JPH1138436A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to easily check whether cross materials are formed to a normal size in normal forming positions by providing the parts where the cross materials of one substrate of both substrates are disposed with marks for checking the cross materials forming positions. SOLUTION: The four corner parts of a black mask 12 are chamfered. The central parts of the respective chamfered parts 31 are provided with V-shaped notches (marks for checking the cross materials forming positions) 32. In such a case, the opening angle on the two sides of the respective notches 32 is nearly perpendicular. The normal forming positions of the cross materials 23 having nearly a columnar shape in this case are the positions where the outer peripheral surfaces of the cross materials 23 come in contact with both of the two sides of the notches 32 of the black mask 12. The cross materials 23 formed on the rear surface of a common electrode 15 and the notches 32 of the black mask 12 of this device are distinctly and simultaneously observable from the lower side. If the parts of the notches 32 of the black mask 12 or the parts near the same are searched, whether the cross materials 23 are formed or not is easily checked.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a liquid crystal display device, and more particularly to a mark for applying a cloth material for conducting between upper and lower substrate electrodes.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view showing a part of an example of a conventional liquid crystal display device. This liquid crystal display device includes a lower substrate 1 and an upper substrate 11 made of glass or the like. In the display area on the upper surface of the lower substrate 1, pixel electrodes 2 made of ITO and thin film transistors 3 as switching elements are provided in a matrix. Further, at the four corners of the non-display area on the upper surface of the lower substrate 1, there are provided upper substrate 11, and cross connection pads 4 for installing a cross material for electrically connecting each electrode formed on the lower substrate 1. I have.
Further, in the non-display area on the upper surface of the lower substrate 1, the vicinity of at least one of the four cross connection pads 4 is connected to the cross connection pad 4 via a leading line 5. A connection terminal 6 is provided. An overcoat film 7 is provided on the entire upper surface except for the cross connection pads 4 and the connection terminals 6. In this state, the portion of the cross connection pad 4 is exposed through the contact hole 8 formed in the overcoat film 7, and the portion of the connection terminal 6 is
It is exposed through the opening 9 formed in the opening. In the display area, an alignment film 10 is provided on the upper surface of the overcoat film 7.

A black mask 12 made of chrome or the like is provided in a lattice pattern in a display area on the lower surface of the upper substrate 11, and a dummy black mask 12a is provided in a non-display area on the lower surface. In addition, red, green,
Each blue color filter element 13 is provided, and a dummy color filter 13a is provided in a non-display area on the lower surface. Further, an overcoat film 14 is formed on the entire lower surface.
The common electrode 15 made of ITO is provided on the entire lower surface thereof, and the alignment film 16 is provided on the display region on the lower surface thereof. Then, the lower substrate 1 and the upper substrate 11
Is a sealing material 21 provided in advance in a non-display area on a predetermined surface of one of the substrates 1 and 11 so as to surround the display area.
Are attached to each other. Further, the alignment films 10 and 16 of the two substrates 1 and 11 inside the sealing material 21 are formed.
A liquid crystal 22 is sealed between them. Further, the cross connection pad (electrode) 4 and the common electrode 15 facing the cross connection pad (electrode) 4 are conductively connected via a substantially columnar cross material 23 made of silver paste or the like disposed in the contact hole 8. .

[0004]

When the cloth members 23 are formed in the manufacturing process of such a liquid crystal display device, for example, the cloth members 23 are applied to the lower surface of the common electrode 15 one by one using a needle-like nozzle (not shown). It is formed by doing. In this case, the cloth material 23 is adhered to the lower surface of the common electrode 15 by its own adhesive force. However, the cloth material 23 may be removed when the attachment is poor, so that the cloth material 23 is formed on the lower surface of the common electrode 15. Is checked visually. However, since the cloth material 23 has an extremely small outer diameter and has no mark at its forming position, it is extremely difficult to confirm whether or not the cloth material 23 is formed, and it takes time to confirm. was there. Further, there is also a problem that it is not possible to confirm whether or not the cloth material 23 is formed at a regular size at a regular size. An object of the present invention is to make it possible to easily confirm whether or not a cloth material is formed at a regular formation position with a regular size.

[0005]

According to the present invention, two substrates having electrodes provided on opposing surfaces are bonded to each other via a sealing material, and a liquid crystal is provided between the two substrates inside the sealing material. In a liquid crystal display device in which a cross material is provided between the two electrodes, a cross material formation position confirmation mark is provided on a portion of one of the two substrates where the cross material is provided. is there.

According to the present invention, since the cross material formation position confirmation mark is provided at a portion of one of the two substrates where the cross material is provided, the cross material formation position confirmation mark is provided. As a guide, the cloth material itself and its formation position can be easily confirmed, and therefore, it can be easily confirmed whether or not the cloth material is formed at a regular formation position with a regular size.

[0007]

FIG. 1 is a view of an upper substrate before bonding of a liquid crystal display device according to a first embodiment of the present invention, as viewed from a lower surface which is a surface facing a lower substrate. In this figure, parts having the same names as those in FIG. 5 are denoted by the same reference numerals, and description thereof will be omitted as appropriate. On the lower surface of the upper substrate 11, a black mask 12 made of chrome or the like is formed to be smaller than the upper substrate 11 in a region excluding the peripheral and central pixels. It should be noted that only the outline of the black mask 12 is indicated by a broken line, and the lattice-shaped portion formed in each central pixel region is not shown. Four corners of the black mask 12 are chamfered. At the center of each chamfered portion 31, a V-shaped cut (cross material forming position confirmation mark) 32 is provided. in this case,
The opening angle of the two sides of each cut 32 is substantially a right angle.
In this case, the regular formation position of the substantially cylindrical cross member 23 is a position where the outer peripheral surface of the cross member 23 contacts both sides of the cut 32 of the black mask 12.

When the cloth material 23 is formed in the manufacturing process of the liquid crystal display device, a needle-like nozzle (see FIG. 1) is provided on the lower surface of the common electrode 15 (however, in FIG. (Not shown). Next, a case where the formed cross member 23 is confirmed will be described. First, generally, the common electrode 15 made of ITO is transparent, and the black mask 12 made of chromium or the like and the cloth material 23 made of silver paste or the like are opaque. Although not shown in FIG. 1,
Referring to FIG. 5, the overcoat film 14 made of silicon nitride or the like interposed between the black mask 12 and the common electrode 15 is also transparent. Therefore, the cross material 23 formed on the lower surface of the common electrode 15 and the cut 32 of the black mask 12 can be clearly and simultaneously observed from below. Then, by searching for the cut 32 of the black mask 12 or the vicinity thereof, it can be easily confirmed whether or not the cloth material 23 is formed.
In addition, by checking the position where the outer peripheral surface of the cloth material 23 is in contact with the two sides of the cut 32, it is easy to check whether the cloth material 23 is formed in a proper size at a proper size. can do. Further, since the black mask 12 is also used as the cross material formation position confirmation mark, it is not necessary to newly provide a step of forming the cross material formation position confirmation mark, and an increase in the number of steps can be avoided.

Next, FIG. 2 shows a bottom view of a part of an upper substrate of a liquid crystal display device according to a second embodiment of the present invention. In this figure, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted as appropriate. In this liquid crystal display device, two rectangular openings (cross material forming position confirmation marks) 33a and 33b are provided in a chamfered shape inside the chamfered portion 31 of the black mask 12. In this case, the opening angles of the two openings 33a and 33b are substantially right angles. In this case, the regular formation position of the cloth material 23 is a position where the outer peripheral surface of the cloth material 23 contacts both predetermined short sides of the openings 33 a and 33 b of the black mask 12.

Therefore, in this case, the common electrode 15
Material 23 and black mask 12 formed on the lower surface of
And the opening portions 33a and 33b can be clearly and simultaneously visually observed from below. Then, if the intersection of each center line extending in the long side direction of the two openings 33a and 33b of the black mask 12 or its vicinity is searched, it can be easily confirmed whether or not the cross material 23 is formed. . Also, by confirming the position where the outer peripheral surface of the cloth material 23 is in contact with each of the predetermined short sides of the openings 33a and 33b, the cloth material 23 is formed in a regular size at a regular formation position. Can be easily checked.

Next, FIG. 3 is a bottom view of a part of an upper substrate of a liquid crystal display device according to a third embodiment of the present invention. In this figure, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted as appropriate. In this liquid crystal display device, an isosceles triangular mark (a mark for confirming the position of forming a cloth material) 3 made of the same material as the black mask 12 is provided outside the central portion of the chamfered portion 31 of the black mask 12.
4 are provided. And the cloth material 23 in this case
In the normal formation position, the outer peripheral surface of the cloth material 23 has the mark 3
4 and the center of the circular cross section of the cross member 23 is located on an extension of the center line of the mark 34 that divides the vertex angle of the mark 34 into two equal parts.

Therefore, in this case, the common electrode 15
The cross member 23 and the mark 34 formed on the lower surface of the can be clearly and simultaneously visually observed from below. Then, by searching for the intersection or the vicinity of the chamfered portion 31 with the extension of the center line of the mark 34 passing through the vertex of the mark 34 or the vicinity thereof, it can be easily confirmed whether or not the cross material 23 is formed. . Also, the outer peripheral surface of the cloth material 23 is marked 34.
By checking whether or not the center of the cloth material 23 is in contact with the vertex of the mark 34 and is located on an extension of the center line of the mark 34 passing through the vertex of the mark 34, so that the cloth material 23 is formed at the regular formation position. It can be easily confirmed whether or not it has been performed.

FIG. 4 is a bottom view of a part of an upper substrate of a liquid crystal display according to a fourth embodiment of the present invention. In this figure, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted as appropriate. In this liquid crystal display device, four strip-shaped projections (cross material formation position confirmation marks) 35a to 35 made of the same material as the black mask 12 are provided outside the chamfered portion 31 of the black mask 12.
d is provided. In this case, the inner two projections 35
The distance between a and 35b is the same as the minimum allowable diameter of the cloth material 23. The permissible minimum diameter of the cloth material 23 means that if the diameter of the cloth material 23 is too small,
Is too small to exhibit the function as the cloth material 23, and is the minimum diameter that does not occur. Two outer projections 35c, 35
The interval d is the same as the maximum allowable diameter of the cloth material 23. The maximum allowable diameter of the cloth material 23 is the cloth material 2
If the diameter of 3 is too large, the wiring pattern formed on the lower substrate (not shown) will be short-circuited. As described above, the role of the two inner protrusions 35a and 35b and the role of the two outer protrusions 35c and 35d are different, so that these protrusions 35a to 35d can be visually distinguished. The length of the two inner protrusions 35a and 35b is shorter than the length of the two outer protrusions 35c and 35d. The normal formation position of the cloth material 23 in this case is such that the center of the cloth material 23
a, 35b.

Therefore, in this case, the common electrode 15
Material 23 and black mask 12 formed on the lower surface of
And the four projections 35a to 35d can be clearly and simultaneously visually observed from below. Then, by searching for the portions of the four protrusions 35a to 35d of the black mask 12 or in the vicinity thereof, it can be easily confirmed whether or not the cross member 23 is formed. Also, by checking whether or not the center of the cloth material 23 is located between the two inner protrusions 35a and 35b, it is easy to check whether or not the cloth material 23 is formed at the regular formation position. be able to.
Furthermore, the diameter of the cloth member 23 and the two inner projections 35
a, 35b, the cloth material 2
It can be easily confirmed whether the diameter of No. 3 is larger than the allowable minimum diameter. Further, by comparing the diameter of the cloth member 23 with the interval between the two outer protrusions 35c and 35d, it can be easily confirmed whether or not the diameter of the cloth member 23 is smaller than the allowable maximum diameter.

In the fourth embodiment, the four strip-like projections 35a to 35a are used as cross material formation position confirmation marks.
The case where 35d is provided has been described. However, the present invention is not limited to this. For example, a step-like protrusion or recess may be provided symmetrically. In the first to fourth embodiments, the black mask 12 including the cross material formation position confirmation mark is provided on the upper substrate 11 side on which the common electrode 15 is provided.
Although the case where the cloth material 23 is applied to the upper substrate 11 side has been described, the invention is not limited to this, and a black mask including a cloth material formation position confirmation mark is provided on the lower substrate 1 side where switching elements such as the thin film transistors 3 are provided. Alternatively, a cloth material may be applied to the lower substrate 1 side. Further, the black mask may be formed of resin black.

[0016]

As described above, according to the present invention, the cross material forming position confirmation mark is provided at the portion of one of the two substrates where the cross material is provided. The cloth material itself and its forming position can be easily confirmed using the cloth material forming position confirmation mark as a guide, and therefore, it is easy to determine whether or not the cloth material is formed at a regular size at a regular size. You can check. If the black mask is also used as the cross material formation position confirmation mark, an increase in the number of steps for forming the cross material formation position confirmation mark can be avoided.

[Brief description of the drawings]

FIG. 1 is a bottom view of an upper substrate of a liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is a bottom view of a part of an upper substrate of a liquid crystal display device according to a second embodiment of the present invention.

FIG. 3 is a bottom view of a part of an upper substrate of a liquid crystal display device according to a third embodiment of the present invention.

FIG. 4 is a bottom view of a part of an upper substrate of a liquid crystal display device according to a fourth embodiment of the present invention.

FIG. 5 is a partial cross-sectional view of an example of a conventional liquid crystal display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Upper substrate 12 Black mask 15 Common electrode 23 Cloth material 32 Cut (mark for confirming cross material formation position)

Claims (2)

[Claims] 1. Two substrates each having electrodes provided on opposing surfaces are bonded together via a sealing material, and a liquid crystal is sealed between the two substrates inside the sealing material.
In a liquid crystal display device in which a cross material is provided between the two electrodes, a cross material formation position confirmation mark is provided on a portion of one of the two substrates where the cross material is provided. Liquid crystal display. 2. The cross material forming position confirmation mark is
2. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is formed by a black mask provided to block transmission of light.