JPH0961833A - Liquid crystal display panel and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid display panel improved in the structure near the injection port of liquid crystals with which the simple and easy execution of the improvement of a sealing stage of the injection port by using a photosetting resin for a liquid crystal display panel and more particularly an active matrix type color liquid crystal display panel using TFTs as active elements and its production. SOLUTION: This liquid crystal display panel includes two sheets of substrates 1, 2 which face each other via a sealing material 4 in the peripheral part and via spacers and liquid crystal layer in the central part and transparent electrodes and oriented films on the inside surface of at least one substrate of these substrates 1, 2. The liquid crystal display panel is constituted by packing the photosetting resin in the injection port 4a of the liquid crystals disposed by removing a part of the sealing material 4. The liquid crystal display panel is so constituted as to include a thin film 5 of a silicon compd. on the front surface of the injection port 4a on the inside surface of at least one substrate of the substrates.

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 more particularly to an improvement of a process for sealing an injection port using a photocurable resin of an active matrix type color liquid crystal display panel having a TFT as an active element. .

Liquid crystal display panels have come to be used in a wide variety of products such as small televisions, video camera monitors, notebook computer monitors, and the like, and have been mass-produced by a number of major manufacturers as the market expands. .

Under the circumstances as described above, there has been a demand for an increase in area and cost, and an improvement in production efficiency for the purpose of widespread use.

[0004]

2. Description of the Related Art A conventional liquid crystal display panel will be described in detail with reference to FIG. FIG. 6 is a schematic diagram showing a schematic structure of a liquid crystal display panel.

In the conventional liquid crystal display panel, as shown in FIG. 6, a sealing material 4 is provided in the peripheral portion and a diameter of 4 to 10 μm is provided in the central portion.
oppose each other through a spherical spacer 6 made of resin of m,
CF substrate 2 made of borosilicate glass and film thickness 700-1,000
Alignment film 3 made of polyimide of Å and TFT substrate 1 made of borosilicate glass and alignment film 3 are bonded together by a sealing material 4, and a part of the sealing material 4 is removed to inject a liquid crystal. After filling the liquid crystal 7 from 4a, the injection port 4a is sealed with a photocurable resin 8.

The photocurable resin 8 contains a curing accelerator and an adhesion improver which enhances the adhesion to the substrate.

[0007]

In the conventional liquid crystal display panel described above, the curing accelerator and the adhesion improver remain in the photocurable resin used to seal the injection port without curing. When the uncured components of these curing accelerators and adhesion improvers are dissolved in the liquid crystal as impurities, they contaminate the surface of the alignment film, which causes an obstacle that deteriorates the light transmission characteristics of the liquid crystal display panel, resulting in color unevenness and There is a problem that image sticking appears near the injection port.

In the conventional sealing method, it is difficult to irradiate the photocurable resin with light to cure the resin, and if it is too early, the sealing material 4 and the photocurable resin 8 are separated as shown in FIG. 5 (a). There is a problem that a gap is created between them and air mixes into the liquid crystal display panel, which causes display abnormalities in the image display area 2a. If it is too late, the light will not be emitted as shown in Fig. 5 (b). The curable resin 8 is the image display area behind the liquid crystal display panel.
There was a problem in that the display error occurred in the shaded area after reaching 2a.

In view of the above circumstances, the present invention has an object to provide a liquid crystal display panel having a structure near the liquid crystal injection port which can be easily and easily implemented, and a manufacturing method thereof.

[0010]

A liquid crystal display panel of the present invention includes a sealing material in a peripheral portion, two substrates facing each other with a spacer and a liquid crystal layer in a central portion, and at least one of the substrates. A liquid crystal display panel having a transparent electrode and an alignment film on its inner surface, and a photocurable resin filled in a liquid crystal injection port provided by removing a part of the sealing material,
A silicon compound thin film is provided on the inner surface of at least one of the substrates at the injection port.

According to the method of manufacturing a liquid crystal display panel of the present invention, a liquid photocurable resin containing no organic silicon compound used as an adhesion improving agent is injected into this injection port of the liquid crystal display panel having the above-mentioned structure. In addition, the thin film of the above-mentioned silicon compound and the insulating film made of the silicon compound which forms the semiconductor element formed in the liquid crystal display panel having the above-mentioned structure are formed at the same time. .

That is, in the present invention, since the thin film of the silicon compound is formed on the inner surface of the substrate in the region where the photocurable resin is formed in the vicinity of the injection port, the photocurable resin containing no adhesion improving agent is used. However, the adhesion in the vicinity of the injection port does not deteriorate, and at the same time, it becomes possible to prevent the contamination of the alignment film surface.

Further, since the photo-curable resin containing no adhesion improving agent is used, the adhesiveness between the photo-curable resin and the TFT substrate or the CF substrate is high in the region other than the region where the silicon compound thin film is formed. Penetration rate decreases because it is not good. For this reason, the tolerance of the timing of light irradiation is widened, and the sealing step using the photocurable resin can be easily performed.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to FIGS. 1 is a perspective view showing details of the vicinity of a liquid crystal injection port according to an embodiment of the present invention, FIG. 2 is a side sectional view showing a method for manufacturing a liquid crystal display panel according to the first embodiment of the present invention, and FIG. FIG. 4 is a side sectional view showing a method for manufacturing a liquid crystal display panel according to a second embodiment of the present invention, and FIG. 4 is a side sectional view showing a method for manufacturing a liquid crystal display panel according to the third embodiment of the present invention.

In the liquid crystal display panel of one embodiment according to the present invention, as shown in FIG. 1, a TFT substrate 1 and a CF substrate 2 are provided.
Are adhered via the seal material 4, a part of the seal material 4 is removed to provide a liquid crystal injection port 4a, and the surfaces of the TFT substrate 1 and the CF substrate 2 at the injection material 4a of the seal material 4 A thin film 5 of a silicon compound is formed.

Even if a photo-curable resin containing no adhesion improving agent is injected from the injection port 4a of such a liquid crystal display panel, the thin film 5 of the silicon compound is formed, and therefore the injection port is formed.
Adhesion in 4a is good, and adhesion to the part where the silicon compound thin film 5 is not formed is not good, so even if the timing of UV irradiation is delayed, as shown in Fig. 5 (b). The photo-curable resin 8 does not reach the image display area 2a.

Therefore, the uncured component of the adhesion improver that remains in the photocurable resin 8 without being cured dissolves into the liquid crystal as an impurity and contaminates the surface of the alignment film 3 to prevent the liquid crystal display panel of the liquid crystal display panel. It is possible to prevent an obstacle that deteriorates the light transmission characteristics from occurring and prevent uneven color and image sticking from appearing in the vicinity of the injection port.

A method of manufacturing the liquid crystal display panel of the first embodiment according to the present invention will be described in detail with reference to FIG. This manufacturing method, as shown in FIG. 2, is a gate insulating film of an inorganic silicon compound (SiO ₂ , SiN ₂ etc.) having a thickness of about 500 Å and a source 9 and a drain 10 formed in an element forming region in a liquid crystal display panel. 11
A gate insulating film 11 which constitutes a semiconductor element composed of a gate electrode 12 and a thin film 5 of a silicon compound of an inorganic silicon compound (SiO ₂ , SiN ₂ etc.) having a film thickness of about 500 Å which is formed in the injection port are simultaneously TFT. This is a manufacturing method of forming on the substrate 1.

By using a mask in which the pattern of the silicon compound thin film 5 is added to the mask for forming the gate insulating film 11, it is possible to carry out the process without increasing the number of steps.

A method of manufacturing the liquid crystal display panel of the second embodiment according to the present invention will be described in detail with reference to FIG. As shown in FIG. 3, this manufacturing method is a manufacturing method in which a thin film 5 of an organic silicon compound is formed on the surface of the TFT substrate 1 by using a plate cylinder 13 having a printing portion 13a. The thin film 5 of an organic silicon compound formed on the printing portion 13a of the plate cylinder 13 is transferred onto the TFT substrate 1 by the relief printing method.

A method of manufacturing the liquid crystal display panel of the third embodiment according to the present invention will be described in detail with reference to FIG. As shown in FIG. 4, this manufacturing method places an organic silicon compound solution on a silk screen 15 having a pattern of a silicon compound thin film to be formed, which is stretched around a frame 14.
In this manufacturing method, a silicon compound thin film 5 is formed on a TFT substrate 1 using a squeegee 16.

In this way, the thin film 5 of the silicon compound is formed on the TFT substrate 1, the liquid crystal is injected into the liquid crystal display panel through the injection port, and the photocurable resin containing no adhesion improving agent is injected into the injection port. Then, even if the timing of irradiation of the photo-curable resin with ultraviolet rays is slightly delayed, the photo-curable resin 8 reaches the image display area 2a at the back of the liquid crystal display panel and an image display abnormality occurs. It becomes possible to prevent it.

[0023]

As is apparent from the above description, according to the present invention, it is possible to prevent color unevenness and image sticking which occur in the vicinity of the injection port by a very simple structure change, and to perform sealing work. The liquid crystal display that has the advantage of being able to expect the improvement of work quality by reducing the influence of the delay of the ultraviolet irradiation timing to the photocurable resin in the above, and the effect of remarkable economic and reliability improvement It is possible to provide a panel and a manufacturing method thereof.

[Brief description of drawings]

FIG. 1 is a perspective view showing details in the vicinity of a liquid crystal injection port according to an embodiment of the present invention.

FIG. 2 is a side sectional view showing a method of manufacturing the liquid crystal display panel of the first embodiment according to the present invention.

FIG. 3 is a side sectional view showing a method of manufacturing a liquid crystal display panel according to a second embodiment of the present invention.

FIG. 4 is a side sectional view showing a method of manufacturing a liquid crystal display panel according to a third embodiment of the present invention.

FIG. 5 is a schematic diagram showing the problems of the conventional technology.

FIG. 6 is a schematic diagram showing a schematic structure of a liquid crystal display panel.

[Explanation of symbols]

 1 TFT substrate 2 CF substrate 2a Display area 3 Alignment film 4 Sealing material 4a Injection port 5 Silicon compound thin film 6 Spacer 7 Liquid crystal 8 Photocurable resin 9 Source 10 Drain 11 Gate insulating film 12 Gate electrode 13 Plate cylinder 13a Printing part 14 frame 15 silk screen 16 squeegee

Claims (3)

[Claims] 1. A sealant is provided in a peripheral portion, two substrates facing each other with a spacer and a liquid crystal layer in a central portion, and a transparent electrode and an alignment film are provided on an inner surface of at least one of the substrates, In a liquid crystal display panel in which a liquid crystal injection port provided by removing a part of the sealing material is filled with a photo-curable resin, a silicon compound is formed on the inner surface of at least one of the substrates of the injection port. A liquid crystal display panel, comprising: 2. A liquid photocurable resin containing no organosilicon compound used as an adhesion improver is injected into the injection port of the liquid crystal display panel having the structure according to claim 1. Liquid crystal display panel manufacturing method. 3. A thin film of the silicon compound according to claim 1,
A method of manufacturing a liquid crystal display panel, which comprises simultaneously forming an insulating film made of a silicon compound which constitutes a semiconductor element formed in the liquid crystal display panel having the structure according to claim 1.