JP3246925B2 - Liquid crystal display panel and method of manufacturing the same - 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 panel and a method for manufacturing the same. More specifically, the present invention relates to a liquid crystal display panel capable of sealing an injection port after liquid crystal injection with high reliability and a method of manufacturing the same.

In a liquid crystal display panel, if the sealing force of the liquid crystal injection port is weak, the liquid crystal overflows out of the panel or bubbles are generated in the panel, so that the sealing is highly reliable and can be easily sealed. Stopping methods are required.

[0003]

2. Description of the Related Art As shown in FIG. 6, a conventional liquid crystal display panel includes a red R, green G, and blue B color filter 1, a top coat layer 2, a striped transparent electrode 3, and an alignment film 4. The upper glass substrate 5 on which is formed, and the lower glass substrate 5 'on which the stripe-shaped transparent electrode 3' and the alignment film 4 'are formed face each other with the spacer 6 interposed therebetween, and the periphery thereof is sealed with epoxy resin or the like. It is sealed with a material 7 and a liquid crystal 8 is sealed inside.

As shown in FIG. 7, a method for injecting the liquid crystal 8 of the liquid crystal display panel is as follows: a liquid crystal panel 9 is provided with a liquid crystal injection port 10; The liquid crystal 8 is injected into the liquid crystal panel by immersing the injection port 10 in the liquid crystal 8 and returning the bell jar 11 to the atmospheric pressure.

As shown in FIG. 6, after the liquid crystal 8 is injected in a bell jar, the injection port 10 is wiped to a certain extent with gauze or the like, a predetermined amount of an ultraviolet curing resin 13 is applied, and ultraviolet light is irradiated. By doing so, sealing was performed.

[0006]

In the above conventional liquid crystal sealing method, there is a method of applying a fixed amount of an ultraviolet curable resin by using a manual operation and a dispenser. In a manual operation, a considerable amount of skill is required to apply a certain amount of resin, and there is also a problem that the reliability is poor even when applying with a dispenser.

Further, when the amount of the ultraviolet curable resin applied is small, there is a problem that complete sealing cannot be performed. When the applied amount is too large, the extraction electrode 14 is covered with the resin 13 and connected to the peripheral circuit. The problem that cannot be done occurs.

An object of the present invention is to provide a liquid crystal display panel capable of easily and reliably sealing a liquid crystal injection port and a method of manufacturing the same.

[0009]

In the liquid crystal display panel of the present invention, two substrates on which an alignment film is formed face each other such that the alignment film is inside, and the periphery is sealed with a sealing material. In a liquid crystal display panel in which liquid crystal is sealed inside and a liquid crystal injection port provided in a sealing material is sealed with a sealing resin, a liquid crystal display panel is provided separately from a lead electrode on a peripheral portion on a side facing the substrate. the mask member having an opening is disposed, the liquid crystal inlet is provided in side extraction electrode is provided,
In addition, the mask member is sealed with a sealing resin formed at a position corresponding to the opening.

[0010]

In the method of manufacturing a liquid crystal display panel according to the present invention, at least a liquid crystal is sealed around at least between two opposing substrates, and a liquid crystal injection port provided in the sealing material sealed at the periphery is provided. In the method for manufacturing a liquid crystal display panel sealed with a sealing resin, the liquid crystal injection port is formed on a side of the substrate where a lead electrode is provided, and the liquid crystal injection port is coated with an ultraviolet curable resin, The pair of substrates
It is selectively cured using a mask member having an opening, which is different from the extraction electrode, formed on the facing surface as a mask, and other unnecessary uncured ultraviolet-curable resin is washed and removed. And With this configuration, it is possible to obtain a liquid crystal display panel capable of reliably sealing a liquid crystal injection port and a method for manufacturing the same.

[0012]

In the liquid crystal display panel of the present invention, the liquid crystal injection port 10 is provided at a portion of the transparent electrode 3, 3 'where there is no lead wire 14, so that the resin 13 sealing the liquid crystal injection port becomes transparent electrode 3, 3'. The 3 ′ extraction electrode 14 is not covered.

In the method of manufacturing a liquid crystal display panel according to the present invention, the ultraviolet curable resin 13 for sealing the liquid crystal injection port 10 is cured by selectively irradiating ultraviolet rays only at required portions. There is no need to apply a large amount, and by applying a large amount, the work becomes extremely easy. Further, the resin does not cover the extraction electrode 14 of the transparent electrode.

[0014]

1A and 1B show a main part of an embodiment of the present invention. FIG. 1A is a sectional view taken along line aa of FIG. 1B, and FIG. 1B is a sectional view taken along line bb of FIG. It is sectional drawing. In this embodiment, as shown in the figure, a color filter 1, a top coat layer 2, a stripe-shaped transparent electrode 3 and an upper glass substrate 5 on which an alignment film 4 is formed, and a stripe-shaped transparent electrode 3 6 is opposed to a lower glass substrate 5 'on which an alignment film 4' is formed, with a spacer 6 interposed therebetween, the periphery is sealed with a sealing material 7, and a liquid crystal 8 is sealed therein. The point of the present embodiment is that the liquid crystal injection port 10 opened in the sealing material 7 is provided at a portion of the striped transparent electrode 3 ′ where the extraction electrode 14 is not provided.

In this embodiment constructed as described above, even if the ultraviolet curable resin 13 for sealing the liquid crystal injection port 10 is applied more than necessary, the extraction electrode 14 is separated, so that the upper part thereof cannot be covered. Absent. For this reason, since sealing can be performed using a sufficient resin, reliable sealing can be performed very easily.

FIG. 2 is a view showing a main part of a second embodiment of the liquid crystal display panel of the present invention. In this figure, the same parts as those in FIG. 1 are denoted by the same reference numerals. This embodiment is basically the same as the previous embodiment.
Is provided at a portion of the corner portion of the glass substrate 5 where the extraction electrode 14 is not provided. The effect of the present embodiment thus configured is the same as that of the previous embodiment.

FIGS. 3A and 3B are views for explaining a first embodiment of the method of manufacturing a liquid crystal display panel according to the present invention, wherein FIG. 3A is a sectional view taken along the line aa of FIG. FIG. 4 is a cross-sectional view taken along line bb in FIG. In this embodiment, a color filter 1 and a top coat layer 2 are formed on an upper glass substrate 5.
, A striped transparent electrode 3 and an extraction electrode (not shown) and an alignment film 4 are formed, and a stripe electrode 3 ′ and an extraction electrode 14, a metal film 15, and an alignment film 4 ′ are formed on a lower glass substrate 5 ′. . The metal film 15 is made of Al and provided at a portion where there is no extraction electrode, and a window 16 is opened.

Next, the two glass substrates 5, 5 'are opposed to each other with the orientation film 4, 4' inside, with the spacer 6 interposed therebetween, and the periphery is sealed with a sealing material 7 of epoxy resin. . The seal is provided with a liquid crystal injection port 10 corresponding to the window 16 provided in the metal film 15.

Next, two glass substrates 5, 5 are placed in a vacuum chamber.
After the liquid crystal 8 is injected between 5 ', the liquid crystal adhered around the liquid crystal injection port 10 is wiped off with a gauze or the like, and then the liquid crystal injection port 10 is sufficiently coated with an ultraviolet curing resin 13 for sealing. Next, ultraviolet rays 17 are irradiated from behind the glass substrate 5 'on which the metal film 15 is formed. In this case, the ultraviolet light 17 passes only through the window 16 provided in the metal film 15, and forms a cured resin 13 'in that portion. Next, the entire panel is washed with a solvent, a detergent, water, or the like, and the uncured portion of the ultraviolet curable resin 13 whose ultraviolet rays are blocked by the metal film 15 is removed to complete the sealing of the liquid crystal injection port 10.

FIGS. 4A and 4B show a step of sealing the above-mentioned liquid crystal injection port. FIG. 4A is a plan view, and FIG. In this case, if the resin 13 rides on the glass substrate 5 on the upper part, not only will it hinder the pasting of the polarizing plate, but also there is a risk that it will not be possible to unitize it.
Care must be taken so that the resin 13 does not get on the glass substrate 5. (C) shows a state where ultraviolet rays are irradiated from behind the glass substrate 5 ', and (d) and (e) show a state where the uncured resin is washed and removed.

According to the above embodiment, the ultraviolet rays can be selectively irradiated by the pattern made of the metal film 15, and the other unnecessary ultraviolet curable resin can be removed by washing. The UV curable resin can be applied sufficiently. For this reason, the work becomes easy, and the protrusion to the extraction electrode can be prevented, so that reliable sealing can be achieved.

FIGS. 5A and 5B are views for explaining a second embodiment of the method for manufacturing a liquid crystal display panel according to the present invention, wherein FIG. 5A is a sectional view taken along the line aa of FIG. FIG. 4 is a cross-sectional view taken along line bb in FIG. The manufacturing method of the liquid crystal display panel of this embodiment is basically the same as that of the previous embodiment described with reference to FIG. 3, except that the liquid crystal injection port 10 is provided at the corner of the glass substrate 5 '. is there. According to this embodiment, compared to the previous embodiment, there is no need to provide an injection port between the extraction electrode groups, so there is room in space,
Even more reliable sealing becomes possible.

[0023]

According to the present invention, when the liquid crystal injection port is sealed with an ultraviolet curable resin, it is not necessary to strictly apply the amount of the ultraviolet curable resin, so that the work becomes easy and reliable. Sealing becomes possible.

[Brief description of the drawings]

FIGS. 1A and 1B are views showing a first embodiment of a liquid crystal display panel according to the present invention, wherein FIG. 1A is a cross-sectional view taken along line aa of FIG.
(B) is sectional drawing in the bb line of (a) figure.

FIG. 2 is a view showing a second embodiment of the liquid crystal display panel of the present invention.

3A and 3B are diagrams for explaining the first embodiment of the method for manufacturing a liquid crystal display panel according to the present invention, wherein FIG. 3A is aa of FIG.
FIG. 2B is a cross-sectional view taken along line bb of FIG.

FIG. 4 is a view for explaining a step of sealing a liquid crystal injection port in FIG. 3;

5A and 5B are diagrams for explaining a second embodiment of the method for manufacturing a liquid crystal display panel according to the present invention, wherein FIG. 5A is aa of FIG.
FIG. 2B is a cross-sectional view taken along line bb of FIG.

FIG. 6 is a view showing a conventional color liquid crystal display panel;
3A is a plan view, and FIG. 3B is a cross-sectional view taken along line bb in FIG.

FIG. 7 is a view showing a conventional liquid crystal injection method for a liquid crystal display panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Color filter 2 ... Top coat layer 3, 3 '... Transparent electrode 4, 4' ... Orientation film 5, 5 '... Glass substrate 6 ... Spacer 7 ... Sealing material 8 ... Liquid crystal 10 ... Liquid crystal injection port 13, 13' ... UV curable resin 14 ... Extraction electrode 15 ... Metal film 16 ... Window 17 ... UV

Continuing on the front page (72) Inventor Kunio Furukawa 1015 Uedanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (72) Inventor Tadashi Hasegawa 1015 Uedanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (72) Inventor Yoshiro Koike 1015 Uedanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (56) References JP-A-2-147821 (JP, A) JP-A-59-226323 (JP, A) JP-A-3-3 148636 (JP, A) JP-A-2-62078 (JP, A) JP-A-54-66551 (JP, U)

Claims (2)

(57) [Claims] The two substrates on which an alignment film is formed face each other such that the alignment film is on the inside, the periphery is sealed with a sealing material, liquid crystal is sealed inside, and the substrate is provided on the sealing material. In the liquid crystal display panel in which the liquid crystal injection port is sealed with a sealing resin, a peripheral portion on the side of the opposing surface of the substrate is different from the extraction electrode,
Is disposed mask member having an opening, said liquid crystal Inlet is sealed is provided on a side of the extraction electrode is provided, and a sealing resin formed at a position corresponding to the opening of the mask member A liquid crystal display device characterized by the above-mentioned. 2. A method of manufacturing a liquid crystal display panel, wherein liquid crystal is peripherally sealed at least between two opposing substrates, and a liquid crystal injection port provided in the peripherally sealed sealing material is sealed with a sealing resin. Forming the liquid crystal injection port on the side of the substrate where the extraction electrode is provided; applying an ultraviolet curable resin to the liquid crystal injection port; forming the ultraviolet curable resin on the opposite surface side of the substrate;
A method for manufacturing a liquid crystal display panel, characterized by selectively curing using a mask member having an opening, which is different from the extraction electrode, as a mask, and washing and removing other unnecessary uncured ultraviolet-curable resins. .