JP3210443B2 - 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 structure of a liquid crystal display device.

[0002]

2. Description of the Related Art A liquid crystal display device has a basic structure as shown in FIG. 8 in which two glass substrates 1 provided with an alignment film 3 on a plurality of transparent electrodes 2 are provided with a sealing material 4 and a spacer ( (Not shown), a liquid crystal cell body in which liquid crystal is injected into a region surrounded by the sealing material 4, and a polarizing plate (not shown) arranged outside the liquid crystal cell body are combined. Created.

The glass substrate 1 on which the transparent electrode 2 and the alignment film 3 are formed may have other layers in more detail. That is, FIG.
FIG. 2 is a structural diagram showing an example in which an insulating layer 5 is provided between the alignment layer 3 and the alignment film 3. FIG. 9B shows an example in which a color filter 8 and a light shielding layer 7 are provided on the glass substrate 1 and an insulating layer 6 is provided between the color filter 8 and the light shielding layer 7 and the transparent electrode 2. It is a structural drawing. Of course, in FIG. 9B, there may be a structure having the insulating layer 5 between the transparent electrode 2 and the alignment film 3, and FIG.
An insulating layer other than that shown in FIG.

[0004] These insulating layers 5 and 6 are usually used for the purpose of improving the flatness of the alignment film 3 or for insulating between layers.

[0005] A liquid crystal display device having the structure as described above.
Is often a problem when the electrodes are broken due to static electricity.
This is breakage or deterioration of the characteristics of the liquid crystal. Electrostatic problems can damage the electrode film.
Always occurs after separating and forming electrodes by
However, it tends to occur frequently during the rubbing treatment of the alignment film 3 in particular.
No.

Conventionally, as a measure against static electricity during rubbing,
A method of adjusting the conditions of the rubbing environment, such as humidification during rubbing, has been mainly used. However, the problem of static electricity can always occur not only during rubbing but also in subsequent steps. For example, if the static electricity is unevenly distributed at the time of spraying the spacer, the spacer is abnormally distributed. In addition, static electricity is also generated when the polarizing plate is adhered, and the threshold voltage of the liquid crystal changes.

[0007] Very recently, as is in the JP-A-4-204687 (the document 1), the transparency electrode 2 double <br/> number on the same substrate in the non-display area portion, such as light A method of contacting a material whose electrical resistance changes due to external energy,
Alternatively, a method has been proposed in which the sealing material 4 contains a material whose electric resistance changes due to external energy.

[0008] However, the method proposed in the above-mentioned Document 1 uses a material whose insulating property changes due to external energy, so that static electricity is charged depending on conditions, leading to destruction.
If not, there may be various adverse consequences. Also
When a material whose insulating property is changed by light is used as in the embodiment of Document 1, the material must be shielded from light when the liquid crystal is turned on, which is extremely problematic in panel lighting inspection and the like. was there. Avoid such inconveniences
For this purpose, always shorten multiple electrodes with high-resistance short-circuit members.
It is desirable that such an invention be disclosed in Japanese Patent Application Laid-Open No. 62-6 / 1987.
No. 5455 (Reference 2). I
However, in the examples of References 1 and 2, both of the examples after the electrode formation are short.
Since the entanglement member is provided, static electricity is generated during that time.
In no case, there was no effect. Furthermore, Reference 1, Reference
In the second invention, since the short-circuit portion is localized, instantaneous electrostatic
The distribution of charge becomes uneven against the generation of
There is a possibility that a high electric field may be generated far from the place.
Was.

[0009]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a liquid crystal display device in which the problem of static electricity hardly occurs regardless of external conditions.

[0010]

A first means used by the present invention to solve the problem is that a plurality of the transparent electrodes 2 on the same substrate 1 are always short-circuited by a high-resistance short-circuit member 9. , second means via respective transparent electrodes wherein between second sealing material 4, or short-circuit member 10 on the two substrates 1 to be combined so as to face, a short circuit at all times with a high-resistance Kotodea
Third means is to move the short-circuit member 9 from the transparent electrode 2
Is also provided at a level closer to the substrate 1,
Means for covering the short-circuit member 9 with a transparent material covering almost the entire surface of the substrate 1.
The fifth means is to place the short-circuit member 9 in front.
A part of the following transparent electrode layer 12 forming the transparent electrode 2
The sixth means is to make the short-circuit member 9 lower in insulating property.
The substrate 1 itself.

[0011]

SUMMARY OF] According to the first means, even when rubbed the alignment layer 3, between a plurality of transparent electrodes 2 on the same substrate 1 will be short-circuited by the short-circuit member 9, transparent to near charge distribution between the electrodes 2 becomes uniform, do not occur electrostatic discharge, and in accordance with the second means, between each of the transparent electrodes 2 on the two substrates that combine to oppose 1 the sealing material 4 also It is via a short-junction material 10, in order to short-circuit all the time have a high resistance, it is not possible to generate the problems caused by static electricity is also not have to pay special attention to the treatment of Ri taken in in the subsequent steps. According to the third means, the transparent electrode 2 has a shape.
When formed, these transparent electrodes 2 already have high resistance.
Short circuit, and the static electricity problem is greatly improved.
It is. According to the fourth means, rapid generation of static electricity
Also, since non-uniform charge distribution does not occur between the transparent electrodes 2,
Further, safety is improved. According to the fifth means, the short circuit
The member 9 is formed at the same time when the transparent electrode 2 is formed.
Therefore, the process is simplified. According to the sixth means, the short circuit
A special process for providing the member 9 is not required.

[0012]

FIG. 1 is a structural view showing a first embodiment of the present invention, wherein a plurality of transparent electrodes 2 are provided between the substrate 1 and the plurality of transparent electrodes 2 so as to be in contact with the plurality of transparent electrodes 2. FIG. 2 is a structural diagram showing an example in which two substrates having a short-circuit member 9 made of a material having a reduced insulation property (hereinafter referred to as a low-insulation material for simplicity) are provided on the entire surface of the substrate 1 with a sealing material 4 is there.

Depending on the specifications of the display device, one of the substrates 1
There is no problem of static electricity in the substrate 1.
There is a case where it is not necessary to provide the short-circuiting member 9 in the first embodiment. Figure 2 is a book
This is a second embodiment of the present invention, in which an electrostatic force is applied to one substrate 1.
In the case where the problem of the air is minor,
An example in which the substrate 1 is not provided on the entire surface but is selectively provided.
It is.

In FIG. 1 and FIG. 2, as the sealing material 4, a low insulating material or an anisotropic conductive sealing material can be used. In this case, the transparent electrodes 1 on the two substrates are connected to each other with high resistance.

FIG. 3 is a structural view showing a third embodiment of the present invention, wherein a plurality of transparent electrodes 2 and the substrate 1
The provided circuit member 9 so as to be in contact with the transparent electrodes 2 of the plurality of further said shorting member 9 and the other of said short-circuit member 9 on the substrate 1 on one substrate 1 at the outer side of the sealing member 4, a short circuit FIG. 3 is a structural diagram showing an example in which a short circuit occurs due to a member 10.

[0016] The short-circuit member 10 in FIG. 3 is different from the sheet <br/> Lumpur material 4, since the purpose is not to seal, the group
It is not necessary to provide it all around the board 1. Therefore, for example,
Of the high-resistance short-circuit member 9 at an appropriate position outside the
If the structure is such that a part is extended and exposed, the short-circuit member 1
0 is a good conductive material (for example, conductive adhesive, conductive resin)
Metal, metal, etc.) and the sealing material 4
Uses materials with the best properties for their intended purpose only
Because it can do things, it is convenient in manufacturing. Of course in this case
It does not limit that the short-circuit member 10 has good conductivity.
No.

FIG. 4 shows a fourth embodiment of the present invention, and is a process diagram showing an example of a process for forming the short-circuit member 9. As shown in FIG. FIG.
2A, the high-resistance short-circuit member 9 is provided on the substrate 1.
And a transparent electrode layer 12 for forming the transparent electrode 2 is further provided thereon. Next, as shown in FIG. 4B, the transparent electrode layer 12 is processed by etching or the like to form the transparent electrode 2, on which the alignment film 3 is provided. With this configuration, even if the alignment film 3 is rubbed, the plurality of transparent electrodes 2 are short-circuited with high resistance by the layer of the short-circuit member 9, so that the charge distribution between the transparent electrodes is reduced. Uniform and no electrostatic discharge occurs.

FIG. 5 shows a fifth embodiment of the present invention, and is a process diagram showing an example of a process for producing the short-circuit member 9. As shown in FIG. FIG.
1A, a transparent electrode layer 12 for forming a transparent electrode 2 is provided on the substrate 1. FIG. Next, as shown in FIG. 5 (b), the said transparent electrode layer 12 was treated by etching or the like
When forming the transparent electrode 2, the transparent electrode 2 is completely
Without separation, a very thin transparent electrode layer remains between each transparent electrode 2
Process as follows. The thin transparent electrode layer has a high resistance portion 19
And functions as the short-circuit member 9. The alignment film 3 is provided on this structure . With such a configuration, even if the alignment film 3 is subjected to the rubbing treatment, the gap between the plurality of transparent electrodes 2
Because it is short-circuited by the high resistance portion 19, KakuToru
The charge distribution between the bright electrodes 2 becomes uniform, and no electrostatic discharge occurs.

In the embodiment of FIG. 5, the sheet resistance ra of the transparent electrode 2 is desirably as small as possible, while the sheet resistance rb of the high-resistance portion 19 needs to be at least 100 times as large as ra. . Therefore, the high resistance portion 1
9 may be extremely thin. For example, when the transparent electrode layer 12 is formed by sputtering, the etching rate of the transparent electrode layer 12 near the interface between the transparent electrode layer 12 and the glass substrate 1 is increased. Is extremely reduced, so that a sufficiently thin high resistance portion 19 can be left if the etching conditions are appropriately selected.

Further, when the transparent electrode layer 12 is formed,
By temporally controlling the components so that the resistance ratio is high near the surface of the substrate 1 and low in other parts, the thickness of the high resistance portion 19 does not need to be extremely thin.

The high-resistance portion 19 is originally a part of the transparent electrode layer 12, but can be regarded as a high-resistance short-circuit member 9 different from the transparent electrode 2.

FIG. 6 shows a sixth embodiment of the present invention and is a process diagram showing an example of a process for forming the short-circuit member 9. As shown in FIG. FIG.
1A, a transparent electrode layer 12 for forming the transparent electrode 2 is provided on the substrate 1, and the transparent electrode layer 12 is formed by etching or the like. A layer of the high-resistance short-circuit member 9 is uniformly provided thereon, and the alignment film 3 is further provided thereon. In this case, the short-circuit member 9 is
1 covers almost the entire surface, so that the layer of the short-circuit member 9 is naturally transparent.
It must be a clear layer. This transparent layer is the transparent electrode layer
By changing the generation conditions in the same way as when providing 12
You can create more. However, in this case, the third
No means was used, and the transparent electrode 2 was formed.
After that, care must be taken in handling until the layer of the short-circuit member 9 is provided.
I do. This point is the same in the embodiment of FIG.
It is.

FIG. 7 shows a seventh embodiment of the present invention.
FIG. 9A is a structural view showing an example in which the sixth embodiment is applied to the substrate 1 having the color filter 8 shown in FIG. 9B, wherein the short-circuit member 9 is provided between the transparent electrode 2 and the transparent electrode 2. It is provided between the alignment films 3. FIG. 7B shows the fourth embodiment.
9B is a structural view showing an example in which the embodiment of FIG. 9 is applied to the substrate 1 having the color filter 8 shown in FIG. 9B, wherein the short-circuit member 9 is provided between the insulating layer 6 and the transparent electrode 2. Can be

The present invention is not limited to the embodiment described above. For example, the insulating layer 5 shown in FIG.
Alternatively, it can be implemented by replacing the insulating layer 6 in FIG. 9B with a high insulating layer and using a low insulating layer (a layer made of a low insulating material; the same applies hereinafter). In the embodiment shown in FIGS. 1, 3 and 4, depending on the material of the substrate 1,
Alternatively, by treating the surface of the substrate 1, the substrate 1 itself can be used as the short-circuit member 9.

The present invention has been made to solve the above-mentioned problems.
It is not limited to performing all of the measures simultaneously. example
For example, the short-circuit member 9 according to the first means and the third means
It may only set the selection択的may be provided on the entire surface of the substrate 1 with respect to the fourth means. When the short-circuit member 9 is selectively provided on a part of the substrate 1, the short-circuit member 9 can be provided on a portion other than the display portion, and the short-circuit member 9 does not necessarily have to be transparent. When the short-circuit member 9 is provided also in the display portion, the short-circuit member 9 must be transparent.

The short-circuit member 9 can be selected from various materials regardless of whether it is organic or inorganic. For example, in addition to indium oxide, silicon oxide, silicon nitride, oxynitride, tantalum oxide, aluminum oxide, etc. Can also be used.

[0027] When said shorting material material of the transparent electrode 2 and the same type of member 9, by changing a portion for forming the transparent electrode 2, components or component ratio, and other formation conditions, Etchigure - DOO Ya Change the sheet resistance
Can be done. For example, when both the transparent electrode 2 and the short-circuit member 9 are formed of ITO (indium tin oxide), the etching rates of the two can be changed by changing the ratio of the amount of oxygen and the amount of tin during vapor deposition or sputtering and other forming conditions. , And specific resistance can be changed. In the case of the embodiment shown in FIG. 5, when the transparent electrode layer 12 is formed as described above, the resistance ratio is high near the surface of the substrate 1 and low in other portions. The formation conditions can be changed over time.

There is a problem as to what value the sheet resistance of the short-circuit member 9 should take, but a short-circuit resistance between two adjacent transparent electrodes can be considered as a guide of the sheet resistance. This short-circuit resistance must be sufficiently larger than the output resistance of the liquid crystal drive circuit, and the time constant formed by the capacitance between adjacent electrodes and the short-circuit resistance disperses static electricity in a short time. Don't be too big. If the short-circuit resistance is too large, it is impossible to effectively disperse the locally generated static electricity. If the short-circuit resistance is too small, an excessive current flows between the plurality of transparent electrodes 2 and the display device is simply Not only increases the power consumption, but also causes distortion in the drive waveform, which may cause a decrease in display quality.

The range to be selected depends on the size of the output resistance of the liquid crystal driving circuit and the size of the liquid crystal display device. For example, the value of short-circuit resistance between the two adjacent transparent electrodes is in a range from 10 kΩ to 10 gΩ, preferably from several hundred kΩ to several tens of kΩ.
It would be better to be in the range of 0 megohms.

In the present invention, the high-resistance short-circuit member 9 is used.
Is basically made of a material whose electric resistance does not change due to external energy, unlike the case of the aforementioned document 1 .
When a large number of cells are simultaneously formed on one substrate 1 , it is preferable to short-circuit a plurality of electrodes in each cell and also short-circuit the electrodes of different cells. Is good. According to the fourth means of the present invention, since the short-circuit member 9 can be formed on the entire surface of the substrate 1 , it is easy to short-circuit between electrodes of different cells. This case also includes the structure of the present application in which the plurality of electrodes 2 on the substrate 1 are short-circuited by the high-resistance short-circuit member 9.

The above description has been made with respect to a so-called simple matrix type liquid crystal panel.
The present invention is also applicable to an active panel having an FT or the like and a memory capacity structure. In this case, the present invention
Regarding only the means 3, the term “transparent electrode 2” in the above description is not necessarily required to be transparent, and is therefore simply referred to as “electrode 2”. Needless to say, one end of the memory capacity should be configured to maintain high insulation.

[0032]

As described above, according to the first means of the present invention, the plurality of transparent electrodes 2 on the same substrate 1 are always short-circuited by the high-resistance short-circuit member 9, so that the transparent electrodes 2 are not only used during rubbing. In addition, even in the subsequent steps, no problem due to static electricity occurs even if special attention is not paid to the handling of the substrate. Further, according to the second aspect of the present invention, the transparent electrodes 2 on the two substrates 1 combined in opposition are always short-circuited with high resistance via the sealing material 4 or the short-circuit member 10. Even if no special attention is paid to the handling in the subsequent steps, no problem is caused by static electricity. According to the third means, the transparent electrode 2 is shaped
When formed, these transparent electrodes 2 already have high resistance.
Short circuit, and the static electricity problem is greatly improved.
It is. According to the fourth means, rapid generation of static electricity
Also, since non-uniform charge distribution does not occur between the transparent electrodes 2,
Further, safety is improved. According to the fifth means, the short circuit
The member 9 is formed at the same time when the transparent electrode 2 is formed.
Therefore, the process is simplified. According to the sixth means, the short circuit
A special process for providing the member 9 is not required.

[Brief description of the drawings]

FIG. 1 is a structural diagram showing a first embodiment of the present invention.

FIG. 2 is a structural diagram showing a second embodiment of the present invention.

FIG. 3 is a structural view showing a third embodiment of the present invention.

FIG. 4 is a structural diagram showing a fourth embodiment of the present invention.

FIG. 5 is a structural view showing a fifth embodiment of the present invention.

FIG. 6 is a structural diagram showing a sixth embodiment of the present invention.

FIG. 7 is a structural view showing a seventh embodiment of the present invention.

FIG. 8 is a structural diagram showing a conventional structure.

FIG. 9 is a structural diagram showing a conventional structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2 Transparent electrode 3 Alignment film 4 Sealing material 5 Insulating layer 6 Insulating layer 7 Light shielding layer 8 Color filter 9 Short circuit member 10 Short circuit member 12 Transparent electrode layer 19 High resistance part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G02F 1/1337 G02F 1/1343 G02F 1/136

Claims (4)

(57) [Claims] A liquid crystal layer is provided between two substrates sealed by a sealing material, and a plurality of transparent electrodes on at least one of the substrates are constantly connected by a high-resistance short-circuit member. In a liquid crystal display device having a short-circuited structure, at least one
Of the short-circuit member 9 on the substrate 1, the transparent electrode 2 identical to
A material, a liquid crystal display device, characterized in that the thin layer from the transparent electrode 2. 2. A liquid crystal layer is provided between two substrates 1 sealed by a sealing material 4, and a plurality of electrodes on at least one substrate 1 are constantly short-circuited by a high-resistance short-circuit member 9. 1. A liquid crystal display device having a structure, comprising short-circuit means for constantly short-circuiting an electrode on one substrate 1 and an electrode on another substrate 1 with high resistance. 3. The liquid crystal display device according to claim 2 , wherein said short-circuit means comprises a high-resistance portion and a good-conductivity portion formed by said short-circuit member 9 on at least one substrate 1. 4. The liquid crystal display device according to claim 2 , wherein said short-circuit means is provided outside said sealing material.