JP2989052B2 - Liquid crystal display panel manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a liquid crystal display panel, and more particularly to a method for aligning and bonding two glass substrates having electrode patterns formed thereon.

[0002]

2. Description of the Related Art At present, a plurality of liquid crystal panels are formed on one large substrate in consideration of mass productivity. In the following description, one large substrate, for example, 30 cm
An example in which 80 liquid crystal panels are formed on a glass substrate having a size of 30 cm will be described.

[0003] A method of positioning and bonding large substrates in a conventional example will be described with reference to FIG. FIG.
FIG. 3 is a perspective view showing a method for manufacturing a liquid crystal display panel in a conventional example.

First, a black matrix is formed on a first large-sized substrate 11 made of a glass substrate by using a metal material or the like, and a multi-layered film such as a color filter and a protective film is formed thereon. On the other hand, an active element or the like is formed on a second large substrate 12 made of a glass substrate by using a metal material. A fine electrode pattern (not shown) is provided on the first large substrate 11 and the second large substrate 12.
Are formed, and 80 liquid crystal panels are formed.

In FIG. 2, a first large substrate 11 and a second large substrate
When the large substrate 12 is superposed, an electrode pattern can be formed with high accuracy in the exposure, development, and etching processes.

However, when a sealing material (not shown) is formed on the liquid crystal panel 17 formed on the large-sized substrate, and the first large-sized substrate 11 and the second large-sized substrate 12 are overlapped, the warpage of the glass substrate itself is reduced. For this reason, the glass substrates around the large substrate are slightly separated from each other. As a result, it is difficult to align the alignment marks 13 of the two large substrates at the time of the alignment operation, so that a high-accuracy overlay accuracy cannot be obtained.

[0007] Further, as shown in FIG.
When the liquid crystal panel 17 is pressurized using a press machine and simultaneously heated to cure the sealing material, the gap size between the glass substrates becomes non-uniform. . As a result, superposition on a large substrate cannot be performed.

For this reason, conventionally, a large substrate is cut into small liquid crystal panel sizes one by one, a sealing material is formed, and two glass substrates are aligned and overlapped. A method of forming a liquid crystal panel has been adopted.

[0009]

When manufacturing a liquid crystal viewfinder having a high-definition electrode pattern or a liquid crystal panel typified by a liquid crystal projection corresponding to high definition, a transparent electrode film formed on a glass substrate is used. The pitch of the electrode pattern is as small as 30 μm or less.

For this reason, when a liquid crystal panel is formed by laminating two glass substrates, it is necessary to attach a glass substrate that causes a slight deviation in exposure accuracy from the beginning due to deflection of the material of the glass substrates. . In addition, even if two glass substrates are not misaligned, if they are bonded using a sealing material, the electrode formed on the two glass substrates in a large substrate due to the difference in the thermal expansion coefficient between the color filter and the protective film and the glass substrate. A pattern shift occurs.

An object of the present invention is to solve the above-mentioned problems and to achieve
It is an object of the present invention to provide a method for manufacturing a liquid crystal panel in which a positional shift of an electrode pattern formed on a single glass substrate does not occur.

[0012]

In order to solve the above-mentioned problems, a method of manufacturing a liquid crystal display panel according to the present invention is performed by the following method.

After forming the sealing material on the large substrate, the two large substrates are aligned in the first alignment,
Laminate and apply pressure from above and below. As a result, the sealing material is crushed, the contact area between the glass substrate and the sealing material increases, and the thixotropy increases. Therefore, the mutual positions of the two large substrates are difficult to move. In this state, the large substrate is cut into a predetermined size to form a substrate. Thereafter, the substrate is subjected to pressurization and heating at the same time using a hot press to soften the sealing material, perform a fine second alignment, and form electrode patterns on a plurality of liquid crystal panels formed on the substrate. Of each other can be corrected. After that, heat treatment of the substrate is performed to cure the sealant, and further, the substrate is cut to form a liquid crystal panel. Thus, mass production of a liquid crystal panel using a large substrate becomes possible.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing a liquid crystal display panel according to the present invention will be described below with reference to the drawings. 1 (a) to 1 (c)
It is a perspective view which shows the manufacturing method of the liquid crystal panel of this invention in order of a process.

First, as shown in FIG. 1A, a predetermined electrode pattern (not shown) is formed on each of the first substrates 11 among the large substrates on which 80 liquid crystal panels are formed. A sealing material (not shown) is formed by a printing method. This sealing material is made of an epoxy-based adhesive.

Further, an alignment mark 13 is formed on the first large substrate 11 and the second large substrate 12 simultaneously with the formation of the electrode pattern. In this embodiment, four substrates 14 are formed from a pair of large substrates, and 20 liquid crystal panels 17 are formed on each of the substrates 14. Therefore, the alignment marks 13 are formed at the four corners of the substrate 14 on which the twenty liquid crystal panels 17 are formed.
Therefore, a total of 16 alignment marks 13 are formed on a pair of large substrates.

Thereafter, the first large-sized substrate 11 and the second large-sized substrate 12 on which the sealing material is formed are subjected to a first alignment using the alignment marks 13 and are superposed.
At this time, the mutual positions of the electrode patterns formed on the two large substrates do not need to match with high accuracy.

Thereafter, two large substrates are pressed from above and below using a press machine. As a result, the sealing material is pressed and crushed, and the contact area between the sealing material and the glass substrate increases. For this reason, the two glass substrates are difficult to move with each other, and the mutual positions of the glass substrates do not change in the glass substrate cutting operation described in the next step.

Next, as shown in FIG. 1B, the superposed large substrates are cut and divided into substrates 14 having a size smaller than the large substrates, thereby forming four substrates 14. In the description of this embodiment, as described above, one liquid crystal panel 17 is formed on each of the substrates 14 formed by dividing one large substrate.

Thereafter, the substrate 14 is heated for 5 to 10 hours using a hot press machine 15 heated to 110 ° C.
Pressure is applied for 2 seconds to soften the sealing material, and fine alignment is performed using the alignment marks 13 formed at the four corners of the substrate 14.

The second alignment is performed with the substrate 14 having a size smaller than that of the large substrate. Therefore, unlike the alignment in the conventional method in the state of a large substrate, there is no warpage of the outer peripheral portion of the substrate, no positional displacement of the electrode pattern occurs, and high-accuracy alignment can be performed.

When the sealing material is pressurized simultaneously with heating,
The viscosity of the sealing material is reduced, and the second alignment, which is an operation for positioning the substrate 14, can be easily performed.

Thereafter, the four corners of the substrate 14 are
And then heat treatment is performed to cure the sealing material. The reason why the substrate 14 is temporarily fixed by using the instantaneous adhesive 16 is to prevent the displacement of the electrode pattern formed on the substrate 14 due to the softening of the sealing material when the sealing material is cured.

After the sealing material is cured, the substrate 14 is cut. As a result, 20 liquid crystal panels 17 can be formed from one substrate 14.

Thereafter, liquid crystal is injected between the two glass substrates of the liquid crystal panel 17 to complete the liquid crystal display panel.

[0026]

As described above, according to the present invention, processing can be performed on a large substrate until the second alignment is performed, and the second alignment is performed on a substrate having a smaller size than the large substrate. It is done in. As a result, there is no misalignment of the liquid crystal panel on which the fine electrode patterns are formed, and there is no mutual misalignment of the electrode patterns.

Further, since the sealing material is cured in a state of a substrate smaller in size than a large substrate, the gap dimension between the two glass substrates of the liquid crystal panel becomes uniform. As a result, a large number of liquid crystal panels can be manufactured in a short time.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a method for manufacturing a liquid crystal display panel of the present invention.

FIG. 2 is a perspective view illustrating a method of manufacturing a conventional liquid crystal display panel.

[Explanation of symbols]

 11 First Large Substrate 12 Second Large Substrate 13 Alignment Mark 14 Substrate 15 Hot Press 17 Liquid Crystal Panel

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G02F 1/13 101 G02F 1/1333 G02F 1/1339 G09F 9/00

Claims (1)

(57) [Claims] After a predetermined coating is formed on each surface, an electrode pattern and an alignment mark are formed, and a sealing material is formed on a pair of large substrates on which a plurality of liquid crystal panels are formed. A step of superimposing and overlaying a large substrate, a step of cutting the large substrate and dividing the substrate into a plurality of substrates on which the liquid crystal panel is formed, and heating the substrate to soften the sealing material. 2. A method for manufacturing a liquid crystal display panel, comprising the steps of: