JPH10104641A - Liquid crystal display element - Google Patents

Abstract

[PROBLEMS] To provide a liquid crystal display element which has improved moisture resistance with respect to an external connection electrode pattern, thereby achieving high reliability and reduced manufacturing cost. A transparent electrode, an electrical insulating film, and an alignment film are provided.
6 and the transparent substrate 4 on which the transparent electrode 2 and the alignment film 15 are sequentially laminated are arranged to face each other, and the display region 13 is formed by intersecting both transparent electrodes 2 and 3. And the display area 1 between the two transparent substrates 4 and 5
A sealing sealer 6 is provided around the periphery 3, a liquid crystal 8 is sealed in the sealing sealer 6, and the transparent electrode 3 is extended to form an extension 3 a. The liquid crystal display element 12 in which the protective film 17 is formed by covering the extending portion 3a with the same material at the same time that the insulating film 14 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an improvement in a liquid crystal display device.

[0002]

2. Description of the Related Art FIGS. 3 and 4 show a conventional liquid crystal display device 1. FIG. 3 is a plan view thereof, and FIG. 4 is a sectional view taken along the line XX of FIG. According to these figures, a scanning side substrate 4 and a signal side substrate 5 made of glass having transparent electrodes 2 and 3 formed on the inner surface are arranged to face each other, and a region where the transparent electrodes 2 and 3 intersect is formed. The display area. An alignment film (not shown) is provided on each of the transparent electrodes 2 and 3, and the substrates 4 and 5 are provided via a sealing sealer 6 provided with a sealant made of a thermosetting resin. The distance between the substrates is fixed by the spacers 7 and further by the spacers 7. The liquid crystal 8 is sealed between the two substrates. At least one of the substrates is provided with an electric insulating film (not shown) on at least one of the substrates so that the two transparent electrodes 2 and 3 are not short-circuited.
Is coated.

Further, the transparent electrode 2 of the signal-side substrate 5 is connected to the transparent electrode 2 of the scanning-side substrate 4 via a thermosetting paste 9 containing a conductive metal provided at the end thereof by a printing method.
Electrical continuity is achieved. 10 is a driving IC, 1
1 is an input cable.

Then, the transparent electrodes 2 and 3 and the driving IC 10
The conductor for connecting between them is formed by extending the sealing electrode 6 at the same time as the formation of the transparent electrode 3, and this extending part is indicated by 3a in the figure.

[0005]

However, according to the liquid crystal display element 1 having the above structure, the extending portion 3a of the transparent electrode is inferior in moisture resistance in an exposed state, thereby increasing reliability in terms of reliability. There's a problem.

In order to solve this problem, the extension 3a
It has been proposed to apply a protective resin on the top, but the distance between the scanning side substrate 4 and the signal side substrate 5 is about 5 to 10 μm, and therefore, the extension 3 near the sealing sealer 6 is required.
It is difficult to completely coat the portion a, and as a result, reliability has not been satisfactory.

Accordingly, the present invention has been completed in view of the above circumstances, and an object thereof is to provide an external connection electrode pattern formed by extending a transparent electrode pattern outside a sealing sealer portion on a transparent substrate. Another object of the present invention is to provide a highly reliable liquid crystal display device having improved moisture resistance.

It is another object of the present invention to provide a liquid crystal display device which achieves high reliability and reduced manufacturing cost without increasing the number of manufacturing steps.

[0009]

According to the liquid crystal display device of the present invention, one transparent substrate in which a transparent electrode pattern, an electric insulating film and an alignment film arranged in one direction are sequentially laminated is arranged in another direction. The transparent electrode pattern and the other transparent substrate on which the alignment film is sequentially laminated are arranged facing each other at a predetermined interval, and both transparent electrode patterns are crossed to form a rectangular display area. A sealant is provided around the display area between the substrates to form a sealing sealer, a liquid crystal material is sealed in the sealing sealer, and a transparent electrode pattern is formed outside the sealing sealer on one of the transparent substrates. Are extended to form an electrode pattern for external connection, and the electrical insulating film laminated on one transparent substrate is also coated on the electrode pattern for external connection.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A liquid crystal display element 12 of the present invention is shown in FIG.
FIG. FIG. 1 is a plan view, and FIG.
3 is a cross-sectional view taken along the line YY in FIG. The same parts as those of the conventional liquid crystal display element 1 are denoted by the same reference numerals.

According to these figures, a scanning-side substrate 4 and a signal-side substrate 5 made of glass having ITO transparent electrodes 2 and 3 formed on the inner surface are opposed to each other. A rectangular (square or rectangular) display area 13 is formed, and a transparent electrode pattern is extended outside the sealing sealer 6 on the signal-side substrate 5 so as to extend as the external connection electrode pattern. 3a. The transparent electrode 3 on the signal-side substrate 5 is covered with an electrical insulating film 14, and the transparent electrode 2 and the electrical insulating film 13 are covered.
Further, alignment films 15 and 16 made of a polyimide resin are provided on the substrate. The two substrates 4 and 5 are fixed via a sealing sealer 6 provided around a sealing agent made of a thermosetting resin such as an epoxy-based resin, an acrylic-based resin, or a silicone-based resin. The spacing between the substrates is made constant by the spacer 7. The liquid crystal 8 is sealed between the two substrates.

The electrical insulating film 14 is made of SiO _x , SiN
_x , TiO ₂ , ZrO ₂ , Al ₂ O ₃ , Ta ₂ O ₅ , N
It is made of b ₂ O ₃ or the like, and is coated on the extending portion 3a simultaneously with its formation. The film coated in this manner is the protective film 17.

Thus, according to the liquid crystal display element 12 having the above-described structure, since the protective film 17 is coated on the extension 3a formed outside the sealing sealer 6, the extension near the sealing sealer 6 is achieved. The portion 3a could be completely covered.

The method of manufacturing the liquid crystal display element 12 having the above structure will be described in detail.

Step A : Sputtering or vapor deposition on the scanning side substrate 4 and the signal side substrate 5 to a thickness of 500 to 3000５００.
By forming the patterns of the transparent electrodes 2 and 3 respectively, a square or rectangular display area is provided. At this time, the extension 3a is also provided at the same time as the formation of the transparent electrode 3.

Step B : The electrical insulating film 13 and the protective film 17 are coated on the transparent electrode 3 and the extension 3 a on the signal-side substrate 5. These films 13 and 17 can be simultaneously formed by coating or sputtering or vapor deposition, and a non-display region other than the display region 13 can be covered with the protective film 17 as shown in FIG. It is provided so as to exclude a connection portion of a functional element such as an IC for use.

Step C : A sealing sealer formed by laying a sealant around a line using the thermosetting resin as an adhesive resin along the periphery of the display area on the scanning substrate 4 or the signal substrate 5. Apply part 6. This application is dispenser, transfer,
Perform by printing. After this step, it is preferable to disperse a plurality of spacers 7 on one of the scanning side substrate 4 and the signal side substrate 5.

Step D : The scanning-side substrate 4 and the signal-side substrate 5 are adhered to each other via the sealing sealer 6, and are further aligned to provide a space surrounded by the sealing sealer 6, and further sealing. The sealer 6 is heated to cure them. At this time, the transparent electrode patterns of the scanning side substrate 4 and the signal side substrate 5 are individually set to be conductive through the electric transfer member 9.

Step E : The liquid crystal 8 is sealed in a space surrounded by the sealing sealer 6.

Thus, when the following steps A to E are sequentially performed as described above, the electrical insulating film 13 and the protective film 17 can be simultaneously provided in the step B. There is no need to provide a step and no separate step, and as a result, manufacturing costs can be reduced.

It should be noted that the present invention is not limited to the above embodiment, and various changes and improvements may be made without departing from the scope of the present invention.

[0022]

As described above, according to the present invention, an electrical insulating film is formed on one of the transparent substrates, and at the same time, a protective film for covering the external connection electrode pattern with the same material is provided. For the external connection electrode pattern,
A liquid crystal display device having improved moisture resistance, thereby achieving high reliability and reduced manufacturing cost was provided.

[Brief description of the drawings]

FIG. 1 is a plan view of a liquid crystal display device of the present invention.

FIG. 2 is a sectional view taken along the line YY in FIG.

FIG. 3 is a plan view of a conventional liquid crystal display device.

FIG. 4 is a sectional view taken along the line XX in FIG. 3;

[Explanation of symbols]

 2, 3 Transparent electrode 4 Scanning substrate 5 Signal side substrate 6 Sealing sealer 7 Spacer 8 Liquid crystal 10 Driving IC 3a Extension 1, 12 Liquid crystal display element 13 Display area 14 Electrical insulating film 15, 16 Alignment film 17 Protective film

Claims (1)

[Claims] 1. A transparent substrate in which a transparent electrode pattern arranged in one direction, an electrical insulating film and an alignment film are sequentially laminated, and a transparent electrode pattern and an alignment film arranged in another direction are sequentially laminated. The other transparent substrate is disposed at a predetermined interval to face the other transparent substrate, and the two transparent electrode patterns intersect to form a rectangular display area. A sealant is formed around the display area between the two transparent substrates. The sealing sealer is disposed, a liquid crystal material is sealed in the sealing sealer, and a transparent electrode pattern is extended outside the sealing sealer on one of the transparent substrates to form an external connection electrode pattern. In the liquid crystal display device thus formed, the electric insulating film laminated on one transparent substrate is also coated on an external connection electrode pattern.