JPH04366818A - Production of liquid crystal display panel - Google Patents

Abstract

PURPOSE:To provide the process for producing the liquid crystal display panel which can remove ionic impurities at the time of injection in the production of the liquid crystal display panel to be built into a display device, etc. CONSTITUTION:This liquid crystal display panel is constituted by injecting a liquid crystal 2 through a liquid crystal injection port 13 provided on an outer peripheral sealing material 12 into the inside space of a cell 4 formed by sticking the peripheral edges of two sheets of glass substrates 41 via the outer peripheral sealing material 12 to each other. The above-mentioned liquid crystal display panel is produced by previously providing an auxiliary electrode 42 so as to hold the liquid crystal injection port 13 on the outer side of the liquid crystal injection port 13 of the cell 4, injecting the liquid crystal 2 into the cell 4 through the liquid crystal injection port 13 under impression of a voltage to the auxiliary electrode 42, removing at least the region formed with the auxiliary electrode 42 from the glass substrates 41 constituting the cell 4, and sealing the opened liquid crystal injection port 13.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the manufacture of liquid crystal display panels to be incorporated into display devices, and more particularly to a method of manufacturing a liquid crystal display panel that makes it possible to remove ionic impurities mixed in liquid crystal.

In addition to nonionic impurities such as fine dust, liquid crystals contain ionic impurities.
In a liquid crystal display panel in which electrodes are opposed to each other via a liquid crystal and a voltage is applied between the electrodes, if a large amount of ionic impurities are mixed in the liquid crystal, the internal resistance between the electrodes decreases and the display quality deteriorates.

[0003] Most of the nonionic impurities such as dust are removed by purification and do not increase thereafter.
Even if ionic impurities are removed by purification, they may increase again during storage. Therefore, there is a need to develop a method for manufacturing a liquid crystal display panel that can remove ionic impurities during implantation.

0004

2. Description of the Related Art FIG. 2 is a diagram showing a conventional method of manufacturing a liquid crystal display panel. The conventional liquid crystal display panel is shown in Figure 2(a).
As shown in the figure, a cell 1 is composed of two glass substrates 11 and a peripheral sealing material 12, and a cell 1 is formed by pasting the peripheral edges of the two glass substrates 11 together with the peripheral sealing material 12 interposed therebetween. The liquid crystal 2 is injected through a liquid crystal injection port 13 provided in a part of the outer peripheral sealing material 12 .

The apparatus 3 for injecting the liquid crystal 2 into the cell 1 is shown in FIG.
b) An injection jig 32 and a jig support frame 33 for mounting one or more cells 1 with the liquid crystal injection port 13 facing down in the internal space surrounded by the partition wall 31 as shown in FIG. A liquid crystal tray 34 arranged below and storing liquid crystal 2
It is equipped with a table 35 that moves up and down.

FIG. 2 (
b) With the liquid crystal pan 34 lowered as shown in FIG. Make the inside of 31 a vacuum state. By bringing the inside of the partition wall 31 into a vacuum state, the inside of the cell 1 is also brought into a vacuum state.

Next, as shown in FIG. 2(c), the liquid crystal pan 34
is raised to immerse the liquid crystal inlet 13 of the cell 1 into the liquid crystal 2, and at the same time, gas is sent into the partition wall 31 to raise the pressure in the internal space to a predetermined level. By increasing the pressure inside the partition wall 31, the liquid crystal 2 is pressurized and the liquid crystal inlet 1 is
3 into the interior of cell 1.

[0008]

[Problems to be Solved by the Invention] However, the conventional manufacturing method for liquid crystal display panels does not have a function to remove ionic impurities from the liquid crystal during injection, and it has been found that many ionic impurities are mixed into the liquid crystal. There was a problem in that internal resistance decreased and display quality deteriorated.

An object of the present invention is to provide a method for manufacturing a liquid crystal display panel that can remove ionic impurities during implantation.

0010

[Means for Solving the Problems] FIG. 1 is a diagram showing a method of manufacturing a liquid crystal display panel according to the present invention. The same objects are represented by the same symbols throughout the figures.

The above problem is solved by injecting the liquid crystal 2 into the inner space of the cell 4, which is formed by pasting the peripheral edges of two glass substrates 41 together with the outer sealing material 12 in between, through the liquid crystal injection port 13 provided in the outer sealing material 12. In manufacturing a liquid crystal display panel to be injected, an auxiliary electrode 42 is provided in advance on the outside of the liquid crystal inlet 13 of the cell 4 so as to sandwich the liquid crystal inlet 13, and while a voltage is applied to the auxiliary electrode 42, the cell is inserted through the liquid crystal inlet 13. In the liquid crystal display panel of the present invention, the liquid crystal 2 is injected into the cell 4, the region where at least the auxiliary electrode 42 is formed is cut out from the glass substrate 41 constituting the cell 4, and the open liquid crystal injection port 13 is further sealed. This is achieved by the manufacturing method.

0012

[Operation] In Figure 1, an auxiliary electrode is provided in advance on the outside of the liquid crystal injection port of the cell so as to sandwich the liquid crystal injection port, and by injecting liquid crystal into the cell through the liquid crystal injection port while applying a voltage to the auxiliary electrode, the liquid crystal The ionic impurities mixed therein are concentrated near the auxiliary electrode and are not injected into the cell. Moreover, by cutting out at least the region where the auxiliary electrode is formed from the glass substrate constituting the cell and sealing the liquid crystal injection port, the function of the liquid crystal display panel is not impaired. That is, it is possible to realize a method for manufacturing a liquid crystal display panel that can remove ionic impurities during implantation.

[0013]

[Embodiment] An embodiment of the present invention will be described below with reference to FIG. In the liquid crystal display panel according to the present invention shown in FIG. 1(a), a cell 4 is constituted by two glass substrates 41 and a peripheral sealing material 12, and the peripheral edges of the two glass substrates 41 are connected via the peripheral sealing material 12. The liquid crystal 2 is injected into the inner space of the cell 4 formed by pasting them together through a liquid crystal injection port 13 provided in advance in a part of the outer peripheral sealing material 12.

Furthermore, unlike cells in conventional liquid crystal display panels, in the cell 4 of the liquid crystal display panel according to the present invention, at least one of the two glass substrates 41 is provided with an auxiliary electrode forming region 43 outside the liquid crystal injection port 13. LCD inlet 1
At least a pair of auxiliary electrodes 42 are formed on the outside of the liquid crystal injection port 3, sandwiching the liquid crystal injection port 13 therebetween.

FIG. 1 (
b) With the liquid crystal pan 34 lowered as shown in FIG. Make the inside of 31 a vacuum state. By bringing the inside of the partition wall 31 into a vacuum state, the inside of the cell 4 is also brought into a vacuum state.

Next, as shown in FIG. 1(c), the liquid crystal pan 34
is raised to immerse the liquid crystal inlet 13 of the cell 4 into the liquid crystal 2, and at the same time, gas is sent into the partition wall 31 to raise the pressure in the internal space to a predetermined level. By increasing the pressure inside the partition wall 31, the liquid crystal 2 is pressurized and the liquid crystal inlet 1 is
3 into the interior of the cell 4.

A DC voltage of 10 V is applied to the auxiliary electrode 42 of the cell 4 formed by vapor-depositing aluminum, and the auxiliary electrode 42 is applied to the liquid crystal 2 in the liquid crystal pan 34 together with the liquid crystal injection port 13 of the cell 4. The ionic impurities mixed in the liquid crystal are removed by dipping the auxiliary electrode 4.
It concentrates near cell 2 and is not injected into cell 4.

In FIG. 1, there is a liquid crystal injection port 1 approximately in the center.
3 is installed on the injection jig 32 almost perpendicularly, but the cell 4 with the liquid crystal injection port 13 provided on one side is installed diagonally on the injection jig 32. By storing the liquid crystal 2 in the liquid crystal pan 34 whose bottom surface is bent at right angles and forming a V shape, the amount of liquid crystal 2 stored in the liquid crystal pan 34 can be reduced when the cell 4 becomes larger. Even in that case, the effect of the auxiliary electrode 42 provided outside the liquid crystal injection port 13 of the cell 4 remains unchanged.

As shown in FIG. 1A, the cell 4 of the liquid crystal display panel according to the present invention differs from the conventional liquid crystal display panel cell in that it has an auxiliary electrode forming area 43 at least on the side where the liquid crystal injection port 13 is provided. If left as is, problems may occur when sealing the liquid crystal injection port 13 or connecting a drive circuit.

However, after the liquid crystal display panel injected with the liquid crystal is taken out from the partition wall 31, as shown in FIG. By cutting out the liquid crystal injection port and sealing the liquid crystal injection port with the sealing material 44, the function of the liquid crystal display panel is not impaired.

In this way, an auxiliary electrode is provided in advance on the outside of the liquid crystal injection port of the cell so as to sandwich the liquid crystal injection port, and by injecting liquid crystal into the cell through the liquid crystal injection port while applying a voltage to the auxiliary electrode, the liquid crystal is injected into the cell. The ionic impurities mixed therein are concentrated near the auxiliary electrode and are not injected into the cell. Moreover, by cutting out at least the region where the auxiliary electrode is formed from the glass substrate constituting the cell and sealing the liquid crystal injection port, the function of the liquid crystal display panel is not impaired. That is, it is possible to realize a method for manufacturing a liquid crystal display panel that can remove ionic impurities during implantation.

[0022]

As described above, according to the present invention, it is possible to provide a method for manufacturing a liquid crystal display panel in which ionic impurities can be removed during implantation.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a method for manufacturing a liquid crystal display panel according to the present invention.

FIG. 2 is a diagram showing a conventional method for manufacturing a liquid crystal display panel.

[Explanation of symbols]

Claims (1)

[Claims] 1. A cell (
In manufacturing a liquid crystal display panel in which liquid crystal (2) is injected into the internal space of the cell (4) through the liquid crystal injection port (13) provided in the outer sealing material (12), the liquid crystal (2) is injected into the internal space of the cell (4) in advance.
) outside the liquid crystal injection port (13).
) is provided between the auxiliary electrodes (42), and while applying a voltage to the auxiliary electrodes (42), the liquid crystal injection port (13
) inject the liquid crystal (2) into the cell (4),
At least a region where the auxiliary electrode (42) is formed is cut out from the glass substrate (41) constituting the cell (4), and the open liquid crystal injection port (13) is further sealed. Features: Manufacturing method for liquid crystal display panels.