JPS60232529A - Liquid-crystal display device - Google Patents

Abstract

PURPOSE:To reduce the area of a front surface projection of the sealing part of a liquid-crystal panel until the discontinuity of display is not a problem in practical use by a flank sealing part which has a thin sealing plate adhered to flanks of a substrate as the sealing part which is at least part of a liquid-crystal panel. CONSTITUTION:Two sides of substrates 31 and 32 are adhered together by printing a sealing material 33 through a screen and a flank adhesive 37 is applied to the thin sealing film 36 at the remaining two sides and adhered to the flanks of substrates to form a cell. Liquid crystal 34 is injected into the cell by a vacuum injecting method and the injection port is sealed with an epoxy sealing material 35 to form the liquid-crystal panel 30. An adhesive which sets by ultraviolet- ray irradiation is used effectively as the flank sealing material 37 as well as a two-liquid room-temperature setting type adhesive. This flanks sealing reduce the width of the sealing part greatly to about 0.2mm. on the whole.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a liquid crystal display device, and more particularly relates to a novel construction of the sealing part of a liquid crystal nozzle and an arrangement of seven nozzles and a flannel. It is something.

[Technical background of the invention]

The conventional liquid crystal (4) panel has a structure in which two substrates are bonded together with a sealant between them.

FIG. 1 shows a sectional view of a conventional liquid crystal panel.

The substrates 11 and 12 and the sealing material 13 provided therebetween constitute an envelope, in which a liquid crystal 14 is sealed.

Normally, this sealing material 13 is made by applying a thermosetting or thermoplastic adhesive or low-melting frit glass onto the 1 or 120 surface of one substrate by a screen printing method or a discharging method, and then applying the adhesive to the other substrate. It is formed by overlapping 12 or 11 and curing or fusing them. Hereinafter, this type of conventional sealing will be referred to as surface sealing.

FIG. 2 is a plan view of the liquid crystal channel shown in FIG. 1, and reference numeral 15 indicates a sealing material for the liquid crystal injection port. As is clear from FIG. 2, the sealing material 13 is formed on the peripheral portion of the surface of the substrate 11 with a predetermined area. The width 13-& of the surface sealing material 13 has a very large effect on the reliability (especially moisture resistance, heat resistance, and stress resistance) of the liquid crystal panel. In particular, if the width 13-a is less than 1 inch, it will be difficult to obtain a uniform sealing material width during the liquid crystal/gunnel manufacturing process (particularly during the sealing material coating process using screen printing). It is very difficult to ensure high reliability because the sealing material width becomes locally narrow. Furthermore, it is almost impossible commercially to manufacture a liquid crystal panel with an on-plane sealing material width of 0.5 m or less.

[Problems with conventional technology]

For the reasons mentioned above, a normal LCD panel has a width of approximately 1.
It is manufactured with a sealing material width of the above width. Therefore, in order to obtain a wide display area, when multiple liquid crystal panels are arranged adjacently in the same plane or in almost the same plane, the effective display area where the actual display can appear is at least as wide as the width of the sealing material on the plane. They could only be arranged at wide intervals, disrupting the continuity of the display and making it impossible to obtain high display quality.

[Purpose of the invention]

The present invention has been made in view of the above circumstances.
By reducing the front projected area of the sealed portion of the flannel, the effective display area of a liquid crystal display device in which multiple sheets of liquid crystal and flannel are lined up can be contiguous at much smaller intervals than in the past, resulting in improved display performance. An object of the present invention is to provide a liquid crystal display device that can reduce discontinuity to an extent that does not pose a problem in practice.

[Summary of the invention]

The present invention provides a liquid crystal display device using a liquid crystal i4 panel in which a liquid crystal is held between at least two substrates and a peripheral portion thereof is sealed, as a sealed portion of at least a portion of the liquid crystal/mother panel. This is a liquid crystal display device characterized in that a side sealing portion is provided on the side surface of the substrate with a thin sealing plate adhered thereto.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 shows a plan view of the liquid crystal/mother panel 30 according to the present invention, and FIG. 4 shows a sectional view of the side sealing portion of the liquid crystal panel 3o of FIG. 3. The manufacturing process of this liquid crystal old flannel 30 will be explained below.

That is, substrates 31 and 32 with a thickness of 1.1 cm on which transparent electrodes, liquid crystal alignment control films, etc. are formed are placed facing each other with spacers of 10 μm in particle size interposed therebetween, and the two sides of the substrates si and ss are arranged in the conventional manner. Using one of the surface sealing methods, the sealing material (I-based adhesive) 33 is screen printed and bonded, and the remaining two sides are coated with the side adhesive material 37 on the sealing thin film 36, and the substrate is bonded. It was glued to the sides to form a cell. A liquid crystal 34 was injected into this cell by a vacuum injection method, and the injection port was sealed with an epoxy sealant 35 to form a 3° liquid crystal panel. Metal foils such as aluminum and various polymer films are very effective materials for the sealing thin film 36, and in some cases, glass plates are also effective. In particular, polyester films whose surfaces have been treated to improve adhesion, such as plasma treatment, can easily cover the unevenness of the side surfaces caused by substrate alignment through deformation, and also have high adhesion properties. It was very effective in increasing the reliability of the system. Furthermore, in the case of a polymer film, since a transparent film can be used, it also has the advantage that the sealing portion is not noticeable even when the liquid crystal display panel is viewed from an oblique direction.

Further, as the side sealing material 37, in addition to ordinary thermosetting adhesives, two-liquid room temperature curing adhesives, and the like, ultraviolet curing adhesives were effective. In particular, with ultraviolet curable adhesives, it is easy to shorten the curing time after bonding, so a phenomenon 37 in which the sealing material 37 infiltrates the gap between the substrates 31 and 32 near the sealing part due to capillary action. −Easy to reduce &)
Depending on the process, it was possible to suppress the penetration to about 0.1 fi.

For side sealing as described above, the width of the sealing part is set to 0.
It has become possible to make it extremely small, about two sides. Furthermore, since the bonding width of the side sealing portion can be secured by the thickness of the substrate, the reliability of the sealing portion can be made to have a tol value comparable to that of the conventional method. Another possible sealing method is to apply only the sealing material to the side surface of the substrate without using a thin sealing plate, but this method is significantly inferior to the side surface sealing method of the present invention in terms of reliability. Ta. This is true unless the sealing material itself is highly susceptible to direct contact with the atmosphere.
This is thought to be because it is inferior to the present invention, which uses a thin sealing plate.

FIG. 5 shows an example of the display section of the liquid crystal display device of the present invention.
Four dot matrix display liquid crystal channels 30, 30, 30°30 having the structure shown in Fig. 3 are arranged with their side seals facing each other.
, so, so, s.

It is possible to arrange the effective display areas very close to each other with an interval of about 0.5 to 0.6 sides, and it is possible to achieve high display quality without impairing the continuity of the display. An areal dot matrix display device could be obtained. In this way, a large area, which was previously impossible, can be easily realized by the multi-channel system of the present invention. In addition, it goes without saying that it has the same effect not only on dot matrix display liquid crystals and motherboards, but also on liquid crystal panels of various operating methods, and is not affected by the type of liquid crystal display or the presence or absence of color filters. .

Furthermore, in the liquid crystal armpit shown in FIGS. 3 and 4, it is very effective to provide a fixing adhesive section 38 for fixing the substrates 31 and 32 to each other in addition to the sealing section. The fixing adhesive portion 38 will be explained below. For example, the fixing adhesive part 38 is 1.1 mm larger than the spacer particle size between the substrates 31 and 32.
Disperse heat-fusible resin particles (nylon 12 powder, etc.) or thermosetting resin particles (epoxy resin B-stage particles, etc.) with a particle size of ~5 times larger to heat-cure the surface sealing part. Heat treatment was performed at the same time as the treatment. As a result, it was possible to form a large number of point-shaped fixing adhesive portions 38 that were hardly noticeable. This fixing adhesive part 38 compensates for the fact that the side sealing part has a lower ability to apply stress to the substrate 31.32 to maintain a constant gap between the substrates 31.32 than the surface sealing. It is very effective for Especially the substrate 31.
Substrate 31.32 when 32 has large waves or undulations
Effective in compensating for intervals. Furthermore, it is equally effective to print and form the fixing adhesive portion 38 in a portion that does not pose a problem in terms of appearance when stamping the surface-sealed portion. Furthermore, a spacer whose surface is coated with heat-fusible or thermosetting resin can also be used as the fixing adhesive member.

Further, in this embodiment, side sealing is performed on two sides of the liquid crystal channel, but the present invention is not limited to this.

As described above, the most important feature of the liquid crystal display device of the present invention is that it makes it possible to manufacture a liquid crystal P4 panel with a small projected area of the sealed portion. The liquid crystal/quad channel of the present invention utilizes the side surface of the substrate for sealing a part or all of the peripheral sealing section. In other words, instead of applying a sealing material to the flat surface of the substrate using a printing method and bonding it together, as in the past,
This is side sealing in which a thin plate for sealing is adhered to the side surface of the substrate using a side sealing material. This side sealing part has a thickness of a thin sealing plate and a side sealing material layer, but this can be easily made to a much smaller value than the width of the sealing material on the surface of a conventional LCD panel. Needless to say, it is. Therefore, by arranging two or more liquid crystal aluminum panels so that their side-sealed portions face each other, it is possible to make the width of the joints and the tab-sealed portions of the panels extremely small. Furthermore, it becomes possible to create a multi-panel display device with high display quality that maintains display continuity, such as a large-area wall-mounted liquid crystal television. In addition, even when liquid crystal panels displaying dot matrix are arranged in succession, even when characters are displayed across two panels, the character shapes are hardly distorted, and natural characters can be displayed.

In addition, when performing the side sealing described in the present invention on most of the periphery of the liquid crystal panel, it may be difficult to maintain a constant distance between the substrates or the seal by simply using spacers as in the past. This may occur depending on the shape and type of the worn thin plate. A possible reason for this is that it is impossible to apply sufficient stress to the substrate to alleviate the warping of the substrate by using only the side sealing portions. In order to solve this problem, it has been found that it is effective to provide a fixing adhesive part for fixing the substrate in a part other than the sealing part.

Further, it is effective to provide the above-mentioned fixing adhesive portion to temporarily fix the substrates to each other before performing side sealing.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to form a seal that forms a sealed portion with a very narrow width, which could not be obtained conventionally. Furthermore, when a plurality of liquid crystal panels were used, it was possible to obtain a liquid crystal display device with a narrow interval between display parts and a high display quality with continuous display. Furthermore, in the case of a dot matrix type liquid crystal display, it was possible to display moving characters in an electronic bulletin board type without any unnatural feeling.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional liquid crystal panel, Fig. 2 is a plan view of a conventional liquid crystal panel, Fig. 3 is a plan view showing an example of four liquid crystal panels according to the present invention, and Fig. 4 is a plan view of a conventional liquid crystal panel. FIG. 5 is a partial sectional view showing an example of a liquid crystal panel according to the invention, and FIG. 5 is a plan view showing an example of a display section of a liquid crystal display device using a plurality of liquid crystal panels according to the invention. 11.12.31.32...Substrate, 13.33...
Surface sealing material, 14.34...Liquid crystal, 15.35...
Liquid crystal injection port sealing material, 36... Thin plate for sealing, 37...
Side sealing material, 38...Fixing adhesive part. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 3 Figure 4 Figure 5

Claims (7)

[Claims] (1) Is the liquid crystal t4 formed by holding the liquid crystal between at least two substrates and sealing the periphery? 1. A liquid crystal display device using a panel, characterized in that a side sealing portion having a thin sealing plate adhered to a side surface of the substrate is provided as a sealing portion for at least a portion of the liquid crystal panel. (2) The liquid crystal display device according to claim 1, wherein the liquid crystal panel is a liquid crystal panel in which the thin plate for sealing is made of at least one of a metal plate, a glass plate, and a polymer film. (3) The liquid crystal display device according to claim 1, wherein a liquid crystal panel is used as the liquid crystal panel, in which a fixing adhesive portion for fixing the substrates is provided in the gap between the substrates. (4) The liquid crystal according to claim 3, characterized in that the fixing adhesive portion is a spacer for defining a gap between the substrates, the surface of which is coated with a heat-fusible resin or a thermosetting resin. Display device. (5) The liquid crystal display device according to claim 3, characterized in that the fixing adhesive portion uses particles larger than a spacer having heat-fusible or thermosetting properties. (6) The liquid crystal display device according to claim 1, wherein a plurality of liquid crystal A4 panels are used as the liquid crystal panel, the liquid crystal panels being arranged in-plane so that the side sealing portions are adjacent to each other. (7) The liquid crystal display device according to claim 6, characterized in that a liquid crystal display panel having a dot matrix display method is used as the liquid crystal/mother panel.