JPH10133205A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a liquid crystal display device in which electric charges are hardly accumulated on the surface of a substrate and an after-image does not appear. SOLUTION: This device is provided with a liquid crystal layer held in between an electrode substrate 1 on which one pair of bomb type electrodes 2 on which a voltage is to be impressed is formed and an electrode 6 arranged by being confronted with the electrode substrate 1 and there are color filters 7 of three colors R, G, B and a color filter layer 8 formed on them counter electrode 6 and the device has a conductive oriented film 15 on the layer 8. Thus, a satisfactory display characteristic is obtained by making electric charges so as to be hardly accumulated on an counter substrate 5 while allowing the film 15 to have electrical conductivity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device having no image lag and good display quality.

[0002]

2. Description of the Related Art Liquid crystal display devices are widely used as display devices for watches, calculators, etc. because of their features such as thinness, light weight, and low power consumption. Especially thin film transistor (TF
T) and the like, the TN liquid crystal display device that performs active driving is applied to a display device such as a word processor or a personal computer, a television, or the like, and is being replaced by a CRT, which is the most common conventional display device. But,
This TN type liquid crystal display device generally has a problem that the viewing angle is narrow, and when viewed from an oblique direction, the contrast is lowered and the gradation is inverted. In particular, in recent years, the size of liquid crystal display devices has been increased, and there is a difference in display even when the upper, lower, left, and right ends of the display surface are viewed from the same observation point.

The deterioration of display quality when observed from an oblique direction is caused by the fact that the TN type liquid crystal display device performs display using the rising of the liquid crystal molecules due to the electric field, and the rising direction has anisotropy. It is considered. That is, when the liquid crystal molecules rising from one direction are viewed from various directions, the optical contribution thereof changes, and it is considered that a display change with respect to the viewing angle occurs. This can be said to be an essential problem of the TN type liquid crystal display device. to solve this problem,
Recently, an in-plane response type liquid crystal display device has been proposed. In this in-plane response type liquid crystal display device, a pair of comb-shaped electrodes are formed on the same substrate, and liquid crystal molecules are made to respond by an electric field parallel to the substrate surface. Since the liquid crystal molecules rotate parallel to the substrate surface along the electric field, the angle with respect to the substrate surface is small.
Therefore, when the liquid crystal molecules are viewed from various directions, the display change with respect to the viewing angle is reduced.

However, this in-plane response type liquid crystal display device has:
A pair of comb electrodes is formed on one substrate, and the other substrate (hereinafter, referred to as an opposing substrate) does not have a conductive portion. Therefore, when charge is injected by external static electricity or the like, the charge is locally accumulated on the counter substrate without being diffused or excluded outside the substrate. That is, there are places where charges are stored and places where charges are not stored. There is a difference in the rising angle of the liquid crystal molecules between the location where the charge is stored and the location where the charge is not stored. This phenomenon is recognized as an afterimage, and has a problem that display quality is significantly reduced.

FIG. 12 is a cross-sectional view of a cell of a conventional in-plane response type liquid crystal display device in which a counter substrate has no conductivity. In the figure, 1 is an electrode substrate which is a glass substrate, 2 is a pair of comb-shaped electrodes formed by patterning on the electrode substrate 1 into a desired shape, and 3 is a polyimide on the electrode substrate 1 including the comb-shaped electrodes 2. Is an alignment film formed by spin coating and baking. 5 is a counter substrate arranged to face the electrode substrate 1, 6 is a glass substrate,
Reference numeral 7 denotes a color filter of three colors R, G, and B formed on the glass substrate 6, and reference numeral 8 denotes a color filter protection layer applied on the color filter 7, and constitutes the opposite substrate 5 together with the glass substrate 6 and the color filter 7. 9 is a color filter protective layer 8
It is an alignment film formed thereon. Reference numeral 10 denotes a liquid crystal composition having a thickness of 5 μm disposed between the electrode substrate 1 and the counter substrate 5.
m of the liquid crystal layer. Reference numeral 12 denotes a charge distribution state on the liquid crystal layer 10 side of the counter substrate 5, and reference numeral 13 denotes a charge distribution state on the side opposite to the liquid crystal layer 10 of the counter substrate 5.

FIG. 13 is a pattern diagram of a comb-shaped electrode. Reference numeral 2 denotes the same pair of comb electrodes as in FIG. Next, a manufacturing process of the liquid crystal display device will be described. First, chromium was formed to a thickness of 1000 ° on the electrode substrate 1 by a sputtering method, and was patterned using a positive photosensitive resist to form a pair of comb electrodes 2. The electrode width of the comb electrode 2 is 5 μm, and the electrode interval is 5 μm.
μm. Polyimide (AL1034, manufactured by Japan Synthetic Rubber) was formed to a thickness of 800 ° on the electrode substrate 1 to form an alignment film 3. The alignment film 9 on the color filter protective layer 8 on the counter substrate 5 side is made of polyimide (AL103 made by Nippon Synthetic Rubber).
4) was used. A rubbing treatment was performed on the electrode substrate 1 and the counter substrate 5. The rubbing direction of the electrode substrate 1 was set to a direction shifted from the electrode interval direction by 0 to 45 degrees, and the counter substrate 5 was set to be in an antiparallel direction to the electrode substrate 1. The two substrates were bonded together such that the cell gap was 5 μm and the liquid crystal alignment direction was antiparallel.
A liquid crystal display device was prepared by injecting -2293. The direction of sticking the polarizing plate is such that the polarizing plate on the light incident side has its absorption axis direction aligned with the alignment direction (rubbing direction) of the liquid crystal molecules, and the emitting side polarizing plate has the other polarizing plate and its absorption axis direction. Are arranged at right angles.

When charges are injected by static electricity or the like by rubbing the surface of the liquid crystal display device, the charges are diffused on the counter substrate 5 or excluded from the outside of the substrate because the counter substrate 5 has no conductivity. Charge distribution states 12, 1
As shown in FIG. 3, charges are locally accumulated. That is, there are places where charges are stored and places where charges are not stored. There is a difference in the rising angle of the liquid crystal molecules between the place where the charge is stored and the place where the charge is not stored. It is presumed that this phenomenon is recognized as an afterimage and significantly lowers the display quality. As an example of an improvement over such a conventional liquid crystal display device, there is JP-A-8-171082, in which a conductor or a semiconductor provided in an electrically floating state on a counter substrate surrounds a display surface. In addition, this paper introduces a device that is provided in an island shape around the display surface to reduce the influence of static electricity.

[0008]

In the in-plane response type liquid crystal display device, since a pair of interdigital electrodes 2 are formed on one electrode substrate 1, charges are locally accumulated on the opposing substrate 5. In other words, there are places where electric charges are accumulated and places where electric charges are not accumulated. Then, there is a difference in the rising angle of the liquid crystal molecules between the place where the electric charge is accumulated and the place where the electric charge is not accumulated, and there is a problem that this phenomenon is recognized as an afterimage. Further, in the technique introduced in Japanese Patent Application Laid-Open No. H8-171082, the distance between the accumulated charge and the conductor is long.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has as its first object to provide a liquid crystal display device in which electric charges hardly accumulate on a substrate surface and an afterimage does not appear. It is a second object of the present invention to provide a liquid crystal display device in which the distance between a stored electric charge and a conductor is shortened so that the electric charge can be moved faster on the substrate surface.

[0010]

In a liquid crystal display device according to the present invention, a first substrate on which an electrode for controlling a display pixel is formed, and the first substrate is disposed so as to face the first substrate.
A liquid crystal layer sandwiched between a second substrate having a conductive layer over substantially the entire display surface and having a color filter colored corresponding to the display surface is provided. The conductive layer of the second substrate is provided on the first substrate. The conductive layer provided on the first substrate side of the second substrate also serves as a color filter. Furthermore, the conductive layer provided on the first substrate side of the second substrate,
This is a protective layer formed on the color filter.

The conductive layer provided on the first substrate side of the second substrate is an alignment film formed on a color filter via a protective layer. The conductive layer provided on the first substrate side of the second substrate is an ITO film formed on a color filter. Furthermore, the conductive layer provided on the first substrate side of the second substrate has a sheet resistance of 10 ⁶ to 10 ¹³ Ω. The conductive layer of the second substrate is provided on the side opposite to the first substrate. The conductive layer of the second substrate is provided on both the first substrate side and the side opposite to the first substrate.

In addition, the conductive layer provided on the opposite side of the second substrate from the first substrate may include an IT layer formed on the second substrate.
It is an O film. The conductive layer provided on the side opposite to the first substrate of the second substrate is an ITO film of a polarizing plate with an ITO film attached to the second substrate.
The second substrate, the ITO film, and the polarizing plate are arranged in this order. Further, a second substrate, a polarizing film, ITO
They are arranged in the order of the films. The conductive layer provided on the side opposite to the first substrate of the second substrate is an adhesive for attaching the second substrate and the polarizing plate. Also,
The conductive layer provided on the opposite side of the second substrate from the first substrate is an adhesive of a polarizing plate with an adhesive attached to the second substrate.

Further, the conductive layer provided on the opposite side of the second substrate from the first substrate has a sheet resistance of 10 kΩ or less. The conductive layer of the second substrate is fixed at a constant potential. The constant potential of the conductive layer of the second substrate is a ground potential.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. Hereinafter, the present invention will be described with reference to embodiments. The display characteristics of each embodiment are summarized in the table of FIG. The present invention provides conductivity to the opposing substrate, a structure having conductivity on the electrode substrate side, a structure having conductivity on the side opposite to the electrode substrate side, and a structure having conductivity on both the electrode substrate side and the opposite side. It has a structure having In each case, the afterimage in the display disappeared, and good display was obtained. As a result of our detailed study, it has been obtained that the after-image cannot be confirmed by an observer even if the surface of the liquid crystal display device is rubbed at the time of display because the opposing substrate has conductivity.
The condition is that the sheet resistance is 10 ⁶ to 10 ¹³ Ω when the opposing substrate has conductivity on the electrode substrate side, and the sheet resistance is 10 Ω when the opposing substrate has conductivity on the surface opposite to the electrode substrate side.
It is kΩ or less. Note that a favorable display can be obtained even when a structure in which the conductive layer is grounded is employed.

In the present invention, when the material used for the conductive layer is used on the electrode substrate side of the counter substrate as described above, it is essential that the sheet resistance be 10 ⁶ to 10 ¹³ Ω. Further, it is preferably 10 ⁷ to 10 ¹² Ω. When the sheet resistance is 10 ⁶ Ω or less, the electric field and the capacity between the comb-shaped electrode and the conductive layer increase. If it is 10 ¹³ Ω or more, the conductivity is low, and the diffusion of charges and the removal of charges outside the opposing substrate are not sufficiently performed, so that the afterimage cannot be reduced, and the object of the present invention is not met. As constituent layers using a conductive material, there are an alignment film, a color filter, a color filter protective layer, an ITO film, and the like. Hereinafter, each will be described in detail.

The material of the alignment film having conductivity is not particularly limited, but includes a π-conjugated polymer, a metal oxide,
A charge transfer complex or the like can be used. Examples of the π-conjugated polymer include polyacetylene, polypyrrole, polythiophene, polythienylenevinylene, polyphenylenevinylene, polyaniline, and derivatives thereof. Other than these, there is no particular limitation as long as the material shows conductivity and gives alignment to the liquid crystal material. In addition, these materials can be used in combination instead of being used alone. As a method used in combination, there is a method in which a π-conjugated polymer, a metal oxide, a charge transfer complex, and the like are mixed with a conventional alignment film polyimide. In addition, Li ⁺ , Na ⁺
And the like.

A color filter having conductivity may be prepared by mixing a polycyclic aromatic compound such as acetocene or tetracene or a phthalocyanine compound with a conventional color filter.
It can be prepared and used by mixing a π-conjugated polymer. In addition, there is no particular limitation as long as it is a material that exhibits conductivity and can exhibit hue. For the color filter protective layer having conductivity, a conductive material such as a π-conjugated polymer, a metal oxide, or a charge transfer complex, or a mixture thereof with an acrylic polymer can be used. There is no particular limitation as long as the material shows conductivity other than these. The ITO film is formed by a vacuum deposition method, a sputtering method, a spin coating method, or the like, and it is essential that the thickness is 300 ° or less. It is more preferable that the angle is 200 ° or less. The film thickness does not need to be uniform over the entire film surface. If it is more than 300 °, the electric field and the capacity between the comb-shaped electrode and the conductive layer increase, so that it cannot be used.

Further, in the present invention, when the opposing substrate has conductivity on the surface opposite to the electrode substrate side, it is essential that the sheet resistance of the conductive layer is 10 kΩ or less. Further, it is preferable that the resistance is 1 kΩ or less. Sheet resistance is 10k
If it is more than Ω, the conductivity will be low, and the diffusion of charges and the removal outside the substrate will not be sufficiently performed, and the afterimage cannot be reduced. Examples of the method having conductivity include forming an ITO film, using a polarizing plate with ITO, and using a polarizing plate with a conductive adhesive. Although the polarizing plate material of the polarizing plate with ITO is not particularly limited, there are polyvinyl alcohol films, polyvinyl butyral films, etc., which are ordinary polarizing plate base materials, and materials used in conventional liquid crystal display devices are used. Can be. The same applies to the polarizing plate of the polarizing plate with a conductive adhesive.

Further, in the present invention, when the opposing substrate has conductivity on both sides, the same one as described above can be used. The conductive layer used on the electrode substrate side needs to have a sheet resistance of 10 ⁶ Ω to 10 ¹³ Ω.
It is preferably ⁷ to 10 ¹² Ω. The conductive layer used on the surface opposite to the electrode substrate side must have a sheet resistance of 10 kΩ or less, and more preferably 1 kΩ or less. The material may be the same as that described above. Although the substrate material of the present invention is not particularly limited, a material used for a conventional liquid crystal display device such as ordinary glass or quartz can be used. The electrode material of the present invention is not particularly limited, but a metal film of Al, Cr, or the like, or a metal oxide film can be used.

Embodiment 1 FIG. 1 is a cross-sectional view showing a liquid crystal display device according to Embodiment 1 of the present invention, in which a counter substrate has a conductive layer on an electrode substrate side. FIG.
1A shows a state where electric charges are locally accumulated on the substrate surface, and FIG. 1B shows a state where electric charges are diffused over the entire substrate surface. In Embodiment 1, an alignment film is used as a conductive layer. In the figure, reference numerals 1 to 8 and 10 to 13 are the same as those of the above-mentioned conventional apparatus, and the description thereof is omitted. 1
Reference numeral 5 denotes a conductive alignment film. FIG. 2 is an overall plan view and a cross-sectional view showing the liquid crystal display device of FIG. 1, and FIG. 1B is an enlarged view of a part of the cross section.

In the liquid crystal display device constructed as described above, a voltage is applied between the pair of comb-shaped electrodes 2 arranged on the electrode substrate 1, and the voltage is generated in a direction substantially parallel to the substrate surface of the electrode substrate 1. The display is performed by changing the birefringence of the liquid crystal layer by the electric field. When charges are injected into the liquid crystal display device from the outside by static electricity or the like, a place where charges are locally accumulated on the counter substrate 5 appears as shown in FIG. Does not accumulate charge. In such a state, there is a difference in the rising angle of the liquid crystal molecules between the region where the charge is stored and the region where the charge is not stored, and the image is recognized as an afterimage. However, when the opposing substrate 5 has conductivity over substantially the entire surface of the substrate, such as the alignment film 15, the distance between the charge and the conductive layer is short, and the electric charge passes through the surface of the opposing substrate 5 via the conductive layer. As shown in FIG. 1 (b), the charge can be diffused uniformly on the surface of the counter substrate 5, and the afterimage disappears, and a good display can be obtained.

Next, a manufacturing process of the liquid crystal display device will be described. First, chromium was formed to a thickness of 1000 ° on the electrode substrate 1 by a sputtering method, and was patterned using a positive photosensitive resist to form a pair of comb electrodes 2. The electrode width of the comb electrode 2 is 5 μm, and the electrode interval is 5 μm.
μm. A polyimide (AL1034 manufactured by Nippon Synthetic Rubber Co., Ltd.) is coated on this electrode substrate 1 for 800
成膜 film thickness and firing (180 ° C, 1 hour 30 minutes)
Thus, an alignment film 3 was obtained. On the other hand, an alignment film material polyacetylene is coated on the color filter protective layer 8 on the counter substrate 5 side at 800 °.
To a thickness of The sheet resistance of this alignment film material is 4.
It was 3 × 10 ⁸ Ω. A rubbing treatment was performed on the electrode substrate 1 and the counter substrate 5. The rubbing direction of the electrode substrate 1 was set to a direction shifted from the electrode interval direction by 0 to 45 degrees, and the counter substrate 5 was set to be in an antiparallel direction to the electrode substrate 1.

Next, a ring-shaped sealant is disposed on the electrode substrate 1 using an epoxy resin-based adhesive, and heat treatment (1) is performed.
(00 ° C, 10 minutes). In addition, a spacer (manufactured by Sekisui Fine Chemical) having a particle size of 5 μm is
It was sprayed so as to be 0 grains / mm ² . The two substrates were overlapped so that the rubbing directions were antiparallel, the sealant was cured by thermocompression bonding, and a liquid crystal composition ZLI-2293 (manufactured by Merck) was injected into the gap between both substrates by a vacuum injection method. . Seal the injection port with UV curable resin,
An isotropic treatment (110 ° C., 10 minutes) was performed, and a polarizing plate (Sumitomo Chemical) was attached (not shown). The direction of sticking the polarizing plate is such that the polarizing plate on the light incident side has its absorption axis direction aligned with the alignment direction (rubbing direction) of the liquid crystal molecules, and the emitting side polarizing plate has the other polarizing plate and its absorption axis direction. Are arranged at right angles. The liquid crystal display device thus created is
An alignment film 15 having a sheet resistance of 4.3 × 10 ⁸ Ω is applied on the counter substrate 5. The production process was the same as that of the conventional liquid crystal display device, and a good display without an afterimage could be obtained.

Embodiment 2 FIG. FIG. 3 is a sectional view showing a liquid crystal display device according to Embodiment 2 of the present invention. In the figure, 1 to 6, 8 to 10 are the same as those in FIG. Reference numeral 17 denotes a conductive color filter. In the second embodiment, the insulating alignment film 9 is used as the alignment film of the counter substrate 5 in the first embodiment, and the color filter 17 is used as the conductive layer. As shown in FIG. 3, a color filter 17 having conductivity is formed on the counter substrate 5, and a color filter protective layer 8 is applied thereon. Electrode substrate 1
A comb-shaped electrode 2 similar to that of the first embodiment is patterned thereon.

Next, the manufacturing process of the liquid crystal display device will be described. First, a pair of comb electrodes 2 was formed on the electrode substrate 1 in the same manner as in the first embodiment. The electrode width of the comb electrode 2 was 5 μm, and the electrode interval was also 5 μm. On top of this, a polyimide (AL1034 made by Nippon Synthetic Rubber) was put on for 800Å
To form an alignment film 3. A color filter 17 having conductivity is provided on the counter substrate 5, and a color filter protective layer 8 is applied thereon. The color filter 17 was a mixture of a coloring material and anthracene, and had a sheet resistance of 6.4 × 10 ⁷ Ω. A polyimide AL1034 is applied to a thickness of 800 A on the counter substrate 5 to form an alignment film 9.
And A rubbing process was performed on the two substrates. The rubbing direction was the same as in the first embodiment. Next, the two substrates were overlapped so that the cell gap was 5 μm, the rubbing direction was set in the antiparallel direction, and the liquid crystal composition ZLI-2293 was injected. The inlet was sealed and a polarizing plate (not shown) was attached. The attaching direction of the polarizing plate was the same as that in the first embodiment. In the liquid crystal display device thus manufactured, the opposite substrate 5 has a sheet resistance of 6.4 × 10 ⁷ Ω.
Color filter 17. The creation process is
There was no change from the process of the conventional liquid crystal display device, and a good display with no afterimage was obtained as in the first embodiment.

Embodiment 3 FIG. FIG. 4 is a sectional view showing a liquid crystal display device according to Embodiment 3 of the present invention. In the third embodiment, the insulating alignment film 9 is used as the alignment film of the counter substrate 5 in the first embodiment, and the color filter protective layer 18 is used as the conductive layer. As shown in FIG. 4, a color filter protective layer 18 having conductivity is applied on the color filter 7 on the counter substrate 5. On the electrode substrate 1, a comb electrode 2 similar to that of the first embodiment is patterned.

Next, the manufacturing process of the liquid crystal display device will be described. First, a pair of comb electrodes 2 was formed on the electrode substrate 1 in the same manner as in the first embodiment. The electrode width of the comb electrode 2 was 5 μm, and the electrode interval was also 5 μm. On top of this, polyimide (AL1034 made by Nippon Synthetic Rubber) was put on for 800
An alignment film 3 was formed by forming a film having a thickness of Å. The counter substrate 5 has a color filter protective layer 18 exhibiting conductivity. The color filter protective layer 18 was a mixture of acrylic and polypyrrole, and had a sheet resistance of 8.2 × 10 ¹¹ Ω. Polyimide (AL10 made by Nippon Synthetic Rubber Co., Ltd.)
34) was formed to a thickness of 800 ° to form an alignment film 9. A rubbing process was performed on the two substrates. The rubbing direction was the same as in the first embodiment. Next, the two substrates were overlapped so that the cell gap was 5 μm, the rubbing direction was set to be in the antiparallel direction, and the liquid crystal composition ZLI-22 was formed.
93 were injected. The inlet was sealed and a polarizing plate (not shown) was attached. The attaching direction of the polarizing plate was the same as that in the first embodiment. In the liquid crystal display device thus manufactured, the sheet resistance of the color filter protective layer 18 is 8.2 × 10 ^11.
Ω. The production process was the same as that of the conventional liquid crystal display device, and a good display with no afterimage was obtained as in the first embodiment.

Embodiment 4 FIG. 5 is a sectional view showing a liquid crystal display device according to Embodiment 4 of the present invention. In the fourth embodiment, an insulating alignment film 9 is used as the alignment film of the counter substrate 5 in the first embodiment, and an IT
An O film 19 is formed on the color filter 7. As shown in FIG. 5, the counter substrate 5 has an IT
An O film 19 is applied. Embodiment 1 has an electrode substrate 1
The comb-shaped electrode 2 similar to the above is patterned.

Next, a manufacturing process of the liquid crystal display device will be described. First, a pair of comb electrodes 2 was formed on the electrode substrate 1 in the same manner as in the first embodiment. The electrode width of the comb electrode 2 was 5 μm, and the electrode interval was also 5 μm. On top of this, polyimide (AL1034 made by Nippon Synthetic Rubber) was put on for 800
A film was formed to have a thickness of Å to form an alignment film 3. Next, I was formed on the color filter 7 on the counter substrate 5 by sputtering.
A TO film 19 was formed to a thickness of 100 to 150 °. The sheet resistance of this ITO film 19 was 2.5 × 10 ⁷ Ω. On top of this, polyimide (AL103 made by Nippon Synthetic Rubber)
4) was formed to a thickness of 800 ° to form an alignment film 9. A rubbing process was performed on the two substrates. The rubbing direction is
The direction was the same as in the first embodiment. Next, the two substrates were overlapped so that the cell gap was 5 μm, the rubbing direction was set to be in the antiparallel direction, and the liquid crystal composition ZLI-2 was formed.
293 was injected. The inlet was sealed and a polarizing plate (not shown) was attached. The attaching direction of the polarizing plate was the same as that in the first embodiment. The liquid crystal display device thus prepared has a sheet resistance of 2.5 × 10
^It has an ITO film 19 of ⁷ Ω. The production process was the same as that of the conventional liquid crystal display device, and a good display with no afterimage was obtained as in the first embodiment.

Embodiment 5 FIG. 6 is a sectional view showing a liquid crystal display device according to Embodiment 5 of the present invention. In the fifth embodiment, an insulating alignment film 9 is used as the alignment film of the counter substrate 5 in the first embodiment, and an IT
The O film 19 is formed outside the counter substrate 5. On the electrode substrate 1, a comb electrode 2 similar to that of the first embodiment is patterned.

Next, the manufacturing process of this liquid crystal display device will be described. First, a pair of comb electrodes 2 was formed on the electrode substrate 1 in the same manner as in the first embodiment. The electrode width of the comb electrode 2 was 5 μm, and the electrode interval was also 5 μm. On top of this, polyimide (AL1034 made by Nippon Synthetic Rubber Co.)
To form an alignment film 3. The counter substrate 5 has an ITO film 19 on a surface opposite to the color filter 7 surface. The sheet resistance of the ITO film 19 was 3.7 kΩ. A polyimide (A made by Nippon Synthetic Rubber Co., Ltd.)
L1034) was formed to a thickness of 800 ° to form an alignment film 9. The rubbing direction was the same as in the first embodiment. Next, the two substrates were overlapped so that the cell gap was 5 μm, the rubbing direction was set in the antiparallel direction, and the liquid crystal composition ZLI-2293 was injected. The inlet was sealed and a polarizing plate (not shown) was attached. The attaching direction of the polarizing plate was the same as that in the first embodiment.

In the liquid crystal display device thus manufactured, an ITO film 19 having a sheet resistance of 3.7 kΩ is provided on the outside of the counter substrate 5.
have. The production process was the same as that of the conventional liquid crystal display device, and a good display with no afterimage was obtained as in the first embodiment.

Embodiment 6 FIG. FIG. 7 is a sectional view showing a liquid crystal display device according to Embodiment 6 of the present invention. In the sixth embodiment, the insulating substrate 9 is used as the alignment film of the counter substrate 5 in the first embodiment, and the polarizing plate 20 with the ITO film 19 is attached to the counter substrate 5 so that the counter substrate 5 can be formed. It has conductivity. The way of attachment is such that it has the structure of counter substrate 5 / polarizing plate 20 / ITO film 19. The opposite substrate 5 is the same substrate as in the fifth embodiment, and the electrode substrate 1
A comb-shaped electrode 2 similar to that of the first embodiment is patterned thereon.

Next, a manufacturing process of the liquid crystal display device will be described. The electrode substrate 1 was made in the same manner as in the fifth embodiment. The counter substrate 5 has the same configuration as that of the fifth embodiment. The alignment film 9 is made of polyimide (AL103 made by Nippon Synthetic Rubber).
4) was used. The rubbing direction was the same as in the fifth embodiment. The two substrates were bonded together such that the cell gap was 5 μm and the liquid crystal alignment direction was antiparallel, and the liquid crystal composition ZLI-2293 was injected to prepare a liquid crystal display device. As the polarizing plate, a polarizing plate with ITO (manufactured by Sumitomo Chemical) 20 was used on the counter substrate 5 side, and the same polarizing plate (not shown) as in Embodiment 1 was used on the electrode substrate 1 side. The sheet resistance of the ITO film 19 of the polarizing plate 20 was 300Ω.
The method of attaching the polarizing plate with the ITO film was such that the structure of the counter substrate 5 / the polarizing plate 20 / the ITO film 19 was adopted. The attaching direction of the polarizing plate was the same as that in the first embodiment. The liquid crystal display device thus manufactured uses a polarizing plate 20 with ITO as a polarizing plate on the counter substrate 5 side, and an ITO film 19.
Has a sheet resistance of 300Ω. The manufacturing process is the same as that of the conventional liquid crystal display device,
As in the case of the above, a good display without an afterimage could be obtained.

Embodiment 7 FIG. FIG. 8 is a sectional view showing a liquid crystal display device according to Embodiment 7 of the present invention. In the seventh embodiment, as in the sixth embodiment, the ITO film 1
By sticking the polarizing plate 20 with 9 to the opposing substrate 5, the opposing substrate 5 has conductivity. The method of attachment is such that it has the structure of the counter substrate 5 / ITO film 19 / polarizing plate 20. The counter substrate 5 is the same as in the fifth embodiment.
On the electrode substrate 1, a comb electrode 2 similar to that of the first embodiment is patterned.

Next, the manufacturing process of this liquid crystal display device will be described. The electrode substrate 1 was made in the same manner as in the fifth embodiment. The counter substrate 5 has the same configuration as that of the fifth embodiment.
Alignment film 9 is polyimide (AL1034 made by Japan Synthetic Rubber)
Was used. The rubbing direction was the same as in the fifth embodiment.
The two substrates were bonded together such that the cell gap was 5 μm and the liquid crystal alignment direction was antiparallel, and the liquid crystal composition ZLI-2293 was injected to prepare a liquid crystal display device. As the polarizing plate, a polarizing plate with an ITO film 19 (manufactured by Sumitomo Chemical) 20 was used on the counter substrate 5 side, and the same polarizing plate (not shown) as in the first embodiment was used on the electrode substrate 1 side. The sheet resistance of the ITO film 19 of the polarizing plate 20 was 300Ω. The method of attaching the polarizing plate 20 with ITO is as follows.
/ ITO film 19 / polarizing plate 20.
The attaching direction of the polarizing plate was the same as that in the first embodiment. The liquid crystal display device thus manufactured uses a polarizing plate 20 with an ITO film 19 as a polarizing plate on the counter substrate 5 side, and the sheet resistance of the ITO film 19 is 300Ω. The production process was the same as that of the conventional liquid crystal display device, and a good display with no afterimage was obtained as in the first embodiment.

Embodiment 8 FIG. FIG. 9 is a sectional view showing a liquid crystal display device according to Embodiment 8 of the present invention. In Embodiment 8, the opposing substrate 5 has conductivity by attaching the polarizing plate 22 with the conductive adhesive 21 to the opposing substrate 5. The opposite substrate 5 is the same substrate as in the fifth embodiment. On the electrode substrate 1, a comb electrode 2 similar to that of the first embodiment is patterned.

Next, the manufacturing process of this liquid crystal display device will be described. The electrode substrate 1 was made in the same manner as in the fifth embodiment. The counter substrate 5 has the same configuration as that of the fifth embodiment. The alignment film 9 is made of polyimide (AL103 made by Nippon Synthetic Rubber).
4) was used. The rubbing direction was the same as in the fifth embodiment. The two substrates were bonded together such that the cell gap was 5 μm and the liquid crystal alignment direction was antiparallel, and the liquid crystal composition ZLI-2293 was injected to prepare a liquid crystal display device. As the polarizing plate, a polarizing plate 22 with a conductive adhesive 21 was used on the opposing substrate 5 side, and the same polarizing plate (not shown) as in Embodiment 1 was used on the electrode substrate 1 side. The sheet resistance of the pressure-sensitive adhesive 21 was 6.1 kΩ. The attaching direction of the polarizing plate was the same as that in the first embodiment. The liquid crystal display device thus manufactured uses a polarizing plate 22 with a conductive adhesive 21 as a polarizing plate on the counter substrate 5 side, and the adhesive 21 has a sheet resistance of 6.1 kΩ. The production process was the same as that of the conventional liquid crystal display device, and a good display with no afterimage was obtained as in the first embodiment.

Embodiment 9 FIG. 10 is a sectional view showing a liquid crystal display device according to Embodiment 9 of the present invention. In the ninth embodiment, the material of the alignment film 15 is used as the conductive layer, and the ITO film 19 is formed outside the counter substrate 5. On the electrode substrate 1, a comb electrode 2 similar to that of the first embodiment is patterned.

Next, the manufacturing process of this liquid crystal display device will be described. First, a pair of comb electrodes 2 was formed on the electrode substrate 1 in the same manner as in the first embodiment. The electrode width of the comb electrode 2 was 5 μm, and the electrode interval was also 5 μm. A polyimide (AL1034 manufactured by Japan Synthetic Rubber) was formed thereon to a thickness of 800 ° to form an alignment film 3. The opposite substrate 5 has an ITO film 19 on the surface opposite to the color filter 7. The sheet resistance of the ITO film 19 was 900Ω. A film of polyphenylenevinylene was formed to a thickness of 800 ° on the counter substrate 5 to form an alignment film 15. The sheet resistance of the alignment film 15 was 3.5 × 10 ¹² Ω. A rubbing process was performed on the two substrates. The rubbing direction is the same as in the first embodiment.
In the same direction as. Next, the two substrates were overlapped so that the cell gap was 5 μm, the rubbing direction was set in the antiparallel direction, and the liquid crystal composition ZLI-2293 was injected. The inlet was sealed and a polarizing plate (not shown) was attached.
The attaching direction of the polarizing plate was the same as that in the first embodiment. In the liquid crystal display device thus prepared, the opposing substrate 5 has an alignment film 1 having a sheet resistance of 3.5 × 10 ¹² Ω on the electrode substrate 1 side.
5 and a sheet resistance 900 outside the counter substrate 5.
Ω ITO film 19 is provided. The manufacturing process is the same as that of the conventional liquid crystal display device,
As in the case of the above, a good display without an afterimage could be obtained.

Embodiment 10 FIG. FIG. 11 is a sectional view showing a liquid crystal display device according to Embodiment 10 of the present invention. In the tenth embodiment, the color filter 17 is used as the conductive layer, and the polarizing plate 20 with the ITO film 19 is attached to the counter substrate 5 so that the counter substrate 5 has conductivity. On the electrode substrate 1, a comb electrode 2 similar to that of the first embodiment is patterned.

Next, the manufacturing process of this liquid crystal display device will be described. The comb electrode substrate 1 was produced in the same manner as in the fifth embodiment. The opposing substrate 5 is a color filter 1 showing conductivity.
7 on which a color filter protective layer 8 is applied. The color filter 17 was a mixture of a coloring material and tetracene, and had a sheet resistance of 2.3 × 10 ⁹ Ω. Polyimide AL1034 was applied to the counter substrate 5 to a thickness of 800 ° to form an alignment film 9. A rubbing process was performed on the two substrates. The rubbing direction was the same as in the first embodiment. Next, the two substrates were overlapped so that the cell gap was 5 μm, the rubbing direction was set in the antiparallel direction, the liquid crystal composition ZLI-2293 was injected, and the injection port was sealed. As the polarizing plate, a polarizing plate with an ITO film 19 (manufactured by Sumitomo Chemical) 20 was used on the counter substrate 5 side, and the same polarizing plate (not shown) as in the first embodiment was used on the electrode substrate 1 side. The sheet resistance of the ITO film 19 of the polarizing plate 20 is 30
It was 0Ω. The method of attaching the polarizing plate 20 with the ITO film 19 was such that it had a configuration of the counter substrate 5 / the polarizing plate 20 / the ITO film 19. The attaching direction of the polarizing plate was the same as that in the first embodiment.

In the liquid crystal display device thus manufactured, the opposing substrate 5 has a color filter 17 with a sheet resistance of 2.3 × 10 ⁹ Ω on the electrode substrate 1 side, and further has a sheet resistance of 300 Ω on the outside of the opposing substrate 5. It has a polarizing plate 20 with an ITO film 19. The production process was the same as that of the conventional liquid crystal display device, and a good display with no afterimage was obtained as in the first embodiment.

[0044]

Since the present invention is configured as described above, it has the following effects. A first substrate on which an electrode for controlling a display pixel is formed, and a color filter disposed opposite to the first substrate, having a conductive layer over substantially the entire display surface, and being colored corresponding to the display surface. Comprising a liquid crystal layer sandwiched between a second substrate having
Since the conductive layer is provided on almost the entire display surface of the second substrate,
It is possible to prevent local accumulation of charges that cause an afterimage, rapidly diffuse the charges, and obtain a good display without an afterimage.

Further, since the second substrate is provided with the conductive layer on the first substrate side, the accumulation of electric charges on the opposite substrate is prevented, so that a good display without an afterimage can be obtained. Furthermore, since a conductive layer having a sheet resistance of 10 ⁶ to 10 ¹³ Ω is provided on the first substrate side of the second substrate, local accumulation of charges that cause an afterimage is prevented, and charges are reduced. Can spread rapidly.

Further, since the second substrate is provided with a conductive layer on the side opposite to the first substrate, local accumulation of electric charges causing afterimages is prevented, and the electric charges are diffused more reliably. ,
Good display without afterimages can be obtained. In addition, since the conductive layer is provided on both the first substrate side of the second substrate and the opposite side to the first substrate, local accumulation of charges causing afterimages is prevented, and diffusion of charges is prevented. It is possible to promote the display more reliably and obtain a good display without an afterimage.

Furthermore, since a conductive layer having a sheet resistance of 10 kΩ or less is provided on the second substrate on the side opposite to the first substrate, local accumulation of charges causing afterimages is prevented, and the charges are reduced. It can be more reliably diffused.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a liquid crystal display device having a structure having a conductive material inside a counter substrate according to a first embodiment of the present invention.

2 is an overall plan view showing the liquid crystal display device of FIG. 1 and FIG.
It is -A 'sectional drawing.

FIG. 3 is a sectional view showing a liquid crystal display device according to a second embodiment of the present invention.

FIG. 4 is a sectional view showing a liquid crystal display device according to a third embodiment of the present invention.

FIG. 5 is a sectional view showing a liquid crystal display device according to a fourth embodiment of the present invention.

FIG. 6 is a sectional view showing a liquid crystal display device according to a fifth embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a liquid crystal display device having a structure having a conductive material outside a counter substrate according to a sixth embodiment of the present invention.

FIG. 8 is a sectional view showing a liquid crystal display device according to a seventh embodiment of the present invention.

FIG. 9 is a sectional view showing a liquid crystal display device according to an eighth embodiment of the present invention.

FIG. 10 is a cross-sectional view showing a liquid crystal display device having a structure having a conductive material according to a ninth embodiment of the present invention on both surfaces of a counter substrate.

FIG. 11 is a sectional view showing a liquid crystal display device according to a tenth embodiment of the present invention.

FIG. 12 is a cross-sectional view showing a conventional in-plane response type liquid crystal display device having no conductive material.

FIG. 13 is a pattern diagram of a comb electrode.

FIG. 14 is a table showing key points and display characteristics of each embodiment of the present invention.

[Description of Signs] 1 electrode substrate, 2 comb electrodes, 3, 9, 15 alignment film, 5 opposing substrate, 7, 17 color filter, 8, 1
8 Color filter protective layer, 10 liquid crystal layer, 19 IT
O film, 20, 22 polarizing plate, 21 adhesive.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masaya Mizunuma 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Akira Tamaya 2-3-2 Marunouchi, Chiyoda-ku, Tokyo (72) Inventor Yasuhiro Morii 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Sanishi Electric Co., Ltd.

Claims (18)

[Claims] 1. A first substrate on which an electrode for generating an electric field is formed. The first substrate is disposed to face the first substrate. The first substrate has a conductive layer over substantially the entire display surface and is colored corresponding to the display surface. A liquid crystal display device comprising: a second substrate having a color filter; and a liquid crystal layer sandwiched between the first substrate and the second substrate. 2. The liquid crystal display device according to claim 1, wherein the conductive layer of the second substrate is provided on the first substrate side. 3. The liquid crystal display device according to claim 2, wherein the conductive layer provided on the first substrate side of the second substrate also serves as a color filter. 4. The liquid crystal display device according to claim 2, wherein the conductive layer provided on the first substrate side of the second substrate is a protective layer formed on a color filter. 5. The liquid crystal according to claim 2, wherein the conductive layer provided on the first substrate side of the second substrate is an alignment film formed on the color filter via a protective layer. Display device. 6. The liquid crystal display device according to claim 2, wherein the conductive layer provided on the first substrate side of the second substrate is an ITO film formed on a color filter. 7. The conductive layer provided on the first substrate side of the second substrate has a sheet resistance of 10 ⁶ to 10 ¹³ Ω. The liquid crystal display device according to the item. 8. The liquid crystal display device according to claim 1, wherein the conductive layer of the second substrate is provided on a side opposite to the first substrate. 9. The method according to claim 1, wherein the conductive layer of the second substrate is provided on both the first substrate and the side opposite to the first substrate. The liquid crystal display device according to the item. 10. The conductive layer provided on the opposite side of the second substrate from the first substrate is an ITO film formed on the second substrate. The liquid crystal display device as described in the above. 11. The conductive layer provided on the opposite side of the second substrate from the first substrate is an ITO film of a polarizing plate with an ITO film attached to the second substrate.
Alternatively, the liquid crystal display device according to claim 9. 12. The liquid crystal display device according to claim 11, wherein a second substrate, an ITO film, and a polarizing plate are arranged in this order. 13. The liquid crystal display device according to claim 11, wherein a second substrate, a polarizing film, and an ITO film are arranged in this order. 14. The conductive layer provided on the opposite side of the second substrate from the first substrate is an adhesive for adhering the second substrate and the polarizing plate. 10. The liquid crystal display device according to item 9. 15. The conductive layer provided on the side opposite to the first substrate of the second substrate is an adhesive of an adhesive-attached polarizing plate attached to the second substrate. The liquid crystal display device according to claim 8 or 9. 16. The liquid crystal according to claim 8, wherein the conductive layer provided on the opposite side of the second substrate from the first substrate has a sheet resistance of 10 kΩ or less. Display device. 17. The liquid crystal display device according to claim 1, wherein the conductive layer of the second substrate is fixed at a constant potential. 18. The liquid crystal display device according to claim 17, wherein the constant potential of the conductive layer of the second substrate is a ground potential.