JPH1124055A - Liquid crystal panel and display device using the panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light and thin liquid crystal display panel capable of performing high-precision display without spoiling high-quality display by constituting a first plate of a material whose coefficient of thermal expansion is lower, and whose rigidity is higher than those of a second base plate. SOLUTION: As to a liquid crystal panel 100; a liquid crystal layer 2 is interposed by the first base plate 1a and the second base plate 1b. An electric field 4 in parallel or in nearly parallel to the surface of the first base plate 1a is formed between comb-line or strip-like first display electrode 3a and a second display electrode 3b on the base plate 1a, and drives liquid crystal in the layer 2. The electrodes 3a and 3b, and a three-primary-color micro color filter 7 are provided on only the base plate 1a, and the base plate 1b whose coefficient of thermal expansion is higher and whose rigidity is lower than those of the base plate 1a is disposed to face oppositely to the base plate 1a so that the layer 2 is provided. Thus, the IPS system liquid crystal panel capable of realizing the high-precision display whose pixel pitch is small can be supplied without causing pixel deviation while being made light in weight, and this in thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal panel driven by an active matrix, which is used for a display device of image and character information such as OA equipment, and a display device using the same.

[0002]

2. Description of the Related Art A conventional liquid crystal panel comprises a first substrate, a second substrate facing the first substrate, and a first substrate and a second substrate.
And a liquid crystal layer made of liquid crystal injected between the two substrates after the substrates are bonded to each other. A display electrode for driving the liquid crystal (hereinafter, referred to as a “display electrode”) is formed on two substrates and is composed of opposing transparent electrodes. The display electrode has such a configuration by adopting a twisted nematic display system in which the direction of the electric field applied to the liquid crystal is set to a direction substantially perpendicular to the interface between the two substrates as an operation method of the liquid crystal panel. ing. On the other hand, a method of operating the liquid crystal with the direction of the electric field applied to the liquid crystal substantially parallel to the substrate interface (hereinafter referred to as an “IPS method”) is disclosed in, for example, JP-B-63-21907 and JP-A-5-5-5.
05247. The IPS system is characterized by obtaining a high-quality liquid crystal panel, such as having a wider viewing angle than the twisted nematic system.

Conventionally, there has been a liquid crystal panel shown in FIG. 8 that operates in the IPS mode. FIG. 8 is a partially enlarged sectional explanatory view showing an example of a conventional liquid crystal panel. The liquid crystal panel includes a first substrate 11a, a second substrate 11b, and a liquid crystal layer 12 made of liquid crystal sandwiched between the first substrate and the second substrate.
And A first display electrode 13a and a second display electrode 13b in a comb shape are formed on the first substrate 11a, and the first display electrode 13a and the second display electrode 13b are formed.
A liquid crystal in the liquid crystal layer 12 is driven by forming an electric field 14 parallel or almost parallel to the surface of the first substrate 11a. 1
5 is a thin film transistor (hereinafter, referred to as a switching element) as a switching element for generating an electric field of a desired magnitude at a desired location.
"TFT"). The TFT 15 includes, for example, a gate electrode 152, a gate insulating film 153 that covers the gate electrode 152, and an amorphous silicon film (hereinafter referred to as “a”) serving as a channel portion formed on the gate electrode 152 via the gate insulating film 153. -Si film ") 15
1 and a source electrode 15 provided on the a-Si film 151.
4 and a drain electrode 155. The first polarizing plate 16a and the second polarizing plate 16b for obtaining a display contrast according to the movement of liquid crystal molecules in the liquid crystal, and red, green, and blue for each pixel for color display. In general, a primary color micro color filter (hereinafter, referred to as “CF”) 17 is provided. However, the above-mentioned publication does not mention anything about reducing the weight and thickness of the IPS liquid crystal panel.

On the other hand, reduction in weight and thickness of a liquid crystal panel is disclosed, for example, in Japanese Patent Publication No. 5-38936. FIG. 9 shows a conventional liquid crystal panel in consideration of weight reduction and thickness reduction. FIG. 9 is an explanatory sectional view showing an example of a conventional liquid crystal panel. The liquid crystal panel includes a first display electrode 13a or a second display electrode 1 made of a transparent electrode on both the first substrate 11a and the second substrate 11b.
After the formation of 3b, the first substrate 11a and the second substrate 11b are joined and sealed with the sealing material 20 with the liquid crystal layer 12 interposed between these electrodes. The first
In order to drive a liquid crystal molecule by applying a voltage of a predetermined magnitude between the display electrode 13a and the second display electrode 13b and obtain a display contrast according to the movement of the liquid crystal molecule, the first substrate 11a and the second The first polarizing plate 16a is provided on the two substrates 11b.
Alternatively, the second polarizing plate 16b is attached. For example, by using a glass substrate as the first substrate 11a and a resin film as the second substrate 11b, it is possible to achieve a reduction in weight and thickness when two glass substrates are used as both substrates.

[0005] However, the above publication does not mention anything about the substrate configuration required to obtain high image quality by applying this to an active matrix driven IPS type liquid crystal panel. Further, a second substrate 1 such as a resin film
When a transparent electrode made of indium tin oxide (hereinafter, referred to as "ITO") is formed as a display electrode for generating an electric field in 1b, the heat resistance of the resin film is insufficient, and the substrate tends to be deformed. For example, it is difficult to reduce the surface resistance of the second display electrode to several tens of ohms or less, which causes inconvenience when realizing high-definition display.

Further, none of the publications discloses a method of installing a liquid crystal panel when a display device is formed using the liquid crystal panel.

[0007]

In the liquid crystal panel shown in FIG. 9, the first display electrode 13a or the second display electrode 13b is formed on both the first substrate 11a and the second substrate 11b. If this is applied to the IPS method shown in FIG. 8, the electric field 14 generated in parallel to the first substrate is distorted by the second display electrode facing the first substrate. As a result, there is a problem that the movement of the liquid crystal molecules that should work effectively for display is hindered, and the advantage of the IPS system such as a wide viewing angle is impaired. Further, since the process temperature for forming the TFT 15 is usually as high as 300 ° C. or higher, the TFT 15 is made of the first glass.
Generally, the CF 17 is formed on the substrate 11a, and therefore, the CF 17 is formed on the second substrate 11b made of resin.
However, since the thermal expansion coefficients of the first substrate 11a and the second substrate 11b are different from each other, there is a problem that a pixel shift occurs, and a predetermined display cannot be obtained, especially as high definition is realized.

An object of the present invention is to provide a light-weight and thin liquid crystal panel capable of high-definition display without deteriorating high display quality, which is a feature of the IPS system, and a display device using the same.

[0009]

According to a first aspect of the present invention, there is provided a liquid crystal panel comprising a first substrate and a second substrate opposed to the first substrate.
A substrate and a liquid crystal layer made of liquid crystal injected between the two substrates after the first substrate and the second substrate are bonded to each other, and on the first substrate side, with respect to the surface of the first substrate. A display electrode configured to generate a parallel or substantially parallel electric field, and an alignment film formed directly on the electrode or via an insulating film are provided, and on the second substrate side, A liquid crystal panel in which an alignment film formed directly or via an insulating film is provided on the second substrate and no display electrode is provided, wherein the first substrate is more than the second substrate. It is made of a material having a low coefficient of thermal expansion and a high rigidity.

In the liquid crystal panel according to the present invention, a color filter is formed on the first substrate.

Further, in the liquid crystal panel according to claim 3, the material of the first substrate is glass, and the material of the second substrate is resin.

Further, in the liquid crystal panel according to the fourth aspect, the material of the first substrate and the material of the second substrate are different types of glass.

Further, in the liquid crystal panel according to the fifth aspect, the second substrate is a polarizing plate.

Further, in the liquid crystal panel according to the present invention, at least one of the first substrate and the second substrate is subjected to a conductive treatment on a surface opposite to a side where the liquid crystal intervenes. It is.

According to a seventh aspect of the present invention, there is provided a liquid crystal panel, comprising: a first substrate; a second substrate facing the first substrate;
A liquid crystal layer made of liquid crystal injected between the substrates after the substrate and the second substrate are bonded to each other;
On the substrate side, a display electrode configured to generate an electric field parallel or almost parallel to the surface of the first substrate, and an alignment film formed directly or via an insulating film on the electrode. A liquid crystal panel, wherein an alignment film formed directly or via an insulating film on the second substrate is provided on the second substrate side and no display electrode is provided. The first substrate is made of a material having a smaller coefficient of linear expansion and a higher elastic modulus than the second substrate.

In the liquid crystal panel according to the present invention, a color filter is formed on the first substrate.

Further, in the liquid crystal panel according to the ninth aspect, the material of the first substrate is glass, and the material of the second substrate is a resin.

In the liquid crystal panel according to the present invention, the material of the first substrate and the material of the second substrate are different types of glass.

In the liquid crystal panel according to the present invention, the second substrate is a polarizing plate.

Further, in the liquid crystal panel according to the twelfth aspect, at least one of the first substrate and the second substrate is subjected to a conductive treatment on a surface opposite to a side where the liquid crystal is interposed. It is.

According to a thirteenth aspect of the present invention, there is provided a display device including a liquid crystal panel and driving means for driving the liquid crystal panel.
2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 1
3. The liquid crystal panel according to 2, wherein the first substrate is provided on a viewer side.

[0022]

Next, embodiments of the liquid crystal panel of the present invention and a display device using the same will be described with reference to the drawings.

Embodiment 1 The first embodiment of the liquid crystal panel of the present invention will be described with reference to the drawings.

FIG. 1 is a partially enlarged sectional explanatory view showing an embodiment of the liquid crystal panel of the present invention. LCD panel 100
Is formed by sandwiching the liquid crystal layer 2 between the first substrate 1a and the second substrate 1b. On the first substrate 1a, for example, a comb-shaped or strip-shaped first display electrode 3a and a second
A display electrode 3b is formed, and an electric field 4 parallel or substantially parallel to the surface of the first substrate 1a is formed between the first display electrode 3a and the second display electrode 3b to drive the liquid crystal in the liquid crystal layer 2. . Reference numeral 5 denotes a TFT that generates a signal electric field. The TF
T5 is, for example, the gate electrode 52 and the gate electrode 52
A gate insulating film 53 covering the upper portion, and a as a channel portion formed on the gate electrode 52 with the gate insulating film 53 interposed therebetween.
-Si film 51, source electrode 54 provided on a-Si film 51, and drain electrode 55. 6a, 6b
Are a first polarizing plate and a second polarizing plate for obtaining a display contrast according to the movement of the liquid crystal molecules in the liquid crystal layer 2.
Reference numeral 7 denotes a three-primary-color micro-color filter (hereinafter, referred to as “CF”) that is colored red, green, and blue for each pixel for color display.
It is). Reference numerals 8a and 8b denote a first alignment film and a second alignment film formed by rubbing a polyimide film, for example, for aligning liquid crystal molecules in a predetermined direction. Reference numeral 9 denotes an insulating film such as SiN. 2 is installed for the purpose of suppressing the application of the DC component of the voltage.

The second substrate 1b has a thickness of, for example, 0.2
mm, a glass substrate having a lower coefficient of thermal expansion and higher rigidity than the second substrate 1b, for example, a thickness of 0.7 mm, is used as the first substrate 1a. Table 1 shows an elastic modulus (Young's modulus), which is one parameter indicating rigidity, and a linear expansion coefficient, which is one parameter indicating thermal expansion coefficient, of the glass substrate material and the polycarbonate used in the present embodiment. . It can be seen that polycarbonate has a higher linear expansion coefficient and a lower elastic modulus than the glass substrate material.

[0026]

[Table 1]

In general, parameters representing the coefficient of thermal expansion include a coefficient of linear expansion and a coefficient of body expansion, and parameters representing the stiffness include Young's modulus, Poisson's ratio, stiffness, and bulk modulus, and the thickness is also stiff. Is one parameter. In this specification, the coefficient of linear expansion and the coefficient of body expansion are collectively defined as the coefficient of thermal expansion, and the Young's modulus, Poisson's ratio, rigidity, and bulk modulus other than the thickness are collectively referred to as elastic modulus. Shall be defined as the rate.

In this embodiment, the first display electrode 3a, the second display electrode 3b, and the CF 7 are provided only on the first substrate 1a, and the second substrate has a higher coefficient of thermal expansion and lower rigidity than the first substrate 1a. The liquid crystal layer 2 is formed with the substrate 1b facing the first substrate 1a.
Was provided. Therefore, without causing pixel shift,
An IPS-type liquid crystal panel capable of realizing high-definition display with a fine pixel pitch can be supplied in a reduced weight and a reduced thickness.

When a glass substrate is used as the first substrate, the second
Materials that can be used as the material for the substrate include, in addition to polycarbonate, acrylic resins and triacetyl cellulose shown in Table 1. Further, an IPS type liquid crystal panel that can realize high-definition display with a fine pixel pitch even between glasses, such as quartz glass as the material of the first substrate and soda-lime glass or borosilicate glass as the material of the second substrate, can be obtained. .

The liquid crystal layer 2 is made of ZLI manufactured by Merck as a liquid crystal.
−4792 (product number) to 3 of the first substrate and the second substrate
It was formed by injecting into a gap of μm. Merck's ZLI-
4792 (product number) is a phenylcyclohexane-based liquid crystal, but may be a biphenyl-based, tolan-based, pyrimidine-based or ester-based liquid crystal, or a mixture of at least two of these liquid crystals. Needless to say. Further, in the present embodiment, a liquid crystal having a positive dielectric anisotropy is used, but it is needless to say that a liquid crystal having a negative dielectric anisotropy may be used.

As the first polarizing plate 6a and the second polarizing plate 6b, EG1425DU (product number) manufactured by Nitto Denko Corporation was used, but it goes without saying that the present invention is not limited to these polarizing plates.

Further, in the present embodiment, the first alignment film 8a
Represents the first display electrode 3a via an insulating film 9 such as SiN.
And on the second display electrode 3b.
Insulating film 9 on display electrode 3a and second display electrode 3b
Is removed by etching or the like, and the first alignment film 8a is directly
When formed on the substrate 1a, there is an effect that the driving voltage of the liquid crystal panel 100 can be reduced.

Embodiment 2 FIG. Embodiment 2 of the liquid crystal panel of the present invention will be described with reference to the drawings.

FIG. 2 is a partially enlarged cross-sectional explanatory view showing another embodiment of the liquid crystal panel of the present invention. In FIG.
Reference numeral 200 denotes a liquid crystal panel, and the same reference numerals are used for the same portions as those in FIG.

The configuration of the liquid crystal panel of the present embodiment is the same as the configuration of the liquid crystal panel of the first embodiment except for the following requirements.

In this embodiment, the second substrate having a higher coefficient of thermal expansion and lower rigidity than the first substrate 1a is the second polarizing plate 6b.
It is composed of Therefore, the second substrate can be omitted,
A lighter and thinner liquid crystal panel can be supplied than the liquid crystal panel of the first embodiment.

The second polarizing plate 6b used as the second substrate is
It is EG1425DU (product number) manufactured by Nitto Denko Corporation and has a structure in which a thin film made of a vinyl polymer containing an iodine atom is sandwiched between two pieces of triacetyl cellulose having a thickness of about 100 μm. The elastic modulus and the coefficient of linear expansion of the second polarizing plate almost match those of triacetyl cellulose shown in Table 1. It is a matter of course that the polarizing plate is generally made of a resin as a main material, and is not limited to this.

Embodiment 3 Embodiment 3 of the liquid crystal panel of the present invention will be described with reference to the drawings.

FIG. 3 is a partially enlarged cross-sectional explanatory view showing still another embodiment of the liquid crystal panel of the present invention. In FIG. 3, reference numeral 300 denotes a liquid crystal panel, and the same portions as those in FIG. The configuration of the liquid crystal panel of the present embodiment is the same as the configuration of the liquid crystal panel of the first embodiment except for the following requirements. Reference numeral 10 denotes a transparent layer formed by conducting a conductive treatment on the side of the second substrate 1b where the liquid crystal layer 2 is not interposed.
It is a TO layer.

According to this embodiment, since the conductive treatment layer 10 is provided on the side of the second substrate 1b where the liquid crystal layer 2 is not interposed, the electric field generated in parallel with the surface of the first substrate 1a is
The electric field is effectively applied to the liquid crystal layer 2 without being distorted by the electric field generated at the periphery of the liquid crystal panel. Therefore, a lightweight and thin liquid crystal panel can be supplied without impairing the advantages of the IPS system such as a wide viewing angle.

In the present embodiment, the conductive treatment layer 10 is
Although provided on the substrate 1b side, the conductive processing layer 10 is provided on the first substrate 1a.
The same effect can be obtained by providing the liquid crystal layer 2 on the side where no liquid crystal layer 2 is interposed.

Embodiment 4 Embodiment 4 of the liquid crystal panel of the present invention will be described with reference to the drawings.

FIG. 4 is a partially enlarged sectional explanatory view showing still another embodiment of the liquid crystal panel of the present invention. In FIG. 4, reference numeral 400 denotes a liquid crystal panel, and the same reference numerals are used for the same portions as those in FIG. The configuration of the liquid crystal panel of the present embodiment is the same as the configuration of the liquid crystal panel of the third embodiment except for the following requirements. In the present embodiment, the first transparent conductive processing layer 10a and the second transparent conductive processing layer 10b are provided on both sides of the first substrate 1a and the second substrate 1b where the liquid crystal layer 2 is not interposed. Each of the first transparent conductive processing layer 10a and the second transparent conductive processing layer 10b is an ITO layer having a surface resistance of 1 KΩ formed by, for example, a sputtering method.

According to the present embodiment, the first transparent conductive processing layer 10a and the second transparent conductive processing layer 10b are
a and the second substrate 1b are provided on the side where the liquid crystal layer 2 is not interposed, so that the electric field generated parallel to the surface of the first substrate 1a may be distorted by the electric field generated at the periphery of the liquid crystal panel. Instead, an electric field is effectively applied to the liquid crystal layer. Therefore, a lightweight and thin liquid crystal panel can be supplied without impairing the advantages of the IPS system such as a wide viewing angle.

Embodiment 5 FIG. Embodiment 5 of the liquid crystal panel of the present invention will be described with reference to the drawings.

FIG. 5 is a partially enlarged cross-sectional explanatory view showing still another embodiment of the liquid crystal panel of the present invention. In FIG. 5, reference numeral 500 denotes a liquid crystal panel, and the same reference numerals are used for the same portions as those in FIG. The configuration of the liquid crystal panel of the present embodiment is the same as the configuration of the liquid crystal panel of the first embodiment except for the following requirements. Reference numeral 10 denotes a transparent conductive treatment layer provided on the second polarizing plate 6b, for example, an ITO layer having a surface resistance of 1 KΩ formed by a sputtering method.

According to the present embodiment, the transparent conductive layer 1
Since 0 is provided on the surface of the second polarizing plate 6b, the electric field generated parallel to the surface of the first substrate 1a is not distorted by the electric field generated at the periphery of the liquid crystal panel, and the electric field is effectively applied to the liquid crystal. Is applied. Therefore, a lightweight and thin liquid crystal panel can be supplied without impairing the advantages of the IPS system such as a wide viewing angle.

Embodiment 6 FIG. Embodiment 6 of the liquid crystal panel of the present invention will be described with reference to the drawings.

FIG. 6 is a partially enlarged sectional explanatory view showing still another embodiment of the liquid crystal panel of the present invention. 6, reference numeral 600 denotes a liquid crystal panel, and the same reference numerals are used for the same portions as those in FIG. The configuration of the liquid crystal panel of the present embodiment is the same as the configuration of the liquid crystal panel of the fifth embodiment except for the following requirements. In the present embodiment, 10a, 10
b denotes a first transparent conductive processing layer and a second transparent conductive processing layer provided on both the first polarizing plate 6a and the second polarizing plate 6b. Each of the first transparent conductive processing layer 10a and the second transparent conductive processing layer 10b is an ITO layer having a surface resistance of 1 KΩ formed by, for example, a sputtering method.

According to the present embodiment, the first transparent conductive processing layer 10a and the second transparent conductive processing layer 10b are provided on the first polarizing plate 6a and the second polarizing plate 6b, respectively.
The electric field generated parallel to the surface of the substrate 1a is not distorted by the electric field generated at the peripheral portion of the liquid crystal panel, and the electric field is effectively applied to the liquid crystal layer. Therefore,
A lightweight and thin liquid crystal panel can be supplied without impairing the advantages of the IPS system such as a wide viewing angle.

In the second, third, fourth and fifth embodiments, the ITO film was formed when the transparent conductive layer was formed. However, other antistatic agents, for example, ELEGARD (trade name, manufactured by Lion Corporation) May be applied. In addition, antistatic coating agents such as Shintrcy
on C (trade name, manufactured by Shinto Paint Co., Ltd.)) may also be used.

In the second, third, fourth and fifth embodiments, the transparent conductive treatment layer is formed on one or two of the first substrate 1a, the second substrate 1b, the first polarizing plate 6a and the second polarizing plate 6b. Is provided, but may be provided at three or more of these locations.

Further, in the above-described third, fourth, fifth and sixth embodiments, the transparent conductive processing layer is formed by the first substrate 1a, the second substrate 1
b, which is directly installed on at least one of the first polarizing plate 6a and the second polarizing plate 6b, for example, a transparent body on which an ITO film is formed, or a transparent body on which an antistatic material, for example, an elegard is applied, is provided on the first substrate. 1a, the second substrate 1b, the first polarizing plate 6a, and / or, for example, may be adhered with an adhesive, or simply sandwiched between them.

Further, in the first, second, third and fourth embodiments,
4, 5, and 6, the second alignment film 8b on the second substrate 1b side is used.
Is directly formed on the second substrate 1b, but it is possible to suppress the exudation of impurities from the second substrate 1b to the liquid crystal layer 2,
For the purpose of ensuring the flatness of the surface b, the structure may be formed through an insulating film such as an acrylic resin.

Further, the thickness of the glass substrate used in the first to sixth embodiments is 1.1 mm, 0.7 mm, and 0.1 mm.
There are 55 mm and 0.33 mm, and the first substrate and the second substrate are often selected from these and used in combination.

As described above, the combination of each substrate can be determined in consideration of the area and thickness of the glass substrate so that the first substrate has higher rigidity than the second substrate.

Embodiment 7 FIG. Embodiment 7 of the liquid crystal panel of the present invention will be described with reference to the drawings.

FIG. 7 is a perspective explanatory view showing an example of a display device for a personal computer, which is an embodiment of the display device of the present invention. In FIG. 7, reference numeral 22 denotes a backlight, which is a light source that illuminates the liquid crystal panel from behind to visually recognize the display on the liquid crystal panel. The liquid crystal panel includes a first substrate 1a, a second substrate 1b, and a liquid crystal layer (not shown).

According to the present embodiment, the liquid crystal panel is formed such that the polysulfone film, which is the second substrate 1b, faces the backlight 22 and is combined with the backlight 22 to form the housing 23.
Therefore, the user of the display device for a personal computer does not touch the polysulfone film. Therefore, it is possible to avoid a display defect caused by the deformation of the liquid crystal layer of the liquid crystal panel due to the deformation of the polysulfone film when touched by hand. Since the user touches the first substrate 1a which is a glass substrate having higher rigidity than the polysulfone film, the first substrate 1a has higher rigidity than the polysulfone film, and can suppress display defects caused by the user touching the liquid crystal panel with his / her hand. . Further, if a hard-coated product (for example, EG1425DUHC (product number) manufactured by Nitto Denko Corporation) whose surface hardness is increased by subjecting the polarizing plate to a surface treatment is used as the first polarizing plate (not shown), the display surface is improved. Scratch and deformation can be suppressed.

Although the seventh embodiment is a display device using the liquid crystal panel of the first embodiment of the present invention, the same effects can be obtained by using the liquid crystal panels of the second to sixth embodiments.

[0061]

According to the liquid crystal panel of the first aspect of the present invention,
A first substrate, a second substrate facing the first substrate, and a liquid crystal layer made of liquid crystal injected between the two substrates after bonding the first substrate and the second substrate, A display electrode configured to generate an electric field parallel or substantially parallel to the first substrate surface on the first substrate side;
An alignment film formed directly on the electrode or via an insulating film; and an alignment film formed directly on the second substrate or via the insulating film on the second substrate side. A liquid crystal panel provided with no display electrodes, wherein the first substrate is made of a material having a lower coefficient of thermal expansion and a higher rigidity than the second substrate.
Since the electric field generated on the substrate side is not trapped by the second substrate, the electric field is not distorted, and the electric field is effectively applied to the liquid crystal, so that the advantages inherent in the IPS method such as a wide viewing angle can be obtained. IPS type liquid crystal panel of high definition display without impairing the pixel and without causing pixel shift.

Further, in the liquid crystal panel according to the second aspect, since the first substrate is provided with a color filter, even if the first substrate and the second substrate have different coefficients of thermal expansion, the pixel shift is prevented. Does not occur, and a high-definition display with a fine pixel pitch can be realized.

Furthermore, in the liquid crystal panel according to the third aspect, since the material of the first substrate is glass and the material of the second substrate is resin, the weight and film of the second substrate can be reduced. A light and thin IPS type liquid crystal panel can be obtained.

In the liquid crystal panel according to the fourth aspect, since the material of the first substrate and the material of the second substrate are different kinds of glass, the liquid crystal panel has a wide viewing angle.
Without losing the advantages inherent by the PS method,
The first substrate can be combined so as to have a lower coefficient of thermal expansion and a higher rigidity than the second substrate.

In the liquid crystal panel according to the fifth aspect, since the second substrate is a polarizing plate, the process of attaching the polarizing plate to the second substrate, which was conventionally required, can be omitted. Cost reduction becomes possible. further,
A thin IPS type liquid crystal panel is obtained.

Further, in the liquid crystal panel according to the sixth aspect, at least one of the first substrate and the second substrate is subjected to a conductive treatment on a surface opposite to a side where liquid crystal intervenes. Therefore, the electric charge charged on the surface of the liquid crystal panel can be neutralized, the afterimage phenomenon that often occurs in the IPS system can be suppressed, and a liquid crystal panel with good image quality can be obtained.

According to a seventh aspect of the present invention, there is provided a liquid crystal panel, comprising: a first substrate; a second substrate facing the first substrate;
A liquid crystal layer made of liquid crystal injected between the substrates after the substrate and the second substrate are bonded to each other;
On the substrate side, a display electrode configured to generate an electric field parallel or almost parallel to the surface of the first substrate, and an alignment film formed directly or via an insulating film on the electrode. A liquid crystal panel, wherein an alignment film formed directly or via an insulating film on the second substrate is provided on the second substrate side and no display electrode is provided. Since the first substrate is made of a material having a lower linear expansion coefficient and a higher elastic modulus than the second substrate, the electric field generated on the first substrate side is not trapped by the second substrate. Since the electric field is effectively applied to the liquid crystal without distorting the electric field, the IPS
An IPS type liquid crystal panel with high definition display that does not cause pixel shift without impairing the advantages originally obtained by the method can be obtained.

In the liquid crystal panel according to the present invention, a color filter is formed on the first substrate, so that even if the first substrate and the second substrate have different coefficients of linear expansion, the pixel shift is prevented. Does not occur, and a high-definition display with a fine pixel pitch can be realized.

Furthermore, in the liquid crystal panel according to the ninth aspect, since the material of the first substrate is glass and the material of the second substrate is resin, the second substrate can be reduced in weight and can be formed into a film. A light and thin IPS type liquid crystal panel can be obtained.

Further, in the liquid crystal panel according to the tenth aspect, since the material of the first substrate and the material of the second substrate are different types of glass, there is an advantage inherently obtained by the IPS method such as a wide viewing angle. The first substrate can be combined so as to have a lower coefficient of linear expansion and a higher elastic modulus than the second substrate without damage.

Further, in the liquid crystal panel according to the eleventh aspect, since the second substrate is a polarizing plate, the process of attaching the polarizing plate to the second substrate, which was conventionally required, can be omitted. Cost reduction becomes possible. Further, a thin IPS type liquid crystal panel can be obtained.

Further, in the liquid crystal panel according to the twelfth aspect, at least one of the first substrate and the second substrate is subjected to a conductive treatment on a surface opposite to a side on which liquid crystal is interposed. Therefore, the electric charge charged on the surface of the liquid crystal panel can be neutralized, the afterimage phenomenon that often occurs in the IPS system can be suppressed, and a liquid crystal panel with good image quality can be obtained.

A display device according to a thirteenth aspect of the present invention is a display device comprising a liquid crystal panel and driving means for driving the liquid crystal panel.
2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 1
2. The liquid crystal panel according to 2, wherein the first substrate is disposed on the viewer side, so that the viewer does not touch the second substrate and frequently occurs when the second substrate is formed into a film. Display defects due to deformation of the liquid crystal panel, and scratches and deformation of the display surface can be suppressed.

[Brief description of the drawings]

FIG. 1 is a partially enlarged cross-sectional explanatory view showing one embodiment of a liquid crystal panel of the present invention.

FIG. 2 is a partially enlarged cross-sectional explanatory view showing another embodiment of the liquid crystal panel of the present invention.

FIG. 3 is a partially enlarged cross-sectional explanatory view showing still another embodiment of the liquid crystal panel of the present invention.

FIG. 4 is a partially enlarged cross-sectional explanatory view showing still another embodiment of the liquid crystal panel of the present invention.

FIG. 5 is a partially enlarged cross-sectional explanatory view showing still another embodiment of the liquid crystal panel of the present invention.

FIG. 6 is a partially enlarged cross-sectional explanatory view showing still another embodiment of the liquid crystal panel of the present invention.

FIG. 7 is an explanatory perspective view showing one embodiment of the liquid crystal device of the present invention.

FIG. 8 is a partially enlarged sectional explanatory view showing an example of a conventional liquid crystal panel.

FIG. 9 is an explanatory sectional view showing an example of a conventional liquid crystal panel.

[Explanation of symbols]

1a, 11a first substrate, 1b, 11b second substrate,
2, 12 liquid crystal layer, 3a, 13a first display electrode, 3
b, 13b Second display electrode, 4, 14 Electric field, 5, 1
5 TFT, 6a, 16a First polarizing plate, 6b, 16b
Second polarizing plate, 7, 17 CF, 9 insulating film, 10 a
1st transparent conductive processing layer, 10b 2nd transparent conductive processing layer, 1
8a first alignment film, 18b second alignment film, 20 sealing material, 22 backlight, 23 housing, 51, 151
a-Si film, 100, 200, 300, 400, 50
0,600 liquid crystal panel, 700 display device.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shin Tabata 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Masaya Mizunuma 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Rishi Electric Co., Ltd. (72) Inventor Akira Tamaya 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Yasuhiro Morii 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric (72) Inventor Masayuki Fujii 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Yasuo Fujita 997 Miyoshi, Nishi-Koshi-cho, Kikuchi-gun, Kumamoto Prefecture Advanced Display Co., Ltd.

Claims (13)

[Claims] 1. A first substrate and a second substrate facing the first substrate.
A substrate and a liquid crystal layer made of liquid crystal injected between the two substrates after the first substrate and the second substrate are bonded to each other, and on the first substrate side, with respect to the surface of the first substrate. A display electrode configured to generate a parallel or substantially parallel electric field, and an alignment film formed directly on the electrode or via an insulating film are provided, and on the second substrate side, A liquid crystal panel in which an alignment film formed directly or via an insulating film is provided on the second substrate and no display electrode is provided, wherein the first substrate is more than the second substrate. A liquid crystal panel made of a material with low coefficient of thermal expansion and high rigidity. 2. The liquid crystal panel according to claim 1, wherein a color filter is formed on the first substrate. 3. The liquid crystal panel according to claim 1, wherein the material of the first substrate is glass, and the material of the second substrate is resin. 4. The liquid crystal panel according to claim 1, wherein the material of the first substrate and the material of the second substrate are different types of glass. 5. The liquid crystal panel according to claim 1, wherein the second substrate is a polarizing plate. 6. The liquid crystal panel according to claim 1, wherein a surface of at least one of the first substrate and the second substrate on a side opposite to a side where liquid crystal is interposed is subjected to a conductive treatment. 7. A first substrate and a second substrate facing the first substrate.
A substrate, and a liquid crystal layer made of liquid crystal injected between the two substrates after bonding the first substrate and the second substrate together. A display electrode configured to generate a parallel or substantially parallel electric field, and an alignment film formed directly on the electrode or via an insulating film are provided, and on the second substrate side, A liquid crystal panel in which an alignment film formed directly or via an insulating film is provided on the second substrate and no display electrode is provided, wherein the first substrate is more A liquid crystal panel made of a material having a small coefficient of linear expansion and a large elastic modulus. 8. The liquid crystal panel according to claim 7, wherein a color filter is formed on the first substrate. 9. The liquid crystal panel according to claim 7, wherein a material of said first substrate is glass, and a material of said second substrate is resin. 10. The liquid crystal panel according to claim 7, wherein the material of the first substrate and the material of the second substrate are different types of glass. 11. The method according to claim 7, wherein the second substrate is a polarizing plate.
Or the liquid crystal panel of 8. 12. The liquid crystal panel according to claim 7, wherein at least one of the first substrate and the second substrate is subjected to a conductive treatment on a surface opposite to a side on which liquid crystal intervenes. 13. A display device comprising a liquid crystal panel and driving means for driving the liquid crystal panel, wherein the liquid crystal panel is a liquid crystal panel. 9,
13. The display device according to 10, 11, or 12, wherein the first substrate is provided on a viewer side.