similarly to Example 2, the injection method was also carried out by installing an empty cell 10 in the composition reservoir 7 such that the liquid surface of the composition was below the dam portions 2 and 2. .
At this time, the temperature of the empty cell 10 and the composition 6 of the composition reservoir 7 was kept at 25 ° C.

As a result of this example, similar to Example 2, a uniform element having no unevenness and no residual air bubbles was obtained. Also, the injection was completed slightly faster than in Example 2. (Embodiment 10) Similar to Embodiment 8, the weirs 2 and 2 in Embodiment 3 are placed at a position 7 mm away from the injection-side small substrate end 4b in a direction perpendicular to the major axis as shown in FIG. From the large substrate.

As in Example 8 or 9, the injection method was also different from that in Example 3, and the empty cell 10 was placed in the composition reservoir 7 so that the liquid surface of the composition was located below the dam portions 2 and 2. It went by installing. At this time, the empty cell 10 and the composition reservoir 7
The composition was maintained at a temperature of 25 ° C.

As a result of this example, similar to Example 3, a uniform element having no unevenness and no residual air bubbles was obtained. In addition, Example 3
The injection was completed slightly faster than at. (Embodiment 11) As in Embodiment 8, the positions of the weirs 2 and 2 in Embodiment 4 are separated by 7 mm from the injection-side small substrate end 4b in the direction perpendicular to the long axis as shown in FIG. 4a
To the large substrate end 3a.

As in the case of Example 8 or 9 or 10, the injection method was also different from that of Example 4 so that the liquid level of the composition in the composition reservoir 7 was below the dams 2 and 2. 10
It was done by setting up. At this time, the temperature of the empty cell 10 and the composition 6 of the composition reservoir 7 was kept at 25 ° C.

As a result of this example, similar to Example 4, a uniform element having no unevenness and no residual air bubbles was obtained. Example 4
The injection was completed slightly faster than at. (Embodiment 12) As in Embodiment 8, the positions of the dam portions 2 and 2 in Embodiment 5 are separated by 7 mm from the injection-side small substrate end 4b in the direction perpendicular to the long axis as shown in FIG. 4a
To the large substrate end 3a.

Like Example 8 or 9 or 10 or 11, the injection method was also different from that of Example 5 so that the liquid level of the composition was lower than the dam portions 2 and 2 with respect to the composition reservoir. This was done by installing the cell 10. At this time, the temperature of the empty cell 10 and the composition 6 of the composition reservoir 7 was kept at 25 ° C.

As a result of this example, as in the case of Example 5, a uniform element having no unevenness and no remaining bubbles was obtained. Example 5
The injection was completed slightly faster than at. Then, it was confirmed that even if the dam portion 2 was not provided, it was possible to obtain a similar uniform element by using the injection method as shown in Example 12 having the seal pattern as shown in FIG. did it.

(Embodiment 13) Weir portion 2 in Embodiment 6,
The position 2 is provided at a position 10 mm away from the injection-side small substrate end 4b in the direction perpendicular to the short axis extending from the small substrate end 4a to the large substrate end 3a as shown in FIG.

The injection method was also different from that of Example 6 in that the empty cell 10 was installed in the composition reservoir 6 so that the liquid surface of the composition was below the dam portions 2 and 2. At this time, the temperature of the empty cell 10 and the composition 6 of the composition reservoir 7 is 2
It was kept at 5 ° C.

As a result of this example, similar to Example 6, a uniform element having no unevenness and no residual air bubbles was obtained. In addition, Example 6
The injection was completed slightly faster than at. (Embodiment 14) The dam portions 2 and 2 in Embodiment 1 are provided so as to extend diagonally from the small substrate end 4a to the large substrate end 3a as shown in FIG.

The injection method is also as follows.
Soaked in the composition, the liquid surface of the composition is at the injection side angle, and the small substrate angle is 3 m.
m It was carried out by setting the empty cell 10 so that it is below the liquid surface. At this time, the temperature of the empty cell 10 and the composition 6 of the composition reservoir 7 was kept at 25 ° C.

As a result, similar to Example 1, a uniform element having no unevenness and no residual air bubbles was obtained. (Example 15) As shown in FIG. 15, the positions of the dam portions 2 and 2 in Example 2 are diagonally changed from the corner of the small substrate end to the large substrate end 3a.
It was extended to 3a.

As for the injection method, one corner without the weirs 2 and 2 was immersed in the composition reservoir 7, and the empty cell 10 was placed so that the composition surface was at the injection side corner and the small substrate angle was 3 mm below the liquid surface. It went by installing. At this time, the temperature of the empty cell 10 and the composition 6 of the composition reservoir 7 was kept at 25 ° C.

As a result of this example, as in the case of Example 2, a uniform element having no unevenness and no remaining bubbles was obtained. (Example 16) Two positions of the dam portion 2 in Example 3 were provided diagonally extending from the small substrate end 4a to the large substrate end 3a as shown in FIG.

As for the injection method, one corner without the weirs 2 and 2 was immersed in the composition reservoir 7, and the empty cell 10 was placed so that the composition surface was at the injection side corner and the small substrate angle was 3 mm below the liquid surface. It went by installing. At this time, the temperature of the empty cell and the composition 6 of the composition reservoir 7 was kept at 25 ° C.

As a result of this example, as in the case of Example 3, a uniform element having no unevenness and no remaining bubbles was obtained. (Embodiment 17) The positions of the dam portions 2 and 2 in Embodiment 1 are changed as shown in FIG.

Weirs 2, 2 are provided extending vertically from the small substrate end 4a to the large substrate end 3a at a position 2 mm below the long axis seal end on the opposite side to the injection side. As for the empty cell formation, as in the first embodiment, specifically, as shown in FIG. 4, substrates of different sizes and different sizes are made to face each other.

In the injection method, first, the composition liquid level was 2 mm above the lower end of the small substrate (injection side (A)) 4b, and the composition height advancing in the cell was 4 mm above the lower end of the small substrate (injection side) 4b. At the position, the infrared sensor 8 controlled the depth of immersion in the composition reservoir 7 of the empty cell so that the distance between the liquid surface of the composition reservoir 7 and the height of the advanced composition was kept at 2 mm. At this time, the electrode terminal of the empty cell is covered with masking tape (N-38
0) (manufactured by Nitto Denko Corporation). The temperature of the composition of the panel 10 and the composition reservoir 7 was kept at 25 ° C.

As a result, similar to Example 1, a uniform element having no unevenness and no remaining bubbles was obtained. The injection also entered at a constant rate in the injection direction. Almost no unevenness was detected even when measured with a luminance meter.

Further, the protection of the electrode terminal portion is not limited to the one described above, and the strip mask # 5 can be obtained by using the masking tape Scotch 202 (manufactured by Sumitomo 3M Limited).
Even if 03 □ -SH (made by Asahi Chemical Laboratory Co., Ltd.) is used,
It was good that the results were similar.

(Embodiment 18) As for Embodiments 2 to 5,
As a result of studying in the same manner as in Example 17, similar results were obtained. A uniform element having no unevenness and no remaining bubbles was obtained.

In particular, in the present study for Example 5, the size of the substrate is not limited to the one described above as described in Example 1, but the size of the large substrate is 300 mm × 350 mm, and the size of the small substrate is Similarly, even if the size of 290 mm x 345 mm was used, the injection was completed, and it was possible to obtain an element with no unevenness and no residual air bubbles.

(Embodiment 19) In comparison with Embodiment 6, Embodiment 1
As in 7, the injection was performed as shown in FIG. As a result, a uniform element having no unevenness and no remaining bubbles was obtained.

Also in this case, the size on the large substrate side is 30
It consists of 0 mm x 350 mm, and the size of the small board side is 290 mm x 345 mm
In the same way, even if you use the one, the injection is completed and there is no unevenness,
It was possible to obtain an element with no residual air bubbles.

Example 20 A thermoplastic polymer having a shape memory effect is used for the surface of a substrate. As the thermoplastic polymer, the polyurethane proposed in JP-A-2-116102 is used. An example of the structural formula of this urethane-based polymer is shown in the following formula (Formula 1).

[0106]

[Chemical 1]

Polyurethane is partially crystallized, and when it exceeds the glass transition point (Tg), it becomes a rubber elastic state due to the micro Brownian motion of the molecular chain. When an external force is applied in this state, the molecular chains are easily oriented in the direction of the external force and the shape also changes. When cooled to a temperature below Tg in this state,
The Micro Brownian motion of the molecular chain is frozen and becomes a plastic state, the deformation is fixed, and the shape is memorized. After that, by reheating above Tg, the Micro Brownian motion of the molecular chain is started, the orientation of the molecular chain is released, and the original shape is restored.

A polyurethane film having the above function is formed into a coating film and rubbed. An external force is applied by rubbing, and the molecular chains are uniaxially stretched in the rubbing direction. Next, by reheating the substrate to a temperature not lower than the Tg of the polyurethane, the orientation of the molecular chains of the polyurethane is released, and the polyurethane becomes in a non-stretched state. Thereby, the alignment of liquid crystal molecules can be easily controlled.

As the large and small substrates shown in Examples 1 to 19, the following substrates were used. Polyurethane solution with a solid content of 6% by weight (eg MS55
00 (Tg point: 55 ° C.): manufactured by Mitsubishi Heavy Industries, Ltd. was transferred to the electrode side of both large and small substrates by letterpress printing, and baked at 80 ° C. for 1 hour to form a polyurethane layer (alignment film). The thickness of the polyurethane layer was about 80 nm. Next, the surface of the polyurethane layer is rayon crossed and the direction of injection of the composition (1
Direction). The substrate thus obtained was used.

Preparation of polymer-dispersed liquid crystals was also carried out in Examples 1 to 1.
Unlike 9, the procedure was as follows. Further, the injection time was very fast, and the injection time could be shortened to 1/3 of that of each of Examples 1 to 19.

After the injection, the periphery of the panel is sealed with a polymer resin. This time, a mask was provided so that the element would not be exposed to ultraviolet rays, UV resin was applied to the periphery of the panel, and the composition was sealed. (For example, Loctite 352A (manufactured by Nippon Loctite Co., Ltd.) is cured by irradiation with UV (350 nm) 55 mW / cm ² for 90 seconds.) Then, the panel is covered with a mask and is made into 60
Heated at ℃ for 1 hour. The uniaxial stretching effect once imparted to the polyurethane alignment film by rubbing was completely lost by heating at Tg or higher, and changed to a non-stretched state. In addition, by heating at 60 ° C for 1 hour, the remaining unevenness in the panel, which was partially left, was completely eliminated. Subsequently, it was cooled to 25 ° C at a rate of 15 ° C per second. After the panel temperature reached 25 ° C., the mask was removed and ultraviolet irradiation was performed to obtain a polymer dispersed liquid crystal.

As a result, a uniform element having no unevenness and no remaining bubbles was obtained. Further, it was possible to obtain a device having a high injection speed and a voltage holding characteristic better than those of the devices shown in Examples 1 to 19.

Example 21 The polyurethane solution of Example 20 having a Tg point in the vicinity of the operating environment temperature of the device is used (for example, MS3500 (Tg point: 35 ° C.): manufactured by Mitsubishi Heavy Industries, Ltd.). Example 20 was carried out as in Example 20.
Heating at 40 ℃ to lose the rubbing effect in
It was heated. A polymer dispersion type liquid crystal device was obtained under the same conditions except for the above.

As a result, similarly, a uniform element having no unevenness and no remaining bubbles was obtained. In addition, it was possible to obtain a device having a high injection speed, good voltage holding characteristics, and low driving voltage. (Example 22) The compositions of Examples 1 to 21 were changed as follows.

As monomers, 2-ethylhexyl acrylate (manufactured by Nacalai Tesque, Inc.) 3.0 wt%, 2-hydroxyethyl acrylate (manufactured by Nacalai Tesque, Inc.)
KAYARAD MANDA (manufactured by Nippon Kayaku Co., Ltd.), which is 9.0 wt% and neopentyl glycol diacrylate, 2.48 w
t%, KAYARAD R-551 (manufactured by Nippon Kayaku Co., Ltd.) which is EO-modified bisphenol A diacrylate as an oligomer
A photopolymerizable material consisting of 5.36 wt% and Irgacure 651 (manufactured by Ciba-Geigy Co., Ltd.), which is benzyl dimethyl ketal as a photo-curing initiator, and a chlorine-based liquid crystal TL205 [NI point = 87 ° C., as a liquid crystal]. ne =
1.744, no = 1.527] (Merck Japan KK) 8
A composition was prepared by mixing 0.0 wt%.

As a result, similar to Examples 1 to 21, uniform elements having no unevenness and no remaining bubbles were obtained. Example 23 The composition of Example 22 was changed as follows.

2-Ethylhexyl acrylate (manufactured by Nacalai Tesque, Inc.) 17.55w as a prepolymer material
t%, 4-hydroxybutyl acrylate Acryester 4HBA (manufactured by Mitsubishi Rayon Co., Ltd.) 0.44w
t%, Acryester SA (manufactured by Mitsubishi Rayon Co., Ltd.) which is 2-succinoloyloxyethyl methacrylate.
20wt%, KAYARAD TPGDA (Nippon Kayaku Co., Ltd.) 1.1
1 wt%, a photopolymerizable material consisting of 0.20 wt% of Darocur-1173 (manufactured by Merck) which is 2-hydroxy-2-methyl-1-phenylpropan-1-one as a photo-curing initiator, and TL205 [NI point as a liquid crystal. = 87 ℃, ne
= 1.744, no = 1.527] (Merck Japan KK) 8
0.5 wt% was mixed to obtain a composition.

As a result, as in Example 22, a uniform element having no unevenness and no remaining bubbles was obtained. The materials such as the compositions in Examples 1 to 23 shown above are not limited to these, and many other materials are also used. In Examples 1 to 23, the ultraviolet intensity is not limited to the indicated intensity, but is 3 to 160 mW / cm ²
In, it was confirmed that a product having the characteristics of the present invention was obtained. Further, the cell thickness of the device is not limited to 13.0 μm.

Further, in the above embodiments, the case of the polymer-dispersed liquid crystal is shown, but the invention is not limited to the polymer-dispersed liquid crystal, and it can be applied to other liquid crystal display elements and their manufacture. This is a condition for obtaining a uniform and uniform liquid crystal display element.

[0120]

According to the liquid crystal display element and the method for manufacturing the same of the present invention, the material such as the composition can be easily injected into the panel even at normal pressure without causing air bubbles and uneven injection, and a uniform panel can be supplied. It is possible. In addition, since pressure fluctuations such as depressurization operation as before are not used, the composition can be injected without any influence.

In particular, when at least a mixture of a liquid crystal material and a polymer resin material is injected as a composition, such as polymer dispersed liquid crystal, it is difficult to prepare due to pressure fluctuation due to problems such as volatilization of monomers, and bubbles Although mixing and uneven injection were likely to occur, this problem can be solved by the manufacturing method of the present invention.

Further, by using the thermoplastic polymer of the present invention, the material such as the composition can be injected quickly and without any problem. Further, the retention rate can be improved by forming the thermoplastic polymer layer on the surface of the substrate. According to the manufacturing method, it is possible to easily inject a material such as a composition into a panel even under normal pressure without causing air bubbles to be mixed or uneven injection, and it is possible to uniformly supply the panel. In addition, since pressure fluctuations such as depressurization operation as before are not used, the composition can be injected without any influence.

In particular, when at least a mixture of a liquid crystal material and a polymer resin material is injected as a composition, such as a polymer dispersed liquid crystal, it is difficult to produce due to pressure fluctuation due to problems such as volatilization of monomers, and bubbles Although mixing and uneven injection were likely to occur, this problem can be solved by the manufacturing method of the present invention.

Further, by using the thermoplastic polymer of the present invention, the material such as the composition can be injected speedily and without any problem. Further, the retention rate can be improved by forming the thermoplastic polymer layer on the surface of the substrate.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an empty cell before injecting a composition of a first embodiment of a display device of the present invention.

FIG. 2 is a schematic plan view showing an empty cell before injection of the composition of the second embodiment of the display element of the present invention.

FIG. 3 is a schematic plan view showing an empty cell before injection of the composition of the third embodiment of the display element of the present invention.

FIG. 4 is a schematic plan view showing an empty cell before injecting a composition of a fourth embodiment of the display element of the present invention.

FIG. 5 is a schematic plan view showing an empty cell before injecting the composition of the fifth embodiment of the display element of the present invention.

FIG. 6 is a schematic plan view showing an empty cell before injection of the composition of the sixth embodiment of the display element of the present invention.

FIG. 7 is a schematic plan view showing an empty cell before injection of the composition of the seventh embodiment of the display element of the present invention.

FIG. 8 is a schematic view of device production at the time of injecting a composition, which explains a first embodiment of the method for producing a display device of the present invention.

FIG. 9 is a schematic view of device production at the time of injecting a composition, which explains a second embodiment of the method for producing a display device of the present invention.

FIG. 10 is a schematic view of device production at the time of injecting a composition, which explains a third embodiment of the method for producing a display device of the present invention.

FIG. 11 is a schematic view of device production at the time of injecting a composition, which explains a fourth embodiment of the method for producing a display device of the present invention.

FIG. 12 is a schematic view of device production at the time of injecting a composition, which illustrates a fifth embodiment of the method for producing a display device of the present invention.

FIG. 13 is a schematic view of device production at the time of injecting a composition, which illustrates a sixth embodiment of the method for producing a display device of the present invention.

FIG. 14 is a schematic view of element production at the time of injecting a composition, which explains a seventh embodiment of the method for producing a display element of the present invention.

FIG. 15 is a schematic view of element production at the time of injecting a composition for explaining an eighth example of the method for producing a display element of the present invention.

FIG. 16 is a schematic view of element production at the time of injecting a composition for explaining a ninth example of the method for producing a display element of the present invention.

FIG. 17 is a schematic view of element production at the time of injecting a composition, which explains a tenth embodiment of the method for producing a display element of the present invention.

FIG. 18 is a schematic view for manufacturing an element at the time of injecting a composition, which illustrates an eleventh embodiment of the method for manufacturing a display element of the present invention.

[Explanation of symbols]

 1a, 1b, 1c, 1d, 1e, 1f Seal part 2 Dam part (stopper) 3 Large substrate 4 Small substrate 5 Composition supply part 6 Composition 7 Composition reservoir 8 Sensor 10 Empty cell

Claims (22)

[Claims] 1. An empty cell having a gap between substrates, wherein a pair of substrates with electrodes, at least one of which is transparent, are bonded to each other with a polymer resin material, which is a sealing material, facing each other with their electrode sides facing each other at a sealing portion. And a liquid crystal display device obtained by injecting a composition containing a liquid crystal material into the empty cell,
The display surface of the liquid crystal display element is rectangular, and the seal portion formed along the edge of each side of the substrate has no sealing material.
A liquid crystal display device having at least one opening. 2. The liquid crystal display element according to claim 1, wherein the openings are formed at four corners of the substrate. It is preferable. 3. The liquid crystal display element according to claim 1, wherein the seal portion has an opening formed on at least one portion on each of two sides perpendicular to the injection direction, the portion having no seal material. 4. The liquid crystal display element according to claim 1, wherein the seal portion is formed of a polymer resin in a dotted line shape and has an opening. 5. A pair of substrates with electrodes, at least one of which is transparent, are made to adhere to each other with the electrode sides facing each other, forming a gap between the substrates with a polymer resin material as a sealing material, and pouring at a portion without the sealing material. An empty cell is formed with openings such as an inlet and an outlet, and weirs are provided at both ends of the side where the inlet is provided so that the composition does not flow from the injection side to the opposite side, especially around the outlet. , A composition containing a liquid crystal material is stored in a portion surrounded by the injection port and the weir portion, or the composition provided in the portion provided with the injection port and the weir portion is A method for producing a liquid crystal display element, which comprises immersing a product in a container holding the product and continuously supplying the composition so that the composition is not lost until the injection is completed. 6. The weir section is provided at both ends of the side where the empty cell is provided with the injection port, from the injection side to the opposite side, in particular so as not to go around the discharge port. 2. The liquid crystal display device according to 2, 3, or 4. 7. A pair of electrodes-equipped substrates, at least one of which is transparent, are made to adhere to each other with the electrode sides facing each other with a gap between the substrates made of a polymeric resin material as a sealing material.
At least an inlet and an outlet are provided to form an empty cell, and a weir is formed at both ends of the side where the inlet is provided so that the composition does not flow from the injection side to the opposite side, particularly to the outlet. And at the four corners of the substrate in the seal part,
A composition containing a liquid crystal material, which is formed by forming an opening, or by forming an opening at least at one or more portions where there is no seal material on each of two sides perpendicular to the injection direction, or by forming a polymer resin in a dotted line shape. A method for producing a liquid crystal display element, which comprises injecting by immersing an empty cell in a composition reservoir for storing the composition. 8. The weir portion is provided so as to be positioned above the injection side with respect to two sides in the direction perpendicular to the injection portion, and the empty cell is injected into the empty cell by dipping it in a composition reservoir containing a liquid crystal material. Item 5. A method of manufacturing a liquid crystal display device according to item 7. 9. A weir is provided above two sides in a direction perpendicular to the injection part, above the injection side, and is immersed in a composition reservoir containing the liquid crystal material to inject the liquid crystal material into an empty cell. 7. The liquid crystal display device according to claim 6. 10. The composition reservoir is equipped with an infrared sensor, a temperature sensor, or an optical sensor so that the height of the liquid surface of the composition reservoir is always positioned at the height at which it is injected into the empty cell. 9. The liquid crystal display element according to claim 7, wherein the dipping position of the empty cell is controlled, and the composition is injected by providing a weir portion at a seal end portion in the direction perpendicular to the side where the discharge port is provided close to the discharge port side. Manufacturing method. 11. The method of manufacturing a liquid crystal display device according to claim 7, wherein the composition is injected after protecting the terminal portion of the electrode of the substrate and the outer surface of the substrate. 12. An opening in one corner of an empty panel is used as an injection port, and a weir portion made of a polymer resin material is provided for two adjacent corner portions with respect to the one corner, and the weir is provided on the injection side. 11. The method for producing a liquid crystal display device according to claim 7, wherein the liquid crystal display device is placed below the part and is dipped in a composition reservoir containing a liquid crystal material and injected. 13. An injection port is formed in an opening of one corner of an empty cell, and a weir portion made of a polymer resin material is provided for two adjacent corner portions with respect to the one corner. The liquid crystal display device according to claim 1, wherein the composition containing the compound is injected into an empty cell. 14. A thermoplastic polymer layer having a shape memory effect is formed on at least one electrode-side substrate surface of a pair of substrates with electrodes, at least one of which is transparent, and the thermoplastic polymer layer is formed in the direction in which the composition is injected. The polymer layer is rubbed, the polymer layer is uniaxially stretched, and the composition is injected between the substrates through an injection port to form an element, and after the injection is completed, the composition is prevented from leaking from the element. , The glass transition temperature of the thermoplastic polymer (Tg
Point) A method for producing a liquid crystal display element, which is characterized in that the element is heated for a certain period of time as described above, the uniaxial stretching of the thermoplastic polymer is released, the state becomes a non-stretched state, and then the temperature is lowered. 15. A thermoplastic polymer layer having a shape memory effect is formed on the surface of at least one electrode-side substrate of a pair of substrates with electrodes, at least one of which is transparent, and the thermoplastic polymer layer is uniaxially stretched, and the surfaces thereof are stretched. Is a composition that is rubbed in the direction in which the composition is injected, the composition is injected between the substrates, the injection port is sealed with a sealing resin, and then the thermoplastic polymer has a glass transition temperature (Tg point).
A liquid crystal display device, characterized in that it is heated for a certain period of time as described above, and is uniaxially stretched to be in a non-stretched state. 16. The liquid crystal display device according to claim 15, wherein the glass transition temperature (Tg point) of the thermoplastic polymer having a shape memory effect is higher than the operating environment temperature of the device. 17. A polymer having a glass transition temperature (Tg point) or a softening point not higher than the operating environment temperature of the device is formed on at least one electrode-side substrate of a pair of substrates with electrodes, at least one of which is transparent. The liquid crystal display device according to claim 1, 2, 3, or 4. 18. The liquid crystal display device according to claim 15, wherein the thermoplastic polymer having a shape memory effect is polyurethane. 19. The thermoplastic polymer, wherein a polymer having a glass transition temperature (Tg point) or a softening point not higher than the operating environment temperature of the device is formed on at least one electrode-side substrate of the substrate with an electrode. Glass transition temperature (Tg
5. The liquid crystal display element according to claim 1, 2, 3 or 4, wherein the element is heated for a certain period of time as described above and the uniaxial stretching of the thermoplastic polymer is released to bring it into a non-stretched state. 20. The composition injected into the empty cell comprises a mixture of a liquid crystal material and a polymer material.
15. The liquid crystal display device according to item 15. 21. The liquid crystal display device according to claim 5, wherein the composition to be injected and the substrate are heated to a constant temperature before the composition is injected. Production method. 22. The method of manufacturing a liquid crystal display element according to claim 5, wherein the injection is performed under normal pressure.