JP2002014360A - Method and device for manufacturing liquid crystal panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a liquid crystal panel by dropping liquid crystal, by which the liquid crystal can properly and quickly be enclosed between substrates. SOLUTION: In the method for superposing one substrate on the other substrate 10 having dropped liquid crystal 30 after the liquid crystal 30 is dropped within a sealing frame 20 on the surface of the are substrate 10 disposed with the peripheral frame-like sealing frame 20, joining between the substrates by the sealing frame 20, and sealing the liquid crystal 3 within the sealing frame 20, the substrate 10 on which the liquid crystal 30 is dropped is heated by using a heater 42 built-in a holding board 40, etc., or the quantity of dropping of the liquid crystal 30 is changed in the outer peripheral side near the sealing frame 20 and the central side, or the substrates are temporally tacked together by temporal tacking materials.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a liquid crystal panel, and more particularly to a method for manufacturing a liquid crystal panel having a structure in which liquid crystal is sealed between a pair of substrates. It is intended for the manufacturing equipment used for it.

[0002]

2. Description of the Related Art A liquid crystal panel has a structure in which liquid crystal is sealed in a narrow gap formed between a pair of substrates made of glass or the like. In order to improve the quality performance of the liquid crystal panel, it is necessary to uniformly fill an appropriate amount of liquid crystal in the gap between the substrates. It is necessary to prevent thickness variations, bubbles, voids, and the like from remaining in the enclosed liquid crystal. As a method for manufacturing such a liquid crystal panel, a method is known in which liquid crystal is dropped on the surface of one substrate and then the other substrate is superimposed on the liquid crystal. One of the substrates is provided with a peripheral frame-shaped sealing frame, and by dropping liquid crystal inside the sealing frame,
The liquid crystal spreads over the entire inside of the sealing frame due to its own weight or fluidity. The other substrate is bonded to the upper surface of the sealing frame. The thickness of the sealing frame determines the distance between the substrates or the thickness of the liquid crystal.

As a method of dropping liquid crystal on the surface of a substrate, a method has been proposed in which the substrate with the liquid crystal dropped is accommodated in a decompression chamber and vacuum suction is performed so that the liquid crystal spreads quickly and evenly over the entire substrate. By the vacuum suction, the liquid crystal is quickly spread over the entire substrate, and the generation of bubbles and voids can be eliminated.

[0004]

Even with the above-described method of manufacturing a liquid crystal panel, it has been difficult to arrange liquid crystals quickly with a uniform thickness between substrates and without generation of bubbles or gaps. The liquid crystal at the stage of dropping on the surface of the substrate is in the form of a round droplet, and the droplet needs to spread by the action of gravity to form a uniform film. Since liquid crystals are viscous, it may take a considerable amount of time for the droplets to form a film, or the film may not be able to be completely formed into a flat film with partial unevenness remaining. In addition, while handling a pair of substrates sandwiching the liquid crystal in subsequent work, the substrates may shift or the liquid crystal may move, resulting in poor quality performance of the manufactured liquid crystal panel. is there.

[0005] It is an object of the present invention to provide a method for manufacturing a liquid crystal panel by dropping a liquid crystal as described above, in which liquid crystal can be properly and quickly sealed between substrates.

[0006]

A method of manufacturing a liquid crystal panel according to the present invention is a method of manufacturing a liquid crystal panel in which liquid crystal is injected and sealed between a pair of substrates facing each other with a gap. In the first method, a step (a) of heating one of the substrates on which the peripheral frame-shaped sealing frame is disposed and a step of dropping liquid crystal inside the sealing frame on the surface of the heated substrate (b), a step of superimposing the other substrate on the substrate on which the liquid crystal has been dropped, joining the substrates with a sealing frame, and sealing the liquid crystal inside the sealing frame (c).
And In the second method, a step (g) of dropping liquid crystal inside the sealing frame on the surface of one of the substrates on which the peripheral frame-shaped sealing frame is disposed, and the other substrate is placed on the substrate on which the liquid crystal is dropped. (H) bonding the substrates together with a sealing frame, and sealing the liquid crystal inside the sealing frame (h).
However, the amount of liquid crystal dropped on the outer peripheral side near the sealing frame is smaller than on the central side.

In a third method, a liquid crystal is formed inside the sealing frame on the surface of one of the substrates on which a sealing frame having a peripheral frame shape and a radiation-curable temporary fixing material are disposed outside the sealing frame. (M) and a step of superposing the other substrate on the substrate on which the liquid crystal has been dropped, and then irradiating radiation from outside the substrate to cure the temporary fixing material and temporarily fix the pair of substrates (n). ) And a step (o) of pressing the pair of temporarily fixed substrates, joining the substrates with a sealing frame, and sealing the liquid crystal inside the sealing frame. These first to third methods can be performed independently of each other, or can be performed in combination of a plurality of methods.

[Substrate] The material and the structure to be used are not limited as long as the liquid crystal can be sealed in a thin film shape and the display image can be controlled by the liquid crystal. Usually, a transparent material such as glass or synthetic resin is used. A flexible material can also be used. The size of the substrate is set according to the size of the liquid crystal panel to be manufactured. As specific dimensions of the substrate, a thickness of 0.5 to 1.1 mm and a length of 500 to 1
000 mm and a width of about 500 to 1000 mm are used. The substrate usually has a rectangular shape, but may have a square shape, a circular shape, or another shape.

[Liquid Crystal] A liquid crystal made of the same material as a normal liquid crystal panel is used. Depending on the viscosity of the liquid crystal, there are differences in characteristics such as the size of the dropped droplet and the spread after the droplet is dropped on the substrate. The viscosity can be adjusted by heating the liquid crystal. By heating the substrate on which the liquid crystal is dropped, the viscosity of the liquid crystal is adjusted. By heating, bubbles contained in the liquid crystal can be removed. Specifically, the viscosity of the liquid crystal at the stage of dropping on the substrate is 10 to 30 c.
It can be set to P. The liquid crystal can be heated to a heating temperature of about 30 to 100 ° C.

[Sealing Frame] The sealing frame is disposed on the surface of one of the pair of substrates. Liquid crystal is sealed in a space surrounded by a sealing frame. The sealing frame sets the distance between the pair of substrates and joins the substrates. The material and structure of the sealing frame may be the same as those of a normal liquid crystal panel. As a specific material for the sealing frame, an epoxy resin can be used. The height of the sealing frame is set according to the distance between the substrates or the thickness of the liquid crystal. Specifically, 0.003 to 0.01
mm range can be adopted.

The width of the sealing frame is set so that the spacing between the substrates can be maintained and the substrates can be joined to each other reliably. Specifically, it is set so as to be in a range of 0.5 to 1.5 mm in a bonded state. The sealing frame can be arranged along the outer periphery of the substrate slightly inside the outer edge of the substrate. Therefore, usually, the outer shape of the sealing frame is set to a size slightly similar to the outer shape of the substrate. However, it is also possible to make the outer shape of the substrate different from the outer shape of the sealing frame. [Dropping of Liquid Crystal] In order to drop liquid crystal on the surface of the substrate, a liquid crystal dropping means in a usual liquid crystal panel manufacturing technique can be employed.

For example, a dropper provided with a tank for storing the liquid crystal, a pump for supplying the liquid crystal, and a dropping nozzle for discharging the liquid crystal is used. The dropper may be provided with only one dropping nozzle, or a plurality of dropping nozzles may be arranged so that dropping can be performed at a plurality of locations at the same time. As the liquid crystal to be dropped, a teardrop-shaped liquid crystal can be naturally dropped from a dropping nozzle onto a substrate to form a spot-shaped droplet. By continuously dropping the liquid crystal while moving the dropping nozzle, a continuous line or a discontinuous line of the liquid crystal can be formed on the surface of the substrate.

The arrangement of the liquid crystal dropped on the surface of the substrate can be such that a large number of the above-mentioned spot-shaped droplets are arranged at intervals in front, rear, left and right. They may be arranged in a grid pattern at equal intervals in the front, rear, left and right directions, or may be arranged in a staggered manner with a slight shift in front, rear, left and right. The pitch between the front, rear, left and right can also be changed depending on the location. The pitch interval between the spot-shaped droplets can be set to about 5 to 20 mm. When forming the above-mentioned continuous line or discontinuous line, the lines may be arranged in parallel at intervals, or the continuous lines may be folded back and arranged in a folded line. It can also be arranged in a spiral.

The total amount of liquid crystal supplied to the entire substrate is set in accordance with the volume of the liquid crystal storage space surrounded by the pair of substrates and the sealing frame. By supplying a little more than the volume of the accommodation space, the excess liquid crystal can be removed. The amount of the liquid crystal of each droplet or line to be dropped may be set to an amount obtained by dividing the total amount of the liquid crystal of the entire substrate by a plurality of droplets or lines. In the case of a spot-shaped droplet, the drop amount can be set in consideration of the workability of the dropping operation, the spread after dropping, and the like. Specifically, the liquid crystal amount of one droplet can be set to about 0.0001 to 0.01 cm ³ .

When the liquid crystal is dropped on the surface of the substrate, the liquid crystal spreads over the entire inside of the sealing frame by the action of gravity to form a uniform liquid crystal layer as a whole. [Lamination of substrates] After liquid crystal is dropped onto a substrate with a sealing frame, another substrate is overlaid on the sealing frame and joined, so that a pair of substrates are integrated, and Liquid crystal is sealed. The superposition of the substrates can also be performed after holding the substrates for a certain period of time until a uniform liquid crystal layer is formed inside the sealing frame. Specific means for superimposing and joining substrates, that is, bonding means, may be the same as in the case of a normal liquid crystal panel.

The spacer particles can be glued to the other substrate to be overlapped. [Pressurization of Substrates] By pressurizing the substrates in the thickness direction, the sealing frame and the substrate can be firmly brought into close contact with each other and firmly joined. In addition, it is possible to prevent a gap from remaining between the substrates or variations or errors in the intervals between the substrates. In order to press the substrates together, a normal press machine or the like is used. The pressurizing pressure varies depending on the size and structure of the substrate, but is usually 0.5 to 2.0 kg / cm ^2.
Can be set to about.

[Vacuum Suction] By vacuum-suctioning the space containing the liquid crystal supplied on the substrate using a decompression chamber or the like,
Bubbles contained in the liquid crystal and air that causes a gap can be eliminated. The structures and working steps of the decompression chamber and the vacuum suction device may be the same as those of a normal liquid crystal panel manufacturing technique. The pressure for vacuum suction is set to about 0.05 to 0.3 torr. [Holding board] The substrate can be held on the holding board during the operation of dropping the liquid crystal onto the substrate or bonding the substrates together. It is preferable that the holding plate has a flat surface and rigidity so that the flatness of the substrate can be secured.

If a heating means such as a heater is built in the holding board, the liquid crystal dropped on the substrate from the holding board via the substrate can be heated. As the heating means, in addition to the heater, a circulation path of the heat medium may be arranged inside the holding plate. [Temporary fixing] By temporarily fixing a pair of substrates sandwiching the liquid crystal, the substrates are displaced or the liquid crystal moves in a work stage until they are joined by a sealing frame, for example, a pressing process or a vacuum suction process. Can be prevented. As the temporary fixing, means such as an adhesive, heat fusion, and fastening with metal fittings can be adopted.

As a temporary fixing means, a radiation-curable temporary fixing material can be arranged outside the sealing frame of the substrate provided with the sealing frame. After the liquid crystal is dropped on this substrate and the other substrate is overlaid, radiation is applied from the outside of the substrate to cure the temporary fixing material, whereby the pair of substrates is temporarily fixed.
It is sufficient that the shape of the temporary fixing member is fixed so that the substrates do not shift from each other, and a relatively small shape is sufficient. Also,
In order to temporarily fix the entire substrate, it can be provided at opposing sides, diagonal positions, and four corners of the substrate. The height of the temporary fixing material can be set slightly higher than the height of the sealing frame.

An ultraviolet-curable resin can be used as the temporary fixing material having radiation curability. In order to irradiate the temporary material with radiation from the outside of the substrate, at least an irradiation path of the substrate to the temporary material is configured to be capable of transmitting radiation. If the radiation is ultraviolet light, it can easily pass through a substrate made of a transparent material. By incorporating irradiation means such as a radiation irradiator in the holding plate that holds the substrate,
Radiation can be applied to the temporary fixing material through the substrate from the contact surface between the holding plate and the substrate.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Heating of Substrate] FIGS. 1 to 4 show an embodiment of a method for heating a substrate. As shown in FIG. 1, a substrate 10 made of a transparent material such as glass is disposed on a flat upper surface of a holding plate 40 made of a material having good heat conductivity such as a metal. A heater 42 is embedded in the holding plate 40, so that the entire holding plate 40 can be heated. As shown in FIG. 2, a rectangular peripheral frame-shaped sealing frame 20 is provided on the surface of the rectangular substrate 10 at a position slightly inside the outer peripheral edge. The sealing frame 20 is made of a synthetic resin.

Above the holding plate 40, a dropper 34 is arranged, and the liquid crystal 30 is dropped onto the substrate 10 from a drop nozzle 32 provided at the lower end of the dropper 34. The dropper 34
It has a beam shape crossing the substrate 10 in the width direction, and on the lower surface, dripping nozzles 32 are provided at a plurality of locations at intervals in the length direction. Therefore, in the space inside the sealing frame 20 on the surface of the substrate 10, the liquid crystal 3 is simultaneously placed at a plurality of positions in the width direction.
0 is dropped. Liquid crystal 3 dropped from drop nozzle 32
0 tends to become spherical due to its own surface tension, and becomes a tear-like shape close to spherical and is dropped on the surface of the substrate 10. On the surface of the substrate 10, the teardrop-shaped liquid crystal 30 is deformed, and the spot-shaped droplet 3 is shaped like a flat circle and dome-shaped.
6 are formed.

The dropper 34 drops the liquid crystal 30 at regular intervals while moving over the substrate 10 in the length direction. As a result, a large number of droplets 36 are arranged on the surface of the substrate 10 at intervals vertically and horizontally. The droplets 36 arranged on the surface of the substrate 10 spread in the horizontal direction by the action of gravity, and adjacent droplets 36 are connected to each other to form a layer having a uniform thickness. At this time, since the substrate 10 is heated by the holding plate 40, the droplets 36 formed on the surface of the substrate 10 are also heated, and the viscosity of the liquid crystal 30 is reduced and the fluidity is increased. As a result, the droplets 36 quickly spread along the surface of the substrate 10, the difference in thickness depending on the location is eliminated, and a layer of the liquid crystal 30 having a smooth surface is easily formed.

If a layer of the liquid crystal 30 having a uniform thickness is formed inside the sealing frame 20 on the surface of the substrate 10, the operation of the heater 42 is stopped and the heating of the holding plate 40 and the substrate 10 is completed. Good. When the heating is completed, the liquid crystal 30 is cooled to room temperature. When the liquid crystal 30 is cooled, the viscosity increases and the fluidity decreases. Even in a later step, even if the liquid crystal 30 formed into a layer having a uniform thickness is shaken or tilted, the surface of the liquid crystal 30 can be prevented from being uneven or deformed. The termination of the heating may be performed after any of the steps of laminating substrates, vacuum suction, pressurization, and the like, which will be described later. As shown in FIG. 3, the substrate 1 on which the liquid crystal 30 is supplied inside the sealing frame 20.
Another substrate 12 is laid on 0. Since the flat surface of the substrate 12 is superimposed on the layer of the liquid crystal 30 having a uniform thickness, it is possible to prevent bubbles from remaining or an uneven gap between the substrate 12 and the layer of the liquid crystal 30.

As shown in FIG. 4, the substrate 10 to which the liquid crystal 30 is supplied and another substrate 12 are placed in a decompression chamber 50, and the liquid crystal 30 is evacuated from the vacuum suction port 52 of the decompression chamber 50.
Air and air that causes gaps can be removed by suction. If the substrates 10 and 12 are bonded together under reduced pressure, air does not enter the liquid crystal 30 between the substrates 10 and 12. As a result, the space surrounded by the substrates 10 and 12 and the sealing frame 20 is filled with the liquid crystal 30 without any gap. By pressing the substrates 10 and 12 in the thickness direction at the same time as the vacuum suction step or in a pre-step or a post-step, bubbles and gaps remaining between the substrates 10 and 12 are removed.
It can be removed more reliably. Further, the gap between the substrates 10 and 12 can be accurately set to a predetermined size by bringing the sealing frame 20 and the substrates 10 and 12 into close contact with each other.

After that, by curing the sealing frame 20,
The liquid crystal 3 is provided inside the sealing frame 20 between the pair of substrates 10 and 12.
A liquid crystal panel in which 0 is sealed is manufactured. [Control of Dropping Amount] The embodiment shown in FIG. 5 has the same basic apparatus and working steps as those of the above-described embodiment, but differs depending on the location of the dropping amount of the liquid crystal supplied to the surface of the substrate. The supply of the droplets 36a and 36b on the surface of the substrate 10 inside the sealing frame 20 at intervals in the vertical and horizontal directions is the same as in the above-described embodiment. However, the amount of the droplet 36a at the outermost portion adjacent to the inner periphery of the sealing frame 20 is smaller than that of the droplet 36b arranged at the center side. Specifically, the amount of the droplet 36a is
6b is set to about 1/2 to 1/4 of the amount. Droplet 3
Both the plane diameter and the height of 6a are smaller than the droplet 36b.

In this state, another substrate 12 is superimposed on the substrate 10 to which the liquid crystal 30 has been supplied, and the substrates 10 and 12 are pressed in the thickness direction.
When the substrates 12 are brought into close contact with each other, a difference in thickness hardly occurs between the outer peripheral side near the sealing frame 20 and the central side, and a layer of the liquid crystal 30 having an appropriate and uniform thickness is easily formed over the entire surface. The reason is considered as follows. Sealing frame 2
When the substrates 10 and 12 are pressed in the thickness direction in a state where the liquid crystal 30 is sandwiched therebetween, the outer peripheral side where the sealing frame 20 which is more rigid than the liquid crystal 30 is closer is deformed as compared with the central side where only the liquid crystal 30 exists. Therefore, the thickness of the layer of the liquid crystal 30 tends to be large on the outer peripheral side and thin on the central side.

In the above-described embodiment, the droplets 36a on the outer peripheral side are small, and the thickness of the liquid crystal layer 30 on the outer peripheral side tends to be thin. In the manufactured liquid crystal panel, the substrate 1
This makes it difficult for a difference in the thickness of the layer of the liquid crystal 30 between the outer peripheral side and the central side of 0 and 12 to occur. The droplets 36a and 36
In order to make the drop amount different between b and b, the amount of the liquid crystal 30 dropped from the drop nozzle 32 by the dropper 34 may be controlled. As a specific control method, when a dropper 34 in which a plurality of dropping nozzles 32 are arranged in a row as shown in FIG. 2 is used, the dropper 34 is arranged along the inner side of the sealing frame 20. However, if the liquid crystal 30 is dropped in a state where the drop amount is adjusted to be small, a small droplet 36a can be dropped. Sealing frame 20
If the arrangement of the dropper 34 is changed along the long side and the short side, the supply of the droplet 36 a can be performed on the inner side of the four circumferences of the sealing frame 20. With respect to the large droplet 36b on the center side, the dropping amount of the dropper 34 is adjusted to be increased, and the dropper 34 is traversed in the width direction of the substrate 10, and the dropper 34
The dropping operation may be performed while moving in the length direction.

As another method, the amount of dropping at each dropping nozzle 32 of the dropper 34 is controlled while moving the dropper 34 disposed across the width direction of the substrate 10 in the length direction. When the dripping nozzle 32 is arranged at the outer peripheral position adjacent to the sealing frame 20, the droplet 36a is supplied with a reduced dripping amount, and when the dripping nozzle 32 is arranged at the center far from the sealing frame 20, the dripping amount is increased. Drops 36b can be provided. [Temporary Fixing] In the embodiment shown in FIGS. 6 and 7, basically the same work is performed by using the same device as in the above-mentioned embodiment, but the temporary fixing is further performed.

As shown in FIG. 6A, a pair of upper and lower holding plates 40 and 44 for holding the substrates 10 and 12 are accommodated in a pair of upper and lower depressurizing chamber halves 54 and 56 constituting the depressurizing chamber 50, respectively. ing. The lower holding plate 40 is movably accommodated in the horizontal direction inside the decompression chamber half 56, and the substrate 10 is mounted on the upper surface thereof. The upper holding plate 44 is provided with the substrate 12 on the lower surface.
Is held. The upper holding plate 44 is supported by a pressurizer 60 disposed so as to pass through the pressure reducing chamber half 54. The upper holding plate 44 can be moved up and down together with the pressure reducing chamber half 54, and can also be moved up and down by the pressurizer 60 separately from the pressure reducing chamber half 54.

The lower holding plate 40 has UV irradiators 7 at the four corners.
In the upper part of the UV irradiator 70, an irradiation path 72 made of a through hole or a translucent material is provided to reach the upper surface. The installation location of the UV irradiator 70 is set in accordance with the formation position of the temporary fixing member 74 of the substrate 10 described later. As shown in detail in FIG. 7, the temporary fixing members 74 are arranged on the four corners of the substrate 10 outside the sealing frame 20 on the substrate 10 placed on the lower holding plate 40. The temporary fixing member 74 is formed of an ultraviolet curable resin (hereinafter, abbreviated as UV resin),
It has almost the same height as the sealing frame 20.

The method of dropping the liquid crystal 30 on the inside of the sealing frame 20 on the substrate 10 to form the droplets 36 is the same as in the above-described embodiment. As shown in FIG. 6A, the substrate 10 on which the droplets 36 are formed is placed on the lower holding plate 40, and is arranged below the upper holding plate 44 holding the substrate 12. As shown in FIG. 6B, the upper holding plate 44 is lowered to lower the substrate 12 into the sealing frame 20 of the substrate 10 and the temporary fixing member 74.
Abut on top of In this state, if the lower holding plate 40 is moved in the horizontal direction, the position of the substrate 10 and the substrate 12 in the horizontal direction can be adjusted.

The upper and lower decompression chamber halves 54 and 56 are closed to form a decompression chamber 50 comprising a closed space. When the air inside the decompression chamber 50 is vacuum-evacuated from the vacuum suction port 52 and decompressed, bubbles remaining between the substrates 10 and 12 and air in gaps are efficiently extracted, and the liquid crystal 30 is removed from the substrates 10 and 12.
The space inside the sealing frame 20 can be reliably filled in between. When the positioning of the substrates 10 and 12 is completed, UV
When ultraviolet light is emitted from the irradiator 70, the ultraviolet light is applied to the temporary fixing member 74 from the irradiation path 72 through the transparent substrate 10. The UV resin of the temporary fixing member 74 irradiated with the ultraviolet light is cured, and the substrate 12 and the substrate 10 are joined.

After the joining of the substrates 10 and 12 by the temporary fixing member 74 is completed, the pressurizing device 60 is operated and the upper holding plate 4
4 is lowered to press the substrate 12 against the substrate 10. Thereby, the substrate 12 is strongly pressed against the sealing frame 20 of the substrate 10. Bubbles and gaps between the substrates 10 and 12 are also reliably removed. The surplus liquid crystal 30 is also discharged out of the sealing frame 20. Then, after the sealing frame 20 is cured and the substrates 10 and 12 are completely bonded,
A liquid crystal panel in which the liquid crystal 30 is sealed inside the sealing frame 20 is completed. Substrate 1 by the above-mentioned temporary fixing material 74
The temporary fixing of 0 and 12 is performed after the horizontal position adjustment between the substrates 10 and 12 is completed, before the vacuum suction step, and simultaneously.
It can be performed after, or before, or simultaneously with, the pressurizing step. The temporary fixing may be performed before the work process in which the displacement of the substrates 10 and 12 may occur.

[0035]

According to the method of manufacturing a liquid crystal panel of the present invention, in a method of dropping and enclosing a liquid crystal on a substrate, the substrate on which the liquid crystal is dropped is heated or the center is located near a sealing frame. By reducing the amount of liquid crystal dripping from the side or by temporarily fixing the upper and lower substrates and then applying pressure,
The liquid crystal can be uniformly and quickly arranged in an appropriate amount without generating bubbles or gaps between the substrates. as a result,
Efficiency of the liquid crystal panel manufacturing operation and improvement of the quality performance of the liquid crystal panel can be achieved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an embodiment of the present invention and illustrating a liquid crystal dropping process.

FIG. 2 is a perspective view

FIG. 3 is a cross-sectional view of a bonded liquid crystal panel.

FIG. 4 is a sectional view of a vacuum suction step.

FIG. 5 shows another embodiment, in which (a) a plan view and (b) a cross-sectional view of a substrate on which liquid crystal is dropped.

FIG. 6 is a cross-sectional view showing another embodiment and showing steps in steps.

FIG. 7 is a plan view of a substrate.

[Explanation of symbols]

 10, 12 Substrate 20 Sealing material 30 Liquid crystal 32 Dropping nozzle 34 Dropper 40 Holding plate 42 Heater 50 Decompression chamber 52 Vacuum suction port 60 Pressurizer 70 UV irradiator 74 Temporary fixing material

Continuation of the front page (72) Inventor Hiroyuki Naka 1006 Kadoma, Kazuma, Osaka Prefecture F-term (reference) in Matsushita Electric Industrial Co., Ltd. 2H089 LA41 MA04Y NA22 NA32 NA33 NA42 NA45 NA49 NA51 NA60 QA04 QA12 QA13 TA01 TA06 5G435 AA17 BB12 KK05

Claims (9)

[Claims] 1. A method for manufacturing a liquid crystal panel in which a liquid crystal is injected between a pair of substrates facing each other with a gap therebetween and sealed, wherein one of the substrates on which the peripheral frame-shaped sealing frame is disposed is mounted. A step of heating (a), a step of dropping liquid crystal inside the sealing frame on the surface of the heated substrate, and a step of (b). Step of bonding substrates and sealing liquid crystal inside the sealing frame
(c) A method for manufacturing a liquid crystal panel comprising: 2. The method for manufacturing a liquid crystal panel according to claim 1, wherein in the heating step (a), the substrate is heated via the holding plate by a heating means built in the holding plate holding the substrate. 3. A method for manufacturing a liquid crystal panel in which liquid crystal is injected and sealed between a pair of substrates facing each other with a gap therebetween, wherein a liquid crystal panel is formed on one of the substrates on which a peripheral frame-shaped sealing frame is disposed. Step (g) of dropping liquid crystal on the inside of the sealing frame on the surface, and overlaying the other substrate on the substrate on which the liquid crystal has been dropped, joining the substrates together with the sealing frame, and sealing the liquid crystal inside the sealing frame. Stopping process
(h), wherein the step (g) of dropping the liquid crystal includes a step of dropping the amount of the liquid crystal on the outer peripheral side closer to the sealing frame than on the center side. 4. A method for manufacturing a liquid crystal panel in which a liquid crystal is injected between a pair of substrates facing each other with a gap therebetween, and the liquid crystal panel is sealed. A step (m) of dropping liquid crystal inside the sealing frame on the surface of one of the substrates on which the temporary bonding material having curability is arranged; and (N) irradiating radiation from the outside of the substrate to harden the temporary fixing material to temporarily fix the pair of substrates, and press the pair of temporarily fixed substrates, bond the substrates with a sealing frame, and seal Sealing the liquid crystal inside the frame (o). 5. The step (m) uses a UV curable material as the temporary fixing material, and the step (n) irradiates the temporary fixing material with ultraviolet light through the substrate from outside the substrate made of a transparent material. A method for manufacturing a liquid crystal panel according to claim 4. 6. The method of manufacturing a liquid crystal panel according to claim 1, further comprising, before the step of sealing the liquid crystal, a step (v) of evacuating a space in which the liquid crystal is disposed. 7. The method for manufacturing a liquid crystal panel according to claim 1, wherein the liquid crystal is dropped in spots arranged at intervals in front, rear, left and right. 8. An apparatus used in the method according to claim 1, wherein: a holding plate for holding one of the substrates; a dropper disposed above the holding plate for dropping liquid crystal onto a surface of the substrate; An apparatus for manufacturing a liquid crystal panel, comprising: a heating unit built in a holding board and heating the substrate via the holding board. 9. An apparatus used in the method according to claim 3, wherein a holding plate for holding one of the substrates, a dropper disposed above the holding plate and for dropping liquid crystal onto a surface of the substrate, An apparatus for manufacturing a liquid crystal panel, comprising: a radiation irradiator built in a holding board and arranged corresponding to a position of a temporary fixing material on a substrate.