JPH0950035A - Manufacture of liquid crystal panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a liquid crystal panel by which a wall body can accurately be formed on a substrate. SOLUTION: First of all, an original printing plate 1 having a planar ink passing part 13 consisting of a seal material surrounding liquid crystal is mounted on the surface 2a of the substrate 2, and is made in close contact with the surface 2a by attracting the plate 11 from the back side of the substrate 2 by an electromagnet 15. By rubbing the plate 11 with ink, the ink is printed on the surface 2a through the passing part 13. Next, the ink printed on the substrate 2 is solidified to form the seal material.

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 panel, and more particularly to a method for manufacturing a liquid crystal panel capable of forming a wall member such as a sealing material on a substrate with high accuracy.

[0002]

2. Description of the Related Art A liquid crystal panel 100, as shown in FIG.
The liquid crystal 1 is made of a transparent insulating material such as a glass material.
The substrates 2 and 3 are arranged to face each other with the seal member 5 as a wall body surrounding the liquid crystal formed between the substrates 2 and 3.

As a method of forming the sealing material 5, a method of attaching the surface 2a of one of the substrates 2 by screen printing is generally used, and the other substrate 3 is thereafter bonded. The screen printing is performed by the seal material 5 to be formed.
Using a printing original plate having an ink passing portion having a planar shape, the printing original plate is mounted on the surface 2a of the substrate 2, and then an ink made of a thermosetting resin or the like is rubbed on the printing original plate to pass through the ink passing portion to the substrate surface. The seal material 5 is formed by printing on 2a.

[0004]

By the way, the sealing material 5 is an element for determining the gap between the substrates 2 and 3, and the improvement of the precision leads to the improvement of the quality of the liquid crystal panel 100. Therefore, the inventors of the present invention conducted a study on further improving the accuracy of the sealing material 5, and found that the printing original plate was used as the substrate 2
It came to be recalled that the holding power of the printing original plate was improved when it was mounted on the surface 2a. However, on one side of the printing original plate,
The substrate 2 is arranged, and a mechanism for rubbing the ink on the printing original plate must be provided on the other surface of the printing original plate. Therefore, it is difficult to improve the holding power of the printing original plate by the conventional screen printing.

In view of the above circumstances, it is an object of the present invention to provide a method of manufacturing a liquid crystal panel which can form a wall body on a substrate with high accuracy.

[0006]

According to a method of manufacturing a liquid crystal panel according to claim 1, a printing original plate having an ink passing portion having a planar shape of a wall body to be formed is mounted on a surface of the substrate, and the printing original plate is mounted on the substrate. First step of adsorbing magnetic force from the back side of the substrate to bring it into close contact with the substrate surface, and second step of printing on the substrate surface through the ink passage portion by rubbing the ink on the printing original plate.
The above-mentioned step and the third step of solidifying the ink printed on the substrate to form a wall body are the means for solving the above problems. Therefore, in the state where the printing original plate is adsorbed on the substrate, the printing original plate is rubbed with the ink and the ink is printed on the substrate, so that the deviation between the printing original plate and the substrate is prevented, and the ink is applied to the substrate, Ink printing position accuracy is ensured. Further, since the ink printed on the substrate forms a three-dimensional shape with the ink passage portion as a mold, it is possible to highly accurately form the wall body of the target shape by being solidified.

According to a second aspect of the present invention, there is provided a method of producing a liquid crystal panel according to the first aspect, wherein in the second step, the squeegee reciprocates by rubbing ink on the surface of the printing original plate. What was done by the motion was made into the solution means of the said subject. Therefore, the reciprocating movement of the squeegee with respect to the printing original plate ensures the printing of the ink on the substrate. Further, since the printing original plate is in surface-contact with the substrate in a pressure-contact state, the displacement of the printing original plate and the substrate in the surface direction is prevented when the squeegee reciprocates.

The method for producing a liquid crystal panel according to claim 3 is the method for producing a liquid crystal panel according to claim 1 or 2, wherein the ink comprises a base material and particles which are constituent materials of the wall body. At least a part of the substrate is made of the same material as the means for solving the above problems. Therefore, since the wall body and the substrate have various properties close to each other, the wall body and the substrate are surely integrated, and the wall body and the substrate have substantially uniform electrical and physical properties as a whole. be able to.

According to a fourth aspect of the present invention, there is provided a method of producing a liquid crystal panel according to the third aspect, wherein the third step is a step of firing particles in the ink integrally with the substrate. Was used as a means for solving the above problems. Therefore, by burning the ink printed on the substrate, it is possible to evaporate the base material and fire the wall body made of particles in the ink.

A method for manufacturing a liquid crystal panel according to a fifth aspect is the method for manufacturing a liquid crystal panel according to any one of the first to third aspects, wherein the third step is a step of irradiating the ink with far infrared rays. There is a solution to the above problems.
Therefore, the surface layer and the inside of the ink are uniformly heated and solidified by the action of far infrared rays. Further, since the substrate is heated at the same time as the ink is heated, the components in the ink and the substrate are integrated with the solidification of the ink, and the solidification time can be shortened.

A method for manufacturing a liquid crystal panel according to claim 6 is the method for manufacturing a liquid crystal panel according to any one of claims 1 to 3, wherein the ink contains an ultraviolet curable substance, and the third step is The step of irradiating the ink with ultraviolet rays to cure the ultraviolet-curable substance is the means for solving the above-mentioned problems. Therefore, since the ink is solidified by the curing of the ultraviolet curable substance, the heat input to the ink and the substrate is small, and there is no fear of distortion or deformation due to heat input or cooling.

The method of manufacturing a liquid crystal panel according to claim 7 is the method of manufacturing a liquid crystal panel according to any one of claims 1 to 6, wherein after the completion of printing the ink on the substrate, adsorption by the magnetic force on the back side of the substrate is performed. The means for solving the above-mentioned problems is provided with a fourth step of weakening the force and adsorbing the printing original plate main body from the back side by magnetic force to separate the main plate from the substrate. Therefore, after the printing of the ink on the substrate is completed, the magnetic force generated by the magnetic force generation source on the back side of the substrate is weakened or the magnetic force generation source is moved away from the substrate to weaken the attraction force to the printing original plate. Since the separation of the printing original plate from the substrate is adsorption by the magnetic force from the back surface of the printing original plate, the adsorption force acts over a wide range of the printing original plate, so that the printing original plate can be stably released without causing distortion or the like.

The liquid crystal panel manufacturing method according to claim 8 is the method for manufacturing a liquid crystal panel according to any one of claims 1 to 7, wherein the wall body is a sealing material surrounding the liquid crystal. And the solution. Therefore, claim 1
The sealing material can be formed in the same manner as the method for manufacturing a liquid crystal panel according to any one of items 1 to 7.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a method for manufacturing a liquid crystal panel according to the present invention will be described below with reference to the drawings. The liquid crystal panel manufacturing method of the present invention is characterized by the process of forming the wall member such as the sealing material 5 on the surface 2a of the substrate 2 shown in FIG.

FIG. 1 shows a printing plate 11 on the surface 2a of a substrate 2.
It is a figure which shows the process (1st process) which installs and adsorb | sucks, and the board | substrate 2 is a board | plate material made of glass, and has the flat surface 2a.

On the other hand, the printing original plate 11 is a thin plate material having a thickness of about several μm, and has a groove shape shown in FIG. 1 which forms a sealing material 5 to be formed on the surface 2a of the substrate 2 as shown in FIG. The ink passage portion 13 is formed so as to penetrate therethrough in the thickness direction.
As the printing original plate 11, (1) the printing original plate 11 formed by dispersing and fixing ferromagnetic powder in a binder, or (2)
A printing original plate 11 in which an ink passage portion 13 is formed on a thin plate made of a ferromagnetic material can be used.

(1) As the ferromagnetic powder dispersed and fixed in a binder, a mesh screen woven with synthetic fibers such as nylon or polyester or fine metal wires such as stainless steel is used to pass ink in a printing pattern. Part 13
It is possible to use, for example, a resin layer to which ferromagnetic powder is added, which is formed in other portions. In this case, as a method for forming the resin layer, a well-known photoresist to which ferromagnetic powder is added is applied to the screen, and the screen is exposed to an inverted shape of a printing pattern, and then an unnecessary portion is removed. A method of forming the ink passage portion 13 by using the above method is preferable. As the ferromagnetic material, any of the conventionally known ferromagnetic materials such as iron, cobalt, nickel or alloys thereof, oxide-based magnetic materials, and compound-based magnetic materials can be used. If sufficient tensile strength can be obtained only with the resin layer, the mesh screen is omitted and metal powder-added resin (so-called rubber magnets and plastic magnets are included)
The printing original plate 11 may be formed only from the above. In that case, the printing original plate 11 is etched or machined to form openings (ink passing portions) forming a printing pattern. Further, the mesh screen may be formed of a ferromagnetic material.

(2) Ink passage portion 13 on a thin ferromagnetic metal plate
As the material having the ink passage portion 13 formed therein, a thin plate of a ferromagnetic metal such as soft iron, cobalt alloy, nickel alloy or the like is punched and processed by a method such as laser processing or etching to form the ink passage portion 13 forming a print pattern can be used. .
A reinforcing mesh screen may be attached to the thin metal plate on which the ink passage portion 13 is formed.

The sealing material 5 shown in FIG. 3 is obtained by solidifying the ink 14 printed on the substrate surface 2a by being filled in the ink passage portion 13 of the printing original plate 11 as shown in FIG. This ink 14 contains protein etc.,
Substrate 14a that can be solidified from a fluid state due to temperature change or the like
The glass particles 14b of the same quality as the substrate 2 are dispersed therein.

A method of forming the sealing material 5 on the surface 2a of the substrate 2 using the printing original plate 11 and the like will be described below. In the first step, as shown in FIG. 1, the printing original plate 11 is mounted on the front surface 2a of the substrate 2, and the printing original plate 11 is adsorbed by the magnetic force of the electromagnet 15 from the back side of the substrate 2 and brought into close contact with the substrate surface 2a.
At this time, in the electromagnet 15, the attracting force of the printing original plate 11 is controlled by adjusting the current in the current supply means (not shown).

In the second step, as shown in FIG. 2, the upper surface 11a of the printing original plate 11 is provided so as to be capable of friction and sliding,
The ink 14 is supplied to the front side in the sliding direction of the squeegee 16 that is on standby at the standby position (direction of arrow A in the figure), and the squeegee 1
6 is driven. Then, the ink 14 becomes squeegee 16
Is rubbed against the printing original plate 11 by the ink passing portion 13
Is printed on the substrate 2 through. In this step, the squeegee 16 is reciprocally driven on the upper surface 11 a of the printing original plate 11, and the reciprocal driving of the squeegee 16 causes the ink 1
4 is pressed into the ink passage portion 13 with high density. Also,
In this embodiment, the entire surface of the printing original plate 11 is in pressure contact with the substrate surface 2a due to the attracting force of the electromagnet 15, so that generation of a gap or the like is prevented. Therefore, a sufficient frictional force is generated in the surface direction, and even when the squeegee 16 reciprocates while rubbing the upper surface 11a of the printing original plate 11, the displacement of the printing original plate 11 can be effectively prevented. Therefore, the ink 14 on the substrate surface 2a
It is possible to secure the accuracy of printing position of the ink 14 and the printing position of the ink 14. Further, even if the squeegee 16 is strongly pressed against the upper surface 11a of the printing original plate 11, the printing original plate 11 does not shift, so that the ink 14 can be pressed into the ink passage portion 13 with high density. Therefore, it is possible to more faithfully form a three-dimensional shape having the ink passing portion 13 of the printing original plate 11 as a mold, and thus it is possible to form a wall body having a target shape with high accuracy.

In the third step, the electromagnet 15 is de-energized, the printing original plate 11 is removed from the substrate 2 (see FIG. 3), and then the ink 14 printed on the substrate 2 is dried and solidified.
The solidification of the ink 14 may be performed by sintering or the like depending on the material of the ink 14. In addition, when sintering, ink 1
Since 4 contains protein, the volume shrinkage during printing of the ink 14 is less than that of the organic solvent, and the target shape is maintained.

Further, the third step includes a fourth step of releasing the energization, adsorbing the printing original plate 11 from its back surface by magnetic force, and separating it from the substrate 2. According to this, the suction force acts over a wide range of the printing original plate 11, and the printing original plate 1
The disengagement can be stably performed without causing distortion or the like in 1. Further, in this detaching work, the printing original plate 11 can be accurately moved along the height direction of the sealing material 5, so that the wall shape is not affected.
De-energization of the electromagnet 15 may be replaced by moving the electromagnet 15 away from the substrate 2. The printing original plate 11 after being separated from the substrate 2 moves to the mounting position on the substrate 2 again, and
It is repeatedly used to print the ink 14. It is also possible to attract the printing original plate 11 with a permanent magnet instead of the electromagnet 15. In this case, the attraction force of the printing original plate 11 is adjusted by moving the permanent magnet toward and away from the substrate 2.

As described above, according to the method of this embodiment, the ink 14 is rubbed and printed on the printing plate 11 in a state where the printing plate 11 is attracted by the attraction force of the electromagnet 15 and pressed against the substrate 2. , The adhesion of the printing original plate 11 to the substrate 2 is secured and the displacement in the surface direction is prevented,
It is possible to secure the ink 14 on the substrate 2 and the printing position accuracy of the ink 14.
Can be formed with high accuracy and easily. This reduces the manufacturing cost of the liquid crystal panel 100 shown in FIG. 4 and improves the manufacturing efficiency thereof. In addition, since the ink passage portion 13 in the printing original plate 11 can be easily designed, the degree of freedom in setting the formation interval, shape, formation position, etc. of the seal material 5 is improved.

As shown in FIG. 4, the surface 2a of the substrate 2 is
The sealing material 5 formed so as to surround the liquid crystal 1 is
A thermosetting adhesive (for example, a thermosetting epoxy resin) is attached to the periphery of the adhesive and is attached to the other substrate 3. However, by including the thermosetting adhesive in the ink 14 so that the sealing material 5 itself has an adhesive effect, the adhesion of the thermosetting adhesive is omitted when adhering to the other substrate 3. May be

Further, the ink 14 may be made to contain an ultraviolet curable substance, and the ink 14 may be irradiated with ultraviolet rays to be cured. In this configuration, the ink 14
Since the heat input to the substrate 2 is small and there is no concern about distortion or deformation due to heat input or cooling, the accuracy of forming the wall body such as the sealing material 5 is further improved.

When the ink 14 which can be solidified by natural drying is used, far infrared rays can be used for drying the ink 14. In the case of this method, since the surface layer and the inside of the ink 14 are heated and solidified evenly, the residual stress is small inside the wall made of the ink 14 and the quality is stable. Further, since the substrate 2 is heated at the same time as the ink 14 is heated, the components inside the ink 14 and the substrate 2 are separated from each other by the ink 14
It can be integrated easily and surely with solidification, and the solidification time can be shortened.

By mixing the fine powder of the ferromagnetic material described above with the ink 14, the ink 14 held in the ink passage portion 13 is attracted by the magnetic force toward the wall body such as the sheet material 5. It is also possible to improve the dischargeability of the ink 14 from the ink passage portion 13. Ink passage part 1
If unevenness is provided within the wall 3, it is possible to form walls such as the sealing material 5 having various shapes. However, the ink passing portion 13
The inner irregularities have a shape in which the printed ink shape is not destroyed when the printing original plate 11 is detached.

Further, in the above embodiment, the case where the wall body serving as the seal material 5 surrounding the liquid crystal 1 is formed on the surface 2a of the substrate 2 as shown in FIG. Has polarizing plates 6 and 7 on the outer surfaces of the substrates 2 and 3, and between the polarizing plates 6 and 7 and the substrates 2 and 3,
Walls 8 and 9 such as a display mask or a cushioning material are provided. Therefore, it goes without saying that the walls 8 and 9 can be printed on the substrates 2 and 3 by the same method as described above.

[0030]

As described above, according to the method of manufacturing a liquid crystal panel according to the first aspect of the present invention, the printing original plate is adsorbed on the substrate and the ink is rubbed against the printing original plate and the ink is applied to the substrate. Since the printing is performed, it is possible to ensure that the ink is applied to the substrate and the printing position accuracy of the ink is high. Further, since the ink printed on the substrate forms a three-dimensional shape with the ink passage portion as a mold, it is possible to highly accurately form the wall body of the target shape by being solidified. Therefore, it is possible to easily and accurately form a wall body having a target shape at a target position on the surface of the substrate. Further, this reduces the manufacturing cost of the liquid crystal panel and improves the manufacturing efficiency thereof. In addition, since it is easy to design the ink passage portion in the printing original plate, there is an excellent effect that the degree of freedom in setting the wall forming interval, shape, forming position, etc. is improved.

According to the method of manufacturing a liquid crystal panel of claim 2, in the second step, since the rubbing of the ink is performed by the reciprocating movement of the squeegee that slides on the surface of the printing original plate, the ink is reliably printed on the substrate. Therefore, the accuracy of forming the wall body is further improved. Further, since the printing original plate is in surface contact with the substrate in a pressure contact state, when the squeegee reciprocates, the printing original plate and the substrate are prevented from being displaced in the surface direction, and high manufacturing accuracy can be easily obtained.

In the method of manufacturing a liquid crystal panel according to a third aspect, at least a part of the ink particles and the substrate are made of the same material, and since the wall body and the substrate have various properties close to each other, the wall body and the substrate are integrated. The liquid crystal panel can be manufactured easily and at low cost, while the wall structure and the substrate have substantially uniform electrical and physical properties.

According to the method of manufacturing a liquid crystal panel of the fourth aspect, the ink printed on the substrate is burned to evaporate the ink base material and burn the wall made of particles in the ink. The integration with the wall can be achieved more reliably, and the electrical properties and physical properties of the liquid crystal panel can be easily made uniform.

According to the method of manufacturing a liquid crystal panel of claim 5, since the ink is solidified by irradiation with far infrared rays,
The surface layer and the inside of the ink are evenly heated and solidified, and the residual stress inside the wall is small and the quality is stable. Further, since the substrate is also heated at the same time as the heating of the ink, the components in the ink and the substrate are easily and surely integrated with solidification of the ink. Further, it is possible to shorten the solidification time.

According to the method of manufacturing a liquid crystal panel of the sixth aspect, since the ink is solidified by the curing of the ultraviolet curable substance, the heat input to the ink and the substrate is small, and there is concern about distortion or deformation due to heat input or cooling. The accuracy of forming the wall is further improved.

According to the method of manufacturing a liquid crystal panel of claim 7, the printing original plate is attracted by a magnetic force from the back surface thereof to be separated from the substrate, whereby the adsorption force acts over a wide range of the printing original plate, and the printing original plate Since it is possible to perform stable separation without causing distortion, etc. and does not affect the ink shape after printing, the wall forming accuracy is further improved, and when the printing original plate is repeatedly used for a long period of time. Also in this case, the printing accuracy of the ink can be secured.

According to the method of manufacturing a liquid crystal panel of claim 8, the effect of the method of manufacturing a liquid crystal panel according to any one of claims 1 to 7 is achieved by providing a sealing material having a target shape at a target position on the surface of the substrate. It can be formed with high accuracy and easily.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a liquid crystal panel manufacturing method according to the present invention, and is a diagram showing a step (first step) of placing and adsorbing a printing original plate on the surface of a substrate.

FIG. 2 is a side cross-sectional view showing a step (second step) of rubbing the ink into the ink passage portion in the embodiment.

FIG. 3 is a perspective view showing a sealing material of the liquid crystal panel formed according to the same embodiment.

FIG. 4 is a side sectional view showing a liquid crystal panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Liquid crystal 2 ... Substrate 2a ... Front surface 3 ... Substrate 5 ... Sealing material (wall body) 8, 9 ... Wall body 11 ... Printing original plate 11a ... Top surface (front surface) 13 ... Ink passage part 14 ... Ink 14a ... Glass particles (particles) 16 ... Squeegee 100 ... Liquid crystal panel

Claims (8)

[Claims] 1. A method of manufacturing a liquid crystal panel, comprising a substrate which is disposed opposite to each other with a liquid crystal interposed therebetween and has a wall body formed on the surface thereof, and which has an ink passage portion having a planar shape of the wall body to be formed. The first step of mounting the printing original plate on the surface of the substrate and adsorbing the printing original plate from the back side of the substrate by magnetic force to bring it into close contact with the substrate surface; and the surface of the substrate through the ink passing portion by rubbing ink on the printing original plate. The second step of printing on the substrate, and the third step of solidifying the ink printed on the substrate to form the wall body.
And a step of manufacturing the liquid crystal panel. 2. The liquid crystal panel manufacturing method according to claim 1, wherein in the second step, rubbing of ink is performed by reciprocating movement of a squeegee that slides on the surface of the printing original plate. Panel manufacturing method. 3. The method of manufacturing a liquid crystal panel according to claim 1, wherein the ink is composed of a base material and particles serving as a constituent material of the wall body, and the particles and at least a part of the substrate are the same. A method for manufacturing a liquid crystal panel, which is made of a material. 4. The method of manufacturing a liquid crystal panel according to claim 3, wherein the third step is a step of firing particles in the ink integrally with the substrate. . 5. The liquid crystal panel manufacturing method according to claim 1, wherein the third step is a step of irradiating ink with far infrared rays. Production method. 6. The method for manufacturing a liquid crystal panel according to claim 1, wherein the ink contains an ultraviolet curable substance, and the third step is to irradiate the ink with ultraviolet rays. A method of manufacturing a liquid crystal panel, which comprises a step of curing the ultraviolet curable substance. 7. The method of manufacturing a liquid crystal panel according to claim 1, wherein after the printing of the ink on the substrate is completed, the attraction force due to the magnetic force on the back side of the substrate is weakened so that the printing plate body is placed on the back side thereof. A method of manufacturing a liquid crystal panel, comprising a fourth step of magnetically adsorbing and separating from a substrate. 8. The method of manufacturing a liquid crystal panel according to claim 1, wherein the wall body is a sealing material that surrounds the liquid crystal.