JP2528516B2 - Liquid crystal display device manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing a liquid crystal display device in which spacers for uniformly maintaining the dimension between opposed substrates are uniformly dispersed.

[Conventional technology]

Generally, a liquid crystal display element has substrates facing each other, such as a glass substrate. Between the above-mentioned substrates, spacers for dispersing a gap formed between the substrates together with the liquid crystal material into a predetermined size are dispersed and interposed.

Conventionally, the above-mentioned liquid crystal display element is manufactured by interposing a spacer between substrates by the manufacturing method described below.

That is, as shown in FIGS. 3 and 4, the spacer is mixed with a gas 13 such as air or nitrogen. Then, the gas 13 is ejected from the nozzle 12 having a plurality or a single ejection hole while controlling the ejection time and the ejection pressure.

At this time, the substrate 11 is conveyed below the nozzle 12 in one direction such as the direction A, or is fixed on a table (not shown). Therefore, the spacer mixed with the ejected gas 13 is deposited on the substrate 11. The liquid crystal display element is manufactured by bonding the substrates 11 to each other or bonding the substrate 11 and the substrate 11 on which the spacers are not deposited.

As a result, in the liquid crystal display element, the spacer is attached to the substrate 11.
Since it can be dispersed and interposed between the substrates 11,
It is possible to keep the gap formed between them at a predetermined size.

[Problems to be Solved by the Invention]

However, the above conventional manufacturing method has a problem that it is difficult to disperse the spacers on the substrate 11 in a sufficiently uniform manner.

This is because the spacer density, which is the number of spacers contained in a certain volume, is spatially and temporally non-uniform, and further, the substrate 11 is in the gas 13 having the above-mentioned non-uniform spacer density. This is because it is transported in only one direction or is fixed.

That is, the gas 13 mixed with the spacer is ejected from the nozzle 12 as shown in FIG. However, the nozzle 12
The flow rate of the gas 13 ejected from the blowout holes formed in 1 is not always constant, and the spacer density is not always constant.

Therefore, the spacer density of the gas 13 located above the substrate 11 is non-uniform in all axial directions in the coordinate system of the three axes of the X axis, the Y axis, and the Z axis. Further, the spacer density is nonuniform over time t.

Therefore, when the substrate 11 is fixed in the gas 13 described above, the spacers that volume on the substrate 11 have a large non-uniformity in the dispersibility, which is the uniformity of dispersion in the X-axis and Y-axis directions. Further, when the substrate 11 is moved in the direction A in the gas 13, the spacers deposited on the substrate 11 have a large nonuniformity in the dispersibility in the Y-axis direction.

Thus, the spacers will be non-uniformly deposited on the substrate 11. As a result, the image quality of the liquid crystal display element deteriorates because the deposited spacers can be visually identified on the screen of the liquid crystal display element.

Therefore, the present invention provides a method for manufacturing a liquid crystal display element capable of improving the dispersibility of spacers deposited on the substrate 11 even if the spacer density of the gas 13 ejected from the nozzle 12 is non-uniform. Is intended.

[Means for solving the problem]

In order to solve the above problems, a method for manufacturing a liquid crystal display element according to the present invention is to mix a spacer that maintains a constant dimension between a pair of opposing substrates forming a liquid crystal display element with a gas, and the gas is blown out by It is ejected from the formed nozzle, and spacers are deposited on the substrate in the ejected gas,
In a method of manufacturing a liquid crystal display device, in which a substrate on which the spacers are deposited, or a substrate on which the spacers are deposited and a substrate on which the spacers are not deposited are opposed to each other and are adhered, the spacers are deposited on the substrate in a gas. The substrate is characterized by being subjected to an arbitrary movement that is a combination of movement and rotation on the same plane.

[Work]

According to the above configuration, the gas ejected from the nozzle is
It has a spacer density, which is the number of spacers contained in a fixed volume. The spacer density is spatially and temporally non-uniform.

However, the substrate undergoes an arbitrary movement that combines movement and rotation on the same plane in the gas.
Therefore, the spacer will be uniformly deposited on the substrate by any of the above movements. As a result, even if it is difficult to keep the spacer density ejected from the nozzles uniform with the current technology, the spacers deposited on the substrate
The dispersibility will be improved.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

When carrying out the method for manufacturing a liquid crystal display device according to the present invention, as shown in FIG. 1, first, a spacer is mixed with a gas 3 such as air or nitrogen. For the spacer, for example, plastic beads or the like are used so that the dimension between the pair of opposed substrates forming the liquid crystal display element can be kept constant.

The gas 3 mixed with the spacers is ejected from the nozzle 2 having a plurality of ejection holes while the ejection time is, for example, 1 second or less and the ejection pressure is controlled to, for example, 1 kg / cm ² . The above-mentioned discharge time and discharge pressure can be arbitrarily changed according to the purpose of use. Further, the number of blowout holes formed in the nozzle 2 may be one.

At this time, the substrate 1 is arranged below the nozzle 2. The substrate 1 rotates about the rotation center point O in the B direction or the C direction, and is reciprocated in the D direction and the E direction. Further, the substrate 1 has passed through the surface formed by the X axis and the Y axis (hereinafter referred to as the XY surface) a plurality of times.

Thereby, the spacers are uniformly dispersed and deposited on the substrate 1. And the liquid crystal display element is
It is manufactured by bonding the above-mentioned substrates 1 to each other or by bonding the above-mentioned substrate 1 and the substrate 1 on which the spacers are not deposited.

Next, the dispersibility of the deposited spacers was compared between the manufacturing method of this example and the conventional manufacturing method. Table 1 shows the results.

The above dispersibility was calculated by the following calculation formula (1).

[(MAX−MIN) / MAX + MIN] × 100 (%) (1) where MAX is the number of spacers at the position where the spacer density is highest in the substrate 1. Further, MIN is the number of spacers at the position where the spacer density is the smallest in the substrate 1.

From the above comparison results, the dispersibility of the spacer according to the manufacturing method of the present embodiment is within 25%, while the dispersibility of the spacer according to the conventional manufacturing method has a wide variation of 10 to 60%. It turned out that it was settled.

This is because the substrate 1 in this embodiment is rotated and moved in the gas 13 having a spatially nonuniform spacer density.

That is, the substrate 1 is capable of uniformly depositing the spacers in the gas 13 in the X-axis and Y-axis directions by reciprocating the rotation center point O of the substrate 1. Further, the non-uniform spacer density at time t can be made uniform by the substrate 1 passing the XY plane a plurality of times.

In addition, the non-uniform spacer density in the Z-axis direction is due to the spacers in the gas 13 settling with time,
It can be regarded as equivalent to the non-uniform spacer density at the time t. Therefore, the non-uniform spacer density in the Z-axis direction is
Uniformity can be achieved by the substrate 1 passing the XY plane a plurality of times.

As a result, in the liquid crystal display element, the dispersibility of the spacers deposited on the substrate 1 is improved and the image quality is improved.

In the present embodiment, the substrate 1 rotates in the B direction or the C direction around the rotation center point O and reciprocates in the D direction and the E direction, but the present invention is not limited to this. That is, the substrate 1 may be arbitrarily combined with a closed-loop motion such as a rotational motion or an elliptic motion or a reciprocating motion on the same plane of the XY plane.

Therefore, as shown in FIG. 2, the substrate 1 rotates, for example, in the B direction or the C direction around the rotation center point O, and moves circularly in the F direction or the G direction around the other rotation center point O _1. It may be performed, or various movements that draw a closed loop such as an elliptic movement may be performed.

〔The invention's effect〕

As described above, in the method for manufacturing a liquid crystal display element according to the present invention, the spacer for keeping the dimension between the pair of opposed substrates forming the liquid crystal display element constant is mixed with the gas, and the gas is blown to form the blowout hole. A liquid crystal which is ejected from a nozzle, and a spacer is deposited on the substrate in the ejected gas, and the substrates on which the spacers are deposited or the substrates on which the spacers are deposited and the substrates on which the spacers are not deposited face each other and are bonded together. In the method of manufacturing the display element, when the spacer is deposited on the substrate in the gas, the substrate is subjected to an arbitrary movement that is a combination of movement and rotation on the same plane.

Although the spacer density of the gas ejected from the nozzle is non-uniform only by moving the substrate in one direction to deposit the spacers, the spacers are non-uniformly deposited on the substrate.
As a result, by rotating the substrate along with the movement, even if the spacer density of the gas ejected from the nozzle is non-uniform, it is possible to improve the dispersibility of the spacers deposited on the substrate. Therefore, there is an effect that the image quality can be improved.

[Brief description of drawings]

1 and 2 show one embodiment of the present invention. FIG. 1 is a plan view showing a state in which a liquid crystal display element is manufactured with a rotational movement and a reciprocating movement. FIG. 2 is a plan view showing a state in which a liquid crystal display element is manufactured by a rotary motion having two different rotation center points. 3 and 4 show a conventional example. FIG. 3 is a plan view showing a state in which the liquid crystal display device is manufactured by moving in the A direction. FIG. 4 is a perspective view showing a state in which the liquid crystal display element is manufactured by moving in the A direction. 1 is a substrate, 2 is a nozzle, and 3 is a gas.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Shigemitsu Mizushima 22-22 Nagaike-cho, Abeno-ku, Osaka City, Osaka Prefecture Sharp Corporation (56) References JP-A-59-143125 (JP, A) 187121 (JP, U)

Claims (1)

(57) [Claims] 1. A spacer for maintaining a constant dimension between a pair of opposed substrates forming a liquid crystal display element is mixed with a gas, and the gas is ejected from a nozzle having an ejection hole, and the substrate is placed in the ejected gas. In a method of manufacturing a liquid crystal display device, in which a spacer is deposited on the substrate and the substrates on which the spacer is deposited, or the substrate on which the spacer is deposited and the substrate on which the spacer is not deposited are faced to each other and bonded to each other. A method of manufacturing a liquid crystal display device, wherein when the spacer is deposited on the substrate, the substrate is subjected to an arbitrary movement that is a combination of movement and rotation on the same plane.