JP2001242473A - Method for manufacturing liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method satiopactory in productivity for a liquid crystal display device having high display quality level which will not generate the defect caused by the dispersion in the amount of liquid crystal supplied and film thickness. SOLUTION: The liquid crystal display element is manufactured including the stops where liquid crystal is applied in the shape of a film on one substrate in the same shape as the outer shape of a liquid crystal layer at completion of enclosure, the weight of the applied liquid crystal is measured, and when the prescribed weight is not reached, after separating the liquid crystal of the shortage into or more drops, dropping the liquid crystal equally within the limits of the outer shape of the liquid crystal layer at the completion of enclosure and compensating the quantity of the liquid crystal, the one substrate is stuck with the other substrate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a liquid crystal display device used for a notebook computer or a display.

[0002]

2. Description of the Related Art The prior art will be described below using an active matrix type liquid crystal display device as an example. FIG. 6 is a schematic sectional view showing the structure of the liquid crystal display element 6. The liquid crystal display element 6 has a pair of substrates 1 and 2 facing each other, the two substrates 1 and 2 are bonded together by a sealant 4, and the area between the two substrates 1 and 2 is indicated by oblique lines. Liquid crystal 3 is enclosed. The space between the substrates 1 and 2 in which the liquid crystal is sealed (hereinafter referred to as a cell gap) is maintained by a large number of spacers 5 distributed between the substrates 1 and 2. The two substrates 1 and 2 have a TFT (Thin Film Tr) not shown.
ansister) element, a transparent electrode, a color filter, an alignment film, and the like.

As a method of filling liquid crystal between substrates of a liquid crystal display element, there is a method called a conventional vacuum injection method.
FIG. 7 is a schematic diagram for explaining a conventional vacuum injection method. In the vacuum injection method, first, spacers are sprayed on one or the other substrate in advance, and the two substrates are sealed with a frame-shaped sealing material 22.
Paste together. At this time, the sealing material 22 is provided with an opening serving as a liquid crystal injection port 23. afterwards,
The sealing material 22 is cured to manufacture the empty cell 21 in which the liquid crystal 24 is not sealed.

Next, an empty cell 21 and a liquid crystal 24 indicated by oblique lines are shown.
Is placed in the vacuum chamber 20. The inside of the vacuum chamber 20 is evacuated, the inside of the empty cell 21 is evacuated, and the liquid crystal 24 is defoamed. After sufficiently evacuating, the inlet 23 of the empty cell 21 is immersed in the liquid crystal 24, and the inside of the vacuum chamber 20 is returned to the atmospheric pressure. Then, empty cell 2
The liquid crystal 24 permeates into the cell 21 from the injection port 23 due to the pressure difference between the inside and outside. After the liquid crystal 24 is filled in the cell 21, the cell 21 is taken out, the injection port 23 is sealed with, for example, an ultraviolet curing resin, and the injection of the liquid crystal 24 is completed.

In the vacuum injection method, after the inside of the empty cell 21 is evacuated, the liquid crystal 24 is brought into contact with the injection port 23, and the outside of the empty cell 21 is returned to the atmospheric pressure. The injection is performed by the pressure difference. However, it is impossible to make the inside of the empty cell 21 completely at 0 atm, that is, a state in which no gas molecules are present, by exhausting only from the inlet 23, and there is no gas molecule adsorbed on the inner surface of the empty cell 21. I do. For this reason, the liquid crystal 24 is
As the gas is injected into the cell 1, the pressure in the cell 21 increases, and the pressure difference between the inside and outside of the cell 21 eventually disappears, and bubbles at atmospheric pressure remain in the cell 21.

In particular, in recent monitor liquid crystal display devices having a diagonal size of 15 inches or more, the volume of gas remaining in the injected liquid crystal is large, which may adversely affect the display of the liquid crystal display device. ing. Further, the cell gap between the two substrates is on the order of μm, and the thickness tends to be further reduced. It takes a very long time to evacuate an empty cell having such a narrow cell gap by exhausting only from the inlet. Similarly, it takes time to fill the liquid crystal into the empty cell, and in the above-mentioned 15-inch diagonal liquid crystal display element, it takes about 10 hours from the start of the exhaustion of the empty cell to the completion of the liquid crystal encapsulation. I need.

As another method of manufacturing a liquid crystal display element, a method in which a liquid crystal is supplied to a substrate in advance, and then two substrates are bonded and the liquid crystal is sealed is disclosed in Japanese Patent Application Laid-Open No. 63-109413 and Japanese Patent Publication No. 8-20627. No. 6,086,045.

FIG. 8 is a process chart for explaining the manufacturing method disclosed in Japanese Patent Application Laid-Open No. 63-109413. First, in FIG. 8A, a sealing material 4 and a spacer 5 are provided on a substrate 2.

In FIG. 8B, under a reduced pressure, a required amount of liquid crystal 3 is uniformly dropped on the entire area of the substrate 2 inside the sealing material 4. In FIG. 8C, under reduced pressure, the substrate 1
Are overlapped so as to be in contact with the sealing material 4. In FIG. 8D, the sealing material 4 is cured, and the enclosing of the liquid crystal 3 is completed.

FIG. 9 is a process chart for explaining the manufacturing method disclosed in Japanese Patent Publication No. Hei 8-20627. FIG.
1A, a predetermined amount of liquid crystal 3 is placed inside a sealing material 4 provided on a substrate 2. FIG. At this time, the liquid crystal 3 is supplied so as to be smaller than the outer shape of the liquid crystal layer at the time of completion of the encapsulation and thicker than the sealing material 4.

In FIG. 9B, the substrate 1 and the substrate 2 are overlapped. At this time, the substrate 1 is in contact with the liquid crystal 3, but there is a gap between the substrate 1 and the sealing material 4.

In FIG. 9C, the two substrates 1 and 2 are weighted under reduced pressure, the liquid crystal 3 is spread, and the substrate 1 and the sealing material 4 are brought into contact and bonded.

In the liquid crystal sealing method shown in FIGS. 8 and 9,
Since the substrate 2 and the substrate 1 on which the liquid crystal 3 is dropped are evacuated before they are bonded to each other, compared with the above-described vacuum injection method, the pressure is reduced by two.
The time required to evacuate the cell surrounded by the substrates 1 and 2 and the sealing material 4 is greatly reduced. Further, in the liquid crystal sealing method, since the liquid crystal 3 is supplied onto the substrate 2, the liquid crystal display element can be manufactured in a short time without injecting the liquid crystal which requires a long time in the vacuum injection method.

Further, by making the volume of the supply amount of the liquid crystal 3 equal to the volume of the space in the cell surrounded by the two substrates 1 and 2 and the sealing material 4, the cell is filled with the liquid crystal 3; It is possible to prevent a space from being formed in the cell. Further, since the pressure is reduced in a state where the inner surface of the cell is open, gas molecules adsorbed on the inner surface are also effectively removed. Therefore, it is difficult for gas to remain in the liquid crystal 3 after being filled.

[0015]

In the method shown in FIGS. 8 and 9 in which the liquid crystal 3 is supplied to the substrate 2 in advance, and the two substrates 1 and 2 are bonded together and the liquid crystal 3 is sealed.
The amount and distribution of the liquid crystal 3 supplied on the substrate 2 is very important. If the amount of the liquid crystal 3 is larger than the space in the cell determined by the prescribed cell gap and the sealing material 4, the liquid crystal 3 spreads by laminating and swirls the sealing material 4 to cause liquid crystal leakage. There is a problem that it becomes thicker.

Conversely, if the amount of the liquid crystal 3 is small, a reduced pressure space is left between the sealing material 4 and the liquid crystal 3, and air enters from the outside under atmospheric pressure and bubbles remain in the liquid crystal 3. There is a problem that the cell gap becomes thinner than a predetermined value.

Further, if the distribution of the liquid crystal 3 is not uniform, it causes display unevenness. The non-uniform distribution of the liquid crystal 3
When an attempt is made to correct the pressure by pressing the substrates 1 and 2, the liquid crystal 3 flows, and if this flow is strong, the spacers 5 that maintain the cell gap flow, and the cell gap is not kept uniform, resulting in poor production. turn into. In addition,
Variations in the cell gap and movement of the spacers 5 due to the flow of the liquid crystal 3 cause a decrease in the display quality of the liquid crystal display element 6 even if it does not cause a defect in production.

According to the method disclosed in JP-A-63-109413 shown in FIG. 8, an amount of liquid crystal 3 corresponding to a space in a cell surrounded by two substrates 1 and 2 and a sealing material 4 is formed.
It is stated that the liquid is uniformly dropped on the entire area of the substrate 2 inside the sealing material 4. However, this method has a problem that even if the ejection amount of one drop is set in advance, an error occurs in the amount of liquid crystal actually ejected onto the substrate 2 and the amount of liquid crystal dropped on the substrate 2 varies. Have. The uncured sealing material 4
It is difficult to supply the liquid crystal 3 uniformly to the vicinity of the inside of the liquid crystal.

According to the method disclosed in Japanese Patent Publication No. Hei 8-20627 shown in FIG. 9, a precisely weighed liquid crystal is supplied to the substrate 2. However, it is difficult to supply the entire weighed liquid crystal to the substrate 2. This causes an error in the amount of liquid crystal actually supplied to the substrate 2.

Further, in this method, the liquid crystal 3 is used as the sealing material 4.
Since the liquid crystal 3 is provided slightly thicker than the sealing material 4 so as to prevent the liquid crystal 3 from spreading too fast, it is necessary to spread the liquid crystal 3 after the two substrates 1 and 2 are overlapped. There is a possibility that the spacer 5 may move.

Further, in this method, the liquid crystal 3 is supplied by a method of dropping as an aggregate of minute points, a screen method or a blade method. However, when the liquid crystal 3 is dropped as an aggregate of minute points,
In order to prevent the movement of the spacer 5 due to the flow of the liquid crystal 3, it is necessary to make one droplet extremely small, and there is a problem that it takes a long time to drop a huge number of points. In addition, the aforementioned Japanese Patent Application Laid-Open No. 63-109413
In the same manner as in the method disclosed in Japanese Patent Application Laid-Open No. H10-209, there is a problem that even if the ejection amount of one droplet is set in advance, the amount of liquid crystal dropped on the substrate 2 varies.

In the application by the screen method and the blade method, even if the necessary amount of liquid crystal is measured in advance, the entire amount cannot be applied onto the substrate 2 and it is difficult to accurately control the amount of liquid crystal.

In the manufacturing method disclosed in Japanese Patent Application Laid-Open No. 60-75817, the liquid crystal is applied by an offset printing method. However, as in the above-described screen method and blade method, it is possible to supply a specified amount of liquid crystal. Have difficulty.

It is an object of the present invention to provide a method of manufacturing a liquid crystal display device having high display quality, which does not cause a defect caused by a variation in a supply amount and a film thickness of a liquid crystal, and has high productivity.

[0025]

SUMMARY OF THE INVENTION The present invention relates to a liquid crystal display element manufactured by supplying liquid crystal to one substrate, bonding the liquid crystal to the other substrate, and sealing the liquid crystal between substrates sandwiching a frame-shaped sealing material. A method of manufacturing a liquid crystal display element, comprising measuring a weight of a liquid crystal supplied to one substrate in a manufacturing method.

According to the present invention, since the weight of the liquid crystal supplied to the one substrate is measured, it is possible to confirm whether or not a required amount of liquid crystal is supplied. , Bubbles and uneven cell gap can be prevented. Further, in the manufacturing method according to the present invention, the liquid crystal is supplied before the two substrates are bonded, so that the liquid crystal display element can be manufactured in a short time, and the productivity is good.

Further, the present invention is characterized in that the weight of the liquid crystal supplied to one of the substrates is compared with a specified weight, and if the weight does not reach the specified weight, an insufficient liquid crystal is added.

According to the present invention, the shortage of the amount of liquid crystal is eliminated by additional supply. Therefore, even when the amount of supplied liquid crystal is smaller than the specified amount, the amount of liquid crystal can be set to the specified amount. Insufficient air bubbles and uneven cell gaps can be prevented.

The present invention also provides a method of applying a liquid crystal to one substrate in the form of a film in the same shape as the outer shape of the liquid crystal layer at the time of completion of the encapsulation. The liquid crystal is divided into a plurality of droplets, and the liquid crystal is uniformly dropped within a range of the outer shape of the liquid crystal layer at the time of completion of the enclosing.

According to the present invention, the liquid crystal can be applied in the same shape as the outer shape of the liquid crystal layer at the time of completion of the encapsulation. A decrease in display quality can be suppressed. Also, measure the weight of the applied liquid crystal,
When the weight does not reach the specified weight, the insufficient amount of liquid crystal is dropped, so that the application amount can be accurately controlled.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below by taking an active matrix type liquid crystal display element as an example. The liquid crystal display element used for a notebook computer, a display, or the like has a pair of substrates facing each other, the substrates are bonded with a sealant, and a liquid crystal is sealed between the substrates. The distance (cell gap) between the substrates in which the liquid crystal is sealed is maintained by a number of spacers distributed between the substrates. Further, a TFT element, a color filter, an alignment film, a transparent electrode, and the like are formed on each substrate of the liquid crystal display element.

In the present invention, a liquid crystal display element is manufactured by supplying a liquid crystal to one of the pair of substrates and thereafter bonding the one substrate supplied with the liquid crystal to the other substrate.

FIG. 1 is a flowchart showing a method for manufacturing a liquid crystal display element according to an embodiment of the present invention. FIG.
In (a), the weight of the substrate for supplying liquid crystal is measured using an electronic balance. Here, the weight of the one substrate is measured in FIG. 1 (d) to be described later, and the difference between the weight of the one substrate coated with the liquid crystal and the weight of the one substrate before the supply is used. In order to determine the weight of

On the other hand, in order to reduce the variation in the amount of liquid crystal applied on the substrate to 1% or less of the liquid crystal amount, the electronic balance needs a measurement resolution of 0.1% of the liquid crystal amount. Therefore, for example, when the amount of liquid crystal to be applied is about 1 to 2 g, it is necessary to use a liquid that can measure up to 1 mg unit. Further, for example, when a substrate having a thickness of 0.7 mm, a length of 680 mm × 880 mm, and a weight of 1100 g is used, it is necessary to use an electronic balance capable of measuring up to about 1110 g.

In FIG. 1 (b), the liquid crystal is applied in a film shape to the same substrate as the external shape of the liquid crystal layer at the completion of the encapsulation, while measuring the weight using the above-described electronic balance. The method of applying the liquid crystal will be described later in detail.

In FIG. 1C, the weight of one substrate coated with liquid crystal is measured by using the electronic balance. In FIG. 1 (d), the weight of the liquid crystal applied on one substrate is determined from the weight difference before and after the application. Next, the weight of the applied liquid crystal is compared with an allowable range of the amount of the liquid crystal having a predetermined cell gap determined in advance to determine whether or not the weight of the applied liquid crystal is within the allowable range. I do. If it is determined that the value falls within the allowable range, the application of the liquid crystal is completed.

If it is determined in the determination of FIG. 1D that the amount of applied liquid crystal is outside the allowable range, it is determined in FIG. 1E whether the amount of applied liquid crystal is within the variation range. Is determined. Here, the variation range refers to (f) of FIG.
This is the range that can be corrected by the liquid crystal amount correction.The liquid crystal amount correction corrects the liquid crystal amount by replenishing a small amount of liquid crystal.If the amount exceeds the specified allowable range or is too small, it will be out of the variation range. Becomes

If it is determined in the determination of FIG. 1E that the amount of applied liquid crystal is out of the variation range, the process is terminated as a liquid crystal application failure, and the liquid crystal applied to the substrate is washed and removed.
It is prepared to be put into the application step again. If it is determined that the liquid crystal layer is within the range, the shortage of the amount of the applied liquid crystal is determined by using a dispenser in FIG. Dripping into
Correct the amount of liquid crystal.

In the case of dropping the liquid crystal by the dispenser, if the amount of one drop is large or the distribution is not uniform, the thickness of the liquid crystal layer becomes uneven at the completion of the encapsulation. Is performed so as to be equal. When the correction of the liquid crystal amount is completed, the process returns to FIG. 1C again, and the weight of the one substrate on which the liquid crystal is applied is measured.

Next, a method of applying the liquid crystal shown in FIG. 1B will be described. FIG. 2 is a perspective view schematically showing the slit member 30, and FIG. 3 is a cross-sectional view schematically showing an application nozzle 42 having the slit member 30. The liquid crystal is applied in a film shape by an application nozzle 42 having the slit member 30.

The slit member 30 has a triangular prism shape and has a slit 31 formed from the base to the vertex of the triangle.
Are formed over the entire length in the longitudinal direction. Coating nozzle 42
Has a slit member 30 and a container 38 filled with liquid crystal indicated by oblique lines. When the bottom of the slit member 30 is attached to and held in a liquid crystal reservoir 33 as shown in FIG. 3, the liquid crystal is slit by capillary action. It is sucked up to the opening 34 of the member 30.

When applying the rectangular liquid crystal layer, the length 32 of the opening 34 of the slit 31 is made equal to the length of one side of the rectangular liquid crystal layer, and the liquid crystal sucked up to the opening 34 and the one substrate are brought into contact. Then, the rectangular liquid crystal layer can be applied to the one substrate by relatively moving the one substrate and the application nozzle 42 by the length of the other side of the rectangular shape of the liquid crystal layer.

Next, the procedure for applying the liquid crystal will be described. FIG. 4 is a process chart showing a method of applying the liquid crystal 3 using the application nozzle 42. In FIG. 4A, the substrate 1 is vacuum-adsorbed on the downward horizontal surface of the surface plate 40 with the surface to be coated with the liquid crystal facing down, and the application nozzle 42 is connected to the opening 3 of the slit 31.
4 and one side of the one substrate 1 are held horizontally with an interval in the height direction so as to be parallel to the one substrate 1.

In FIG. 4B, the coating nozzle 42 is horizontally moved at a constant speed in a direction perpendicular to the coating nozzle 42.

In FIG. 4 (c), the liquid crystal sucked up to the opening 34 of the slit 31 and the one substrate 1
The substrate 1 is brought closer to the application nozzle 42 together with the platen 40 so that

In FIG. 4D, the application nozzle 42 is continuously moved in the horizontal direction at a constant speed while maintaining the contact state between the liquid crystal and the one substrate 1.

In FIG. 4E, when the application nozzle 42 reaches the position where the application of the liquid crystal 3 is completed, the one substrate 1 is raised together with the base 40 so that the one substrate 1 is separated from the liquid crystal.

By doing so, on one side of the substrate 1,
The liquid crystal 3 can be applied in the same rectangular film shape as the liquid crystal layer at the time of completion of the encapsulation.

The thickness of the liquid crystal 3 is determined by the height 36 from the liquid surface of the liquid crystal reservoir 33 to the opening 34, the interval 35 between the slits 31,
It is determined by the height 37 of the slit member 30, the distance between the opening 34 of the slit member 30 and the one substrate 1, the surface tension of the liquid crystal on the one substrate 1, the viscosity of the liquid crystal, and the moving speed of the application nozzle 42. Physical shape 3 of slit 31
5, 37 are determined by the design and are constant. The surface tension and the viscosity of the liquid crystal can be controlled by controlling the temperature at the time of application as long as the material of the liquid crystal and the one substrate 1 are constant.

For this reason, the distance between the opening 34 of the slit member 30 and the one substrate 1 and the opening 3
By controlling the height 36 and the moving speed of the coating nozzle 42 up to 4, the thickness of the liquid crystal 3 on the one-sided substrate 1 can be controlled. Therefore, in this application method,
If the film thickness is constant, the application amount of the liquid crystal 3 is determined by the application area, and can be managed by controlling the application start position and the application end position.

Further, in the above-described correction of the liquid crystal amount by the dispenser of FIG. 1 (f), it is impossible to reduce the amount of liquid crystal exceeding the prescribed amount. Even if the variation is maximum on the plus side, the application amount of the application nozzle 42 is set to be smaller than the specified amount of the liquid crystal so as not to exceed the upper limit of the specified amount.

As a method of applying the liquid sucked up to the opening of the slit member by the capillary phenomenon to the substrate, a method of applying a lacquer or a color filter of a liquid crystal display element is disclosed in JP-A-6-343908 and This is disclosed in JP-A-8-224528.

Next, a method of bonding one substrate 1 coated with the liquid crystal 3 by the above method to the other substrate will be described. FIG. 5 is a process chart showing a method of bonding one substrate 1 coated with liquid crystal 3 to another substrate 2. In FIG. 5A, the liquid crystal which has been subjected to the defoaming process by reducing the pressure in advance is applied to one substrate 1 by the above-described procedure so as to have the same shape as the outer shape of the liquid crystal layer at the time of completion of the encapsulation. Here, the liquid crystal 3 is applied to the substrate 1 in an amount corresponding to a prescribed liquid crystal thickness, for example, a thickness of 5 μm.

Further, spacers 5 are scattered on the other substrate 2 to provide a sealing material 4. The sealing material 4 is made of ultraviolet curing resin and has a width of 0.4 mm by a dispenser.
A line having a thickness of 25 μm, which is larger than the outer shape of the applied liquid crystal 3, and each side of the line between the outer shape of the liquid crystal 3 and the inner shape of the sealing material 4.
Drawing is performed in a rectangular frame shape with an interval of 5 mm.

In FIG. 5B, the surface of the first substrate 1 on which the liquid crystal 3 is applied and the sealing material 4 and the spacer 5 of the second substrate 2 are shown.
Each of the substrates 1 and 2 is held in the vacuum chamber 10 so that the surface provided with
Reduce the pressure to about At this time, the gas dissolved in the liquid crystal during the application and the gas molecules adsorbed on the surfaces of the substrates 1 and 2 are removed by reducing the pressure.

In FIG. 5C, one substrate 1 and the other substrate 2
Are brought close to each other until the distance becomes 0.5 mm, and then the substrates 1 and 2 are relatively moved in the horizontal direction to perform alignment. At this time, the sealing material 4 and the one substrate 1
There is a gap between them, and the sealing material 4 does not come into contact with the liquid crystal 3 or shift due to the alignment.

In FIG. 5D, while the cell gap 12 in the portion where the liquid crystal 3 exists is measured by the cell thickness gauge 11, pressure is applied while maintaining the parallel state of the two substrates 1 and 2 and gradually. Then, the sealing material 4 is crushed and bonded. At this time, the sealing material 4 has a thickness of 25 μm to 5 μm.
The line width is expanded from 0.4 mm to 2 mm.
The inner side of the sealing material 4 before being crushed is provided with an interval of 0.5 mm from the outer shape of the liquid crystal 3, and the liquid crystal 3 and the sealing material 4 are Space is filled.

At this time, if the sealing material 4 spread inward reaches the liquid crystal 3, the sealing material 4 is spread outward, so that air bubbles enter the liquid crystal 3 within the range of this spreading. Also, the flushing of the sealing material 4 does not occur. For this reason, it is possible to absorb a variation in the amount of liquid crystal and a slight displacement between the sealing material 4 and the liquid crystal 3 due to the alignment of the substrates 1 and 2.

The liquid crystal 3 is applied in the same thickness and shape as the liquid crystal layer at the time of completion of the encapsulation. Does not adhere to the entire surface of the other substrate 2.

In a conventional vacuum injection method in which a liquid crystal is injected after manufacturing an empty cell, there is no liquid crystal at the time of bonding the empty cells, and an air layer of several μm cannot be measured with high accuracy. In addition, in this method, the cell gap is controlled by empirically changing the injection time instead of measuring the cell thickness at the time of liquid crystal injection. Therefore, the fluctuation of the empty cell becomes the fluctuation of the cell gap.

In the present embodiment, the thickness of the liquid crystal 3 serving as the cell gap 12 is gradually increased while actually being measured by the cell thickness gauge 11, so that over-pressing and under-pressing can be prevented. In addition, variations in the cell gap can be eliminated. As the cell thickness gauge 11, a device for measuring retardation due to optical interference, which is used for measuring a cell gap after injection by a conventional vacuum injection method, is applied.

In FIG. 5 (e), when the liquid crystal 3 has a specified thickness, the sealing material 4 is cured by irradiating ultraviolet rays. At this time, the ultraviolet rays are irradiated only from the back surface of the substrate by the light guide path 13 to only the sealing material 4 and not to the liquid crystal 3. Thereafter, the pressure in the vacuum chamber 10 is released to return to the atmospheric pressure, and the liquid crystal display element 6 is taken out to complete the liquid crystal encapsulation.

In many cases, the ultraviolet curing resin used for the sealing material 4 is not completely cured by short-time ultraviolet irradiation. Therefore, the substrate bonded by the above procedure is put into a UV furnace, and a mask is formed on the liquid crystal 3 portion. Then, ultraviolet light is irradiated for several minutes to several tens of minutes to completely cure the sealing material 4.

Further, the curing of the sealing material 4 is promoted by heating the room temperature by about 10 ° C. to 50 ° C. However, if the heating is performed excessively, these problems do not occur because the positions of the two substrates 1 and 2 may be shifted due to thermal expansion, or the sealing material 4 may be peeled off due to the warpage of the substrates 1 and 2. It is necessary to heat in the range.

As described above, a liquid crystal display element free from uneven cell gap, liquid crystal leakage and bubbles can be produced in a short time.

In this embodiment, the application method using a coating nozzle has been described as a method for supplying the liquid crystal. However, if the weight of the supplied liquid crystal is measured and the shortage is corrected, the screen may be used. A method such as printing may be used.

[0067]

As described above, according to the present invention, since the weight of the liquid crystal supplied to one substrate is measured, the thickness of the liquid crystal layer becomes abnormal due to the shortage or excess of the liquid crystal, the cell gap becomes uneven, and the like.
A liquid crystal display element free from bubbles and liquid crystal leakage can be produced. Further, when the amount of supplied liquid crystal is not within the specified range, the bonding can be stopped, so that the substrate is not wasted. In addition, since the liquid crystal is supplied to one substrate before the two substrates are bonded, the liquid crystal can be supplied in a short time even if the substrate is large.

According to the present invention, the weight of the liquid crystal supplied to one of the substrates is compared with the specified weight, and if the weight does not reach the specified weight, the insufficient liquid crystal is added. A liquid crystal display element free from abnormal liquid crystal layer thickness, cell gap unevenness, bubbles and liquid crystal leakage due to insufficient amount can be produced in a short time.

Further, according to the present invention, the weight of the applied liquid crystal is measured, and when the weight does not reach the specified weight, the insufficient liquid crystal is divided into a plurality of drops and evenly dropped. Can be managed. Furthermore, since the liquid crystal can be applied in the same shape as the liquid crystal layer at the time of completion of the encapsulation, the flow of the liquid crystal is small, the flow of the spacers and the uneven cell gap can be prevented, and the display quality of the liquid crystal display element is improved.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating a method for manufacturing a liquid crystal display element according to an embodiment of the present invention.

FIG. 2 is a perspective view schematically showing a slit member 30.

FIG. 3 is a sectional view schematically showing a coating nozzle having a slit member.

FIG. 4 is a process chart showing a method of applying the liquid crystal 3 by an application nozzle 42.

FIG. 5 is a process chart showing a method of bonding one substrate 1 and another substrate 2;

FIG. 6 is a sectional view showing a configuration of the liquid crystal display element 6.

FIG. 7 is a schematic diagram for explaining a conventional vacuum injection method.

FIG. 8 is a process chart for explaining a manufacturing method disclosed in Japanese Patent Application Laid-Open No. 63-109413.

FIG. 9 is a process chart for explaining a manufacturing method disclosed in Japanese Patent Publication No. Hei 8-20627.

[Explanation of symbols]

 Reference Signs List 1 one substrate 2 other substrate 3 liquid crystal 4 sealing material 5 spacer 6 liquid crystal display element 10 vacuum chamber 11 cell thickness gauge 12 cell gap 13 light guide path 30 slit member 31 slit 32 opening length 33 liquid crystal reservoir 34 opening 35 slit interval 40 constant Board 42 Application nozzle

Claims (3)

[Claims] 1. A method of manufacturing a liquid crystal display element, wherein liquid crystal is supplied to one substrate and bonded to the other substrate, and the liquid crystal is sealed between substrates sandwiching a frame-shaped sealing material. A method for manufacturing a liquid crystal display element, comprising measuring the weight of the liquid crystal. 2. The liquid crystal device according to claim 1, wherein the weight of the liquid crystal supplied to the substrate is compared with a specified weight, and if the weight does not reach the specified weight, a shortage of liquid crystal is added.
The manufacturing method of the liquid crystal display element described in. 3. A liquid crystal is applied to one substrate in a film shape in the same shape as the outer shape of the liquid crystal layer at the time of completion of the encapsulation, and if the weight of the applied liquid crystal does not reach a specified weight, the insufficient liquid crystal is removed. 3. The method according to claim 2, wherein the liquid crystal layer is divided into a plurality of droplets, and the droplets are evenly dropped within a range of the outer shape of the liquid crystal layer when the encapsulation is completed.