JP2001154175A - Liquid crystal display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the positioning accuracy for the center of a liquid crystal display panel when a through hole is to be formed in the panel having a through hole in the display part so that the panel can be also used together with an analog indicator. SOLUTION: A mark showing the center position of the part 6a where a through hole is to be formed is formed as the intersection point O of a plurality of linear slit 11a, 11b on the inner face of one of transparent electrode substrates.

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 panel, and more particularly, to a liquid crystal display panel having a through-hole in a display area for inserting, for example, a rotary shaft for a pointer for analog display. .

[0002]

2. Description of the Related Art A liquid crystal display panel is a so-called digital display because the position of each pixel is fixed and information is displayed by turning on and off each pixel. It has been used together with indicating instruments.

FIG. 3 shows an example of this. Referring to FIG. 3, a liquid crystal display panel 1 for use in combination with analog display basically includes two electrode substrates, a first transparent electrode substrate 2 and a second transparent electrode substrate 3, which are surrounded by a peripheral sealing material 4. At this time, for example, a disc-shaped hole seal 5 is provided at a predetermined portion in the cell gap.

A through-hole 6 is coaxially opened in both transparent electrode substrates 2 and 3 by a drill (not shown) so as to pass through the center of the hole seal 5 after the thermocompression bonding. The shaft 7 is inserted. A predetermined liquid crystal substance is injected into the cell gap between the transparent electrode substrates 2 and 3.

When a through-hole 6 is formed in the liquid crystal display panel 1, the relative position between the analog display and the digital display is prevented from being shifted, and the seal width of the hole seal 5 is made uniform to prevent sealing failure. Therefore, it is necessary to align the tip of the drill with the center position of the through hole 6. Therefore, conventionally, the positioning is performed by using a dedicated drilling jig 8 as shown in FIG.

That is, the hole forming jig 8 is provided with a partition 8a oriented in the X direction and a partition 8b oriented in the Y direction. Is pressed against the partition plates 8a and 8b to bring out the center position of the through hole 6.

[0007]

However, according to this positioning method, the accuracy depends on the outer shape tolerance of the liquid crystal display panel 1 and the assembly tolerance of the perforation jig 8, so that the accuracy of the through hole 6 can be reduced. It was difficult to locate the center.

Incidentally, the outer shape tolerance of the liquid crystal display panel 1 and the assembly tolerance of the perforating jig 8 are both about ± 0.5 m.
m, and therefore the through-hole 6
Was limited to about ± 1.0 mm.

[0009]

According to the present invention, the accuracy of centering of a through hole can be greatly improved, and even if the diameter of the through hole is small, the drill can be drilled without damaging the hole seal. Can be accurately drilled.

That is, the constitutional feature of the present invention is that a pair of transparent electrode substrates, each having a display forming element such as a transparent electrode and a light-shielding film formed in a predetermined pattern on opposing inner surfaces, are provided with a peripheral sealing material interposed therebetween. A liquid crystal in which a predetermined position in the display area is a through hole perforated portion and a sealing material for sealing the through hole is provided coaxially with the through hole perforated portion. In the display panel, a mark indicating the center position of the through hole perforated portion is formed as an intersection of a plurality of linear slits on the inner surface side of one of the transparent electrode substrates.

According to the current liquid crystal display panel manufacturing technology,
The transparent electrode can be formed at a fine pitch of the order of μm by a photolithographic method, and a light-shielding film can be accurately formed by a photolithographic method. Therefore, by forming a mark indicating the center position of the through hole perforated portion together with the transparent electrode or the light shielding film (black mask), it is possible to form the mark with a positional accuracy of, for example, ± 1.0 μm.

The above-mentioned center position mark is, for example,
When observing with a CD camera, it is preferable that the plurality of slits be formed as a white pattern in a solid painting pattern made of the same material as one of the display forming elements, in order to accurately capture an image. It should be noted that the white pattern is a portion having no solid coating material.

In view of the pattern design, the center position mark is preferably formed as an intersection of the two orthogonal slits. However, the plurality of slits are formed radially around the center position mark. Is also good.

[0014]

Next, embodiments of the present invention will be described. In the present invention, since the basic configuration of the liquid crystal display panel may be the same as that of the liquid crystal display panel 1 of FIG. 3 described above, the description thereof is omitted, and here, the liquid crystal display panel is formed exclusively in the through hole perforated portion. The center position mark (alignment pattern) to be performed will be described.

The circular frame shown in FIG. 1 is a portion where the through hole 6 is formed by a drill, that is, a through hole forming portion 6a. It should be understood that the hole seal 5 described with reference to FIG. 3 is formed in a concentric disk shape up to and around the through hole perforated portion 6a.

According to this embodiment, a square-shaped solid pattern 10 is arranged at the center of the through-hole perforated portion 6a, and two linear slits 11a and 11b are formed in the solid pattern 10. Are formed as a white pattern.

The slits 11a and 11b are orthogonal to each other so as to divide the solid coating pattern 10 into four equal parts, and the intersection point O is used as a center position mark when drilling the through-hole perforated portion 6a. In this example, the slits 11a, 11
Although “b” is formed so as to pass through the center of each side of the solid pattern 10, it may be formed along a diagonal line.

As another embodiment, as shown in FIG. 2, three slits 12a to 12c are formed in the solid coating pattern 10 at intervals of 120 degrees, and an intersection O of these slits 12a to 12c is formed. May be used as the center position mark. That is, a plurality of (preferably 3 to 8) slits may be formed radially from the center position mark.

The solid pattern 10 is provided on the inner surface of one of the first transparent electrode substrate 2 and the second transparent electrode substrate 3 in the liquid crystal display panel 1 of FIG. Display forming elements such as a transparent electrode and a light-shielding film are sequentially formed on the transparent electrode substrate. In the present invention, the solid coating pattern 10 is preferably formed simultaneously with any one of the display forming elements.

For example, when the solid pattern 10 is formed simultaneously with the transparent electrode, the solid coating pattern 10
It is formed by O (indium tin oxide) patterning. When the solid pattern 10 is formed simultaneously with the light shielding film, the solid pattern 10 is formed of a light shielding material such as chromium by a photolithography method.

Each of the above slits is a white pattern, that is, a portion having no ITO or light-shielding material. In this embodiment, the diameter of the through-hole perforated portion 6a is 9.0 mm, one side of the solid coating pattern 10 is 3.0 mm, and the line width of each slit is 0.1 mm.

When the through hole 6 is drilled in the through hole forming portion 6a, the tip of the drill is aligned with the intersection O of each slit. For the alignment, for example, the solid pattern 10 may be imaged by a CCD camera, and the position of the intersection O of each slit may be obtained by image processing means to control the drill position, or the intersection of each slit may be controlled by a microscope or the like. The drill tip may be aligned with the intersection O by visually observing O.

In either method, the through-hole piercing portion 6a
Since the center position mark of is formed in the transparent electrode substrate as the intersection of each slit, positioning can be performed with high accuracy without being affected by the tolerance of the panel outer shape or the tolerance of the hole-making jig as in the past. Can be. In the case of the above embodiment, the displacement of the mark can be neglected, so that it is possible to realize the drilling with a drill accuracy of ± 0.2 μm.

The shape of the solid pattern 10 is not limited to the regular square of the above embodiment. That is, as long as a plurality of slits intersecting at one location are provided, the shape of the solid coating pattern 10 can be arbitrarily designed.

[0025]

As described above, according to the present invention,
In a liquid crystal display panel provided with a through hole for use with an analog indicating instrument, a mark indicating the center position of the through hole perforated portion is formed as an intersection of a plurality of linear slits on the inner surface side of one of the transparent electrode substrates. As a result, the centering accuracy of the through hole can be significantly improved, and the hole can be accurately drilled without damaging the hole seal.

[Brief description of the drawings]

FIG. 1 is a plan view showing a through hole perforated portion having a center position mark which is a main part of the present invention.

FIG. 2 is a plan view showing another example of a center position mark.

FIG. 3 is a cross-sectional view illustrating a configuration of a liquid crystal display panel having a through hole.

FIG. 4 is an explanatory diagram for explaining a conventional panel alignment method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 2, 3 Transparent electrode substrate 4 Peripheral sealing material 5 Hole seal 6 Through hole 6a Through hole perforated part 10 Solid pattern 11a, 11b, 12a-12c Slit

Claims (4)

[Claims] 1. A pair of transparent electrode substrates, each having a display forming element such as a transparent electrode and a light-shielding film formed in a predetermined pattern on opposing inner surfaces, are pressure-bonded via a peripheral sealing material, and the display area thereof is formed. In a liquid crystal display panel, a predetermined position in the inside is a through hole perforated portion, and a sealing material for sealing the through hole is provided coaxially with the through hole perforated portion. A liquid crystal display panel, wherein a mark indicating a center position of the through hole perforated portion is formed as an intersection of a plurality of linear slits on an inner surface side of the transparent electrode substrate. 2. The liquid crystal display panel according to claim 1, wherein the plurality of slits are formed as a white pattern in a solid coating pattern made of the same material as one of the display forming elements. 3. The liquid crystal display panel according to claim 1, wherein the mark indicating the center position is formed as an intersection of two orthogonal slits. 4. The liquid crystal display panel according to claim 1, wherein the plurality of slits are formed radially around a mark indicating the center position.