JPH09203904A - Method for spraying spacer for liquid crystal display element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to spray spacers uniformly to desired shapes by arranging conductive materials to specific shapes on the rear surface side of a transparent substrate and connecting these conductive materials to the ground. SOLUTION: The conductive material 7 is arranged to the specific shapes on the rear surface side of the transparent substrate 6 and these conductive materials 7 are connected to the ground 12, by which the spacers 5 for liquid crystal display elements are sprayed on the transparent substrate 6 of the liquid crystal display panel according to the specific shapes of the conductive materials 7. A nozzle 3 is connected by a dispersing device 1 disposed on the outside of a container and is used to mix the spacers 5 for the liquid crystal display element with air and to disperse these spacers and connecting pipe 2. In such a case, the conductive materials 7 are connected to the ground 12 and, therefore, the minus charges on the transparent substrate surface are neutralized in the parts where the transparent substrate 6 and the conductive materials 7 are in contact with each other. The spacers 5 for the liquid crystal display element discharged from the nozzle 3 are preferentially sprayed to the parts where the charges on the surface of the transparent substrate 6 are neutralized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for spraying spacers for liquid crystal display devices.

[0002]

2. Description of the Related Art In general, a liquid crystal display element is arranged such that a transparent substrate provided with a transparent electrode having an alignment layer is arranged to face a predetermined gap with a spacer for the liquid crystal display element, and the periphery is sealed, and then the gap is sealed. It is manufactured by injecting liquid crystal and sealing the injection port. The liquid crystal display element spacer is used to keep the gap between the transparent electrode substrates constant. Such liquid crystal display device spacers are sprayed by a dry spraying method in which the liquid crystal display device spacers, which are dispersed in a gas with the transparent substrate horizontally installed in the container, are sprayed through the nozzles from above. There is. However, in the conventional spraying method, the spacers for liquid crystal display elements are only uniformly sprayed over the entire transparent substrate, and it is difficult to selectively dispose the spacers for liquid crystal display elements in a specific shape.

Japanese Unexamined Patent Publication (Kokai) No. 3-21921 discloses a method of quantitatively discharging a mixture of a spacer for a liquid crystal display element and a volatile solvent onto a transparent substrate through a silk screen having fine holes. There is. However, since this technique uses a volatile solvent, it has a drawback in that a new device must be provided to recover the volatile matter.

In Japanese Patent Laid-Open No. 4-110827, a spacer for a liquid crystal display device, the surface of which is coated with a photo-melting photosensitive resin, is used, and the spacer is spread on a transparent substrate having a light-shielding plate, exposed, and then exposed. A method of developing a transparent substrate and removing a spacer for a liquid crystal display element on a transparent electrode is disclosed. However, in this technique, since the light-shielding plate must be provided on the transparent substrate itself, there is a drawback in that the number of steps for producing the liquid crystal display element increases.

Japanese Unexamined Patent Publication (Kokai) No. 7-5473 discloses a method of arranging a binder resin and a spacer for a liquid crystal display element by pressing through a printing plate having holes. However, this technique has a drawback in that a new device must be provided because a pressing device is required.

[0006]

DISCLOSURE OF THE INVENTION The present invention solves the above problems, and an object of the present invention is to allow spacers for liquid crystal display elements to be uniformly dispersed in a desired shape. An object of the present invention is to provide a method for spraying spacers for liquid crystal display elements.

[0007]

The above object is to provide a liquid crystal display disposed at the bottom of a container by spraying spacers for liquid crystal display elements dispersed in a gas from nozzles provided above the container. A method for spraying a spacer for a liquid crystal display device, which uniformly sprays the spacer for a liquid crystal display device on a transparent substrate of a panel, wherein the back surface side of the transparent substrate comprises:
By disposing the conductive material in a specific shape and connecting the conductive material to a ground, the spacers for the liquid crystal display element are scattered on the transparent substrate of the liquid crystal display panel according to the specific shape of the conductive material. It can be achieved by a method of spraying spacers for liquid crystal display elements. Hereinafter, the present invention will be described in detail.

As the above-mentioned nozzle, those used in the conventional dry dispersion method can be used. The nozzle is connected by a connecting pipe and a disperser for mixing and dispersing a gas for a liquid crystal display element spacer provided outside the container, and ejects and sprays the spacer for a liquid crystal display element as well as pushing out the gas. It is what makes me.

The above-mentioned conductive material is not particularly limited as long as it has conductivity, but among them, a conductive tape, a conductive sheet, etc. are preferable, and a black pattern-formed between RGB pixels of a color filter is particularly preferable. An example of the matrix is one having conductivity.

Examples of the conductive black matrix include pigment color filters described in JP-A-7-128516. This pigment color filter is provided with a driving element such as a TFT or MIM on one of the two substrates constituting a liquid crystal display, or with an ITO pattern formed without forming a driving element. A transparent conductive layer pattern made of ITO is formed on the other optically transparent support combined with the substrate, and red (R), green (G), and blue (B) patterns are formed on the electrode pattern. In the color filter in which the pixels or patterns of the colored layer are formed, the value of the specific resistance in the impedance after pattern formation of the black matrix formed between the RGB pixels of the color filter is AC5V, 10
1.0 × in the frequency range of 0 Hz to 100 kHz
It exists in the range of 10 ^{2 to} 1.2 × 10 ⁶ (Ω / m) and has a relative dielectric constant of 3.0 or more in the frequency region. In order to impart conductivity to the black matrix, it is preferable to use a carbon dispersion type resist, and the carbon content at that time is preferably in the range of 10 to 20% by weight based on the solid content in the resist.
Since such a conductive black matrix forms a fine and orderly pattern, it can be preferably used in the present invention.

In the present invention, the conductive material is arranged in a specific shape on the back surface side of the transparent substrate, and the conductive material is connected to the ground. Therefore, the transparent substrate and the conductive material are separated from each other. The negative charge on the surface of the transparent substrate is neutralized at the contacting portion. On the other hand, since the surface charges of the liquid crystal display element spacer are negative when dispersed in gas, the liquid crystal display element spacer discharged from the nozzle has a medium surface charge. It is preferentially applied to the harmonized parts. In this way, the spacers for the liquid crystal display element can be scattered according to the above-mentioned specific shape. Moreover, since the shape of the conductive material can be easily changed to a desired shape, when changing the shape of the spacers for liquid crystal display elements to be scattered, it is only necessary to change the shape of the conductive material. .

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

(Example 1) (1) Preparation of high-molecular polymer fine particles 2 g of benzoyl peroxide as a polymerization initiator was added to a monomer composition obtained by uniformly mixing 60 g of tetramethylolmethane triacrylate and 40 g of divinylbenzene. Was added and mixed uniformly. This mixture was put into 850 g of a 3% by weight polyvinyl alcohol aqueous solution, and well stirred, and then, using a homogenizer, monomer droplets having a particle size of about 3 to 3 were obtained.
The particles were suspended so as to have a fine particle size of 10 μm. This suspension was transferred to a 2 liter separable flask equipped with a thermometer, a stirrer and a reflux condenser, and heated to 85 ° C. while stirring in a nitrogen atmosphere to continue the polymerization reaction for 7 hours,
Further, the temperature was raised to 90 ° C. and maintained for 3 hours to complete the polymerization reaction. Thereafter, the polymerization reaction liquid obtained above was cooled, and the produced polymer fine particles were filtered and sufficiently dried to obtain 107 g of polymer fine particles having a particle size of about 3 to 10 μm. The high-molecular polymer fine particles are classified to have an average particle size of 6.
A spacer for a liquid crystal display device was obtained, which was composed of high-molecular polymer particles having a diameter of 17 μm and a standard deviation of 0.11 μm.

(2) Preparation of Black Matrix Corning Glass "7059" as a transparent support
ITO is formed on the glass substrate by a sputtering method to have a thickness of about 1500 Å.
Is patterned by acid etching by a photolithography method, then a carbon dispersion type resist is uniformly applied on the substrate by a spin coating method, and then prebaked at 60 to 70.
The exposure was performed at 10 ° C. for 10 to 20 minutes, and then, through a photomask, the exposure was performed in the range of 100 to 1000 mJ / cm ² . Finally, after developing with an alkaline developing solution, in a clean oven at 150 to 200 ° C.,
Firing was performed for 30 to 60 minutes to form a black matrix in which the patterned conductive material was arranged in a specific shape on the glass substrate.

(3) Spreadability of spacers for liquid crystal display elements
In order to evaluate the dispersibility of the spacer for liquid crystal display device obtained in the evaluation (1), the spacer was dispersed on a transparent substrate by the following method. The device shown in FIG. 1 was used for spraying the spacers for liquid crystal display elements. The above device is shown in FIG.
As shown in FIG. 3, in the chamber 4, a transparent substrate 6 of a liquid crystal display panel, a glass plate 8 having a black matrix in which a patterned conductive material 7 is arranged in a specific shape, and
A lab jack 10 is installed. Lab jack 10
Is used to set the height when the spacers 5 for liquid crystal display elements are scattered. An insulator 9 is installed between the lab jack 10 and the glass plate 8.

The transparent substrate 6 is placed opposite to the glass plate 8 having the black matrix. The black matrix is connected to the ground 12 via the ground wire 11.
Therefore, the surface of the transparent substrate 6 is neutralized by the negative charge according to the black matrix formed of the patterned conductive material 7. The spacer 5 for a liquid crystal display element is mixed with a gas in the disperser 1 and dispersed in the gas, and the surface is negatively charged. The negatively charged spacer for liquid crystal display element 5 is discharged from the nozzle 3 through the connecting pipe 2.

Spacer 5 for ejected liquid crystal display element
Since it is negatively charged by itself, it is preferentially dispersed on the portion of the surface of the transparent substrate 6 shown in FIG. 2 that is in contact with the neutralized black matrix.

In the present embodiment, the patterned conductive material 7 is arranged on another substrate such as a glass plate so that it can be used as an original plate. In the present invention, the back surface of the transparent substrate 6 is used. You may arrange as it is. The amount of the high-molecular polymer fine particles dispersed is 90 to 140 particles / m 2.
A range of m ² is preferred.

The spacers for liquid crystal display elements dispersed on the transparent substrate were observed with a magnifying glass as follows in order to evaluate the uniform dispersibility, and the evaluation results are shown in Table 1. (A) Xa: The average number of aggregates composed of 5 or more particles was calculated. (B) Sa: The sum of squares of the number of aggregates composed of 5 or more particles was calculated. (C) It was observed whether the spacers for the liquid crystal display element were dispersed according to the pattern of the black matrix.

Example 2 (1) Preparation of Inorganic Fine Particles <Production of Seed Particles> A dispersion liquid obtained by dispersing 21 g of tetraethoxysilane in 100 ml of methanol in a mixed liquid of 50 g of 28% by weight ammonia water and 100 ml of methanol was prepared. The mixture was added dropwise at a rate of 1 ml / min with stirring at 5 ° C. for reaction. The reaction solution was stirred at 5 ° C. for 24 hours,
Further, the mixture is stirred at 20 ° C for 24 hours, and the average particle size is 1.52
m and a standard deviation of 0.038 μm to obtain a reaction liquid containing fine silica particles having a uniform particle diameter. Such silica fine particles are
The seed particles were subjected to the following growth.

<Growth of seed particles> 50 g of 28% by weight ammonia water was added to the reaction solution containing the seed particles obtained above.
And a mixed solution of 100 ml of methanol and a mixed solution of 21 g of tetraethoxysilane dispersed in methanol were added dropwise at a rate of 1 ml / min, and after completion of the dropping, the mixture was stirred at a reaction temperature of 30 ° C. for 12 hours. After repeating this operation a predetermined number of times, ammonia, water and methanol were removed from the reaction solution to obtain silica fine particles. The silica fine particles were classified to obtain a spacer for a liquid crystal display device, which is composed of silica fine particles and has the average particle diameter and standard deviation shown in Table 1.

Regarding the spacer for the liquid crystal display device,
It was spread on a transparent substrate in the same manner as in Example 1. The amount of spacers for the liquid crystal display element is 20 to 40 pieces / m.
It was set to m ² . With respect to the spacers for a liquid crystal display element scattered on the substrate, the uniform dispersibility of (a) to (c) was evaluated in the same manner as in Example 1.

(Comparative Example 1) Spacers for liquid crystal display elements were dispersed on a substrate in the same manner as in Example 1 except that a black matrix pattern was not formed at all, and a liquid crystal display element dispersed on the substrate. The spacers were evaluated in the same manner as in Example 1 (A) to (C).

(Comparative Example 2) Spacers for liquid crystal display elements were dispersed on the substrate in the same manner as in Example 2 except that the black matrix pattern was not formed at all, and the liquid crystal display elements dispersed on the substrate. The spacers were evaluated in the same manner as in Example 1 (A) to (C).

[0024]

[Table 1]

[0025]

EFFECTS OF THE INVENTION Since the method for spraying the spacer for a liquid crystal display element of the present invention is as described above, it is possible to uniformly disperse the spacer for a liquid crystal display element in a desired shape of the transparent substrate and to obtain a specific shape. It can be suitably used in the case of producing a liquid crystal display panel in which spacers for liquid crystal display elements need to be dispersed.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a method for spraying spacers for a liquid crystal display device of the present invention.

FIG. 2 is a schematic view showing a glass plate on which a black matrix pattern is formed.

[Explanation of symbols] 1 disperser 2 connection pipe 3 nozzle 4 chamber 5 spacer for liquid crystal display device 6 transparent substrate 7 patterned conductive material 8 glass plate 9 insulator 10 lab jack 11 ground wire 12 ground

Claims (1)

[Claims] 1. A liquid crystal display is provided on a transparent substrate of a liquid crystal display panel arranged at the bottom of the container by spraying spacers for liquid crystal display elements dispersed in a gas from a nozzle provided above the container. A method for spraying a spacer for a liquid crystal display device, which uniformly sprays a spacer for a device, wherein a conductive material is arranged in a specific shape on the back surface side of the transparent substrate, and the conductive material is connected to ground. A method for spraying a spacer for a liquid crystal display element, which comprises spraying the spacer for a liquid crystal display element on a transparent substrate of the liquid crystal display panel according to a specific shape of the conductive material.