JPH07270738A - Production of liquid crystal display device - Google Patents

Abstract

PURPOSE:To decrease glass plates of unnecessary part generated by cutting and separating large-sized glass substrate to half and to improve the working efficiency by integrating the upper glass plate and lower plate of the unnecessary part at the time of producing plural cells for display in a multi-plate production from the large-sized substrate. CONSTITUTION:Two sheets of the glass substrates 11, 12 are integrally coupled by applying joining material 17 to the unnecessary parts, i.e., selvage parts of the substrates. Next, the upper and lower glass substrates 11, 12 constituting the cells for display are separated from the upper glass plate 14 and lower glass plate 15 to be selvage part exclusive of these upper glass plate 14 and lower glass plate 15, when the glass substrates are cut along respective scribing flaws by using a scribing method. Cut glass pieces splash in an ordinary case when the glass is cut by the scribing method, however, the glass plates 14, 15 in the selvage part are integrated with the joining material 17 and, therefore, these glass plates do not part to be pieces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display manufacturing method for manufacturing a liquid crystal display from a glass substrate by multi-faceting.

[0002]

2. Description of the Related Art In manufacturing a small liquid crystal display,
For example, as described in Japanese Examined Patent Publication No. 58-8488, the display cell of a liquid crystal display is manufactured by cutting out from a large-sized substrate by multiple cutting. That is, an electrode pattern for a plurality of display cells of a liquid crystal display is formed on two large glass substrates facing each other, and a bonding material is provided around each electrode pattern. After the glass substrates of (1) are bonded together with a space therebetween, the two glass substrates are cut and separated for each display cell.
It should be noted that the liquid crystal member is injected between the two electrodes whose periphery is sealed by the bonding material. This injection is performed either before or after the separation and cutting for each display cell. To do.

For the above-described cutting for multiple cutting, a method of making a linear flaw on a glass substrate with diamond or the like and then giving an impact to the glass substrate is widely used because it is simple and inexpensive. .

A plurality of display cells can be produced from a large glass substrate by using the manufacturing method by such multiple cutting, but when the large glass substrate is separated and cut into a plurality of display cells. In addition, unnecessary portions other than the portions to be the display cells of the glass substrate, so-called ear portions, are simultaneously cut and separated. The number of ears becomes smaller and increases as the number of display cells that can be manufactured from a large glass substrate increases.
The smaller the ears, the more difficult it is to handle and the more difficult it is to remove them from each display cell. Also,
A large amount of glass powder is generated by the contact between the separated ears and the contact between the separated ears and the display cell. As described above, if the number of ears is increased, the amount of glass powder is increased, which causes a flaw on the surface of the display cell.

As described above, in manufacturing a display cell, two large glass substrates integrated with a bonding material are separated and cut, but since the bonding material is not attached to the ears, they are separated. When cut, per ear,
Two upper and lower ears glass plates are produced, the number of ears glass plates produced per display cell is large, a large amount of glass powder is generated, and a flaw on the surface of the display cell is likely to occur.

For this reason, in order to reduce the number of glass plates in unnecessary portions, for example, as described in Japanese Patent Laid-Open No. 57-49556, the unnecessary portions of the two glass substrates are also connected to the display cell portion. Similarly, there is known a structure in which a bonding material is provided and two glass substrates are bonded to each other in a so-called ear portion.

[0007]

SUMMARY OF THE INVENTION
As described in JP-A-57-49556, when the bonding material is similarly formed on the ears, the portion surrounded by the bonding material is in a completely sealed state and surrounded by the bonding material when the two substrates are joined together. The broken portion has a problem that there is a possibility that air cannot escape and the two substrates cannot be reliably joined.

An object of the present invention is to reduce the number of unnecessary portions of the glass plate, which are generated when the display cells are multi-faced, to be approximately half of the conventional one, thereby facilitating the handling and reducing the generation amount of the glass powder. Another object of the present invention is to provide a method of manufacturing a liquid crystal display device which can reduce the occurrence of flaws on the surface of a display cell and can reliably bond two glass substrates.

[0009]

According to the present invention, there is provided a forming step of forming electrode patterns for a plurality of display cells on portions of two glass substrates facing each other, and one forming cell for each of the display cells. And a bonding step of bonding the two glass substrates by the bonding material at positions surrounding the respective electrode patterns, and the two bonded glass substrates for each display cell. In the method for manufacturing a liquid crystal display device including a separation step of separating into, before the separation step,
A point-like joining process is also used to join the glass substrates of unnecessary portions other than the display cell portion of the two glass substrates with a plurality of dots using a joining material.

In another embodiment, the point-like joining step is
It is characterized in that the shapes of the glass substrates of unnecessary portions other than the display cell portion of the two glass substrates bonded in a dot shape are different.

In still another embodiment, in the spot-shaped joining step, all the glass substrates of unnecessary portions other than the display cell portion of the two glass substrates separated in the separating step are joined in a spot-like shape. It is a feature.

[0012]

According to the present invention, since the upper and lower two glass plates of the unnecessary portion to be separated and removed are integrated by the bonding material, the glass plate of this portion can be regarded as a single glass plate after the separation. Compared with the case where the unnecessary portion of the glass plate is separated into two pieces after separation, the number of glass sheets in this unnecessary portion is almost halved, the generation amount of glass powder is reduced, and the surface flaw of the display cell is reduced. Occurrence is also reduced. Further, since the bonding material of the unnecessary portion is provided in a plurality of spots, when the glass substrates are bonded together, the gap between the glass substrates is not completely sealed and an air escape path can be secured. The glass substrates can be joined reliably.

[0013]

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

In FIG. 1, 11 and 12 are large glass substrates, and four display cells 13, for example, are manufactured from these glass substrates 11 and 12 by multi-chambering.

Each of the display cells 13 has an upper glass plate 14 obtained from the upper glass substrate 11 and a lower glass plate 15 obtained from the lower glass substrate 12. Further, the two glass substrates 11 and 12 are opposed to each other, and 1
An electrode pattern for one display cell 13 is formed in each of the display cells 13, that is, the upper and lower glass plates 14 and 15 in the forming process.

Further, the two glass substrates 11 and 12 are bonded to a position surrounding the periphery of one electrode pattern of the display cell 13, that is, around the overlapping portion of the upper glass plate 14 and the lower glass plate 15. A material is provided, and the two glass substrates 11 and 12 are bonded to each other by a bonding process while maintaining a distance between them.

Further, the upper glass plate 14 and the lower glass plate 15 are overlapped with each other, and the liquid crystal member is injected into the facing space sealed by the bonding material.

Further, a dot-shaped (including island-shaped) bonding step is also performed between unnecessary portions of the two glass substrates 11 and 12 other than the portions to be the display cells 13, that is, between the glass substrates 11 and 12 of the so-called ear portion. Then, the bonding material 17 is applied in a dot shape for preventing the loosening, and the bonding material 17 also integrally joins the upper and lower glass substrates 11 and 12 to be the ears. In addition, this bonding material 17
Is not necessarily the same as the bonding material for bonding the upper and lower glass plates 14 and 15 of the display cell 13 part, but it is better to use the same bonding material for the display cell 13 This is preferable because it can be applied at the same time in the application process and no additional process is required. Further, the shape of the joining portion formed by the joining material 17 for preventing the loosening does not have to be as shown in the figure, but the upper and lower glass plates 14 and 15 which are separated and removed as the ears.
A minimum area for bonding the display cell 13 until the manufacturing process of the display cell 13 is completed is necessary.

Next, a separation step of manufacturing the plurality of display cells 13 by cutting the two glass substrates 11 and 12 thus bonded together will be described.

As the glass cutting method, a commonly used scribing method is used because straight line cutting is easy.

First, as shown in FIG. 2, three separation lines, for example, the first cutting plane A for cutting the two glass substrates 11 and 2 in the horizontal direction are set. The set position of the first cut surface A is a portion which is the short side of the upper glass plate 14. next,
Four scribe flaws for the second cut surface B are provided on the lower surface of the lower glass substrate 12. The set positions of these second cut surfaces B are the long sides of the lower glass plate 15.

When the two glass substrates 11 and 2 are cut along the separating line, for example, the first cutting plane A, the upper and lower unnecessary portions are first separated and removed as shown in FIG. Further, the portion between them is also divided at the position which is the short side of the upper glass plate 14.

Next, as shown in FIG. 4, separation lines in the vertical direction shown in the drawing, for example, four scribe flaws for the third cutting plane C are provided to the divided parts as described above, and the separation lines are formed. For example, three scribe flaws for the fourth cut surface D are provided. The third cut surface C is set at a position that is the long side of the upper glass plate 14. Further, the separation line, for example, the fourth cut surface D is set at a position which is the short side of the lower glass plate 15.

Then, when the upper and lower glass substrates 11 and 12 are cut along each of these scribe flaws, as shown in FIG. 5, an upper glass plate 14 and a lower glass plate 15 which constitute a display cell 13, It is separated into ears other than the upper glass plate 14 and the lower glass plate 15.

Here, if the glass is cut by the scribing method, the cut glass pieces are usually scattered, but as shown in FIG. 5, the cut and separated glass plates at the upper and lower portions of the ears are separated. Since 14 and 15 are integrated by the joining material 17, they are not scattered and scattered as in the conventional case. Further, since the separated ears are almost vertically integrated, it is possible to reduce the number of the separated glass plates by about half as compared with the conventional case where the upper and lower glass plates are separately separated. Therefore, it is possible to reduce the amount of glass powder generated by the mutual contact between the separated glass plates, and to reduce the surface flaws of the display cell 13.

[0026]

According to the method of manufacturing a liquid crystal display of the present invention, when manufacturing a plurality of display cells from a large glass substrate by multi-chambering, the glass plates of unnecessary portions are vertically integrated, The number of unnecessary parts of glass caused by cutting and separating the glass substrate can be halved, improving work efficiency, reducing the amount of glass powder generated by contact between unnecessary parts, and reducing the surface flaws of the display cell. be able to. Further, since the bonding material of the unnecessary portion is provided in a plurality of spots, when the glass substrates are bonded together, the gap between the glass substrates does not become a completely sealed state, and an air escape path can be secured. The glass substrates can be joined reliably.

[Brief description of drawings]

FIG. 1 is a perspective view showing a relationship between a glass substrate cut and separated by an embodiment of a method for manufacturing a liquid crystal display according to the present invention and a contact material of an unnecessary portion.

FIG. 2 is a perspective view showing a process of manufacturing a display cell by cutting and separating the glass substrate shown in FIG.

FIG. 3 is a perspective view showing a process of manufacturing a display cell by cutting and separating the glass substrate shown in FIG.

FIG. 4 is a perspective view showing a process of manufacturing a display cell by cutting and separating the glass substrate shown in FIG.

FIG. 5 is a perspective view showing a process of manufacturing a display cell by cutting and separating the glass substrate shown in FIG.

[Explanation of symbols]

 11, 12… Glass substrate 13… Display cell 17… Bonding material

Claims (3)

[Claims] 1. A forming step of forming an electrode pattern for a plurality of display cells on portions of two glass substrates facing each other, and a position surrounding each of the electrode patterns for one display cell. And a separating step of separating the two glass substrates, which are bonded to each other, into a display cell. In the method of manufacturing a liquid crystal display device, before the separation step, a plurality of dots are used to join unnecessary glass substrates other than the display cell portion of the two glass substrates with a bonding material. A method for manufacturing a liquid crystal display, which comprises a step of forming a liquid crystal display. 2. The method of manufacturing a liquid crystal display device according to claim 1, wherein the dot-shaped bonding step is an unnecessary portion of the glass substrate other than the display cell portion of the two glass substrates bonded in a dot shape. A method of manufacturing a liquid crystal display, wherein the shapes of the different shapes are different. 3. The method for manufacturing a liquid crystal display device according to claim 1, wherein the dot-shaped joining step includes removing unnecessary portions other than the display cell portion of the two glass substrates separated in the separating step. A method for manufacturing a liquid crystal display, wherein all the glass substrates are bonded in a dot shape.