KR20060012766A - Formation method of rubber plate for alignment film formation apparatus - Google Patents

Abstract

Method for producing a rubber plate for an alignment film forming apparatus according to the present invention includes the step of positioning the rubber plate of the EPDM series, the step of mechanical processing on the surface of the rubber plate to form an uneven pattern, the mechanical processing is laser processing, press working or It is preferable that it is any one selected from sputtering. Therefore, the manufacturing method of the rubber plate for orientation film forming apparatus which concerns on this invention has the advantage that the formation of a large sized rubber plate is easy by forming an uneven | corrugated pattern in a rubber plate by mechanical processing, without using an exposure apparatus.

Alignment film, PI, anilox roll, printing roll, rubber sheet, EPDM, resin sheet, laser processing

Description

The manufacturing method of the rubber plate for oriented film forming apparatus {FORMATION METHOD OF RUBBER PLATE FOR ALIGNMENT FILM FORMATION APPARATUS}

1 is a cross-sectional view of the disc of the EPDM-based rubber sheet,

2 is a view showing a state in which a concave-convex pattern is formed by laser processing a rubber plate according to an embodiment of the present invention;

3 is a view showing a state of forming a concave-convex pattern by pressing the rubber plate according to an embodiment of the present invention,

4 is a side cross-sectional view of an alignment film forming apparatus with a rubber plate manufactured by the method for manufacturing a rubber plate for alignment film forming apparatus according to an embodiment of the present invention;

FIG. 5 is a view showing a concave-convex pattern formed on the rubber plate as a state before the rubber plate is attached to the outer circumferential surface of the printing roll;

6 is a view schematically showing a state in which a printing roll with a rubber plate for an alignment film forming apparatus according to an embodiment of the present invention prints an alignment film on a substrate.

This invention relates to the manufacturing method of the rubber plate for orientation film formation apparatuses of a liquid crystal display device.

The liquid crystal display is one of the most widely used flat panel display devices. The liquid crystal display includes two display panels on which a field generating electrode is formed and a liquid crystal layer interposed therebetween. It is a display device which controls the transmittance | permeability of the light which passes through a liquid crystal layer by rearranging.

The manufacturing process of the liquid crystal display device as described above will be briefly described as follows.

First, the lower panel of the two panels forms a plurality of switching devices such as thin film transistors through a plurality of deposition, photolithography, and etching processes, and each switching device ( A pixel corresponding to a switching device is configured in a matrix form, and wirings are intersected around the switching elements, and an array pattern in which pads are formed at one end of each wiring is formed. In addition, a common electrode is formed on a surface of the upper panel facing the lower panel, and a color filter is formed thereon. Next, an alignment film is formed on the upper and lower display panels according to the alignment characteristics of the liquid crystal filled between the upper display panel and the lower display panel. Next, after attaching the upper display panel and the lower display panel with a predetermined adhesive, a liquid crystal panel is completed by filling an arbitrary liquid crystal in the space between the two attached display panels.

The process of forming the alignment layer on the display panel is essential for the following reasons. The liquid crystal display device utilizes the electro-optic effect of the liquid crystal, and this electro-optic effect is determined by the anisotropy of the liquid crystal itself and the molecular arrangement state of the liquid crystal. In addition, the control of the molecular arrangement of the liquid crystal has a great influence on stabilizing the display quality in the liquid crystal display device.

Therefore, it is the role of the alignment film to impart a single crystal order to the liquid crystal and to allow the liquid crystal molecules to perform a regular response in units of one sheet. Such an alignment film is generally formed by a rotary coating method or a printing coating method. Among these, a printing coating device is a method of coating an alignment film on a glass substrate by using a plurality of interlocking rolls. It consists of anilox roll, printing roll and rubber sheet.

However, as the substrate becomes larger, the anilox roll and the printing roll become larger, so that the size and weight of the overall alignment film forming apparatus become larger, resulting in a limitation in manufacturing the equipment.

In addition, since the rubber plate also becomes large, there is a problem that the exposure apparatus also becomes large when the uneven pattern is formed on the rubber plate by performing the exposure process on the conventional photosensitive rubber plate.

The technical problem of this invention is providing the manufacturing method of the rubber plate for orientation film formation apparatuses applicable to a large sized board | substrate.

Method of manufacturing a rubber plate for an alignment film forming apparatus according to the present invention comprises the step of positioning the rubber plate of the EPDM series, forming a concave-convex pattern by performing mechanical processing on the surface of the rubber plate, the mechanical processing is laser processing, press It is preferably any one selected from processing or sputtering.

Moreover, it is preferable that the said uneven | corrugated pattern corresponds to the some liquid crystal display panel pattern formed in the board | substrate.

Moreover, it is preferable that the part corresponding to the said liquid crystal display panel pattern is convexly formed in the said uneven | corrugated pattern.

In the laser processing, it is preferable to form a concave portion of the uneven pattern by irradiating a laser to the rubber plate.

In addition, the press working is preferably pressed into a portion of the rubber plate using a press to form a recessed portion in the rubber plate.

In addition, the alignment film forming apparatus according to the present invention is provided in the lower part of the alignment agent supply unit, the alignment agent supply unit is rotated in contact with the anilox roll receiving the alignment agent from the alignment agent supply unit, one side of the outer peripheral surface of the anilox roll A doctor roll, a printing roll with a rubber plate attached to the outer circumferential surface of the anilox roll, and a substrate mounted on an upper surface thereof, and installed so as to contact the substrate with the rubber plate attached to the printing roll. It is preferable that the uneven | corrugated pattern formed in the said rubber plate is processed and formed by any one selected from a laser processing, a press working, or sputtering, including the table which is provided.

In addition, the rubber sheet is preferably formed of EPDM-based material.

Moreover, it is preferable that the uneven | corrugated pattern of the said rubber plate corresponds to the some liquid crystal display panel pattern formed in the said board | substrate.

Then, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

Now, a method of manufacturing a rubber plate for an alignment film forming apparatus and an alignment film forming apparatus formed using the same according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 is a cross-sectional view of the original plate of the EPDM-based rubber plate, Figure 2 is a view showing a state of forming a concave-convex pattern by laser processing the rubber plate in accordance with an embodiment of the present invention, Figure 3 According to one embodiment of the invention is shown a state of forming a concave-convex pattern by pressing the rubber plate.

As shown in FIG. 1, a rubber plate 70 is manufactured and positioned using EPDM (Ethylene Propylene Terpolymers) -based material.

EPDM is a synthetic rubber consisting of ethylene, propylene, and non-conjugated dienes. In particular, dienes are intended to enable sulfur vulcanization. Such EPDM is excellent in ozone resistance, weather resistance, heat resistance, solvent resistance, low specific gravity compared to other synthetic rubbers, and is a synthetic rubber having excellent economic efficiency due to high filling of fillers and oils. And unlike the photosensitive resin plate which can form an uneven | corrugated pattern on a surface by an exposure process, it is possible to form an uneven | corrugated pattern on a surface by mechanical processing.

Next, as shown in FIG. 2, mechanical processing is performed on the surface of the rubber plate 70 to form the uneven patterns 70a and 70b. Such mechanical processing is preferably any one selected from laser processing, press processing or sputtering.

2 shows laser processing as one embodiment of such mechanical processing.

Laser processing is a process of irradiating the laser plate 101 which the laser generating apparatus 100 produced | generated to the rubber plate 70 to form the recessed part 70b among the uneven | corrugated patterns. In this case, there is an advantage that there is no need for a separate pattern film required for forming the uneven pattern by the exposure process.

The convex portion 70a of the uneven patterns 70a and 70b is formed corresponding to the plurality of liquid crystal display panel patterns 1a formed on the substrate 1 (see FIG. 4). That is, the portions 70a of the uneven patterns 70a and 70b corresponding to the liquid crystal display panel pattern 1a are convex, and the portions 70b corresponding to the plurality of liquid crystal display panels are concave. .

3 shows press working as another embodiment of mechanical processing.

Press work is a process of pressing the part of the rubber plate 70 using the press 200, and forming the recessed part 70b in the rubber plate 70. FIG. In this case, there is an advantage that there is no need for a separate pattern film required for forming the uneven pattern by the exposure process.

Figure 4 is a side cross-sectional view of the alignment film forming apparatus with a rubber plate prepared by the manufacturing method of the rubber plate for alignment film forming apparatus according to an embodiment of the present invention, Figure 5 is a state before the rubber plate is attached to the outer peripheral surface of the printing roll, FIG. 6 is a view illustrating an uneven pattern formed on a rubber plate, and FIG. 6 schematically illustrates a state in which a printing roll with a rubber plate for an alignment film forming apparatus according to an embodiment of the present invention prints an alignment film on a substrate.

As shown in FIG. 4, the alignment film forming apparatus formed by the method of manufacturing a rubber plate for the alignment film forming apparatus according to an embodiment of the present invention includes three rollers arranged in parallel with each other, that is, anilox roll 10 and a doctor roll. It consists of 20, the printing roll 30, and the aligning agent supply part 40, the basket 50, and the table 60. As shown in FIG.

The alignment agent supply part 40 is installed on the top of the anilox roll 10 to flow the alignment agent to the outer circumferential surface of the anilox roll 10, and the doctor roll 20 is not the outer circumferential surface thereof but the outer circumferential surface of the anilox roll 10. It reciprocates in the axial direction in contact with one side of and serves to evenly spread the alignment agent supplied from the alignment agent supply unit 40 on the outer peripheral surface of the anilox roll (10).

Such an aligning agent is divided into an inorganic aligning agent and an organic aligning agent, and polyimide-based aligning agents are used in particular among organic aligning agents.

Arbitrary patterns are formed on the outer circumferential surface of the printing roll 30, and a rubber plate 70 made of EPDM (Ethylene Propylene Terpolymers) is attached.

As shown in FIGS. 4 and 5, the uneven pattern 70a corresponding to the plurality of liquid crystal display panel patterns 1a formed on the substrate 1 is formed on the rubber plate 70.

As shown in FIG. 4, the rubber plate 70 comes into contact with the outer circumferential surface of the anilox roll 10 so that the alignment agent buried in the outer circumferential surface of the anilox roll 10 is transferred to the surface of the rubber plate 70. That is, the doctor roll 20 meshes with the anilox roll 10, and the printing roll 30 is configured to mesh with the anilox roll 10.

4 and 6, the length of the outer circumferential surface, which is? Times the diameter D2 of the printing roll 30, is equal to the length L3 of the substrate.

As shown in FIG. 6, the uneven pattern 70a formed on the rubber plate 70 includes a plurality of liquid crystals on the substrate 1, that is, portions excluding a portion to apply an adhesive, a portion to form a pad, and the like. The alignment film pattern 2 is formed by allowing the alignment agent to be selectively printed on the display pattern 1a.

At this time, the table 60 moves back and forth in the lower part of the printing roll 30, ie, in a direction perpendicular to the rotation axis 31 of the printing roll 30. That is, the board | substrate 1 in which the some liquid crystal display panel pattern 1a is formed is mounted on the upper surface of the table 60. As shown in FIG. While the table 60 mounts the substrate 1 and moves to the bottom of the printing roll 30, the rubber plate 70 coats the alignment agent with the uneven pattern 70a of the rubber plate 70 on the surface of the substrate 1. Thus, the alignment film pattern 2 is formed.

 In addition, the basket 50 installed at the lower portion of the anilox roll 10 collects the extra alignment agent falling from the anilox roll 10 in the process of evenly spreading the alignment agent supplied to the anilox roll 10. Play a role.                     

After completing the formation of the alignment layer, a process of curing the alignment layer formed on the substrate 10 at a predetermined temperature is performed, and a process of rubbing the surface of the cured alignment layer using a rubbing roll is performed to form an alignment layer. Complete

The rubbing process serves to define the alignment angle on the surface of the alignment layer to give the alignment direction to the liquid crystal molecules.

Referring to the alignment film forming method using the alignment film forming apparatus with a rubber plate manufactured by the manufacturing method according to an embodiment of the present invention configured as described above are as follows.

The aligning agent supply part 40 flows the aligning agent to the outer peripheral surface of the anilox roll 10, and the doctor roll 20 reciprocates in the axial direction in contact with one side of the outer peripheral surface of the anilox roll 10 rather than its outer peripheral surface. It is moved and serves to evenly spread the alignment agent supplied from the alignment agent supply unit 40 to the outer peripheral surface of the anilox roll 10.

When the rubber plate 70 attached to the outer circumferential surface of the printing roll 30 is in contact with the outer circumferential surface of the anilox roll 10, the alignment agent on the outer circumferential surface of the anilox roll 10 is transferred to the surface of the rubber plate 70.

And the uneven | corrugated pattern 70a formed in the rubber plate 70 forms an aligning film pattern 2 so that an aligning agent may be selectively printed on the some liquid crystal display pattern 1a.

At this time, the table 60 moves back and forth in the lower part of the printing roll 30, ie, in a direction perpendicular to the rotation axis 31 of the printing roll 30. That is, while the table 60 mounts the board | substrate 1 and moves to the lower part of the printing roll 30, the rubber plate 70 is an aligning agent with the uneven | corrugated pattern 70a of the rubber plate 70 on the surface of the board | substrate 1; Is coated to form the alignment layer pattern (2).

And since the length of the outer peripheral surface which is (pi) times the diameter D2 of the printing roll 30 is the same as the length L3 of the board | substrate, when the printing roll 30 rotates once, all the area | regions of the board | substrate 1, ie, An alignment film is formed in the region corresponding to L3.

 Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Could be. Accordingly, the true scope of protection of the invention should be defined only by the appended claims.

The manufacturing method of the rubber plate for alignment film forming apparatus which concerns on this invention has the advantage that the formation of a large sized rubber plate is easy by forming an uneven | corrugated pattern in a rubber plate by mechanical processing, without using an exposure apparatus.

In addition, by forming a rubber plate of the EPDM-based material used in the doctor roll, mechanical processing is possible, and there is an advantage that it is stable against chemical and mechanical variations.

Claims (8)

Positioning the rubber sheet of EPDM series, Mechanical processing on the surface of the rubber plate to form an uneven pattern Including, The mechanical processing is any one selected from laser processing, press processing or sputtering, a method for producing a rubber plate for an alignment film forming apparatus. In claim 1, The said uneven | corrugated pattern is a manufacturing method of the rubber plate for orientation film formation apparatuses corresponding to the some liquid crystal display panel pattern formed in the board | substrate. In claim 1, The said uneven | corrugated pattern is a manufacturing method of the rubber plate for orientation film forming apparatuss in which the part corresponding to the said liquid crystal display panel pattern is formed convexly. In claim 1, The said laser processing is a manufacturing method of the rubber plate for orientation film forming apparatuss which irradiates a laser to the said rubber plate, and forms the recessed part among the said uneven | corrugated pattern. In claim 1, The said press working is a manufacturing method of the rubber plate for orientation film forming apparatuss which presses a part of said rubber plate using a press and forms a recessed part in the said rubber plate. Alignment agent supply, An anilox roll installed under the alignment agent supply unit and receiving an alignment agent from the alignment agent supply unit, A doctor roll which rotates in contact with one side of an outer circumferential surface of the anilox roll, A printing roll which rotates in contact with the other side of the outer circumferential surface of the anilox roll and has a rubber plate attached to the outer circumferential surface; A substrate is mounted on an upper surface, and includes a table provided to contact the substrate with a rubber plate attached to the printing roll. The uneven pattern formed in the rubber plate is processed by any one selected from laser processing, press processing or sputtering to form an alignment film forming apparatus. In claim 6, The rubber plate is an alignment film forming apparatus is formed of a material of EPDM series. In claim 6, An uneven pattern of the rubber plate corresponds to a plurality of liquid crystal display panel patterns formed on the substrate.

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