JP3217523B2 - Manufacturing method of liquid crystal display device - Google Patents

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,
The present invention relates to a method for manufacturing a liquid crystal display device in which a spacer is arranged between a pair of glass substrates on which electrodes are formed.

[0002]

2. Description of the Related Art Heretofore, there has been known a liquid crystal display device in which a spacer is disposed between a pair of glass substrates on which electrodes are formed in order to keep a constant distance between the glass substrates. This type of liquid crystal display device is manufactured by the following method.

[0003] First, an IT is placed on a pair of glass substrates.
After forming a transparent electrode made of O in a predetermined pattern, an alignment film is formed on the transparent electrode. Subsequently, in order to keep the distance between the glass substrates constant, a resin spacer is uniformly spread on one of the glass substrates. The size of each spacer is
It is spherical, for example, about 0.2 to 0.3 μm larger than the distance between the glass substrates.

[0004] As a method of spraying the spacer, one glass substrate is placed in a sealed sprayer, and an appropriate amount of a highly volatile solvent in which the spacers are uniformly mixed is sprayed from above the glass substrate into the air. There is known a method in which the spacers are uniformly dispersed and the spacers are naturally dropped on a glass substrate.

After that, the glass substrate on which the spacers are scattered and the other glass substrate are arranged to face each other, and the peripheral portions of the glass substrates are bonded and fixed with a sealing agent to form a cell. Subsequently, liquid crystal is sealed between the two glass substrates to form a liquid crystal display device.

[0006]

In distributing the spacers as described above, it is important to control the number of spacers distributed on the glass substrate. That is, if the spacers are not uniformly spread on the surface of the glass substrate, gap unevenness occurs between the glass substrates, and display unevenness occurs when the liquid crystal panel is turned on. In addition, when the number of spacers to be scattered is small, the gap between the glass substrates cannot be maintained at a predetermined value, and display unevenness occurs and the original characteristics cannot be exhibited.

In the above-mentioned sprinkling of spacers by natural fall, a large number of spacers are sprinkled on the transparent electrode of the glass substrate. Liquid crystal does not exist in the portion where the spacer is present on the transparent electrode. For example, in a normally black transmission type liquid crystal module, the light of the backlight transmits through this portion, and a bright spot appears on the liquid crystal panel. Exists. Since the brightness does not change even when a voltage is applied to the bright spot, the brightness becomes substantially the same as a decrease in the aperture ratio, which causes a decrease in contrast.

An object of the present invention is to provide a method of manufacturing a liquid crystal display device capable of manufacturing a liquid crystal display device without causing display unevenness and a decrease in contrast. is there.

[0009]

In order to achieve the above-mentioned object, the manufacturing method of the present invention is arranged such that a predetermined distance is left between each other.
A plurality of strip-shaped transparent electrodes extending in parallel,
A plurality of strip-shaped blocks provided between bright electrodes and extending parallel to each other
A step of preparing a pair of substrates each having a rack matrix, and the same pattern as the black matrix.
Preparing an electrode substrate having a plurality of strip-shaped electrodes formed on the substrate, and placing one of the substrates on the electrode substrate so that the black matrix matches the electrodes of the electrode substrate; Dispersing a spacer charged to a predetermined charge from above the one substrate; and
A charge opposite to the charged spacer is applied to the plurality of electrodes to attract the scattered spacers onto each of the black matrices and to cover the entire area on each black matrix.
And spraying .

[0010]

According to the method of manufacturing a liquid crystal display device according to the present invention,
The spacer is charged using a high voltage at the time of spraying the spacer, and the substrate is placed on an electrode plate to which a charge opposite to that of the charged spacer is applied, and the spacer is sprayed. Low and high on the black matrix. Thereby, the backlight light passing through the spacers is reduced, and a liquid crystal panel with high contrast can be manufactured. In addition, the spacers can be spread almost uniformly on the black matrix, and the distance between the pair of substrates can be kept constant over the entire area.

[0011] By attracting the spacer onto the substrate by using an electric force, it is possible to reduce the spraying time as compared with the case of spraying the spacer by natural fall. Further, instead of charging the transparent electrode on the glass substrate, a charge is given to the patterned electrode plate to attract the spacer. This eliminates the need for a substrate charging step, which is advantageous for the production yield of the liquid crystal display device, and also eliminates the dispersion of the spacer dispersion caused by the difference in the degree of charging between the substrates. In addition, the manufacturing method of the present invention described above can be implemented with a small change that only requires installation of an electrode plate in a current electrostatic sprayer.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; FIG. 1 shows an example of a liquid crystal display device manufactured by the manufacturing method according to the present invention. Hereinafter, a method for manufacturing the liquid crystal display device will be described together with the configuration of the liquid crystal display device.

First, a pair of glass substrates 16 are prepared, and a number of band-shaped transparent electrodes 1 made of ITO are formed on each glass substrate.
8 is formed. The transparent electrodes 18 extend in parallel with a predetermined interval. Subsequently, a black matrix 20 for preventing light from leaking from the backlight is formed between the adjacent transparent electrodes 18 and along the outer edges of the transparent electrodes located at both ends of the glass substrate 16. An alignment film 24 is formed on the glass substrate 16 so as to cover the matrix 20. Thereafter, a deflection film 26 is formed on the outer surface side of each glass substrate 16 so that the pair of substrates 1 is formed.
0 and 12 are formed. The transparent electrode 18 on the substrate 12
Are formed to extend in a direction orthogonal to the transparent electrode 18 of the substrate 10.

Subsequently, a spacer 27 made of resin is sprayed on one substrate, for example, the substrate 10 by using a sprayer 25. In this case, first, as shown in FIG. 2, an electrode plate 30 having electrodes 28 formed in the same pattern as the black matrix 20 of the substrate 10 is prepared. And FIG.
As shown in the figure, the electrode plate 30 is placed in the closed container 32 of the sprayer 25.
The substrate 10 is placed on a stage 34 provided at the bottom inside, and the substrate 10 is further placed on an electrode plate. At this time, as shown in FIG. 2, the substrate 10 is arranged so that the black matrix 20 of the substrate 10 matches the electrode 28 of the electrode plate 30 and the transparent electrode 18 faces upward.

Next, by the air gun 36 of the sprayer 25,
An appropriate amount of a highly volatile solvent in which the spacers 27 are uniformly mixed is jetted from above the substrate 10 and dispersed in the closed container 32. At the same time, a high voltage is applied to the spacer 27 by the charger 38 of the sprayer 25 to charge each spacer. In addition, the size of each spacer 27 is
Is larger than the interval of, for example, 0.2 to 0.3 μm.

On the other hand, a charge opposite to that of the charged spacer 27 is applied to the electrode 28 of the electrode plate 30. As a result, the spacer 27 is attracted to the electrode 28 and drops onto the black matrix 20 located in agreement with the electrode 28. Accordingly, the distribution density of the spacers 27 on the substrate 10 is low on the transparent electrode 18 and high on the black matrix 20, as shown in FIG.

Thereafter, the substrate 1 on which the spacer 27 is
0 and the other substrate 12 are arranged to face each other, and the peripheral portions of the substrates are bonded and fixed by a sealing agent 40 to form a cell. Subsequently, a liquid crystal 42 is sealed between the two substrates 10 and 12 to form a liquid crystal display device.

According to the manufacturing method configured as described above, the spacer is charged using a high voltage at the time of spraying the spacer 27, and the substrate having the electrode to which the charge opposite to the charged spacer is applied is placed on the electrode plate. On the substrate to reduce the scattering density of the spacers on the substrate.
On the black matrix 20. Therefore, the number of the spacers 27 located on the transparent electrode 18 can be significantly reduced, and the occurrence of a bright spot can be prevented. As a result, a high-contrast liquid crystal display device can be manufactured. In addition, the spacers can be spread almost uniformly on the black matrix, and the distance between the pair of substrates can be kept constant over the entire area.

The spacer 27 is attached to the substrate 1 by using electric force.
By attracting on the zero, it is possible to shorten the spraying time as compared with the case where the spacer is sprayed by natural fall. Furthermore,
Instead of charging the transparent electrode 18 on the substrate, a charge is given to the patterned electrode plate 30 to form a spacer 27.
Is attracting. This eliminates the need for a substrate charging step, which is advantageous for the production yield of the liquid crystal display device, and also eliminates the dispersion of the spacer dispersion caused by the difference in the degree of charging between the substrates. In addition, the above-described manufacturing method can be performed with a small change in which an electrode plate is installed in a current electrostatic sprayer.

The present invention is not limited to the above-described embodiment, but can be variously modified within the scope of the present invention. For example, the spacers may be sprayed on the substrate 12 instead of the substrate 10. Further, the manufacturing method of the present invention is not limited to the simple matrix type liquid crystal display device described above, but may be applied to an active matrix type liquid crystal display device and the like.

[0021]

According to the manufacturing method of the present invention configured as described above, in the spacer dispersing step, the dispersal density of the spacers on the substrate can be reduced on the transparent electrode and increased on the black matrix. In addition, it is possible to prevent the occurrence of a bright spot which causes a decrease in contrast. Therefore,
A method for manufacturing a liquid crystal display device capable of manufacturing a liquid crystal display device without causing display unevenness and a decrease in contrast can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view of a liquid crystal display device manufactured by a manufacturing method according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an arrangement relationship between a substrate and an electrode plate of the liquid crystal display device.

FIG. 3 is a sectional view schematically showing a sprayer.

FIG. 4 is a diagram showing the distribution density of spacers.

[Explanation of symbols]

10, 12: substrate, 16: glass substrate, 18: transparent electrode, 20: black matrix, 25: sprayer, 27 ...
Spacers, 28 ... electrodes, 30 ... electrode substrates.

Claims (1)

(57) [Claims] In a method of manufacturing a liquid crystal display device having a spacer disposed between two substrates , a plurality of strip-shaped transparent members extending parallel to each other at predetermined intervals.
A transparent electrode and the transparent electrode provided between the transparent electrodes.
A plurality of strip-shaped black matrices extending in rows
A step of preparing a pair of substrates, each having a pattern formed in the same pattern as the black matrix .
A step of preparing an electrode substrate having a plurality of strip-shaped electrodes; a step of placing one substrate on the electrode substrate so that the black matrix matches the electrodes of the electrode substrate; Spraying spacers charged to a predetermined charge from above, applying a charge opposite to the charged spacers to a plurality of electrodes of the electrode substrate, and placing the sprayed spacers on each of the black matrices. Attraction , each black matrix
Spraying over the entire area of the liquid crystal display device.