JP2012008395A - Method for manufacturing liquid crystal display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a liquid crystal display panel, which is capable of suppressing the occurrence of shavings, gas, etc., even when a sealant is stamped with an identification code.SOLUTION: The method for manufacturing a liquid crystal display panel includes a first step of preparing a first substrate and a second substrate stuck to each other with a liquid crystal therebetween in a state where a liquid crystal injection port is opened, a second step of providing the sealant for closing the liquid crystal injection port across the first substrate and the second substrate, a third step of pressing a prescribed area of a jig having a mark formed in the prescribed area, to the sealant to transfer the mark, and a fourth step of hardening the sealant.

Description

  The present invention relates to a method for manufacturing a liquid crystal display panel.

  Conventionally, in a liquid crystal display panel, a CF substrate and a TFT substrate are laminated via a sealing material, and liquid crystal is sealed in a space formed by the CF substrate, the TFT substrate, and the sealing material. A liquid crystal injection port into which liquid crystal is injected is formed by a CF substrate, a TFT substrate, and a part of a sealing material, and is sealed with a sealing material after the liquid crystal is injected. After sealing, an identification code such as a serial number is engraved by scraping off the sealing material with a laser or evaporating it (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 9-175025

However, when engraving with a laser, scraps and gas are generated, which may cause contamination of the production line due to the scraps and gas.
An object of the present invention is to provide a method of manufacturing a liquid crystal display panel that can suppress generation of scraps and gas even if an identification code is engraved on a sealing material.

In order to solve the above problems, according to one aspect of the present invention,
A first step of preparing a first substrate and a second substrate bonded to each other with the liquid crystal interposed therebetween with the liquid crystal injection port opened;
A second step of providing a sealing material for sealing the liquid crystal injection port so as to straddle the first substrate and the second substrate;
A third step of transferring the mark by pressing the predetermined area of the jig having the mark formed in the predetermined area against the sealing material;
And a fourth step of curing the sealing material. A method of manufacturing a liquid crystal display panel is provided.

In the method for manufacturing a liquid crystal display panel, preferably, in the fourth step, the sealing material is cured in a state where the predetermined region of the jig is in contact with the sealing material.
In the manufacturing method of the liquid crystal display panel, preferably, the sealing material includes a thermosetting resin.
In the method for manufacturing the liquid crystal display panel, preferably, the jig includes a heater, and the sealing material is heated and cured by the heater in a state where the jig is in contact with the sealing material.
In the manufacturing method of the liquid crystal display panel, preferably, the sealing material includes an ultraviolet curable resin.
In the liquid crystal display panel manufacturing method, preferably, the jig has translucency, and the sealing material is irradiated with ultraviolet rays while the jig is in contact with the sealing material to cure the sealing material. Let
In the liquid crystal display panel manufacturing method, preferably, in the first step, a sealing material is provided on the first substrate so as to surround a display region of the liquid crystal display panel, and then the sealing material is sandwiched. The first substrate and the second substrate are bonded together.
In the manufacturing method of the liquid crystal display panel, preferably, in the fourth step, the sealing material is semi-cured.
Preferably, the method for manufacturing a liquid crystal display panel includes, after the fourth step, a fifth step of completely curing the sealing material and completely curing the sealing material.
In the manufacturing method of the liquid crystal display panel, preferably, the sealing material and the sealing material include a thermosetting resin or an ultraviolet curable resin, and in the fifth step, the sealing material and the sealing material are simultaneously used. Harden.

  According to the present invention, it is possible to provide a method of manufacturing a liquid crystal display panel that can suppress generation of scraps and gas even if an identification code is engraved on a sealing material.

It is a perspective view which shows schematic structure of the liquid crystal display panel of this embodiment. It is a front view which shows the sealing material with which the liquid crystal display panel of FIG. 1 is equipped. It is a top view which shows the sealing material of FIG. It is explanatory drawing which shows typically a part of 1st process in the manufacturing method of the liquid crystal display panel of this embodiment. It is explanatory drawing which shows typically a part of 1st process in the manufacturing method of the liquid crystal display panel of this embodiment. It is explanatory drawing which shows typically a part of 1st process in the manufacturing method of the liquid crystal display panel of this embodiment. It is explanatory drawing which shows typically a part of 1st process in the manufacturing method of the liquid crystal display panel of this embodiment. It is explanatory drawing which shows typically a part of 3rd process in the manufacturing method of the liquid crystal display panel of this embodiment. It is a front view which shows the modification of the mark in the sealing material of FIG. It is a front view which shows the jig which transcribe | transfers the mark of FIG.

  The best mode for carrying out the present invention will be described below with reference to the drawings. However, although various technically preferable limitations for implementing the present invention are given to the embodiments described below, the scope of the invention is not limited to the following embodiments and illustrated examples.

  First, the liquid crystal display panel formed by the liquid crystal display panel manufacturing method of the present embodiment will be described. FIG. 1 is a perspective view showing a schematic configuration of the liquid crystal display panel 1. As shown in FIG. 1, the liquid crystal display panel 1 includes a CF substrate 10 as a first substrate and a TFT substrate 20 as a second substrate. The CF substrate 10 and the TFT substrate 20 are laminated via a seal material 30. The TFT substrate 20 has a shape having a protrusion 20a protruding from the CF substrate 10 on at least one of the four sides, and a drive circuit (not shown) is mounted on the protrusion 20a. The sealing material 30 is formed along the outer periphery of the CF substrate 10 so as to surround the display region G, and both end portions 31 and 32 thereof are in contact with the outer periphery of one side of both the substrates 10 and 20. Liquid crystal is sealed in a space formed by the CF substrate 10, the TFT substrate 20, and the sealing material 30. A liquid crystal injection port 33 into which liquid crystal is injected is formed by both end portions 31 and 32 of the CF substrate 10, the TFT substrate 20, and the sealing material 30. The liquid crystal injection port 33 is sealed with a sealing material 35 after the liquid crystal is injected.

  FIG. 2 is a front view schematically showing the sealing material 35, and FIG. 3 is a top view of the sealing material 35. As shown in FIGS. 2 and 3, the sealing material 35 is disposed on the side surface of the liquid crystal display panel 1 so as to straddle the CF substrate 10 and the TFT substrate 20. A mark 351 forming an identification code is formed on the surface of the sealing material 35. This mark 351 is composed of a plurality of grooves 352 and represents the serial number of the liquid crystal display panel 1 by the number, width and interval of the grooves 352.

  Next, a method for manufacturing a liquid crystal display panel will be described. 4-8 is explanatory drawing which shows typically each process of the manufacturing method of a liquid crystal display panel.

  First, in the first step, a CF substrate 10 having an area capable of forming the liquid crystal display panel 1 and a TFT substrate 20 are prepared. Here, the TFT substrate 20 includes a glass substrate 21, an electrode layer 22 including a plurality of pixel electrodes formed on the surface of the glass substrate 21, a thin film transistor connected to each pixel electrode, various wirings, and the like, and an electrode layer 22. And an alignment film 23 formed on the surface (see FIG. 5). On the other hand, the CF substrate 10 includes a glass substrate 11, a plurality of color filters formed at positions corresponding to the pixel electrodes on the surface of the glass substrate 11, and at least a thin film transistor at a position corresponding to the space between the pixel electrodes. And a color filter layer 12 including at least a light shielding film formed so as to overlap with the alignment layer 13 and an alignment film 13 formed on the surface of the color filter layer 12 (see FIG. 4).

  Next, a sealing material 30 is formed on the CF substrate 10. As shown in FIG. 4, the sealing material 30 is formed on the first surface 14 of the CF substrate 10 by the screen printing machine 100 for the CF substrate 10. The sealing material 30 is formed from a resin containing a thermosetting resin. The sealing material 30 is formed so as to surround the display area G of the liquid crystal display panel 1.

  Thereafter, the CF substrate 10 and the TFT substrate 20 are bonded together. At the time of bonding, first, as shown in FIG. 5, a large number of spacers 50 are sprayed on the first surface 24 of the TFT substrate 20 by the spacer spraying device 300. The spacer 50 is, for example, a transparent resin bead, and the diameter thereof is set to a value that sets the predetermined gap between the CF substrate 10 and the TFT substrate 20. Note that. In addition to resin beads, a photo spacer can be used as the spacer 50.

  Thereafter, as shown in FIG. 6, the CF substrate 10 and the TFT substrate 20 are disposed in the bonding apparatus 400, and the first surface 14 of the CF substrate 10 and the first surface 24 of the TFT substrate 20 face each other and are sealed. The CF substrate 10 and the TFT substrate 20 are bonded together so as to sandwich the material 30.

  After the bonding, the CF substrate 10 and the TFT substrate 20 are transferred from the bonding apparatus 400 into a vacuum injecting apparatus (not shown), and the apparatus is brought to a vacuum pressure. The liquid crystal injection port 33 is immersed in a liquid crystal tank (not shown) in which the liquid crystal 39 is stored while the inside of the vacuum injection apparatus is at a vacuum pressure, and then returned to normal pressure. At this time, the space formed by the CF substrate 10, the TFT substrate 20, and the sealing material 30 remains at a vacuum pressure, so that the liquid crystal 39 is sucked into the space. Further, the CF substrate 10 and the TFT substrate 20 gradually approach each other while crushing the sealing material 30 and the liquid crystal 39 as shown in FIG. Eventually, the substrates 10 and 20 are close to each other until the spacer 50 is sandwiched. A liquid crystal 39 is filled in the space formed by the CF substrate 10, the TFT substrate 20, and the sealing material 30 in a state where a predetermined gap is formed between the substrates 10 and 20 by the spacer 50. Thereby, the first step is completed.

  In the second step, the liquid crystal injection port 33 is sealed with the sealing material 35. Specifically, the sealing material 35 is injected toward the liquid crystal injection port 33 from between the CF substrate 10 and the TFT substrate 20. At this time, the sealing material 35 is injected until the sealing material 35 closes the liquid crystal injection port 33 and protrudes from the liquid crystal injection port 33 and straddles the CF substrate 10 and the TFT substrate 20. Here, a resin containing a thermosetting resin is used as the sealing material 35.

  In the third step, a mark 351 is formed on the sealing material 35. Specifically, as shown in FIG. 8, the predetermined region of the jig 45 in which the convex mark 451 is formed in the predetermined region is pressed against the surface of the sealing material 35 to transfer the mark 451. Thereby, a concave mark 351 is formed on the sealing material 35.

  In the fourth step, the sealing material 35 is cured. Here, a heater 452 is built in the jig 45, and if the sealing material 35 is heated by the heater 452 in a state where the jig 45 is in contact with the sealing material 35, the heat contained in the sealing material 35. The curable resin is cured. In the fourth step, the sealing material 35 is cured to semi-cured. After semi-curing, the jig 45 is removed from the sealing material 35.

  In the fifth step, the bonded CF substrate 10 and TFT substrate 20 are heated until the sealing material 30 and the sealing material 35 are completely cured. Thereby, the liquid crystal display panel 1 is formed.

As described above, according to the present embodiment, the predetermined region of the jig 45 having the mark 451 formed in the predetermined region is pressed against the sealing material 35 to transfer the mark 451, and the mark 351 is formed on the sealing material 35. Therefore, the identification code can be engraved on the sealing material 35 without generating scraps or gas that causes contamination.
Further, the mark 351 can be corrected before the sealing material 35 is cured.

Further, since the sealing material 35 is cured in a state where the predetermined region of the jig 45 is in contact with the sealing material 35, the sealing material 35 can be cured while maintaining the shape of the mark 351. Accordingly, the mark 351 can be transferred even with the sealing material 35 having a low viscosity.
Furthermore, since the sealing material 30 and the sealing material 35 are completely cured at the same time, the curing time can be shortened compared with the case where they are completely cured individually.

Note that the present invention is not limited to the above embodiment, and can be modified as appropriate.
For example, although the case where the sealing material 30 is formed by screen printing is illustrated in the above embodiment, the sealing material 30 can also be formed by a dispenser.
Moreover, in the said embodiment, although the case where the sealing material 30 was formed in the CF substrate 10 was illustrated, you may form the sealing material 30 in the TFT substrate 20. FIG.

Moreover, in the said embodiment, although the case where the sealing material 35 is formed from resin containing a thermosetting resin is illustrated, you may form the sealing material 35 with resin containing an ultraviolet curable resin. . In this case, it is preferable that the jig 45 is formed of a material having translucency. Even if the sealing material 35 is irradiated with ultraviolet rays in a state where the light-transmitting jig 45 is in contact with the sealing material 35, the ultraviolet rays pass through the jig 45 and reach the sealing material 35. As a result, the sealing material 35 is cured.
More preferably, if the sealing material 30 is also formed of a resin containing an ultraviolet curable resin, the sealing material 30 and the sealing material 35 can be completely cured simultaneously by irradiating with ultraviolet rays in the fifth step. It becomes.
In addition, you may form the sealing material 35 from resin containing both a thermosetting resin and an ultraviolet curable resin. In that case, for example, if the sealing material 35 is heated by the heater 452 in a state where the jig 45 is in contact with the sealing material 35, even if the heating time is mistakenly prolonged, it can be completely cured. Since it disappears, the mark 351 can be corrected with certainty.

  Moreover, in the said embodiment, although the case where the mark 351 of the sealing material 35 was formed from the some groove | channel 352 was illustrated, it may also be set as the mark 351a which consists of numerals like the sealing material 35a shown in FIG. Is possible. In this case, the jig 45a is formed with a mark 451a composed of inverted numbers as shown in FIG. In addition to the numbers, characters, symbols, and the like may be used.

Moreover, in the said embodiment, although the sealing material 35 is semi-hardened, you may make it harden | cure completely.
If the sealing material 35 has sufficient viscosity, the predetermined region of the jig 45 is pressed against the sealing material 35 to transfer the mark 451, and then the jig 45 is removed from the sealing material 35. The bonded CF substrate 10 and TFT substrate 20 may be heated until the sealing material 30 and the sealing material 35 with marks 451 are completely cured.

1 Liquid crystal display panel 10 CF substrate (first substrate)
20 TFT substrate (second substrate)
30 Sealing material 33 Liquid crystal inlet 35 Sealing material 39 Liquid crystal 45 Jig 351 Mark 451 Mark 452 Heater G Display area

Claims (10)

A first step of preparing a first substrate and a second substrate bonded to each other with the liquid crystal interposed therebetween with the liquid crystal injection port opened;
A second step of providing a sealing material for sealing the liquid crystal injection port so as to straddle the first substrate and the second substrate;
A third step of transferring the mark by pressing the predetermined area of the jig having the mark formed in the predetermined area against the sealing material;
And a fourth step of curing the sealing material. A method of manufacturing a liquid crystal display panel, comprising: In the manufacturing method of the liquid crystal display panel of Claim 1,
In the fourth step, the sealing material is cured in a state where the predetermined region of the jig is in contact with the sealing material. In the manufacturing method of the liquid crystal display panel of Claim 1 or 2,
The method for manufacturing a liquid crystal display device, wherein the sealing material includes a thermosetting resin. In the manufacturing method of the liquid crystal display panel of Claim 3,
The said jig is provided with a heater, The said sealing material is heated and hardened with the said heater in the state which the said jig contacted the said sealing material, The manufacturing method of the liquid crystal display device characterized by the above-mentioned. In the manufacturing method of the liquid crystal display panel as described in any one of Claims 1-4,
The method for manufacturing a liquid crystal display panel, wherein the sealing material contains an ultraviolet curable resin. In the manufacturing method of the liquid crystal display panel of Claim 5,
The method of manufacturing a liquid crystal display panel, wherein the jig has translucency, and the sealing material is cured by irradiating the sealing material with ultraviolet rays in a state where the jig is in contact with the sealing material. . In the manufacturing method of the liquid crystal display panel as described in any one of Claims 1-6,
In the first step, a sealing material is provided on the first substrate so as to surround a display area of the liquid crystal display panel, and then the first substrate and the second substrate are bonded so as to sandwich the sealing material. A method for producing a liquid crystal display panel. In the manufacturing method of the liquid crystal display panel of Claim 7,
In the fourth step, a method for manufacturing a liquid crystal display panel, wherein the sealing material is semi-cured. In the manufacturing method of the liquid crystal display panel of Claim 8,
A method for manufacturing a liquid crystal display panel, comprising following the fourth step, a fifth step of completely curing the sealing material and completely curing the sealing material. In the manufacturing method of the liquid crystal display panel of Claim 9,
The sealing material and the sealing material include a thermosetting resin or an ultraviolet curable resin, and in the fifth step, the sealing material and the sealing material are simultaneously cured. Method.

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