JPH05188387A - Production of liquid crystal panel - Google Patents

Abstract

PURPOSE:To provide a process for production of the liquid crystal panel which does not generate the crack and gap defect of substrates at the time of cutting the substrates. CONSTITUTION:A sealing part 4 and fixed sealing parts 6 provided by screen printing using a sealant consisting of a thermosetting adhesive and spacers are formed on an electrode substrate 1a, and auxiliary sealing parts 8 are formed on external terminals 7 facing apertures 3. Tentative fixing parts 9 consisting of a UV-curing type adhesive and conductive paint 10 are then formed on another electrode substrate 1b after dispersion of the spacers. The electrode substrates 1a, 1b are superposed and stuck to each other and right thereafter, the tentative fixing parts 9 are irradiated with UV rays. Two sheets of the electrode substrates 1a, 1b are then adhered and fixed. While the electrode substrates 1a, 1b made into one sheet of the substrate are kept uniformly pressed, the sealing part, fixed sealing parts 6 and auxiliary sealing parts 8 consisting of the UV curing type adhesive are thermally cured. The surplus length part 5 of a pair of the electrode substrates 1a, 1b subjected to the curing stage of the sealant is disconnected from a cutting line 11 by scribing and breaking.

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 panels containing the shape of a sealant.

[0002]

2. Description of the Related Art In recent years, liquid crystal panels are rapidly increasing in size and definition as displays for OA and workstations. Therefore, there is an urgent need to establish a manufacturing method for mass production and stabilization of quality of large liquid crystal panels.

Here, the shape and manufacturing method of the seal member in manufacturing a conventional large-sized liquid crystal panel are shown in FIG.
Will be explained.

After the alignment film is formed and the alignment treatment is performed on the electrode side of the electrode substrate 1a having the electrode portion 2 and the extra length portion 5 outside the electrode portion 2, the opening portion 3 serving as a liquid crystal injection port is formed by screen printing.
The seal portion 4 composed of a thermosetting adhesive partially provided with and a rod-shaped spacer is formed by printing.

Next, a spherical spacer is formed on the electrode substrate 1a or the other electrode substrate which is superposed on the electrode substrate 1a, and then a temporary fixing agent 9 made of an ultraviolet curable adhesive and a conductive paint 10 are applied by a dispenser to form electrodes. The substrate 1a and the other electrode substrate are overlaid and the positioning and bonding are performed.

After the positioning and bonding is completed, the temporary fixing agent 9 is cured by irradiation of ultraviolet rays to prevent positional displacement and fixing of the extra length portion, press-hardening of the sealant, separation of the extra length portion, liquid crystal injection and the like. It is advanced to the subsequent process.

[0007]

However, the above conventional manufacturing method has the following problems.

First, the sealant is pressed and heated to cure, and the extra length is cut off in order to make the pair of electrode substrates have a desired panel size. In this method, a scratch is made on the surface of the substrate (hereinafter referred to as scribe), and the opposite surface of the scratch is given a shock to break the substrate (hereinafter referred to as break). One electrode substrate is broken. At this time, the extra length is fixed by curing the temporary fixing agent made of an ultraviolet curing adhesive, but when one of the electrode substrates is broken, a crack occurs and at the same time, the temporary impact agent and the electrode substrate are broken by a break impact. Peels off.

As the factors of peeling, the area of the temporary fixing portion is small, the ultraviolet energy is lowered due to the contamination of the electrode substrate, the influence of the multilayer film, etc., so that a sufficient fixing force cannot be obtained. Is destroyed.

Further, since the extra length is cut off by the peeling, the electrode terminal is damaged, and further, when the other electrode substrate is scribed and broken, it is necessary to attach the cut off extra length. Workability is reduced.

Next, after sticking the two electrode substrates together, the sealant is pressed and cured. At this time, stress concentration occurs in the discontinuous portion at the opening of the seal portion of the pair of electrode substrates, and the display is performed. A defective gap locally occurs in the area, which deteriorates the display quality.

Further, the formation of the temporary fixing agent made of an ultraviolet curable adhesive is performed by dispenser coating in the positioning and laminating process, but the process time is extended by the coating time and the productivity is lowered.

As described above, the conventional manufacturing method has reduced productivity and quality.

[0014]

In order to solve the above problems, a method of manufacturing a liquid crystal panel according to the present invention is directed to two electrode substrates having an electrode portion, an external terminal, and an extra length portion outside the external terminal. In the manufacturing method of forming a seal part made of a thermosetting adhesive on at least one outer circumference of the electrode part and having an opening in a part thereof, and adhering and fixing it by sandwiching a spacer, cutting of the extra length part and the electrode substrate The manufacturing method is characterized in that a fixed seal portion made of a thermosetting adhesive is formed at a position not intersecting the line.

In particular, in the above structure, an auxiliary member having a length that is approximately the same as the width of the opening or more than the width of the opening is provided in the extra length portion near the external terminal of the substrate facing the opening of the seal portion. Two electrode substrates are formed by forming a seal portion or by forming a line-shaped or multi-point UV curable adhesive by a screen printing method at a position that is an extra length and does not intersect the cutting line of the electrode substrate. After the step of positioning and laminating, it is preferable that the ultraviolet curable adhesive in the extra length portion is ultraviolet cured.

[0016]

The technical operation of the present invention will be described.

First, a fixed seal portion made of a thermosetting adhesive is formed in the extra length portion, and the two electrode substrates are heated and cured for a predetermined time while applying a uniform pressing force so as to obtain a desired adhesive strength. To do. Therefore, since the two electrode substrates are held in parallel while having a gap corresponding to the thickness of the spacers, thermosetting proceeds with a certain adhesive layer and a firm fixation is obtained, and the adhesive portion is not affected by the break impact of the extra length portion. Withstands without peeling.

Next, by forming an auxiliary seal portion in the extra length portion near the external terminal of the electrode substrate so as to face the opening portion of the seal portion, even if the two electrode substrates are bonded and heat-cured. The stress concentration on the opening is relaxed by the seal portion provided in the extra length portion near the external terminal and does not affect the gap to the display area.

Further, if a process of printing a UV-curable adhesive in a linear or multi-point form by screen printing on the extra length portion is used, the process time is shortened and the adhesive is linear or multi-point form. As a result, the adhesive area is increased, and even the ultraviolet curable adhesive can withstand break impact.

[0020]

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

In FIG. 1, a sealant composed of an epoxy thermosetting adhesive and a rod-shaped glass spacer is screen-printed on the electrode substrate 1a on which the alignment film has been formed on the display surface and the alignment treatment has been performed in advance. A seal portion 4 provided with an opening 3 serving as a liquid crystal injection port on the outer periphery of the same, and a seal portion 4 provided in the extra length portion 5 in the vicinity of the fixed seal portion 6 and the opening portion 3 in proximity to the external terminal 7. Auxiliary seal portion 8 having a width of
To form.

Then, as shown in FIG. 2, spherical spacers 12 are formed on the electrode substrate 1a or the other electrode substrate 1b which is superposed on the electrode substrate 1a by a dispersion method, and then a plate stopper made of an ultraviolet curing adhesive is applied by dispenser coating. Part 9 (Fig. 1)
And conductive paint 10 (FIG. 1) is formed.

Then, the spherical spacer 12, the plate stopper 9,
Electrode substrates 1a and 1b so as to sandwich the conductive paint 10
Immediately after that, the temporary fixing portion 9 is irradiated with ultraviolet rays to bond and fix the two electrode substrates 1a and 1b to prevent positional deviation.

Next, the electrode substrate 1a, which has become a pair of substrates,
1b is a vacuum packing or a mechanical pressing method, and while uniformly pressing the electrode substrates 1a and 1b, a sealing portion 4, a fixed sealing portion 6, and an auxiliary sealing portion 8 made of a thermosetting adhesive.
Is cured by heating at 150 ° C. for 1 hour, for example. At this time, since the adhesive layer of the fixing portion 6 is cured in a constant state, the electrode substrate 1
a and 1b are firmly bonded. Further, the auxiliary seal portion 8 provided so as to face the opening portion 3 relaxes the pressure concentrated in the opening portion 3 and stably maintains the gap in the vicinity of the opening portion 3 when the sealant is pressed and heated and cured.

Then, the extra length portion 5 of the pair of electrode substrates 1a and 1b after the curing step of the sealant is separated from the cutting line 11 by scribing and breaking.

The scribe and break are shown in FIG.
First, as shown in (b) and (c), the electrode substrate 1a is scribed and broken along the cutting line to insert the crack 13a, and then the electrode substrate 1b is inserted into the crack 13b to separate the pair of extra length portions 14 from each other. Complete the empty panel. After that, the liquid crystal panel is completed by completing the processes such as liquid crystal injection and injection port sealing on the empty panel.

As described above, when the fixed seal portion and the auxiliary seal portion are provided in the extra length portion of the electrode substrate, the productivity and the display quality can be stably improved.

When the fixed seal portion 6 provided in the extra length portion 5 in FIG. 1 is formed by screen printing using an ultraviolet-curing adhesive, the adhesive area is increased and the adhesive strength is improved. At the same time, since the adhesive is formed by the printing method, the process time is shortened as compared with the conventional dispenser application.
Regarding the printing of the fixed seal portion 6 made of the ultraviolet curable adhesive and the seal portion 4 made of the thermosetting adhesive, it is difficult to print and form on one electrode substrate, and therefore, a method of forming and printing on each of two substrates. There is.

[0029]

As described above, according to the present invention, the display quality of a liquid crystal panel is stabilized by a relatively easy manufacturing method in which a thermosetting adhesive or an ultraviolet curing adhesive is printed on the extra length portion by screen printing. In addition to improving productivity, it can be provided to the market in large quantities for displays such as OA and workstations.

[Brief description of drawings]

FIG. 1 is a plan view of a liquid crystal electrode substrate according to an embodiment of the present invention.

FIG. 2 is a sectional view of a liquid crystal electrode substrate in the example.

FIG. 3 is a sectional view showing a step of cutting a substrate in the example.

FIG. 4 is a plan view of a liquid crystal electrode substrate in a conventional manufacturing method.

[Explanation of symbols]

 1a, 1b Electrode substrate 2 Electrode part 3 Opening part 4 Seal part 5 Extra length part 6 Fixed seal part 7 External terminal 8 Auxiliary seal part 9 Temporary fixing part 10 Conductive paint 11 Cutting line 12 Spherical spacers 13a, 13b Crack 14 A pair of extra parts Long section

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norihiro Minamiide 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. An electrode part, an external terminal, and two electrode substrates having an extra length outside the external terminal, at least one of the electrode parts having a thermosetting adhesive on the outer periphery of the electrode part, and an opening part provided in a part thereof. In a manufacturing method of forming a seal part and adhering and fixing it with a spacer interposed, a fixed seal part made of a thermosetting adhesive is formed at a position that does not intersect the cutting line of the electrode substrate in the extra length part. Manufacturing method of liquid crystal panel. 2. An auxiliary seal portion having a length approximately equal to or greater than the width of the opening is formed in an extra length portion near the external terminal of the substrate so as to face the opening of the sealing portion. The method for manufacturing a liquid crystal panel according to claim 1, wherein 3. A line-shaped or multi-point UV curable adhesive is formed by screen printing at a position that does not intersect the cutting line of the electrode substrate in the extra length portion, and the two electrode substrates are positioned and bonded together. The method for producing a liquid crystal panel according to claim 1, wherein the ultraviolet curable adhesive in the extra length portion is cured by ultraviolet light after the step.