JPH05138860A - Film printing device - Google Patents

Abstract

PURPOSE:To eliminate the generation of metal waste refuse and to prevent the damage of a printing plate due to a metal plate in the production of a liquid crystal display device by constitution using no metal plate. CONSTITUTION:A printing material 3 is applied to the upper surface of a transfer flat plate member in predetermined thickness and a printing plate 2 is pressed to the flat plate member to transfer the printing material 3 to the printing plate 2 and the printing plate 2 is pressed to a substrate 7 to transfer the printing material 9 transferred to the printing plate 2 to the substrate 7 to form a printing film 8 on the substrate 7. In this film printing device, the transfer flat plate member is constituted of a glass plate 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a liquid crystal display device, and more particularly to a method for manufacturing a liquid crystal display device in which an alignment film or the like is formed by letterpress printing.

[0002]

2. Description of the Related Art Conventionally, in a method of manufacturing a liquid crystal display device, in a step of forming an alignment material or the like on a substrate in a predetermined pattern, a printing material is stretched on a metal plate and transferred to a printing plate, which is further transferred to a glass substrate. The printing method of transferring on top was used.

FIG. 3 shows a conventional printing method. First, the printing material 3 is dropped on the metal plate 12 and stretched by the doctor bar 11. Next, the printing roller 1 to which the printing plate 2 is attached is pressed while rotating to transfer the printing material 9 onto the printing plate 2. Further, as shown in the figure, this printing material is used for the glass substrate 7
The printed film 8 was formed by transfer onto the upper surface.

[0004]

However, in the above-mentioned prior art, the metal plate must be rubbed when the printing material is stretched on the metal plate, and metal dust is generated, which causes defective cell thickness or short circuit between upper and lower substrates. Was causing

Further, the printing plate is scratched due to the generated metal dust, which causes uneven printing, resulting in an alignment defect, which significantly reduces the yield.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and a liquid crystal display device in which the generation of metal dust is eliminated by the structure without using a metal plate and the printing plate is prevented from being damaged by the metal plate. The purpose is to provide a method.

[0007]

To achieve the above object, in the present invention, for example, a liquid crystal display device having the following structure, that is, two electrode plates and a transparent electrode provided on either or both of the electrodes are used. In a method of manufacturing a liquid crystal display device including an electrode film, a sealing material sandwiched between the two electrode plates, and a liquid crystal sealed in a gap space formed by the electrode plate and the sealing material, an alignment material, etc. The glass plate is used in place of the conventional metal plate used in the printing step.

In the present invention, the printing material is polyimide,
Polyamide, resist, or other insulating film (eg MOF) is preferred.

[0009] Further, as the printing plate material, Cyrel, AP
R and EPT materials are preferable, and the glass plate is preferably a blue plate having a plate thickness of 0.7 to 1.1 mm.

[0010]

In the method of manufacturing the liquid crystal display device of the present invention,
An orientation material or the like is transferred from a glass plate to a printing plate, and this is transferred to a glass substrate for printing. Therefore, it is possible to carry out printing without the inclusion of metallic dust in the printed film and without scratching the printing plate.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a printing method according to an embodiment of the present invention. A printing material 3 having a polyimide solid content of 3.8%, for example, is formed in a predetermined film thickness on a glass plate 4 having a thickness of about 0.7 to 1.1 mm by using a spinner. This is set on the table 5. Next, the printing material 9 is transferred to the printing plate 2 by pressing while rotating the printing roller 1 to which the printing plate 2 made of, for example, a Sirel material is attached. Further, this printing material is transferred onto the glass substrate 7 as shown in the figure to form a printing film 8.

According to this method, the metal plate 1 is conventionally used.
Since 2 is not used, metal dust is not generated due to contact between the printing plate and the metal plate, and therefore metal dust is not mixed in the printing film 8. Further, since the stretching work by the doctor bar 11 is not performed, a good print film without scratches due to the doctor bar and printing unevenness can be obtained.

As the printing plate material, APR or EPT may be used, and as the printing material, polyamide, resist, or other insulating material (MOF) may be used. The glass plate is preferably a blue plate having a plate thickness of 0.7 to 1.1 mm.

FIG. 2 shows another embodiment of the present invention. In this embodiment, a glass plate 10 patterned by etching hydrofluoric acid is used. First, the thickness 0.7-1.1 mm
For example, a printing material 3 having a polyimide solid content of 3.8% is formed in a predetermined film thickness on a glass plate 10 with a spinner. When the glass plate 10 is used as described above, either method may be used because a constant film thickness is maintained even when the printing material 3 is dropped and stretched by the doctor bar 11 instead of coating with a spinner.

Next, the printing material 9 is transferred onto the printing plate 2 by pressing it while rotating the printing roller 1 to which the printing plate 2 made of, for example, a Sirel material is attached. Furthermore, this printing material 9
Is transferred onto the glass substrate 7 as shown in the figure to form the printed film 8.

According to this method, not only the generation of metal dust can be prevented, but also the thickness of the glass plate can be increased depending on the etching depth of the glass plate, and a good thick film without unevenness in the film thickness can be obtained.

In this case, as the printing plate material, APR, E
PT may be used, and the printing material may be polyamide, resist, or other insulating material (MOF, etc.).
The glass plate is preferably a blue plate having a plate thickness of 0.7 to 1.1 mm.

The printing method of each of the above embodiments is effective when used in the step of forming an alignment film of a liquid crystal display device, for example. A liquid crystal display device includes a pair of electrode plates facing each other, a transparent electrode provided on at least one of the electrode plates, a sealing material disposed between the two electrode plates, and a cell space formed by the sealing material. The alignment film is formed on the electrode substrate together with an insulating film and the like.

[0019]

As described above, in the method of manufacturing a liquid crystal display device according to the present invention, a glass plate is used in place of the conventional metal plate to print the alignment film and the like, so that no metal dust is generated. Problems such as defective cell thickness due to metal dust and shorts between upper and lower substrates do not occur. In addition, scratches on the printing plate are prevented, and uneven printing and alignment defects are prevented. Further, since the etching depth accuracy of the glass is high, a good film having no film thickness unevenness and free from dust is formed.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a printing method using a glass plate according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a printing method using an etched glass plate according to another embodiment of the present invention.

FIG. 3 is an explanatory diagram of a conventional printing method using a metal plate.

[Explanation of symbols]

1; printing roller, 2; printing plate, 3; printing material, 4; glass plate, 5; table, 6; stage, 7; glass substrate,
8: printed film, 9: printing material transferred to the plate, 1
0: Etched glass plate.

Claims (2)

[Claims] 1. A printing material having a predetermined thickness is applied to the upper surface of a transfer flat plate member, the printing plate is pressed against the flat plate member to transfer the printing material to the printing plate side, and the printing plate is placed on a substrate. In a thin-film printing apparatus that presses to transfer the printing material transferred onto the printing plate to the substrate side, thereby forming a printing film on the substrate, the transfer flat plate member is formed of a glass plate. A thin film printing device characterized by the above. 2. The thin film printing apparatus according to claim 1, wherein the transfer printing material application portion of the glass plate is provided with a pattern etched to a predetermined depth.