JPH08194198A - Production of liquid crystal display element - Google Patents

Abstract

PURPOSE: To prevent the defective connection at an electrical connection with a simple structure. CONSTITUTION: A cell forming sealing part 2 is adhered to the inside of the two glass substrates 1 and 1' opposed to each other with a slight clearance in between to form a cell. A light or the liq. mixture of a thermosetting resin component and a liq. crystal component is injected into a cell 3 formed by the sealing part 2 and substrates 1 and 1' by vacuum injection, light or heat is applied to the liq. mixture injected into the cell 3 to polymerize and cure the resin component in the liq. mixture, and a liq. crystal display element is produced. A sealing part forming stage is provided before the liq. mixture injecting stage. Another sealing part 2' is adhered to the substrates 1 and 1' so that the electrical connection 4 to be connected to the external part formed outside the cell 3 is not exposed to the liq. mixture when the liq. mixture is injected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a liquid crystal display element, and more particularly to a method for producing a liquid crystal display element suitable for producing a polymer dispersion type liquid crystal display element.

[0002]

2. Description of the Related Art In a conventional liquid crystal display device manufacturing method, two liquid crystal display devices are opposed to each other with a small gap (for example, about 5 μm).
Liquid crystal is injected by a vacuum injection method into a cell formed by the cell forming seal portion and two glass substrates, in which a cell forming seal portion adhered to the inside of one glass substrate is formed. Liquid crystal injection process (for example, Japanese Patent Publication Sho 60
See Japanese Patent Publication No. 49889. ) And a process including.

Such a manufacturing method can also be applied as a method for manufacturing a polymer dispersion type liquid crystal display element other than a normal liquid crystal display element.

[0004]

However, it has been found that the following problems occur when the above manufacturing method is used as it is for manufacturing a polymer dispersion type liquid crystal display device.

That is, in the case of manufacturing a normal liquid crystal display element, liquid crystal is injected into the cell by a vacuum injection method. However, in manufacturing a polymer dispersion type liquid crystal display element, light is used instead of liquid crystal. Alternatively, it is necessary to inject a mixed liquid of a thermosetting resin component and a liquid crystal component into the cell by a vacuum injection method, and further, light or heat is applied to the mixed liquid injected into the cell to form a resin component in the mixed liquid. A resin curing step for polymerizing and curing the is required separately.

Then, when the mixed solution is injected into the cell by a vacuum injection method, the mixed solution rises through a slight gap between the two glass substrates due to a capillary phenomenon, and external parts (for example, external parts) formed outside the cell are formed. , Lead wires, driver ICs, etc.), the mixed solution adheres to the electrical connection part, and in the resin curing step, the mixed solution adhered to the electrical connection part cures, and external components are soldered to the electrical connection part by soldering or the like. When connecting, poor connection is likely to occur.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide a method of manufacturing a liquid crystal display device capable of preventing a defective connection at an electrical connection portion with a simple structure.

[0008]

According to a first aspect of the present invention, there is provided a cell forming step of forming a cell forming seal portion adhered to the inside of two glass substrates facing each other with a slight gap therebetween.
A mixed solution injection step of injecting a mixed solution of a light or thermosetting resin component and a liquid crystal component into a cell formed by the cell forming seal portion and the two glass substrates by a vacuum injection method; A method for producing a liquid crystal display device, comprising: a resin curing step of applying light or heat to the mixed solution injected into the cell to polymerize and cure the resin component in the mixed solution, wherein the mixed solution injection step Prior to the step of forming a seal portion, wherein the seal portion forming step is performed such that an electrical connection portion formed on the outside of the cell and connected to an external component is exposed to the mixed solution during the mixed solution injection step. The above 2
A method for manufacturing a liquid crystal display element is adopted, which is configured to form another seal portion adhered to a glass substrate.

[0009]

In the mixed liquid injecting step, since the electric connecting portion is not exposed to the mixed liquid by the other sealing portion, it is possible to prevent the mixed liquid from adhering to the electric connecting portion. For this reason, since the mixed liquid does not adhere to the electric connection portion, the cured product of the mixed liquid does not adhere to the electric connection portion during the subsequent resin curing step, and therefore external parts are soldered to the electric connection portion, etc. Due to this, a poor connection does not occur when connecting.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

A method of manufacturing a liquid crystal display device according to one embodiment comprises a cell forming step, a seal portion forming step, a mixed liquid injecting step, a resin curing step, a seal portion removing step, and an external component connecting step.

In the cell forming process, as shown in FIG. 1, two glass substrates 1 facing each other with a slight gap therebetween.
The cell forming seal portion 2 bonded to the inside of 1'is formed. Here, a liquid crystal driving electronic circuit, a color display filter, and the like are formed on the glass substrates 1 and 1 '. Further, the cell forming seal portion 2 is made of an epoxy resin or the like having excellent airtightness, and a small gap (for example, 5 μm) between the two glass substrates 1 and 1 ′ is formed by an electrically insulating spacer.
m), and then the two glass substrates 1 and 1'are bonded. The method for curing the cell forming seal portion 2 is: light, heat, 2
Any method such as liquid mixing may be used.

In the step of forming the seal portion, external parts (for example, lead wires and driver ICs) formed outside the cell 3 are formed.
Etc.) is adhered to the two glass substrates 1 and 1 ′ so as to surround the electric connection portion 4 so that the electric connection portion 4 connected to the electric connection portion 4 is not exposed to the mixed liquid in the subsequent mixed liquid injection step. To form a seal portion 2 '. It is desirable that this step be performed at the same time as the cell forming step. Moreover, a lead wire, a driver IC, or the like is then soldered to the electrical connection portion 4.

In the mixed liquid injecting step, a light or thermosetting resin component is introduced into the cell 3 formed by the cell forming seal portion 2 and the two glass substrates 1 and 1'through the injection port 3 '. A mixed solution of a liquid crystal component and a liquid crystal component is injected by a vacuum injection method. During this step, the other seal portion 2'is formed so that the electrical connection portion 4 is not exposed to the mixed liquid as described above.
The mixed liquid does not adhere to the electrical connection portion 4.

In the resin curing step, light or heat is applied to the mixed solution injected into the cell 3 to polymerize and cure the resin component in the mixed solution. At this step, since the mixed liquid does not adhere to the electric connection portion 4 as described above, the mixed liquid adhered to the electric connection portion 4 does not polymerize and cure as in the conventional case.

In the step of removing the seal portion, as shown in FIG. 2, the glass substrates 1, 1'are cut along the cutting line shown by the broken line in the drawing.
Is cut, and the other seal portion 2'is removed. At the time of this disconnection,
Since the cured product of the mixed liquid does not adhere to the glass substrates 1 and 1'in the vicinity of the electrical connection portion 4, the glass substrates 1 and 1'can be easily and cleanly cut.

In the external component connecting step, the electric connecting portion 4 is
Solder external components such as lead wires or driver ICs. In this step, since the polymer of the mixed liquid does not adhere to the electrical connection portion 4, soldering or the like can be favorably performed, and poor contact is less likely to occur.

As described above, in the mixed liquid injecting step, the electric connection portion 4 is not exposed to the mixed liquid by the other seal portion 2 ', so that the mixed liquid can be prevented from adhering to the electric connection portion 4. For this reason, since the mixed liquid does not adhere to the electrical connecting portion 4, the electrical connecting portion 4 is not to be attached during the subsequent resin curing step.
The cured product of the mixed liquid does not adhere to the
When connecting external parts to the board by soldering or the like, no connection failure occurs.

[Brief description of drawings]

FIG. 1 shows a structure in the middle of manufacturing a liquid crystal display device manufactured by a method for manufacturing a liquid crystal display device according to an embodiment.
(A) is a plan view thereof, and FIG. 1 (B) is BB shown in FIG. 1 (A).
Cross section

FIG. 2 is a cross-sectional view of an essential part for explaining a seal part removing step.

[Explanation of symbols]

 1, 1'Glass substrate 2 Seal part 2'Other seal part 3 Cell 4 Electrical connection part

Claims (1)

[Claims] 1. A cell forming step of forming a cell-forming seal portion adhered to the inside of two glass substrates facing each other with a slight gap therebetween, and the cell-forming seal portion and the two glass substrates. In the formed cell, a mixed solution injection step of injecting a mixed solution of a light or thermosetting resin component and a liquid crystal component by a vacuum injection method, and applying light or heat to the mixed solution injected into the cell ,
A method of manufacturing a liquid crystal display device, comprising: a resin curing step of polymerizing and curing the resin component in the mixed liquid; and a step of forming a seal portion before the mixed liquid injection step, wherein the seal portion forming step is Another seal adhered to the two glass substrates so that an electric connection portion formed on the outside of the cell and connected to an external component is not exposed to the mixed liquid during the mixed liquid injection step. A method for manufacturing a liquid crystal display element, which is configured to form a portion.