JP2000275671A - Liquid crystal device, production of liquid crystal device and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent irregularities in liquid crystal display due to exposure of an overcoat layer in a liquid crystal device, having such a structure that an insulating layer is formed in an extended part of a substrate by using an overcoat layer and an alignment film, formed in the liquid crystal region of the substrate, and that electrolytic corrosion in an extended part of an electrode present in this region is prevented. SOLUTION: While an overcoat layer 8a and an alignment film 9a are formed in the liquid crystal region of a substrate 3a, a first insulating layer 14a and a second insulating layer 14b are formed at a same time on the surface of an extended part H of the substrate to cover an extended part 7c of electrodes 7a, 7b, so as to prevent electrolytic corrosion in the extended part 7c of the electrode. Although the first insulating layer 14a is normally made of a material which is easily damaged by rubbing, the first insulating layer 14a is completely covered with the second insulating layer 14b, so that the production of scratch chips can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling characters or numerals,
The present invention relates to a liquid crystal device that displays information such as a picture. Further, the present invention relates to a manufacturing method for manufacturing the liquid crystal device. The present invention also relates to an electronic device including the liquid crystal device.

[0002]

2. Description of the Related Art At present, liquid crystal devices are widely used in electronic devices such as portable telephones and portable information terminals. In many cases, the liquid crystal device is used to display information such as characters, numbers, and patterns.

In this liquid crystal device, pixels are generally formed by intersecting a scanning electrode formed on one substrate with a selection electrode formed on the other substrate at a plurality of points in a dot matrix. By selectively changing the applied voltage, light passing through the liquid crystal included in the pixel is modulated, and an image such as a character is displayed.

In this liquid crystal device, at least one of the substrates has a substrate overhang extending outside the liquid crystal region, and the scanning electrodes and selection (data) electrodes extend from the liquid crystal region to the substrate overhang. It is common to have a resident portion. The liquid crystal driving IC and other external circuits additionally connected to the liquid crystal device are connected to the extending portions of the scanning electrode and the selection electrode at the substrate overhang.

[0005] In the liquid crystal device having such a structure, there has been a problem that electric erosion is generated in the extending portion of each electrode located at the substrate overhang portion. This electrolytic corrosion is a phenomenon in which the electrodes are corroded and depleted due to the interaction of the base, the potential difference between the electrodes, the water vapor in the air, and the like existing in the substrate overhang, and this electrolytic corrosion occurs. In addition, problems such as line-shaped non-lighting due to electrode disconnection occur.

In order to prevent such electrolytic corrosion, conventionally, S
There is known a structure in which a mold material such as i (silicon) is applied to the surface of the substrate overhang by coating or the like to cover the extended portions of the electrodes, thereby eliminating the influence of water vapor in the air. However, in such a method of attaching a mold material, due to the properties of the mold material itself and the difficulty of attaching the mold material,
It was difficult to completely prevent electrolytic corrosion.

Conventionally, when an insulating layer is formed on a liquid crystal region of a substrate, the same material is used to form an insulating layer on the surface of the substrate overhanging portion, thereby causing electrolytic corrosion on the electrodes on the substrate overhanging portion. A liquid crystal device for preventing such a situation is disclosed in, for example, Japanese Patent Application Laid-Open No. 64-38726. In particular, in this liquid crystal device, an insulating layer is formed on the surface of the substrate extension using two layers of an overcoat layer and an alignment film formed on the electrode in the liquid crystal region.

[0008]

However, in the liquid crystal device disclosed in Japanese Patent Application Laid-Open No. 64-38726,
The entire surface of the overcoat layer was not covered with the alignment film, and there were places where the overcoat layer was partially exposed to the outside of the alignment film. In such a conventional liquid crystal device, during a rubbing process performed to impart an alignment property to an alignment film, an overcoat layer exposed to the outside is scraped off during the rubbing process, and the stripped removal pieces are removed. As a result, streak-like dirt and scratches remain on the alignment film in the liquid crystal region, and as a result, there is a problem that display unevenness occurs when the liquid crystal device is driven.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has an object to form an insulating layer on a substrate overhang using an overcoat layer and an alignment film formed in a liquid crystal region of a substrate. It is an object of the present invention to prevent liquid crystal display unevenness due to stripping of an overcoat layer from occurring in a liquid crystal device in which electrolytic corrosion of an electrode extending portion existing in the portion is prevented.

[0010]

(1) In order to achieve the above object, a liquid crystal device according to the present invention comprises a pair of substrates opposed to each other with a liquid crystal interposed therebetween and provided with electrodes on opposed surfaces; An overcoat layer formed thereon, and an alignment film formed on the overcoat layer, wherein at least one of the pair of substrates has a substrate overhanging portion extending outside the other substrate. Wherein the electrode has a portion extending to the substrate overhang portion,
A first insulating layer formed simultaneously with the formation of the overcoat layer is provided on the substrate overhanging portion so as to cover the extended portion of the electrode, and the first insulating layer has the orientation on the first insulating layer. A second insulating layer is provided which is formed simultaneously with the formation of the film, and the first insulating layer is entirely covered by the second insulating layer.

According to the liquid crystal device having this structure, the insulating layer is formed on the overhanging portion of the substrate by using the overcoat layer and the alignment film formed in the liquid crystal region of the substrate. As compared with the case where a molding material such as Si or the like is attached to the overhang portion, electrolytic corrosion of the electrode extension portion existing at the substrate overhang portion can be reliably prevented.

Further, since the entire surface of the first insulating layer formed using the overcoat layer is covered with the second insulating layer formed using the alignment film, the first insulating layer formed of the same quality as the overcoat layer is covered. There is no portion where the first insulating layer is exposed to the outside, and therefore, when the rubbing process is performed on the alignment film having the same quality as the second insulating layer, the first insulating layer is not damaged by the rubbing process. Therefore, it is possible to prevent the alignment film from being stained, and as a result, to prevent the liquid crystal display from becoming uneven.

(2) In order to achieve the above object, a liquid crystal device according to the present invention comprises a pair of substrates opposed to each other with a liquid crystal interposed therebetween and having electrodes on opposed surfaces, and an over-layer formed on the electrodes. A coating layer, and an alignment film formed on the overcoat layer, at least one of the pair of substrates has a substrate overhanging portion that extends outside the other substrate, and the electrode is In a liquid crystal device having an extending portion extending to a substrate overhang, the electrode has a region covered with the overcoat layer on both the opposing surface and the substrate overhang, and all of the region is the alignment film. Characterized by being covered by

According to the liquid crystal device having this configuration, the overcoat layer region covering the electrode is present on both the opposing surface of the substrate and the overhanging portion of the substrate, and the entire region is covered with the alignment film. When the overcoat layer is exposed to the outside and has no exposed surface, and the rubbing treatment is performed on the alignment film, the rubbing treatment may cause the cloth or the like used for rubbing to directly contact the overcoat layer and cause friction. Since there is no overcoat layer, the alignment film is not damaged by the shaved powder (dust). Therefore, generation of dirt and scratches on the alignment film can be prevented, and as a result, non-uniformity of liquid crystal display can be prevented.

(3) In the liquid crystal device having the above structure, the overcoat layer and the first insulating layer can be formed of silicon oxide or titanium oxide or a mixture containing at least one of the above, and the alignment film and the second insulating layer Can be formed of a polyimide resin.

(4) Next, in the method for manufacturing a liquid crystal device according to the present invention, at least one of the substrates has an overhanging portion projecting to the outside of the other substrate. An electrode forming step of forming an electrode, a first insulating layer forming step of forming a first insulating layer on the overhang layer while forming an overcoat layer on a facing surface of the substrate having the overhang section, Forming an alignment film on the overcoat layer on the opposing surface of the substrate and forming a second insulating layer on the overhanging portion, wherein the second insulating layer forming step includes: The second insulating layer is formed so as to cover the entire surface of the first insulating layer.

(5) Next, the electronic device according to the present invention
In an electronic apparatus having a liquid crystal device and a housing for accommodating the liquid crystal device, the liquid crystal device may be any of the above (1) to (3)
And a liquid crystal device described in (1).

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIGS. 1 and 2
Shows an embodiment of the liquid crystal device according to the present invention.
The liquid crystal device 1 has a pair of substrates 3a and 3b whose periphery is bonded to each other by a sealing material 2. These substrates 3a and 3b are made of, for example, a material such as glass,
It is formed by forming various elements on substrate materials 5a and 5b formed of a flexible film material such as plastic.

A gap formed between these substrates 3a and 3b, a so-called cell gap, is regulated by a plurality of spacers 4 to a uniform value, for example, about 5 μm.
The liquid crystal 6 is sealed in the cell gap surrounded by the sealing material 2. In FIG. 1, reference numeral 2a denotes a liquid crystal injection port formed in a part of the sealing material 2, and the liquid crystal 6 is injected into the cell gap through the liquid crystal injection port 2a. Is sealed with a resin or the like.

A first electrode 7 is provided on the liquid crystal side surface of the first substrate 3a.
is formed, an overcoat layer 8a is formed thereon, and an alignment film 9a is further formed thereon. A second electrode 7b is formed on the liquid crystal side surface of the second substrate 3b facing the first substrate 3a, and an overcoat layer 8b is formed thereon.
Is formed, and an alignment film 9b is further formed thereon.
Also, on the outer surface of each of the substrates 3a and 3b,
The polarizing plates 23a and 23b are attached.

The first electrode 7a and the second electrode 7b are, for example, I
TO (Indium Tin Oxide) is formed to a thickness of about 500 to 1500 Å, and the overcoat layers 8a and 8b are formed to a thickness of about 600 Å by using, for example, silicon oxide, titanium oxide, or a mixture thereof. The alignment films 9a and 9b are formed of, for example, a polyimide resin to a thickness of about 300 angstroms.

The first electrode 7a is formed by arranging a plurality of linear patterns parallel to each other, while the second electrode 7b is formed by arranging a plurality of linear patterns parallel to each other so as to be orthogonal to the first electrode 7a. Formed by
A plurality of points where the electrodes 7a and the electrodes 7b intersect in a dot matrix form pixels for displaying an image.

The first substrate 3a has a projecting portion H that projects outside the liquid crystal region portion E in which the liquid crystal 6 is sealed, ie, projects outside the other substrate. The first on the first substrate 3a
The electrode 7a extends as it is to the substrate overhang portion H and is formed as a wiring. Also, the second electrode 7 on the second substrate 3b
b is a conductive material 11 dispersed in the sealing material 2 (FIG. 2)
The connection with the electrode on the first substrate 3a is achieved through the substrate, and the wiring extends to the substrate overhang H.

In the present embodiment, each electrode which is electrically connected to the overhang portion H of the first substrate 3a from both of the above-described substrates and is formed as a wiring is shown as an electrode extension portion 7c. Also,
An input terminal 12 for making a connection with an external circuit is formed at an edge of the overhang portion H of the first substrate 3a.

In FIG. 1 and the drawings described hereafter, a large number of electrodes 7a and 7b and an electrode extending portion 7c are actually formed over the entire surface including the cross sections of the substrates 3a and 3b at extremely small intervals. In FIG. 1 and the like, these electrodes are schematically illustrated at intervals wider than the actual intervals in order to clearly show the structure, and some of the electrodes are not shown. Further, the electrodes 7a and 7b in the liquid crystal region portion E are not limited to being formed linearly, but may be formed in an appropriate pattern.

Although the input terminals 12 are actually formed on the side edges of the protruding portion H of the substrate 3a at a narrow fixed interval, in FIG. 1, in order to clearly show the structure, the input terminals 12 are formed at a wider interval than the actual interval. These are schematically shown, and further illustration of some terminals is omitted.

A liquid crystal driving IC 13 is bonded or mounted at an appropriate position of the substrate overhang H by an ACF (Anisotropic conductive Film) 18 as a conductive adhesive.
As is well known, the ACF 18 is a conductive polymer film used for electrically connecting the pair of terminals anisotropically and collectively connecting the terminals, such as a thermoplastic or thermosetting resin. A large number of conductive particles 21 in the film 19
Is formed by dispersing. This ACF18
The substrate overhang portion H and the liquid crystal driving IC 13 are thermocompression-bonded to each other so that the bump 22 and the electrode extension portion 7c of the liquid crystal driving IC 13 and the bump 22 and the input terminal 12
To realize a connection having a unidirectional conductivity.

The first electrode 7 is controlled by the liquid crystal driving IC 13.
a or a second electrode 7b, by applying a scanning voltage for each row, and further applying a data voltage based on a display image to each of the other electrodes for each pixel.
The light passing through each of the selected pixel portions is modulated, and an image such as a character or a number is displayed outside the substrate 3a or 3b.

FIG. 3A shows a state in which an electrode 7a, an electrode extending portion 7c and an input terminal 12 are formed on the surface of a substrate material 5a constituting one substrate 3a. Regarding the in-process product of the substrate 3a shown here, an insulating layer 14 is formed on the surface of the substrate overhang portion H so as to cover the entire electrode extension portion 7c as shown in FIG. This insulating layer 14
The first insulating layer 14a formed simultaneously when the overcoat layer 8a is formed in the liquid crystal region E of the first substrate 3a and the second insulating layer 14a formed simultaneously when the alignment film 9a is formed in the liquid crystal region E. It is formed by the two insulating layers 14b. By preventing the electrode extension 7c on the substrate overhang H from being exposed to the outside by the insulating layer 14, the occurrence of electrolytic corrosion in the electrode extension 7c is prevented. Similarly, FIG. 3B shows the other substrate 3b
2 shows a state in which an electrode 7b is formed on the surface of a substrate material 5b constituting the above. In the substrate 3b shown here, an overcoat layer 8b is formed so as to cover an electrode 7b formed in a liquid crystal region portion E which is a region overlapping with one substrate 3a.

Generally, the overcoat layer 8a is often formed of a material such as silicon oxide or titanium oxide that is harder than the polyimide constituting the alignment film 9a, and this is due to an external force during the rubbing process performed on the alignment film 9a. May be scraped off. For this reason, if a portion where the first insulating layer 14a of the same quality as the overcoat layer 8a is not covered with the second insulating layer 14b remains in the substrate overhang portion H, the first insulating layer 14a is And the shavings are removed from the liquid crystal area E
There is a possibility that the alignment film 9a in the inside may be streaked and become dirty or unnecessarily damaged, and as a result, the liquid crystal display quality may be deteriorated.

In this regard, in the present embodiment, the first insulating layer 14a of the same quality as the overcoat layer 8a is formed of the alignment film 9a.
The entire surface is covered with a second insulating layer 14b having the same quality as that of the second insulating layer 14b. In particular, as shown in FIG.
Is completely covered and wrapped by the second insulating layer 14b going down (cross section). By completely covering the entire surface of the first insulating layer 14a with the second insulating layer 14b in this manner, it is possible to reliably prevent the first insulating layer 14a from being damaged at the time of the rubbing process, and therefore to prevent the deterioration of the liquid crystal display quality. It can be reliably prevented.

The sealing material 2 for joining the first substrate 3a and the second substrate 3b is, for example, as shown in FIG.
The first substrate 3a is formed by screen printing or the like so as to surround the overcoat layer 8a and the alignment film 9a and to separate them from the insulating layer 14.

As described above, according to the present embodiment, the first
An insulating layer formed in the liquid crystal region portion E of the substrate 3a, that is, the overcoat layer 8a and the alignment film 9a are used to make the substrate 3
Since the insulating layer 14 is also formed on the overhang portion H of FIG. 1A, the entire area of the overhang portion H is covered with a mold material such as Si (silicon) after the liquid crystal panel is formed. The existing electrode extension portion 7c can be more reliably shielded from the outside, and thus the electrode extension portion 7c can be shielded.
The electrolytic corrosion of c can be more reliably prevented.

Further, the entire surface of the first insulating layer 14a is
When the first insulating layer 14a is completely covered with the insulating layer 14b, the first insulating layer 14a can be reliably prevented from being damaged during the rubbing process, so that the quality of the liquid crystal display can be reliably prevented from lowering.

FIG. 6 shows an embodiment of a method of manufacturing the liquid crystal device for manufacturing the liquid crystal device 1 shown in FIG. In this manufacturing method, the first substrate 3a includes the steps P1 to P1.
Through the process P4, a structure is formed as shown in FIG.
Specifically, the first electrode 7a, the electrode extension portion 7c, and the input terminal 12 are formed on a substrate material 5a made of glass, plastic, or the like by using a known patterning method such as a photolithography method using ITO as a material (step). P
1).

Next, as shown in FIG.
In the above, an overcoat layer 8a is formed on the first electrode 7a by, for example, offset printing, and at the same time, the overhang portion H
In the first step, the first insulating layer 14a of the insulating layer 14 is formed except for the area of the input terminal 12 and the IC mounting area J.
2). Further, an alignment film 9a is formed on the overcoat layer 8a by, for example, offset printing, and at the same time, a second insulating layer 14b is formed on the first insulating layer 14a of the insulating layer (step P3). In this case, the second insulating layer 14b is formed so as to completely cover the entire surface of the first insulating layer 14a including its edges.

Next, as shown in FIG. 5, the sealing material 2 is formed on the peripheral portion of the substrate material 5a by, for example, screen printing to partition and form the liquid crystal region portion E. Note that reference numeral 2a
Denotes a liquid crystal injection port formed in a part of the sealing material 2.

On the other hand, regarding the second substrate 3b, FIG.
As shown in (b), a second electrode 7b is formed on a substrate material 5b made of glass, plastic or the like by using a known patterning method, for example, a photolithography method using ITO as a material (step P5 in FIG. 6). The overcoat layer 8b is formed thereon by, for example, offset printing (Step P6), and then the alignment film 9b is formed thereon by, for example, offset printing, whereby the second substrate 3b is formed.

The first substrate 3a and the second substrate 3b formed as described above are generally simultaneously formed on a large-area substrate base material. Then, the first substrate 3a and the second substrate 3b are adhered to each other in a state where they are aligned, that is, aligned in the state of the substrate base material, and the sealing material 2 (see FIG. 1).
(Step P8).

Next, a large-area substrate base material is subjected to a primary break to form a liquid crystal injection port 2 a formed in a part of the sealing material 2.
(See FIG. 1) is exposed to the outside (step P9), and liquid crystal is injected into the liquid crystal region E through the liquid crystal injection port 2a, and after the injection is completed, the liquid crystal injection port 2a is sealed with a resin (FIG. 1). Step P10). Thereafter, a secondary break is performed to form the liquid crystal device 1 shown in FIG. 1 in which the liquid crystal driving IC 13 is not mounted (step P11).

Next, the ACF 18 (FIG. 1) is placed in the IC mounting area J.
), And the liquid crystal driving IC 13 is temporarily mounted thereon in an aligned state, and then thermocompression-bonded by applying pressure and heating, thereby forming the liquid crystal driving IC 1.
3 is mounted at a predetermined position on the substrate 3a (Step P12).
Further, polarizing plates 23a and 23b are attached to the outer surfaces of the substrates 3a and 3b (step P13), whereby the liquid crystal device 1 shown in FIG. 1 is completed. The external wiring board 16 is connected to the input terminal 12 at an appropriate timing thereafter.

(Second Embodiment) FIG. 7 shows a mobile phone as one embodiment of the electronic apparatus according to the present invention. The mobile phone 30 shown here has an antenna 31, a speaker 3
2, liquid crystal device 40, key switch 33, microphone 3
4 is stored in an outer case 36 as a housing. Further, inside the outer case 36, a control circuit board 37 on which a control circuit for controlling the operation of each of the above-described components is mounted is provided. As the liquid crystal device 40, the liquid crystal device 1 shown in FIG. 1 can be used.

In this portable telephone 30, the key switch 3
Signals input through the microphone 3 and the microphone 34, received data received by the antenna 31, and the like are input to the control circuit on the control circuit board 37. Then, the control circuit displays an image such as a number, a character, or a picture on the display surface of the liquid crystal device 40 based on the various input data, and transmits transmission data from the antenna 31.

(Other Embodiments) The present invention has been described with reference to the preferred embodiments. However, the present invention is not limited to the embodiments, and various modifications may be made within the scope of the invention described in the claims. Can be modified.

For example, the liquid crystal device shown in FIG.
ip On Glass) type liquid crystal device, that is, a liquid crystal device with a structure in which a liquid crystal driving IC is directly mounted on a substrate.
The present invention can be applied to a liquid crystal device that does not directly mount a liquid crystal driving IC on a substrate. Although a simple matrix type liquid crystal device is considered in FIG. 1, an active matrix type liquid crystal device can be used instead.

In the embodiment shown in FIG. 1, the substrates 3a and 3
The present invention is applied to a liquid crystal device having a structure in which a liquid crystal driving IC is mounted on only one of the substrates b, that is, a structure in which the electrode extension portion 7c is formed on only one substrate. , For example, a liquid crystal device having a structure in which a liquid crystal driving IC is mounted on both substrates 3a and 3b.

Further, in the embodiment of FIG. 7, the case where the liquid crystal device of the present invention is used in a portable telephone as an electronic device is exemplified. However, the liquid crystal device of the present invention is applicable to any other electronic device, for example, a portable information terminal. It can also be applied to a device, an electronic organizer, a finder of a video camera, and the like.

[0048]

According to the liquid crystal device, the method of manufacturing the liquid crystal device, and the electronic apparatus of the present invention, the insulating layer is formed on the overhang portion of the substrate by using the overcoat layer and the alignment film formed in the liquid crystal region of the substrate. Since it is formed, it is possible to reliably prevent electrolytic corrosion of the electrode extension portion existing in the substrate overhang portion, as compared with a case where a mold material such as Si is attached to the substrate overhang portion after the liquid crystal panel is formed.

Further, since the entire surface of the first insulating layer formed by using the overcoat layer is covered by the second insulating layer formed by using the alignment film, the first insulating layer is formed of the same quality as the overcoat layer. There is no portion where the first insulating layer is exposed to the outside, and therefore, when the rubbing process is performed on the alignment film having the same quality as the second insulating layer, the first insulating layer is not damaged by the rubbing process. Therefore, it is possible to prevent the alignment film from being stained, and as a result, to prevent display unevenness from occurring in the liquid crystal device.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a liquid crystal device according to the present invention, partially cut away.

FIG. 2 is a side sectional view showing a sectional structure of a main part of the liquid crystal device of FIG.

FIG. 3A is a plan view illustrating an example of a shape of an electrode formed on one substrate included in the liquid crystal device illustrated in FIG. (B) is a plan view showing an example of the shape of an electrode formed on the other substrate constituting the liquid crystal device facing (a).

FIG. 4 is a plan view showing a state in which an insulating layer is formed on the surface of the workpiece in process shown in FIG. 3;

FIG. 5 is a plan view showing a state in which a sealing material is formed on the surface of the substrate work-in-progress shown in FIG. 4;

FIG. 6 is a process chart showing one embodiment of a method for manufacturing a liquid crystal device according to the present invention.

FIG. 7 is a perspective view showing an embodiment of an electronic device according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 liquid crystal device 2 sealing material 3a first substrate 3b second substrate 5a, 5b substrate material 6 liquid crystal 7a first electrode 7b second electrode 8a, 8b overcoat layer 9a, 9b alignment film 14 insulating layer 14a first insulating layer 14b first 2 Insulation layer E Liquid crystal area H Substrate overhang J IC mounting area

Continued on the front page F term (reference) 2H090 HA03 HB03X HB06X HC01 HC10 HC17 HC18 HC19 HD05 HD14 JB02 JC17 JD14 KA05 MA04 MB03 2H092 GA05 GA35 GA43 GA60 HA25 HA28 MA32 MA35 MA37 NA01 NA15 NA17 NA25 NA27 NA30 PA02 QA07 AA4A CA19 DA09 DA15 DB01 EA04 EA05 EB02 ED20 FA01 FA02 FB01 FB02 FB15 GB10

Claims (5)

[Claims] 1. A pair of substrates facing each other with a liquid crystal interposed therebetween and having electrodes on opposite surfaces, an overcoat layer formed on the electrodes, and an alignment film formed on the overcoat layer. A liquid crystal device having at least one substrate of the pair of substrates having a substrate overhang extending outside the other substrate; and the electrode having an extending portion extending to the substrate overhang. A first insulating layer formed simultaneously with the formation of the overcoat layer so as to cover the extended portion of the electrode; and forming the alignment film on the first insulating layer. A second insulating layer formed at the same time as the first insulating layer is provided, and the entire surface of the first insulating layer is covered by the second insulating layer. 2. A pair of substrates facing each other with a liquid crystal interposed therebetween and having electrodes on opposite surfaces, an overcoat layer formed on the electrodes, and an alignment film formed on the overcoat layer. Wherein at least one of the pair of substrates has a substrate overhang extending outside the other substrate, and the electrode has an extending portion extending to the substrate overhang. A liquid crystal device having a region both covered with the overcoat layer on both the opposing surface and the substrate overhang, and the entire region is covered with the alignment film. 3. The overcoat layer and the first insulating layer according to claim 1, wherein the overcoat layer and the first insulating layer are formed of silicon oxide or titanium oxide or a mixture containing at least one of the silicon oxide and the titanium oxide. A liquid crystal device, wherein the layer is formed of a polyimide resin. 4. An electrode forming step of forming electrodes on respective surfaces of a pair of substrates facing each other with at least one substrate having an overhanging portion overhanging the other substrate; and a substrate having the overhanging portion. Forming an overcoat layer on the opposite surface of the substrate and forming a first insulating layer on the overhang portion; and forming an alignment film on the overcoat layer on the opposite surface of the substrate having the overhang portion. And a second insulating layer forming step of forming a second insulating layer on the overhanging portion. In the second insulating layer forming step, the second insulating layer is formed so as to cover the entire surface of the first insulating layer. A method for manufacturing a liquid crystal device, wherein an insulating layer is formed. 5. An electronic apparatus comprising a liquid crystal device and a housing for accommodating the liquid crystal device, wherein the liquid crystal device is constituted by the liquid crystal device according to claim 1. machine.