JPH0727330B2 - Liquid crystal display - Google Patents

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 device, and more particularly to a liquid crystal display device in which a plurality of liquid crystal plates are arranged in series to form a screen.

[0002]

2. Description of the Related Art A liquid crystal display device has already been proposed in which a liquid crystal display (LCD) having a large number of pixels each composed of a plurality of picture elements (R, G, B) is connected to form a screen.

The structure of such a liquid crystal plate will be briefly described. FIG. 3 and FIG. 4 show one already proposed liquid crystal plate 1. This liquid crystal plate 1 has a glass substrate 3 having a transparent common electrode 2 formed on one surface thereof and a glass substrate 5 having a large number of transparent electrodes 4 of three sets formed on one surface thereof.
Are arranged so that their respective electrode surfaces face each other, a liquid crystal 7 is hermetically sealed between them by a sealing material 6, and the red (corresponding to the plurality of electrodes 4 of the glass substrate 5 is provided on the other surface of the glass substrate 3). R), green (G), blue (B) color filter 8
And the light shielding mask 9 are formed by printing or the like, and the glass substrates 3 and 5 are formed.
A polarizing plate 10 is attached to the outside of the with the same polarization axis. A large-screen display can be constructed by arranging a large number of such liquid crystal plates 1 connected to each other.

By the way, in a display having such a structure, that is, a liquid crystal display device, as shown in FIG.
It is very difficult to bring the joints of the liquid crystal plates 1 into close contact with each other, and it is very difficult to make a gap between the liquid crystal plates 1 though it is slight. Then, in order to prevent the leakage of light from the gap, it was considered that a masking tape 11 was attached to the display surface side to close the gap. However, a light source, such as a fluorescent light
When the incident light from 12 to the liquid crystal plate 1 is a parallel light beam which is perpendicular to the surface of the liquid crystal plate 1, the masking tape 11 can prevent the light from leaking from the joint portion.
It turns out that it is not very effective for oblique rays as shown by 13.

That is, since the liquid crystal plate 1 has a certain thickness, the oblique light ray 13 incident from the joint portion of each liquid crystal plate 1 extends from the peripheral side surface of the liquid crystal plate 1 to the display surface side of the glass substrate 5.
Will leak through. Of course, such oblique light rays 13 are not limited to those shown in FIG. 4, but also include light that is once reflected by the peripheral side surface of the liquid crystal plate 1 and penetrates deep into the center side of the glass substrate 5.

[0006]

In the conventional liquid crystal display device, as described above, light entering from the joint portion of the liquid crystal plate and the vicinity thereof leaks out through the glass substrate, so that the visual appearance of the screen is deteriorated. There was a problem. Further, the masking tape must be accurately positioned and adhered, and the adhesion work is difficult, and the liquid crystal plate must be accurately positioned, which requires skill.

The present invention has been made in view of the above problems, and prevents the entry of light from the joint portion of the liquid crystal plate and its vicinity to improve the visual appearance of the screen. It is an object of the present invention to obtain a liquid crystal display device in which no masking tape is attached and the liquid crystal plate can be easily positioned.

[0008]

A liquid crystal display device according to the present invention is provided with a light-blocking material which is sandwiched by joint portions of a liquid crystal plate.

[0009]

In the liquid crystal display device according to the present invention, the invasion of light is completely prevented by the light blocking material sandwiched between the joint portions of the liquid crystal plate.

[0010]

【Example】

Example 1. Hereinafter, the liquid crystal display device of the present invention will be described in more detail with reference to the preferred embodiments shown in the accompanying drawings. FIG. 1 shows a liquid crystal display device according to an embodiment of the present invention. In FIG. 1 showing this embodiment, the same components or corresponding portions as those of the liquid crystal display device shown in FIGS. 3 and 4 are designated by the same reference numerals and the description thereof will be omitted.

In the embodiment of the invention shown in FIG. 1,
An elastic material 16 such as a light-blocking material such as silicon rubber is sandwiched between the joints of the liquid crystal plates 1. One liquid crystal plate 1 is shown in FIG.
You can clearly see how the 16 is provided.

According to such a liquid crystal display device, oblique light is prevented from entering the joint portion on the side surface of the light source as shown in FIG. Further, since the gap at the joint is closed, it is not necessary to attach the masking tape 11.
The masking tape has to be set accurately at the position where it is attached, and the width dimension of the masking tape 11 itself and its attaching work also require high precision. However, the embodiment of the present invention shown in FIG. According to the example, the elastic material 16
Need only intervene.

Moreover, the deformation of the elastic member 16 itself facilitates the positioning of the liquid crystal plates 1 relative to each other, which facilitates the assembly work.

In the above embodiment, it is actually very difficult to form the glass substrate 3 of the liquid crystal plate 1 and the light-shielding mask 9 or the polarizing plate 10 in such a size that they are completely aligned with each other. In this case, generally, the light-shielding mask 9 and the polarizing plate 10 are slightly smaller than the glass substrate 3. Therefore, light may intrude from the edge portion of the surface of the glass substrate 3 on the light source side, which is slightly present. Therefore, in order to prevent such invasion of light as well, it is desirable to apply the black paint 14 or the like to the entire peripheral edge of the liquid crystal plate 1 on the side of the display surface as shown in FIG.

[0015]

As described above, according to the present invention,
When a screen is constructed by arranging a plurality of liquid crystal plates in series, a light-blocking material sandwiched between the joints of the liquid crystal plates is provided to prevent the transmission of light entering through the joints. It is possible to improve the appearance of the liquid crystal display, and it is possible to easily position the liquid crystal plate without attaching a masking tape.

[Brief description of drawings]

FIG. 1 is a top view schematically showing a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 shows a liquid crystal display device according to an embodiment of the present invention.
It is a perspective view which shows two liquid crystal boards.

FIG. 3 is a front view showing a conventional liquid crystal plate.

4 is a cross-sectional view of the liquid crystal plate taken along the line II-II in FIG.

[Explanation of symbols]

 1 Liquid crystal plate 3 Glass substrate 5 Glass substrate 6 Sealing material 7 Liquid crystal 16 Light blocking material (elastic material)

 ─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-58-57172 (JP, A) JP-A-52-80796 (JP, A) JP-A-56-11435 (JP, A)

Claims (2)

[Claims] 1. In a liquid crystal display device in which a plurality of liquid crystal plates are arranged in series to form a screen, light sandwiched by the seam portions to prevent transmission of light entering through the joint seam portion of each liquid crystal plate. A liquid crystal display device characterized by being provided with a blocking material. 2. The liquid crystal display device according to claim 1, wherein the light blocking material is made of silicone rubber.