JP3208645B2 - Manufacturing method of liquid crystal display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a liquid crystal display device. More specifically, the present invention relates to a method for manufacturing a liquid crystal display device capable of improving display quality by reducing the density of spacers in pixels.

[0002]

2. Description of the Related Art In a conventional liquid crystal display device, a liquid crystal and a spacer material are provided between a pair of electrode substrates provided with electrodes on opposing inner surfaces, and an electric field is applied to the liquid crystal by using the electrodes to align the liquid crystal. And an image is displayed according to the state of the transmitted light. Specifically, FIG.
6 is configured as shown in FIG.

FIG. 4 is a plan view of the liquid crystal display device as viewed from the display surface side, FIG. 5 is a sectional view taken along line II in FIG. 4, and FIG. 6 is an enlarged view of the display section II in FIG. In the figure, reference numerals 1 and 2 denote first and second substrates provided with electrodes, respectively, on which electrodes 3, 4 are provided in a predetermined pattern, respectively. , Electrodes 3 and 4 are arranged so as to face each other at a predetermined interval. Reference numeral 5 denotes a transfer material for obtaining electrical conduction between the electrodes 3 and 4. Reference numeral 6 denotes a sealing member for sealing the periphery of the space formed by the first and second substrates 1 and 2, and 7 denotes sealing in the space formed by the first and second substrates 1 and 2. Reference numeral 8 denotes a liquid crystal injection port into which the liquid crystal 7 is injected into the space. The liquid crystal injection port 8 is formed by not providing the seal member 6 partially but not entirely around the space. In addition, predetermined silica or the like is mixed in the seal member 6 as a spacer material (not shown) to maintain a gap between the first and second substrates 1 and 2. Reference numeral 9 denotes an injection port sealing material for enclosing the liquid crystal injection port 8, 10 denotes a spacer material provided to maintain a gap in the display section of the first and second substrates 1 and 2, and 11 and 12 denote liquid crystals 7. An alignment film for regularly arranging the wirings 13 is a wiring portion.

[0004]

In order for the display by such a liquid crystal display device to be a bright and uniform display, it is necessary to minimize the factor of scattering transmitted light in the pixel. However, in the conventional liquid crystal display device, although the spacer material 10 is provided on the surfaces of the electrode substrates 1 and 2 facing each other, the spacer material 10 is distributed not only outside the pixel but also inside the pixel.

[0005] For example, as shown in FIGS. 6 and 7, the spacer material 10 is substantially the same as the region inside the pixel P and the region where the wiring portion 13 is wired, such as under the black matrix of the color filter outside the pixel P. Are distributed at a density of

[0006] The spacer material 10 is often made of a resin, but a white material, in particular, scatters transmitted light and impairs the display quality of a liquid crystal display device. Recently, there is a black spacer material for the purpose of preventing scattering of transmitted light,
Absorption of a part of the transmitted light by the spacer material 10 leads to a decrease in light transmittance, which is disadvantageous for low power consumption.

Further, in the vicinity of the spacer material 10, as compared with other regions, the display quality is degraded due to display defects caused by disorder of the regularity of the liquid crystal due to a change in the surface state of the alignment film. Is becoming a problem.

The present invention has been made to solve such a problem, and provides a method of manufacturing a liquid crystal display device capable of improving display quality by moving a spacer material 10 in a pixel outside the pixel. The purpose is to do.

[0009]

According to the present invention, there is provided a method of manufacturing a liquid crystal display device comprising the steps of: (a) using a sealing material except for a liquid crystal injection hole around one of a pair of electrode substrates provided with electrodes on opposing inner surfaces; (B) a step of spraying a liquid containing a spherical spacer on the other or one of the electrode substrates; and (c) the pair of substrates are arranged to face each other with a gap maintained by the spherical spacer, and the sealing material is used. Sealing, (d) filling the gap between the pair of substrates with liquid crystal from the liquid crystal inlet, and (e) sealing the liquid crystal inlet with an inlet sealing material to produce a liquid crystal cell. a process for preparing a liquid crystal display device having a step, possess the after the step (e), a further step (f) moving the spherical spacers by pressurizing from the outside with respect to the entire surface of the liquid crystal cell, Said one
At least one of the paired substrates has a plurality of wirings and
A pixel region surrounded by a line is provided;
By moving the spherical spacer in (f),
The density of the spherical spacer in the pixel area is
The feature is to make it smaller .

[0010]

[0011]

[0012]

[0013]

[0014]

[0015]

[0016]

[0017]

[0018]

[0019]

According to the present invention, a liquid crystal is filled in a liquid crystal cell, a liquid crystal injection port is sealed, and then a pressure is applied to the liquid crystal cell from the outside of the liquid crystal cell. It moves below the black matrix of the color filter outside the pixel. Therefore, since the density of the spacers inside the pixel is relatively low, the pixel quality is improved such as a bright and uniform display.

Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG.
FIG. 4 is a cross-sectional explanatory view showing a method of uniformly pressing the entire liquid crystal cell from the display surface side using a cylindrical roller made of rubber as one embodiment of a method of manufacturing the liquid crystal display device of the present invention. In addition, among the reference numerals in FIG. 1, those having the same reference numerals as those in FIGS. 5 and 6 showing the conventional example indicate the same components shown in FIGS. Reference numeral 14 denotes a rubber-made cylindrical roller, which rolls in the direction of A while pressing the roller in pressure contact with the liquid crystal display device. FIG. 2 is an enlarged view of a part of the display unit after pressing by a roller. FIG. 3 is a sectional view taken along line IV-IV in FIG.

The liquid crystal display device shown in FIG. 5 is manufactured as follows.

As an embodiment, first, a screen is formed by using a thermosetting epoxy resin mixed with 1% by weight of a glass spacer material as a sealing material 6 on the electrode forming side of an electrode substrate 2 which is a vertically opposed glass substrate. Printed by the printing method.

On the other hand, a material obtained by sufficiently dispersing 101.5% by weight of a 5 μm spherical resin spacer in a solvent such as isopropyl alcohol is used to improve the controllability of the substrate gap in the display section from 100 to 150 pieces / mm ^2. At a density of 1.

Next, after the two electrode substrates 1 and 2 are bonded together and the sealing material 3 is cured in a curing furnace, the space between the electrode substrates 1 and 2 surrounded by the sealing material 3 is injected under reduced pressure. To inject the liquid crystal 7.

Thereafter, an ultraviolet curing resin is applied to the injection port as the injection port sealing material 9, and the injection port sealing material is cured by irradiating the injection port sealing material with ultraviolet rays for one minute. The later liquid crystal was sealed between the electrode substrates. At this time,
From the time when the injection port sealing material 9 is applied to the injection port to the time when the resin 5 is hardened, generally referred to as pressure sealing.
A liquid crystal cell was manufactured by sealing the injection port of the liquid crystal display device by a method in which pressure was applied so as to sandwich two electrode substrates.

At this time, as shown in FIGS. 6 and 7, the spacer material 10 is applied to the region in which the wiring portion 13 is wired, such as the region inside the pixel P and the region outside the pixel P, such as under the black matrix of the color filter. It is distributed at a moderate density.

In the above embodiment, electrodes 3 and 4 having a predetermined pattern are provided on the inner surfaces of the first and second substrates 1 and 2 facing each other. The lead-out pattern for connecting the electrodes 3 and 4 and an external circuit (not shown) is provided in the protruding portion of the first substrate 1 which is larger in area than the substrate 2.

Thereafter, as shown in FIG.
The liquid crystal cell is pressed from the outside over the entire surface by rolling while uniformly pressing the liquid crystal cell from above using the liquid crystal cell 4. As a result, as shown in FIGS. 2 and 3, a flow occurs in the liquid crystal, and the spacer material 10 also moves along with the flow, so that the wiring portion 13 outside the pixel P is wired from the region inside the pixel P. The spacer material 10 moves to the region. Therefore, since the density of the spacer material 10 in the region within the pixel P is reduced, it is possible to preferably prevent the deterioration of the display image quality caused by the scattering of the transmitted light by the spacer material 10.

When pressure is applied to the entire surface of the liquid crystal cell using the cylindrical roller 14, if a roller whose width is larger than the length and width of the liquid crystal cell is used, the liquid crystal cell can be made uniform. , So that the quality of all the pixels can be made uniform. But,
The present invention is not limited to this. Even if pressure is applied to the entire surface of the liquid crystal cell by a plurality of pressing operations using a narrow cylindrical roller, the spacer material as described above can be used. Needless to say, an effect of moving the pixel out of the pixel region can be obtained.

Further, as another method of applying pressure to the entire surface of the liquid crystal cell, a method of applying pressure using an object having a flat surface may be adopted. Also in this case, an effect of moving the spacer material out of the pixel region as described above can be exerted. Also, when pressure is applied using an object having such a plane, if the area of the plane is larger than the area of the liquid crystal cell, the liquid crystal cell can be pressed uniformly, so that the quality of all pixels can be uniform. can do. In addition,
Conversely, even if the entire surface of the liquid crystal cell is pressed by a plurality of pressing operations using an object having a plane smaller than the area of the liquid crystal cell, the spacer material can be moved as described above. Needless to say.

As still another pressing method, at least one
Pressurization may be performed on the entire surface of the liquid crystal cell using the suction cups. Also in this case, an effect of moving the spacer material out of the pixel region as described above can be exerted. The number of suction cups is not particularly limited, and may be appropriately selected by comparing the bottom area of the suction cups with the area of the liquid crystal cell. In particular, when there are four suction cups, it is preferable to dispose the suction cups near the four corners of the liquid crystal cell because the entire liquid crystal cell can be uniformly pressed.

When the entire surface of the liquid crystal cell is pressurized from the outside as described above, the pressure for the pressurization is 10 kgf / cm ² (9.
8 × 10 ⁴ Pa) or less, and 1 kgf / cm ² (9.8
It is preferable to apply pressure at a pressure of not more than × 10 ³ Pa).

Example 2 A liquid crystal display device similar to that of Example 1 as shown in FIG. 4 was manufactured.

Further, the ultrasonic transmission frequency is 800 kHz.
Put the liquid crystal display device of FIG. 4 in the ultrasonic oscillation tank of about
Water was poured into the ultrasonic generating tank so that the entire liquid crystal display device was immersed.

Next, an ultrasonic wave of about 800 kHz was oscillated in the ultrasonic oscillation tank, and the liquid crystal display was allowed to stand in the tank for 1 minute to uniformly apply vibration to the entire liquid crystal display.

By performing the process in the ultrasonic oscillation tank according to the above-described embodiment, as shown in FIGS. 2 and 3, the spacer material 10 is moved from the display pixel portion to the wiring portion below the black matrix of the color filter. 13 can be moved.

In this embodiment, an example in which shock or vibration is applied to the liquid crystal cell via the liquid has been described. However, the present invention is not limited to this. For example, the liquid crystal cell is passed through an ultrasonic dry cleaning apparatus. For example, even if shock or vibration is applied through a gas such as air, the spacer material can be moved out of the pixel region as described above.

As described above, when an external vibration is applied to the entire surface of the liquid crystal cell, the vibration frequency is 10 MHz or less, and further, 3 MHz, in consideration of the strength of the liquid crystal cell.
It is preferred that:

[0039]

As described above, in the liquid crystal display device manufactured by the manufacturing method of the present invention, the spacer material moves from the pixel portion to the wiring portion as compared with the liquid crystal display device manufactured by the prior art, and Since the number of spacers in the portion is reduced, scattering of light transmitted through the liquid crystal display device is reduced.

Further, since the number of spacer materials in the pixel is smaller than that of the related art, uniform display can be performed without disturbing the surface state of the alignment film.

According to the present invention, the display quality is improved by the method according to the present invention as compared with the liquid crystal display device manufactured by the prior art.

[Brief description of the drawings]

FIG. 1 is a diagram of a manufacturing method according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a portion corresponding to a portion II in FIG. 4 according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view taken along the line IV-IV of FIG. 2 according to the first embodiment of the present invention.

FIG. 4 is a top view of a conventional liquid crystal display device.

FIG. 5 is a cross-sectional view taken along line II of FIG. 4 of the conventional liquid crystal display device.

6 is an enlarged view of a portion II of FIG. 4 of the conventional liquid crystal display device.

FIG. 7 is a cross-sectional view of the conventional liquid crystal display device taken along line III-III of FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 electrode substrate 2 electrode substrate 3 electrode 4 electrode 5 resin 6 sealing material 7 liquid crystal 8 liquid crystal injection port 9 injection sealing material 10 spacer material 13 wiring section 14 roller

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Akiki Toshima 997 Miyoshi, Nishigoshi-cho, Kikuchi-gun, Kumamoto Inside Advanced Display Co., Ltd. (56) References JP-A-4-163526 (JP, A) JP-A-7- 294944 (JP, A) JP-A-64-55519 (JP, A) JP-A-2-304525 (JP, A) JP-A-6-130342 (JP, A) JP-A-4-172323 (JP, A) JP-A-4-204714 (JP, A) JP-A-6-76930 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G02F 1/1339 G02F 1/1341 G02F 1/1333 G02F 1/13 101

Claims (1)

(57) [Claims] (A) a step of providing a sealing material except for a liquid crystal injection port around one of the pair of electrode substrates having electrodes on inner surfaces facing each other; (b) the other or the one of the electrode substrates A step of spraying a liquid containing a spherical spacer thereon; (c) a step of disposing the pair of substrates to face each other while keeping a gap with the spherical spacer, and sealing with the sealing material; Filling a gap with liquid crystal from the liquid crystal injection port; and (e) sealing the liquid crystal injection port with an injection port sealing material to produce a liquid crystal cell. to after the (e), further (f) it has a step of moving the spherical spacers by pressurizing from the outside with respect to the entire surface of the liquid crystal cell, at least one of the pair of substrates, a plurality of wires and
A pixel region surrounded by the wiring is provided,
By moving the spherical spacer in step (f),
The density of the spherical spacer in the pixel area to another area.
A method for manufacturing a liquid crystal display device, characterized in that the liquid crystal display device is made smaller than that of the area .