CN214174784U - Coating device for liquid crystal alignment layer - Google Patents

Abstract

The utility model discloses a coating device of a liquid crystal alignment layer, which is used for coating the alignment layer on a substrate and comprises a first rotating wheel and a second rotating wheel, wherein the surface of the first rotating wheel is coated with an alignment film material, and the second rotating wheel is positioned on one side of the first rotating wheel; the surface of the second rotating wheel is provided with a printing relief plate, and the first rotating wheel is in contact with the printing relief plate to adhere the alignment film material to the printing relief plate; the coating device further includes a visual marker disposed at the second wheel. The surface of the printing relief plate can be partitioned by arranging the visual mark. After the abnormity occurs, the specific abnormal position on the surface of the printing relief printing plate can be quickly and accurately positioned by the visual mark, and the corresponding position is only needed to be wiped after the position is found, so that not only can the time be saved, but also other defects caused by the overlarge wiping range can be prevented.

Description

Coating device for liquid crystal alignment layer

Technical Field

The utility model relates to a TFT-LCD technical field especially relates to a coating unit on liquid crystal alignment layer.

Background

In the current LCD production process, a mask is used to perform an exposure process on the RGB color filter layer, and in the conventional RGB mask, a light-transmitting region is formed on a light-shielding layer on a mask substrate, so as to obtain a light-transmitting region corresponding to the RGB color filter layer pattern.

TFT-LCD products have an Alignment layer (Alignment Film) on the inner side of the upper and lower electrode substrates, respectively, for controlling the Alignment direction of liquid crystal molecules. The material of the alignment layer is mainly Polyimide (PI) resin, and thus the alignment layer is also called PI layer.

Currently, the TFT-LCD industry mainly comprises two ways of providing alignment layers to substrates, including

A printing type and a discharge type. In the medium and small size industry, printing (Coater) is still commonly used. The Printing type is mainly characterized in that the alignment film material is uniformly sprayed on a scraper, the scraper is tightly contacted with an A wheel (Anilox Roll) which is fully distributed with a groove, the alignment film material on the scraper is transferred into the groove of the A wheel, and then transferred into a Printing relief plate through the contact between the Printing relief plate on a P wheel (Printing Roll) and the A wheel, finally the Printing relief plate is contacted with a substrate, the alignment film material is uniformly attached to the substrate, and the thickness and the uniformity of the alignment film material are more guaranteed.

Due to repeated printability, the printing relief printing plate is contaminated with foreign matters in the printing process, so that the substrate is poor, in this case, the printing relief printing plate needs to be wiped, the average time of wiping is more than 30min, and serious capacity loss is caused.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a coating unit on liquid crystal alignment layer can effectively shorten exception handling time, improves the productivity.

The application provides a coating device of a liquid crystal alignment layer, which is used for coating the alignment layer on a substrate and comprises a first rotating wheel and a second rotating wheel, wherein the surface of the first rotating wheel is coated with an alignment film material, and the second rotating wheel is positioned on one side of the first rotating wheel; the surface of the second rotating wheel is provided with a printing relief plate, and the first rotating wheel is in contact with the printing relief plate to adhere the alignment film material to the printing relief plate;

the coating device further includes a visual marker disposed at the second wheel.

Preferably, the visual marker comprises: a first marking for zonal identification of the axial direction of the printing relief and a second marking for zonal identification of the radial direction of the second wheel.

Preferably, the first marks are arranged in equal parts; the second marks are arranged in equal parts.

Preferably, the second mark is provided on an end face of the second wheel.

Preferably, an auxiliary member is disposed at the second rotating wheel, and the first mark is disposed on the auxiliary member.

Preferably, the auxiliary member is an outer frame, and the outer frame is connected with a rotating shaft of the second rotating wheel.

Preferably, the outer frame is provided with an escape hole at a position corresponding to the first rotating wheel and the base plate.

Preferably, the visual label is a dust-free visual label.

Preferably, the coating device further comprises an AOI optical detection device, wherein the AOI optical detection device comprises an image acquisition device and an image processing device;

the image acquisition device is used for acquiring an image comprising foreign matters and visual marks on the printing relief printing plate, and the image processing device is used for finding the positions of the foreign matters according to the image.

Preferably, the coating device further comprises a disperser and a scraper, the disperser disperses the alignment film material on the surface of the first rotating wheel, and the scraper uniformly coats the alignment film material on the surface of the first rotating wheel.

Compared with the prior art, the utility model discloses beneficial effect as follows:

the application provides a coating device of liquid crystal alignment layer, thereby can carry out the subregion with the surface of printing relief printing through setting up visual mark. After the abnormity occurs, the specific abnormal position on the surface of the printing relief printing plate can be quickly and accurately positioned by the visual mark, and the corresponding position is only needed to be wiped after the position is found, so that not only can the time be saved, but also other defects caused by the overlarge wiping range can be prevented.

Drawings

FIG. 1 is a schematic view of an apparatus for applying a liquid crystal alignment layer according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of a part of a coating apparatus for a liquid crystal alignment layer according to an embodiment of the present disclosure;

fig. 3 is a cross-sectional view taken at a-a in fig. 2.

Reference numerals:

the printing machine comprises a first rotating wheel (1), a second rotating wheel (2), a printing relief printing plate (3), a disperser (4), a scraper (5), a base table (6), a substrate (7), an auxiliary piece (8), a first mark (9), a second mark (10) and foreign matters (11).

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example one

Please refer to fig. 1-3, which illustrate an apparatus for coating a liquid crystal alignment layer according to an embodiment of the present invention. The coating device is used for coating the alignment layer on the substrate (7).

As shown in fig. 1, the coating apparatus includes a first wheel (1) and a second wheel (2). Wherein, the surface of the first rotating wheel (1) is coated with an alignment film material. The first rotating wheel (1) is an A wheel (Anilox Roll). The first rotating wheel (1) can be made of metal materials or ceramic materials, the first rotating wheel (1) is used for transferring alignment film materials, the surface of the first rotating wheel is formed by micro convex points, and grooves among the convex points can bear the alignment film materials. The alignment film material is, for example, PI liquid.

The second rotating wheel (2) is positioned on one side of the first rotating wheel (1), and a printing relief plate (3) is arranged on the surface of the second rotating wheel (2). The second rotating wheel (2) is a P wheel (Printing Roll), the second rotating wheel (2) is made of stainless steel materials for example, and the second rotating wheel (2) is used for bearing the Printing relief Printing plate (3) so that the Printing relief Printing plate (3) is completely attached to the surface of the second rotating wheel (2). The printing relief (3) rotates with the second wheel (2), the printing relief (3) being for example an APR plate.

In the coating process, the first rotating wheel (1) adheres the alignment film material to the printing relief plate (3) by contacting with the printing relief plate (3).

The coating device of the embodiment of the application also comprises a visual mark arranged at the second rotating wheel (2), and the visual mark is used for partitioning the cylindrical surface of the printing relief plate (3). Specifically, the visual marker includes: a first mark (9) for identifying the axial direction of the printing relief plate (3) in a partitioned manner, and a second mark (10) for identifying the end face circle of the printing relief plate (3) in a partitioned manner.

Preferably, the first marks (9) are arranged in equal parts for equally dividing the axial direction of the printing relief (3). The second marks (10) are equally spaced for equally dividing the end face circle of the printing relief plate (3), it being understood that the printing relief plate (3) does not completely cover the surface of the second wheel (2) and therefore the end face circle of the printing relief plate (3) is not a complete circle.

In order to achieve the above object, the axial and end-face circular shape of the printing relief (3) can be identified in sections in various ways. Preferably, as shown in fig. 3, the second mark (10) is provided on an end surface of the second reel (2). The second mark (10) is preferably arranged on the end face of the second wheel (2) close to the outer circular contour.

In the embodiment of the application, as shown in fig. 2, an auxiliary member (8) is arranged at the second rotating wheel (2), and the first mark (9) is arranged on the auxiliary member (8). The first marking (9) is preferably positioned close to the printing relief (3) in order to identify the axial length of the printing relief (3) in sections by the first marking (9).

It can be understood that the first mark (9) and the second mark (10) in fig. 2 and fig. 3 of the embodiment of the present application are only schematic representations. In practical application, the device can be adjusted according to the actual situation.

The relative position of the auxiliary member (8) and the second rotating wheel (2) is fixed. Preferably, the auxiliary member (8) is a frame, and the frame is connected with a rotating shaft of the second rotating wheel (2), so that the relative position of the auxiliary member (8) and the second rotating wheel (2) is fixed. More specifically, the casing is provided with escape holes at positions corresponding to said first wheel (1) and the substrate (7) so as not to interfere with the contact of the printing relief (3) with the first wheel (1) and with the substrate (7).

The first mark (9) and the second mark (10) of the visual mark are dust-free visual labels.

In the embodiment of the application, the first mark (9) and the second mark (10) are respectively arranged in two directions, so that the surface of the printing relief plate (3) can be divided into a plurality of blocks with equal size in a virtual horizontal and vertical mode.

The coating device of the embodiment of the application further comprises AOI optical detection equipment, and the AOI optical detection equipment is used for automatically finding out the position where the abnormality occurs on the substrate (7). Specifically, the AOI optical detection equipment comprises an image acquisition device and an image processing device. Wherein the image acquisition device is used for acquiring an image of the substrate (7), and then the image processing device is used for finding the AOI coordinates of the abnormal position according to the image. The image capturing device is, for example, a high-definition CCD camera. The image processing apparatus includes image processing hardware and image processing software.

And then, according to the AOI coordinate and the square corresponding relation, the position of the square corresponding to the foreign matter (11) can be quickly found, and the positions of the first mark (9) and the second mark (10) corresponding to the square can be accurately and quickly positioned.

After the position of the foreign matter (11) is found, only the corresponding square position needs to be wiped, so that not only can the time be saved, but also other defects caused by overlarge wiping range can be prevented.

The coating device also comprises an automatic processing system, and a memory and conversion program software are arranged in the automatic processing system. The AOI coordinates and the square corresponding relation are stored in an automatic processing system in advance. By inputting AOI coordinates into the software, the software automatically converts to the corresponding square position, matches with the visual label and quickly processes the abnormity.

The coating device of the embodiment of the application further comprises a disperser (4) and a scraper (5). The disperser (4) disperses the alignment film material to the surface of the first rotating wheel (1), and the scraper (5) is used for uniformly coating the alignment film material on the surface of the first rotating wheel (1). The coating device of the embodiment of the application further comprises a coating base table (6), and the coating base table (6) is used for bearing the substrate (7).

Compared with the prior art, the utility model discloses beneficial effect as follows:

the application provides a coating device of liquid crystal alignment layer, thereby can carry out the subregion with the surface of printing relief printing through setting up visual mark. After the abnormity occurs, the specific abnormal position on the surface of the printing relief printing plate can be quickly and accurately positioned by the visual mark, and the corresponding position is only needed to be wiped after the position is found, so that not only can the time be saved, but also other defects caused by the overlarge wiping range can be prevented.

It will be understood that modifications and variations can be made by those skilled in the art in light of the above teachings, and all such modifications and variations are intended to be included within the scope of the appended claims.

Claims (10)

1. A coating device of a liquid crystal alignment layer is used for coating the alignment layer on a substrate and comprises a first rotating wheel and a second rotating wheel, wherein the surface of the first rotating wheel is coated with an alignment film material, and the second rotating wheel is positioned on one side of the first rotating wheel; the surface of the second rotating wheel is provided with a printing relief plate, and the first rotating wheel is in contact with the printing relief plate to adhere the alignment film material to the printing relief plate; characterized in that the coating device further comprises a visual marker arranged at the second wheel.

2. The coating apparatus of claim 1, wherein the visual marker comprises: the first mark is used for carrying out subarea marking on the axial direction of the printing relief printing plate, and the second mark is used for carrying out subarea marking on the end surface circle of the printing relief printing plate.

3. The coating apparatus of claim 2, wherein said first indicia are equally spaced; the second marks are arranged in equal parts.

4. A coating apparatus as in claim 2, wherein said second indicia are provided on an end face of the second wheel.

5. The coating apparatus of claim 2 wherein an auxiliary is disposed at the second wheel, the first indicia being disposed on the auxiliary.

6. The coating apparatus as claimed in claim 5, wherein the auxiliary member is an outer frame, and the outer frame is connected to a rotating shaft of the second rotating wheel.

7. The coating apparatus as claimed in claim 6, wherein the outer frame is provided with escape holes at positions corresponding to the first turning wheel and the base plate.

8. Coating device according to claim 1, characterized in that said visual marking is a dust-free visual label.

9. The coating apparatus of claim 8, further comprising an AOI optical inspection device comprising an image acquisition device and an image processing device;

the image acquisition device is used for acquiring an image comprising foreign matters and visual marks on the printing relief printing plate, and the image processing device is used for finding the positions of the foreign matters according to the image.

10. The coating apparatus according to claim 1, further comprising a dispenser for dispensing the alignment film material on the surface of the first wheel and a scraper for uniformly coating the alignment film material on the surface of the first wheel.

Images