JPH09211469A - Spacer for liquid crystal display device and its production and liquid crystal display device provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the spacer by which stable quality of display picture image can be secured under service circumstances varying over a wide range with a small amount of the dispersed spacer and also to provide the production of the spacer and a liquid crystal display device that is provided with the spacer and capable of maintaining stable quality of display picture image. SOLUTION: This elastic spacer has a 1 to 100μm average particle size in its total particle size distribution, wherein the standard deviation in the particle size distribution of particles having particle size smaller than the particle size mode in the total particle size distribution is less than that of particles having particle size larger than this particle size mode. This liquid crystal device is manufactured by dispersing the spacer in a liquid crystal panel and the cell gap size is equal to or smaller than the particle size mode of the spacer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spacer for a liquid crystal display device capable of obtaining a stable display image, a manufacturing method thereof, and a liquid crystal display device using the spacer for a liquid crystal display device.

[0002]

2. Description of the Related Art As shown in FIG. 1, a spacer for a liquid crystal display element is used to form a constant gap between two transparent substrates which form a liquid crystal display panel. Such a spacer for a liquid crystal display device, in the manufacturing process, so that the desired particle size becomes the average particle size,
Those distributed within a certain reasonable range are manufactured. Japanese Examined Patent Publication No. 6-17373 discloses that in a hydrophilic organic liquid,
A method for producing fine particles having a narrow particle size distribution by polymerizing a vinyl monomer in the presence of a polymer dispersant is disclosed.

However, as described above, even fine particles produced so as to have a desired particle size in the polymerization stage include particles having too small or too large particle diameter, and the liquid crystal display device as it is. Since the image quality of the liquid crystal display element may be deteriorated when used as a spacer for liquid crystal display, the spacer for liquid crystal display element is usually classified based on the particle size.

The particle size distribution of the spacer for a liquid crystal display device produced in this manner is generally represented by a normal distribution regardless of the type of polymerization method and classification method. Therefore, in such a spacer for a liquid crystal display element, both fine particles larger than the average particle diameter and fine particles smaller than the average particle diameter are present in substantially the same amount.

Since the surface of the substrate of the liquid crystal display element is not perfectly smooth and has slight irregularities, even if the spacer for the liquid crystal display element has a variation in particle diameter,
To some extent acceptable. However, if the particles are too small,
Since it has almost no involvement in the gap formation, it does not affect the gap formation, but the amount of dispersion in the substrate becomes larger than necessary. Further, since the spacers for the liquid crystal display element are originally foreign matters in the liquid crystal, there are problems that the image quality of the liquid crystal display element may be deteriorated due to the presence of many that are not involved in the gap formation. .

Recently, a method of increasing the accuracy of the cell gap by reducing the standard deviation in the particle size distribution of the spacer is generally used. But,
If the standard deviation is too small, the cell gap may increase due to the volume expansion of the liquid crystal when the liquid crystal display element is exposed to high temperature.If the cell gap becomes larger than the particle size of the spacer, the liquid crystal display The element spacer cannot function as a gap material. In addition, when the liquid crystal display element is used for a long time, there is a problem that the spacer is likely to move due to an increase in environmental temperature.

Therefore, in order to stabilize the cell gap in a wide temperature range, it is preferable that the spacer for liquid crystal display element has a certain variation in particle diameter.
In order to reduce wasteful fine particles, it is preferable to have a uniform particle diameter.

[0008]

In view of the above, the present invention provides a spacer for a liquid crystal display device capable of ensuring a stable display image quality in a wide use environment with a small amount of dispersion, and a manufacturing method thereof. An object of the present invention is to provide a liquid crystal display device capable of maintaining stable display image quality.

[0009]

The present invention is a spacer for a liquid crystal display device having elasticity, wherein the average particle size in the particle size distribution of the spacer for a liquid crystal display device is 1 to 1.
The liquid crystal display has a diameter of 00 μm and a standard deviation in the particle size distribution on the side smaller than the mode particle size is smaller than the standard deviation in the particle size distribution on the side larger than the mode particle size. It is an element spacer. Hereinafter, the present invention will be described in detail.

The spacer for a liquid crystal display element of the present invention has elasticity. By having elasticity, the movement of the spacer can be prevented when the cell gap of the liquid crystal display element is set to be equal to or less than the average particle diameter of the spacer for the liquid crystal display element.

The spacer for liquid crystal display element of the present invention has an average particle size of 1 to 100 μm in the particle size distribution. If it is less than 1 μm, it easily aggregates, and if it exceeds 100 μm, it is rarely used. Therefore, it is limited to the above range.

In the spacer for liquid crystal display device of the present invention, the standard deviation in the particle size distribution on the side where the standard deviation in the particle size distribution on the side smaller than the mode particle size is larger than the mode particle size on the side smaller than the mode particle size. It is smaller than the deviation. The particle size distribution of the liquid crystal display element spacer of the present invention is
In FIG. 2, as indicated by the solid circle, the particle size distribution on the side smaller than the mode particle size is sharper than the particle size distribution on the side larger than the mode particle size. That is,
When the standard deviation in the particle size distribution on the side smaller than the mode particle size is σ ′ and the standard deviation in the particle size distribution on the side larger than the mode particle size is σ, σ ′ <σ
It is expressed as

Here, the standard deviation σ representing the particle size distribution on the side larger than the mode particle size is an important factor that determines the working conditions for assembling the liquid crystal display element as in the case of the conventional spacers. It is preferably the same as the usual standard deviation of a spacer for a liquid crystal display element having elasticity, and preferably 3 to 6% of the average particle diameter. If it ’s too small,
If the spacer cannot cope with the expansion of the cell gap when the temperature environment changes and it is too large, the normal display of the liquid crystal display element is hindered due to the occurrence of scratches on the inner surface of the substrate due to the particles with the maximum particle size represented by 3σ. May occur.

In the present invention, even if the statistically processed standard deviation is appropriate, if the normality is greatly lost in the actual particle size distribution, spacers (generally 50 to 300) dispersed in the liquid crystal display device are obtained. The relationship between the load applied to the whole piece / mm ² ) and the compressive deformation becomes irregular, and it becomes difficult to stably form and maintain the cell gap.

When the difference between σ ′ and σ becomes small,
There is no big difference compared with the conventional spacer, and the effect of the present invention cannot be exhibited. The lower limit of σ'is determined by the standard deviation of the fine particle groups classified into the average particle diameters smaller than the mode particle diameters as described below. Practically smaller is preferable. The average particle size and the compounding amount of the fine particle group classified into the average particle size smaller than the mode particle size are determined so as to satisfy the above conditions.

The spacer for a liquid crystal display element of the present invention has a specific particle size distribution of the spacer for a liquid crystal display element by blending two or more kinds of fine particle groups classified based on the size of the particle diameter. A method of manufacturing a spacer for a liquid crystal display device having elasticity as described above, wherein the average particle size of the particle size distribution is 1 to 100 μm, and the average particle size is smaller than the mode particle size. The standard deviation in the particle size distribution of the fine particle group (hereinafter referred to as "small particles") is larger than the standard deviation of the fine particle group (hereinafter referred to as "large particles") classified into an average particle size larger than the above mode particle size. It can be obtained by a method for producing a spacer for a liquid crystal display device, which is small and has a weight ratio of the compounding amount of the small particles to the compounding amount of the large particles of 3: 7 to 7: 3.

In the present specification, the "fine particle group" means an aggregate of fine particles having one normal distribution. The particle size distribution characteristic of the spacer for a liquid crystal display element of the present invention can be theoretically predicted by adding a plurality of normal distribution functions,
The manufactured spacer does not show a normal distribution, the average particle diameter and the mode particle diameter do not match, and the distribution has a distortion.
Suitable as a spacer for a liquid crystal display device from a fine particle mixture that forms a particle size distribution between the particles having the largest particle size and the particles having the smallest particle size in the two types of particle groups to be blended. Selection conditions are determined.

In the particle size distribution of the spacer for a liquid crystal display device of the present invention, the average particle size and the mode particle size are between the average particle sizes of two or more kinds of fine particle groups to be mixed, and the mode The value particle size does not become larger than the average particle size.

To obtain the spacer for a liquid crystal display device of the present invention, the average particle size of the small particles is D _S and the standard deviation is σ.
_S , where the average particle size of the large particles is D _L and the standard deviation is σ _L, between the compounding amount W _{S of the} small particles and the compounding amount W _L of the large particles, 3/7 ≦ W _S / W _L ≦ 7/3 (weight ratio) σ ′ <σ _S <σ _L <σ σ _S / σ _L ≦ 0.7 is preferable. More _{preferably, 4/6 ≦ W S /} W L ≦ 6/4 σ '<σ S <σ L <σ σ S / σ L ≦ 0.7 0.5σ L ≦ D L -D S ≦ 1.25σ It is _L.

When σ _S / σ _L is larger than 0.7, the difference between σ and σ'is small, and the effect of the present invention is small. Also, the above σ _S / σ _L ≦ 0.7
Even, the D _L -D _S is becomes smaller than 0.5Shiguma _L, the small particles are absorbed into the particle size distribution of the large particles, the difference between the sigma and the sigma 'is reduced.

When the above D _L -D _S exceeds 1.25σ _L , the relationship between the above σ and the above σ'is appropriate, but on the side larger than the above mode particle size of the spacer obtained by blending. The particle size distribution has two peaks, which is not preferable as a spacer for a liquid crystal display device. The ratio of W _S to W _L is preferably centered on the equivalent, and the effect of the present invention is reduced if one is too large or too small.

In the method for producing a spacer for a liquid crystal display device of the present invention, it is more preferable that at least one of the above two kinds of fine particle groups is a mixture of fine particle groups having a similar particle size distribution. A diameter distribution can be obtained. In this case, fine particle groups having similar particle size distribution characteristics such as average particle diameter and standard deviation are mixed to prepare in advance two kinds of fine particle groups having different particle size distribution characteristics such as average particle diameter and standard deviation. . The above-mentioned D _L and the above-mentioned D _S and the above-mentioned σ _L and the above-mentioned σ _S are determined by the characteristic values of these two kinds of fine particle groups.

The method for manufacturing a spacer for a liquid crystal display device of the present invention measures the particle size distribution of a plurality of fine particle groups having different particle size distribution characteristics, and predicts the particle size distribution after addition by adding respective normal distribution functions. However, it is also possible to estimate the blending amount of each fine particle and simultaneously uniformly mix a plurality of fine particles.

In order to obtain a spacer for a liquid crystal display device having a predetermined mode particle size, two types of fine particle groups to be blended are determined based on the mode particle size, and their average particle size and standard deviation are determined. The normal distribution function based on is added, the particle size distribution after the addition is predicted, and the difference between the mode value particle size and the target mode value particle size by prediction is calculated, and the average particle size of the two fine particles to be blended and the standard Finalize the deviation.

The fine particles used in the present invention are not particularly limited as long as they satisfy the above-mentioned conditions.
Examples thereof include polymer polymer particles produced by general suspension polymerization, seed polymerization, and other methods for producing monodisperse particles. The particle size distribution of the spacer for a liquid crystal display device of the present invention can be measured with a Coulter counter ZB / C-1000 or the like.

Since the spacer for a liquid crystal display element and the method for manufacturing the same according to the present invention are as described above, the spacer is dispersed and dispersed on the substrate to make the cell gap of the liquid crystal display element the most frequent in the particle size distribution of the spacer. When the value is kept below the particle diameter, the standard deviation σ is the same as the standard deviation σ and σ ′ in the particle size distribution on both the large particle side and the small particle side. It is possible to reduce the amount of the display element spacers applied to the substrate and improve the quality of the liquid crystal display element.

A second aspect of the present invention is a liquid crystal display element, wherein the liquid crystal display element spacer of the present invention is dispersed in a liquid crystal panel, and the cell gap is not more than the mode particle size of the liquid crystal display element spacer. . Examples of the liquid crystal display element of the present invention 2 include those shown in FIG. 1 and the like, and are produced as follows, for example.

First, an insulating film (eg, SiO ₂ ) is formed on each of the opposing surfaces of a pair of transparent glass substrates 1, and a transparent electrode 2 (eg, I ₂ ) is formed on the insulating film of each substrate.
(TO) is patterned by photolithography. An alignment film 3 (for example, a polyimide film) is formed on the transparent electrode 2 of each of the above substrates. Next, spacers A for liquid crystal display elements are scattered on the alignment film 3 on the substrate.

After that, an adhesive layer is formed on the periphery of the substrate facing the above substrate by using a sealing material 5, the adhesive layer is bonded to the substrate on which the spacers are dispersed, and the liquid crystal 8 is injected between these substrates. By doing so, a liquid crystal cell is formed. By providing wiring in the liquid crystal cell, the liquid crystal display element 9 can be formed.
Get.

[0030]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

Example 1 Production of high-molecular polymer particles Tetramethylolmethane tetraacrylate (NH ester A-TMMT, manufactured by Shin-Nakamura Chemical Co., Ltd.) as a monomer
320 g, divinylbenzene 192 g, ethylvinylbenzene 128 g, and benzoyl peroxide 18 g as a polymerization initiator were mixed and uniformly dissolved. Into a separable flask having a volume of 5 L, 2400 ml of a 5% aqueous solution of polyvinyl alcohol was placed, and the mixture was further injected,
It was atomized while stirring. After about 8 hours, the stirring was stopped when the average particle size of the liquid droplets reached 9 μm. Then, while injecting nitrogen gas into the vessel, the mixture was gently stirred in a hot water bath at 80 ° C. to carry out a polymerization reaction. The reaction was stopped after 10 hours.

The reaction product was separated from the aqueous polyvinyl alcohol solution by filtration through a glass filter. The reaction product was thoroughly washed on a glass filter with hot water at 80 ° C to obtain fine polymer particles. The high molecular weight polymer fine particles were classified, and after classification were appropriately re-mixed so as to have a desired average particle size, to obtain two high molecular weight polymer fine particle groups having a particle size distribution shown in Table 1.

Preparation of Spacer for Liquid Crystal Display Device The composition shown in Table 1 was performed to obtain a spacer for liquid crystal display device.

[0034]

[Table 1]

FIG. 3 shows the particle size distribution curve. FIG.
In the figure, the solid line with a circle indicates the particle size distribution of the spacer for liquid crystal display device of Example 1 by Coulter Counter ZB / C-1000.
It is a particle size distribution curve measured in. The □ -dotted line is a normal distribution curve theoretically calculated and plotted using the average particle diameter and standard deviation obtained from the measured particle diameter distribution of the spacer. ● The dotted line is a normal distribution curve theoretically obtained by transferring the particle size distribution curve of the larger side to the smaller side, with the mode particle size in the particle size distribution curve of the spacer prepared by the above formulation as the axis . The small side standard deviation in Table 1 is also obtained by similarly transferring the particle size distribution on the opposite side with the mode particle size as the axis.

As is apparent from FIG. 3, the standard deviation in the particle size distribution on the side smaller than the mode particle size is smaller than the standard deviation in the particle size distribution on the side larger than the mode particle size. It should be noted that ΔD is the difference between the average particle diameters of the two types of fine particles used in the blending. σ> σ _L , σ ′> σ
The standard deviation in the particle size distribution after _S and _S was slightly increased on both the small side and the large side, but it was in a range practically usable as a spacer for liquid crystal display devices.

Example 2 The polymer fine particles of Example 1 were used to classify them, and after classifying, remixing them appropriately so as to obtain a desired average particle size, and as shown in Table 2, Three groups of high molecular weight polymer particles were used. These had relatively small standard deviations, but had slightly different average particle sizes. A spacer for a liquid crystal display device was obtained by blending these three fine particle groups.

[0038]

[Table 2]

Table 3 shows the formulation prediction by computer simulation.

[0040]

[Table 3]

In Table 3, large particles (1 + 2) and small particles (3)
The difference in particle size between and was ΔD = 1.03σ. The particle size distribution of the obtained spacer for liquid crystal display device is shown in FIG.
Compared to FIG. 3 of Example 1, the larger side also shows a sharp particle size distribution, and in this case as well, the standard deviation between the large side and the small side was a large difference of σ ′ / σ = 0.53. .

Comparative Example 1 Using the polymer fine particles of Example 1, the mode particle size of the spacer for liquid crystal display device prepared in Example 1 was taken as the average particle size, and the standard in the particle size distribution on the large side was used. Two fine particle groups having the standard deviation as the deviation were prepared with the composition shown in Table 4 to obtain a spacer for a liquid crystal display device. This is a method for adjusting the particle size of a fine particle product that has been conventionally used. By mixing two fine particle groups having almost the same average particle size and particle size distribution and mixing them uniformly, it is possible to obtain almost the same average particle size. A spacer for a liquid crystal display device having a particle size and a particle size distribution could be obtained.

[0043]

[Table 4]

By mixing fine particles having the same average particle diameter and having a normal distribution, fine particles having a normal distribution both practically and theoretically can be obtained. As shown in FIG. 5, the obtained spacer for liquid crystal display device has a mode particle size and an average particle size that are practically the same, and the particle size distribution does not change between the large side and the small side. The particle size distribution was symmetrical with respect to the axis.

Comparative Example 2 By using the polymer fine particles of Example 1, the difference in average particle diameter between the two fine particle groups to be blended was made smaller than in Example 1 (ΔD =
0.30σ), and a spacer shown in Table 5 was obtained to obtain a spacer for a liquid crystal display device.

[0046]

[Table 5] The particle size distribution of the obtained spacer for liquid crystal display device is shown in FIG.
As described above, there is a difference between the particle size distribution on the smaller side and the particle size distribution on the larger side, but the difference is small. Although it can be sufficiently used as a spacer, it has a particle size distribution close to a normal distribution and is not much different from conventional spacers.

Reference Examples 1 to 5 Reference examples in which the difference ΔD between the average particle diameters of the large particles and the small particles to be blended and the blending amount were varied are shown in Table 6
It was shown to.

[0048]

[Table 6]

Example 3 and Comparative Example 3 A liquid crystal display element was produced using the various spacers obtained in Examples 1 and 2, Comparative Examples 1 and 2 and Reference Examples 1 to 5, and the display performance of each spacer was obtained. I investigated the effect on.

Assembly of Liquid Crystal Display Device As shown in the sectional view of FIG.
An ITO thin film of a transparent glass substrate 1 having a thickness of 7 mm is formed on a predetermined stripe electrode by photolithography,
An alignment control film was applied thereon, dried and heated, and this substrate was cut into a size of 5 cm × 12.5 cm to obtain a glass substrate for a liquid crystal display device. An epoxy resin-based sealing material 5 (Mitsui Toatsu Co., Ltd., Structbond) in which a predetermined glass fiber spacer is mixed around the glass substrate is provided with a liquid crystal injection hole 6 along the outer periphery of the substrate and a frame width of 10 mm. Screen-printed into a sheet and dried at a predetermined temperature.

This glass substrate was placed horizontally, the spacer A was scattered from above by pressurized nitrogen gas and dropped onto the substrate surface, and the spacers were practically and uniformly dispersed on the substrate.
The dispersion density of the spacers on the substrate is generally 100 to 2
Although it is set to 00 pieces / mm square, it can be increased or decreased according to the assembly conditions of the liquid crystal display element, the strength of the spacer, and the particle size distribution. , Controlled to a predetermined dispersion density.

Usually, if the spacer material, particle size distribution, dispersion density, etc. are different, the cell gap changes even if spacers having the same average particle size are used. The cell gap changes even if the assembly conditions are changed. The spacers used in this example were made to have the same mode particle size, but the particle size distributions are different, so the cell gap is different under certain assembly conditions. This is clear empirically and also in the literature on spacers for liquid crystal display elements (published by Sekisui Fine Chemical Company, Micropearl SF technical data, etc.).

In order to study the effect of the spacer for a liquid crystal display element of the present invention, the load at the time of sealing after liquid crystal injection described below was increased or decreased to adjust the cell gap to 6 μm. To obtain information on the required sealing load for each spacer,
The sealing load was predicted in advance by the cell gap simulation method described in the above document. The other counter substrate made by the same method as the above substrate is made to face the above-mentioned spacer-dispersed substrate, aligned and superposed, and pressed uniformly with a load of 1 kgf / cm ² with a heating press machine. Then, the epoxy sealing material was cured by heating at a temperature of 160 ° C. for 20 minutes.

The liquid crystal cell thus prepared was ultrasonically cleaned and dried, and then the inside of the cell was vacuum-suctioned, and liquid crystal was injected through the liquid crystal injection hole provided in the seal portion around the cell. After injecting the liquid crystal, it was left in a clean room environment for half a day with the injection hole open. Considering the sealing load at room temperature predicted in advance, press the top and bottom of the panel with a press machine to wipe away the liquid crystal slightly extruded from the injection hole and leave the load with a photo-curable adhesive ( Sekisui Fine Chemical Co., Ltd., Photorec-A-704) was spotted, the press load was released, and a predetermined amount of light of ultraviolet rays was applied to the injection hole to cure and seal the adhesive, thereby producing a liquid crystal display element. The required pressure at the time of sealing agreed well with the value predicted by the above simulation.

Evaluation of Liquid Crystal Display Device Regarding the liquid crystal display device manufactured by the above method, the following items were observed, and the respective observation results were summed up for the final evaluation. (1) Measurement of cell gap Liquid crystal display device gap measuring device (Oak Seisakusho Co., Ltd., T
It was measured and confirmed by using FM-120AFT type).

(2) Observation of display performance Polarizing plates are attached to the upper and lower surfaces of this liquid crystal cell so that the color tone of the reflected light applied to the liquid crystal display panel exhibits an orienting color. The color unevenness of the background color was observed. Furthermore, after vibrating the liquid crystal display element strongly, the color unevenness was observed. In addition, the electrode of the liquid crystal display element is 50v
The electric charge was gradually applied to and the image quality after static elimination was observed.

(3) Observation with Comparative Control Spacer The mode particle diameter of each of the Examples and Comparative Examples is taken as the average particle diameter, and the standard deviation thereof is the standard deviation obtained from the particle diameter distribution on the large particle side. A conventional spacer exhibiting a normal distribution is manufactured, and the dispersion density is increased or decreased so that the same sealing condition as the dispersion density (100 pieces / mm square) of the spacers of the comparative example and the comparative example is obtained. The required number of dispersions was compared to obtain the dispersion saving rate of the spacer of the present invention with respect to the conventional spacer.

(4) Evaluation Results (General Evaluation) The quality of the liquid crystal display device was comprehensively evaluated as follows. Mode value: Mode value particle size in particle size distribution = target cell gap. σ: Standard deviation in the larger particle size distribution in the particle size distribution. [sigma] '/ [sigma]: The mode particle size was used as the axis, and the ratio of the small side standard deviation to the large side standard deviation was used. Sealing: The sealing press pressure in the cell gap simulation and the actual sealing conditions are described.

Reduction rate: When the cell gap is set to 6 μm (modal particle diameter), the dispersion density of the spacer of the example or the comparative example is reduced with respect to the conventional spacer dispersion density which has a large standard deviation and is normally distributed. And rate. Room temperature: The display quality at room temperature was observed. High temperature: The display quality was observed when the temperature was raised to around 100 ° C. Impact: Vibration was applied even at room temperature, and changes in display quality (mainly color unevenness and brightness) were observed. Improvement level: A comprehensive evaluation focusing on the stability of display quality when high temperature or vibration is applied, and the improvement level was evaluated for each of the normal distribution spacers for comparison and contrast.

In the absolute evaluation of the display quality, the absolute value of the large standard deviation σ (ratio of σ to mode particle size = CV
The smaller the value), the better. Table 7 shows the evaluation results. In Table 7, ◎ is very good, ○ is good, Δ is a little good, × is bad, and unsuitable is a large σ with respect to the mode particle size (7.6%). It indicates that the substrate could not be suppressed to the modest particle size. If it is not suitable, it cannot be industrially used as a spacer.

[0061]

[Table 7]

From these results, the liquid crystal display device using the spacer for a liquid crystal display device of the present invention is a liquid crystal using a spacer in which the conventional particle size distribution is represented by a normal distribution with the large particle size distribution as a standard. It has been confirmed that the display quality is more stable than that of the display element, especially in a severe environment where high temperature and vibration are severe. The production of such fine particles having a distorted particle size distribution is almost impossible by the usual production method of polymer fine particles. The spacer for a liquid crystal display element of the present invention can be produced only by blending a plurality of fine particle groups with a certain standard as described above. Measure
By blending these, a spacer for a liquid crystal display device having a specific particle size distribution can be easily manufactured.

[0063]

Since the spacer for a liquid crystal display device of the present invention is as described above, a liquid crystal display device can be obtained with a small amount of dispersion, and the obtained liquid crystal display device is stable under a wide environment of use. The displayed image quality can be secured.

[Brief description of drawings]

FIG. 1 is a cross-sectional view schematically showing one embodiment of a liquid crystal display device of the present invention.

FIG. 2 is a particle size distribution of the spacer for a liquid crystal display device of the present invention. The vertical axis represents the number of particles, and the horizontal axis represents the particle size (μ
m). ○ solid line represents the particle size distribution of the spacer for liquid crystal display device of the present invention, □ chain line represents the normal distribution formed by the average particle size and standard deviation determined by the particle size distribution, ● ● dotted line The mode particle size in the particle size distribution of the liquid crystal display element spacer of the present invention is defined as an average particle size, and a normal distribution is shown based on the particle size distribution on the side larger than the mode particle size.

FIG. 3 is a particle size distribution of a spacer for a liquid crystal display element in Example 1. The vertical axis represents the number of particles, and the horizontal axis represents the particle diameter (μm). ○ The solid line represents the measured value of the particle size distribution, and the ● dotted line represents the normal distribution curve assuming particles with a particle size of 6 μm based on the standard deviation on the side larger than the mode particle size. Represents a normal distribution curve represented by the average particle size calculated from the measured particle size distribution and the standard deviation.

FIG. 4 is a particle size distribution of a spacer for a liquid crystal display element in Example 2. The vertical axis represents the number of particles, and the horizontal axis represents the particle diameter (μm). ○ The solid line represents the measured value of the particle size distribution, and the ● dotted line represents the normal distribution curve assuming particles with a particle size of 6 μm based on the standard deviation on the side larger than the mode particle size. Represents a normal distribution curve represented by the average particle size calculated from the measured particle size distribution and the standard deviation.

5 is a particle diameter distribution of a spacer for a liquid crystal display element in Comparative Example 1. FIG. The vertical axis represents the number of particles, and the horizontal axis represents the particle diameter (μm).

6 is a particle size distribution of a spacer for a liquid crystal display element in Comparative Example 2. FIG. The vertical axis represents the number of particles, and the horizontal axis represents the particle diameter (μm). The solid circle line represents the particle size distribution curve of the obtained spacer for liquid crystal display device, and the solid line represents the normal distribution curve obtained from the particle size distribution on the side larger than the mode particle size.

[Explanation of symbols]

 1 Transparent Glass Substrate 2 Transparent Electrode 3 Alignment Film 4 Polarizing Plate 5 Sealing Material 6 Liquid Crystal Injection Port 7 Liquid Crystal Injection Port Sealant 8 Liquid Crystal 9 Liquid Crystal Display Element A Spacer for Liquid Crystal Display Element

Claims (4)

[Claims] 1. A spacer for a liquid crystal display device having elasticity, wherein the average particle size in the particle size distribution of the spacer for the liquid crystal display device is 1 to 100 μm, and the mode particle size in the particle size distribution. A spacer for a liquid crystal display element, wherein a standard deviation in a particle size distribution on a smaller side is smaller than a standard deviation in a particle size distribution on a side larger than the mode particle size. 2. The particles are classified based on the particle size.
A method for producing a spacer for a liquid crystal display element having elasticity, which is produced by blending fine particle groups of at least one kind so that the particle diameter distribution of the spacer for a liquid crystal display element has a specific distribution, Has an average particle size of 1 to 10
The standard deviation of the particle size distribution of the fine particle group classified into the average particle diameter smaller than the mode particle diameter is 0 μm, and the standard deviation of the fine particle group classified into the average particle diameter larger than the mode particle diameter. Smaller than, and the amount of fine particles grouped into the average particle size smaller than the mode particle size, and the amount of fine particles grouped into the average particle size larger than the mode particle size The ratio is 3: 7 by weight.
A method for manufacturing a spacer for a liquid crystal display device, characterized in that it is 7: 3. 3. The method for manufacturing a spacer for a liquid crystal display element according to claim 2, wherein at least one of the two or more kinds of fine particle groups is a mixture of fine particle groups having a similar particle size distribution. 4. A liquid crystal characterized by comprising the liquid crystal display element spacer according to claim 1 dispersed in a liquid crystal panel, wherein the cell gap is not more than the mode particle size of the liquid crystal display element spacer. Display element.