JPH02146520A - Manufacture of liquid crystal panel - Google Patents

Abstract

PURPOSE:To facilitate installation in a liquid crystal injecting jig and to easily clean a spacer plate by interposing cells between mutually coupled spacer plates and pressing the cells at a time. CONSTITUTION:The coupled spacer plates 6 which are one more than the cells where liquid crystal is injected at a time are cleaned with fleon and dried, and the coupled sheet 7 is folded and put in the injecting jig 5. The cells 1 are inserted into gaps which are formed, one by one, in a specific direction and applied with specific pressure by a pressure plate 3. In this state, the injecting jig 5 is heated in a vacuum container and exposed in this state to a pressure-reduced atmosphere for a constant time, the injection holes of the cells 1 are dipped in the liquid crystal in the vacuum container, and the atmosphere in the vacuum container is returned to the atmospheric pressure to inject the liquid crystal into between substrates by the difference between the internal pressure and external pressure. Consequently, many cells 1 can easily be set in the injecting jig 5 and the spacer plates 6 can easily be cleaned, so a liquid crystal panel with gap accuracy is formed with good productivity.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a liquid crystal display panel. The present invention relates to a method for manufacturing a liquid crystal panel in which an adhesive is applied to and cured.

BACKGROUND ART Conventionally, the following method has been common as a method for manufacturing a liquid crystal panel.

That is, after applying alignment treatment such as rubbing to the surfaces of the two substrates, which were formed by sequentially applying a transparent electrode film such as ITO and an alignment film for aligning liquid crystal to the surface, As shown in the figure, a sealing material 2 such as a thermosetting adhesive is applied to one substrate 1a in a partially interrupted ring shape, and bead spacers or glass fibers with a diameter of several microns are applied to this substrate 1a or the other substrate 1b. Spread.

After that, after accurately aligning these substrates 1a and lb, they are pasted together via the sealing material 2 and the dispersed spacers, and the sealing material 2 is heated and cured while applying pressure uniformly from both sides of the substrates 1a and lb. do. Here, two substrates 1a
, 1b are sealed except for the partially interrupted part of the annular sealing material 2 (liquid crystal injection port), and a hollow cell 1 is formed (Fig. 7). , 8th
As shown in the figure, a plurality of sheets are set in an overlapping state in an injection jig 5, and heated to 40 to 50°C in a vacuum container while being pressurized with a predetermined load by a pressure plate 3 biased by a spring 4. After heating and exposing it to a reduced pressure atmosphere for a certain period of time, cell 1
The injection port is immersed in the liquid crystal placed in the vacuum container, and the inside of the vacuum container is returned to normal pressure, and the liquid crystal is injected between the substrates using the pressure difference between the inside and outside of the cell. Take it out from the vacuum container, and apply a dot of ultraviolet curable resin to the injection port using a dispenser or the like. (During this time, it was always 40
The temperature is maintained at ~50°C. ) Then, leave it at room temperature for a certain period of time, take advantage of the volumetric contraction of the liquid crystal due to the temperature difference, and inhale a certain amount of ultraviolet curing beet into the injection port.
The ultraviolet curable resin is cured by irradiation with ultraviolet rays, and the injection port is sealed.

In this method, pressure is applied to the cell 1 when injecting the liquid crystal into the cell 1 and when sealing the injection port in order to regulate the cell gap and obtain good gap accuracy. If a plurality of cells 1 are simply superimposed on each other, good gap accuracy may not be obtained due to the unevenness of the cells 1. Therefore, by inserting a plate-shaped spacer plate 6 in each cell as shown in FIG. 9, a uniform load is applied to the entire surface of all cells 1, and a liquid crystal panel with good gap accuracy can be obtained.

Problems to be Solved by the Invention However, the above method has the following problems. In other words, when pressurizing cell 1, a plurality of cells 1.1
The number of spacer plates 6 inserted between the cells must be equal to or greater than the number of cells, and it is very difficult to install the spacer plates 6 and the cells 1 alternately in the injection jig 5 equipped with a pressurizing mechanism. It is complicated and often damages the cell 1 or generates dust during these installations.Also, if a foreign object gets caught between the cell 1 and the spacer plate 6, the gap in that area becomes smaller, making it difficult to obtain good gap accuracy. I won't be able to do it. Therefore, it is necessary to clean the spacer plates 6 every time, but there are many spacer plates,
This was also very complicated and greatly hindered productivity.

Means for Solving the Problems In order to solve the above problems, the present invention applies pressure between a spacer plate to a cell made by bonding two substrates together, and injects liquid crystal from a liquid crystal injection port provided in the cell. A method for manufacturing a liquid crystal panel in which adhesive is applied to an injection port and cured,
The feature is that cells are inserted between mutually connected spacer plates and multiple cells are pressurized at the same time.

According to the present invention, since connected spacer plates are used, it is easy to install the spacer plate and the cell in a liquid crystal injection jig equipped with a pressurizing mechanism, and the spacer plate can also be easily cleaned. This can greatly improve productivity.

Example An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a spacer plate according to a first embodiment of the present invention, and FIG. 2 shows a spacer plate according to a first embodiment of the present invention in which this spacer plate is incorporated into an injection jig together with a cell made by bonding two substrates. Embodiment 1 is shown in FIG. 1, which shows a spacer plate 6 made of aluminum with good flatness and a connecting sheet 7 made of fluoro rubber.
This is made by gluing and connecting multiple spacer plates.

Next, the procedure for assembling the spacer plate 6 and the cell 1 into the injection jig 5 and the method for making the panel will be described. First, −
The spacer plates 6, in which one more sheet than the number of cells to be injected at a time, are connected together, are washed with fluorocarbon or the like, and after drying, the connected sheet 7 is folded and placed in the injection jig 5. At this time, a wedge-shaped gap is created between the spacer plates due to the rigidity of the rubber of the connecting sheet 7, and the cells 1 are inserted one by one into this gap, aligned in a predetermined direction.゜5k
A plurality of cells 1 and spacer plates 6 can be easily assembled as shown in FIG. 2 by applying a pressure of about gf/cm2 to 0 or more. In this state, the injection jig 5 is heated to 40 to 50"C in a vacuum container, and after being exposed to a reduced pressure atmosphere for a certain period of time, the injection port of the cell 1 is connected to the liquid crystal display installed in the vacuum container. The liquid crystal is injected between the substrates by the pressure difference inside and outside the cell by returning the inside of the vacuum container to normal pressure. Next, the injection jig 5 is taken out from the vacuum container.
Using a dispenser or the like, apply a dot of ultraviolet curable resin to multiple injection ports. (During this period, it is always maintained at 40 to 50°C.) After that, it is left at room temperature for a certain period of time, and a certain amount of ultraviolet curable resin is sucked into the injection port by taking advantage of the volumetric contraction of the liquid crystal due to the temperature difference. Then, the ultraviolet curing resin is cured by irradiation with ultraviolet rays, and the injection port is sealed. Thereafter, the pressure on the injection jig 5 is released, and the plurality of cells 1 are taken out together with the spacer plate 6.

By the above procedure, a plurality of liquid crystal panels with good gap accuracy can be simultaneously produced. In addition, spacer 6
The plate may be cleaned by placing the spacer plate 6 in the injection jig 5 and cleaning it together with the injection jig 5 using fluorocarbon or the like. In this case, due to the rigidity of the rubber of the connecting sheet between the spacer plates 6, a wedge-shaped Since there is a gap, good cleaning can be performed.

Next, FIG. 3 shows a spacer plate of a second embodiment. The material of the spacer plate 16 is fluorine rubber with a hardness of about #60, and a plurality of spacer plates 16 and their connecting portions 17 are integrally molded, and the thickness of the spacer plates 16 is 4 mm, and the thickness of the connecting portion 17 is is set to 1 mm. By incorporating the spacer plate 16 into the injection jig 5 as in the first embodiment, injecting the liquid crystal, and sealing the injection port, it is possible to easily produce a plurality of liquid crystal panels at the same time. Furthermore, by making the spacer plate 16, especially its cell pressing portion, an elastic material, if the spacer plate 16
Even if a foreign object gets caught between cell 6 and cell 1, the elastic material dents and absorbs the concentrated stress generated at the foreign object, making it less likely that the gap will become smaller, resulting in more stability and better gap accuracy. It is possible to obtain a liquid crystal panel. In addition, since the spacer plate 16 is formed by integral molding, there is no need for adhesion, and it can be easily manufactured.

FIG. 4 shows a spacer plate of the third embodiment.

In this case, a plurality of holes 22 that are thicker and wider than the cell 1 are bored in a rectangular parallelepiped fluorine rubber 21 that is large enough to fit into an injection jig, and a spacer plate 26 is formed from the holes and the rubber between the holes. The rubber on both sides serves as a connecting portion 27. Note that the rubber thickness of the spacer plate 26 is 4 mm, and the rubber thickness of the connecting portion 27 is 1 m.
It was set as m. The cell 1 is inserted into the hole 22 for use, and assembly into the injection jig 5 and cleaning can be performed even more easily, and the spacer plate can also be manufactured easily.

FIG. 5 shows a spacer plate of a fourth embodiment.

For example, a thick clean paper 31 is folded into a bellows shape, and the overlapping part of the folded state is used as a spacer plate 36, and the cell 1 is inserted between them and assembled into the injection jig 5, and pressurized. be. With this method, the same effect as above can be obtained, and in addition, the spacer plate 3
Since the spacer 6 can be easily constructed from inexpensive materials, it can be disposable, and cleaning of the spacer plate 36 can be omitted.

Please note that the direction of the crease should not interfere with the injection process.
It does not matter if it is vertical or horizontal, and any material can be used as long as it has some degree of rigidity and flatness and has little degassing in a vacuum.

The manufacturing method described in detail of the invention allows a large number of cells to be easily set in the injection jig, and the spacer plate can be easily cleaned, making it possible to manufacture liquid crystal panels with excellent gap accuracy with high productivity. can be created.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a spacer plate used in the method for manufacturing a liquid crystal panel according to the first embodiment of the present invention, FIG. 2 is a perspective view of the spacer plate assembled together with cells into an injection jig, and FIG. 3 is a perspective view showing a spacer plate according to a second embodiment of the present invention, FIG. 4 is a perspective view showing a spacer plate according to a third embodiment of the present invention, and FIG. 5 is a perspective view showing a spacer plate according to a fourth embodiment of the present invention. 6 is a perspective view showing a pattern of a sealant applied on a general substrate, FIG. 7 is a perspective view showing a general hollow cell, and FIGS. 8 and 9 are conventional examples. FIG. 8 is a side view showing a state where the cell is assembled into the injection jig, and FIG. 9 is a perspective view showing another state where the cell is assembled into the injection jig. 1... Cell, 5... Injection jig, 6.16.26.3
6...Spacer plate, 7...Connection sheet, 7.17.
...Connection part. Name of agent: Patent attorney Shigetaka Awano

Claims (3)

[Claims] (1) Manufacture of a liquid crystal panel by pressurizing a cell made of two substrates pasted together between spacer plates, injecting liquid crystal through a liquid crystal injection port provided in the cell, and applying adhesive to the injection port and curing it. 1. A method for manufacturing a liquid crystal panel, the method comprising inserting cells between mutually connected spacer plates and pressurizing a plurality of cells at the same time. (2) A method for manufacturing a liquid crystal panel according to claim 1, characterized in that a spacer plate is used in which at least the portion that contacts the cells is made of an elastic material. (3) A method for manufacturing a liquid crystal panel according to claim 1, characterized in that a spacer plate having a bellows-like structure is used.