JP2002043703A - Multiple mother board and liquid crystal display element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily recognize the position where a cell board has been located on a mother board even if the cell board is cut out of the mother board and assembled in a product. SOLUTION: Cutting marks 12 are fiducial marks when the cell boards 11a, 11b, 11c are cut out of the multiple mother board 1. The cutting marks 12 have identification elements which can identify locations of the call boards on the multiple mother board 1, e.g. alphabet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiple mother board and a liquid crystal display device, and more particularly, to a product management technique capable of easily tracking the source of a defective cell substrate. .

[0002]

2. Description of the Related Art In manufacturing a liquid crystal display device, two cell substrates (transparent electrode substrates) of a front panel called an F plate and a rear panel called an R plate are used as basic components. However, in the actual production process, a plurality of F and R cell substrates are simultaneously formed on the mother substrate.

Then, a step of printing a peripheral sealing material around each cell substrate of one of the mother substrates, a step of bonding the mother board on the F plate side and the mother board of the R plate, Alternatively, after a step of cutting out the stick substrate in a row unit to form an injection port and a step of injecting liquid crystal into each cell to seal the injection port, individual products are cut out from the stick substrate.

[0004]

By the way, in order to form a plurality of cell substrates on a mother substrate, a photomask is formed on the mother substrate on which a transparent conductive film made of, for example, ITO (indium tin oxide) is formed. Exposure (patterning) is performed through a mask. For example, if dust is adhered to the photomask, the ITO substrate is disconnected at the same location on each mother substrate, that is, the cell substrate at the same position, and the adjacent IT
A defect such as a short circuit between the O electrodes occurs.

If the disconnection defect is found on the cell substrate cut out from the mother substrate, there is a possibility that a product (including a work-in-progress) in which the cell substrate at the same position is used also has a disconnection defect. is there. However, conventionally, since an address (position) on the mother substrate is not particularly displayed on each cell substrate, a great deal of labor has been required to search for a product regarded as a defective product.

[0006]

According to the present invention, even if a cell substrate is cut from a mother substrate and incorporated into a product, it is easy to know which position of the mother substrate the cell substrate belongs to. it can.

[0007] Therefore, the present invention includes a plurality of cell substrate forming regions on which transparent electrodes are formed, and a cutting mark serving as a reference for cutting each cell substrate at four corners in each cell substrate forming region is provided with the transparent electrode. The multi-cut mother board formed together with the multi-cut mother board is characterized in that the cutting mark has an identification element for identifying a position of each of the cell substrates on the multi-cut mother board.

In the present invention, the identification element is preferably a symbol such as a numeral or an alphabetic character formed in the cutting mark. According to this, it is not necessary to change the outer shape of the cutting mark itself. Further, in order to make the position of each cell substrate on the mother substrate easy to understand, it is preferable to assign the row position and the column position of each cell substrate to the identification element.

Since the cutting mark is formed in the cell substrate, the source of the cell substrate can be known even after the liquid crystal display device is assembled. Therefore,
A liquid crystal display device provided with the cell substrate cut out from the multiple mother board is also included in the scope of the present invention.

In this specification, a cell substrate forming region is a region where a cell substrate is formed on a mother substrate, and the cell substrate is formed in the cell substrate forming region and then cut out from the mother substrate. .

[0011]

Next, an embodiment of the present invention will be described with reference to the drawings. In the first embodiment shown in FIG. 1, the multiple mother board 1 has a plurality of cell substrate formation regions 11 included therein arranged in three columns, but the number of rows is not limited to the first row to the first row for convenience of drawing. Up to four lines are shown.

The mother substrate 1 is a glass substrate having a transparent conductive film made of ITO formed on one entire surface thereof. The transparent electrode pattern on the side is exposed and then developed. Simultaneously with the patterning of the transparent electrode, cutting marks 12 made of ITO are formed at each of the four corners of each cell substrate formation region 11. Note that the cutting marks 12 are formed not only in the cell substrate forming region 11 but also in the discarded substrate portion 1 a existing on the outer peripheral portion of the mother substrate 1.

The cutting mark 12 is formed in each cell substrate forming region 1
This mark serves as a reference when cutting the cell substrate formed in No. 1 and is usually a square. Since the cutting marks 12 are arranged at the four corners of each cell substrate forming region 11, four cutting marks 12 are gathered at the corners of four adjacent cell substrate forming regions 11. Is cut in the column direction and the row direction so as to pass between the cutting marks 12, whereby the cell substrate is cut out from the mother substrate 1.

Therefore, the cutting mark 12 is carried to the downstream process together with the cut cell substrate. According to the present invention, the motherboard 1
An identification element for identifying the position of the cell substrate above is attached. This identification element is also formed simultaneously with the cutting mark 12 by exposure through a photomask.

In the first embodiment, four cutting marks 1 gathered at the corners of four adjacent cell substrate forming regions 11
2 is one group, and alphabetical letters are given to each group in order from the top in the row direction. Speaking of the three columns and four rows shown in FIG. 1, A to J are assigned to each group.

FIG. 2 is an enlarged view of the cell substrate 11a cut out from the first column and the first row of the mother substrate 1.
The source address (address) of the cell substrate 11a from the mother substrate 1 is A, B, F, and E if the four cutting marks 12 are read, for example, clockwise.

Similarly, the second row, the first
The source address of the cell substrate 11b cut out from the row is B,
The source addresses of the cell substrate 11c cut out from the third column and the first row are C, D, H, and G, and the same source address does not exist on the same mother substrate 1.

Accordingly, when the mother substrate 1 is exposed in units of one lot using the same photomask, for example, when a disconnection failure is found in a cell substrate cut out from the mother substrate 1 in the lot, the cell substrate is exposed. Find the same source.

When the number of chamfers on the mother substrate 1 is increased, it may be difficult to cope with only alphabets as in the first embodiment. In addition, even if arithmetic numerals or the like are used, the cutting mark 12 itself is, for example, 1 × 1 mm.
Because it is as small as an angle, we want to avoid three digits or more if possible.

According to the second embodiment shown in FIG. 3, the identification element can be expanded with limited symbols. That is,
Also in the second embodiment, the four cutting marks 12 gathered at the corners of the four adjacent cell substrate forming regions 11 are treated as one group as in the first embodiment. In this case, the four cutting marks 12 Are given the meaning of row numbers, and the remaining two are given the meaning of column numbers.

More specifically, alphabets A, B, C,...
The two cutting marks 12 are assigned 1, 2, 3,... As column numbers. FIG. 4 shows the first row and the first row of the mother substrate 1 shown in FIG.
The cell substrate 11a cut out from the row is shown in an enlarged manner. According to this, the source address of the cell substrate 11a is 1 if four cutting marks 12 are read clockwise, for example.
2, B, B.

Similarly, the source addresses of the cell substrate 11b cut out from the second column and the first row of the mother substrate 1 in FIG. 3 are 2, 3, B and B, and from the third column and the first row. The source addresses of the cut-out cell substrate 11c are 3, 4, B, and B, and the same source address does not exist on the same mother substrate 1 also in the second embodiment.

The present invention is not limited to the above embodiments. In particular, the symbol attached to the cutting mark 12 can be arbitrarily selected. In each of the above embodiments, the identification elements are attached to all the four cutting marks 12 gathered at the corners of the adjacent four cell substrate formation regions 11. An identification element may be added to at least one of the two cutting marks 12. In some cases, a lot number can be added as an identification element. In addition, the present invention is naturally applicable to the motherboard on the R plate side.

[0024]

As described above, according to the present invention,
The cutting mark, which is used as a reference when cutting each cell substrate from the multi-plane mother board, has an identification element that allows the position of the cell substrate on the multi-plane mother board to be identified. Even if the cell substrate is cut out and incorporated into a product, it can be easily known to which position on the mother substrate the cell substrate belongs.

Therefore, for example, when a defect such as disconnection is found in a cell substrate cut out from a mother substrate in the same production lot having the same photomask, it has the same identification element (source address) as the cell substrate. What is necessary is just to search for, and it is possible to quickly cope with the appearance of a defect.

[Brief description of the drawings]

FIG. 1 is a plan view schematically showing a part of a multiple mother board according to a first embodiment of the present invention.

FIG. 2 is a plan view schematically showing one cell substrate cut out from the multiple mother board of the first embodiment.

FIG. 3 is a plan view schematically showing a part of a multiple mother board according to a second embodiment of the present invention;

FIG. 4 is a plan view schematically showing one cell substrate cut out from the multiple mother board according to the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Multi-faced mother board 11 Cell board formation area 11a, 11b, 11c Cell board 12 Cutting mark C Cutting line

Claims (4)

[Claims] A plurality of cell substrate forming regions on which transparent electrodes are formed, and cut marks serving as references for cutting each cell substrate at four corners in each of the cell substrate forming regions are formed together with the transparent electrodes. A multiple mother board, wherein the cutting mark has an identification element for identifying a position of each of the cell substrates on the multiple mother board. 2. The method according to claim 1, wherein the identification element comprises a symbol such as a numeral or a letter formed in the cutting mark.
A mother board according to any one of the above items. 3. The multiple mother board according to claim 1, wherein a row position and a column position of each of the cell substrates are assigned to the identification element. 4. A liquid crystal display device comprising the cell substrate cut out from the multiple mother board.