JPH0850290A - Adhering method of polarizing plate and device therefor - Google Patents

Abstract

PURPOSE:To provide an adhering method of a polarizing plate and a device therefor to increase a quality and productivity in a production process of a liquid crystal display panel by automating the adhering process of a polarizing plate. CONSTITUTION:This device is equipped with a panel holding mechanism 10 which holds a panel main body 12 and moves to a specified adhering position, a cleaning roller 20 which automatically cleans the one face of the panel main body 12 in a standby state to remove foreign matters, an adhering mechanism 30, and a pressing roller 22. In the adhering mechanism 30, a polarizing plate 40 is carried while it is adhered and held with the release film 41 of the plate 40 down on the upper adhesive surface of an adhesive belt 35 which circulates to the adhering position. In the adhering position, movement of the belt is controlled so that the release film 41 is peeled by the adhesive belt 35 from the polarizing plate 40. Movement of the polarizing plate 40 carried by the adhesive belt 35 to the adhering position is then controlled by the pressing roller 22, while the polarizing plate 40 during peeled is pressed from the peeling part to the panel main body 12 to adhere the plate 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sticking method and a device for sticking a polarizing plate to a panel body by peeling a release film at a stage of manufacturing a liquid crystal display panel including a liquid crystal cell or the like.

[0002]

2. Description of the Related Art Generally, a liquid crystal display panel (hereinafter, simply referred to as a panel) has a structure in which a liquid crystal cell is formed by providing a space between two glass substrates, and liquid crystal is sealed in the space. It has a configuration in which a polarizing plate is provided on the outside. Commercially available polarizing plates are usually in the form of a film, and a protective film is coated on the outer surface of a polarizing film that mainly polarizes light, an adhesive is applied on the inner surface, and a release film is attached to the adhesive surface of the adhesive. It is a laminated board. In a mass production line of liquid crystal display devices, the release film of the polarizing plate is peeled off in advance to expose the adhesive surface of the adhesive, and then the polarizing plate is placed by sticking the adhesive surface to the glass substrate on the outer surface side. The process is included. 4 to 6 show an example of a pasting method and device for a polarizing plate which has been conventionally used. The apparatus mainly includes a panel receiving mechanism portion 1 that carries a panel body 2 and stands by, and a sticking mechanism portion 3 that carries a polarizing plate 4 and stands by. After the release film 5 is peeled from the polarizing plate 4 in advance, the adhesive layer 4a is formed on the surface from which the release film 5 is peeled off, by the linked drive of the mechanical parts 1 and 3.
The polarizing plate 4 that has become the panel body 2 (of the glass substrate)
Affix to. Specifically, as shown in FIG. 4, in the panel receiving mechanism unit 1, the adhesive roller 7 is brought into contact with one surface of the panel body 2 positioned and set on the table 6 for cleaning. The cleaning operation by the adhesive roller 7 is performed by the hand of a person who is arranged on the line. On the other hand, in the sticking mechanism section 3, the release film 5 is positioned on the table 8.
The release film 5 is peeled off from the polarizing plate 4 set with the side surface facing up, and is put on standby in preparation for the sticking operation. The peeling operation of the release film 5 is also performed manually.
Upon completion of such preparation, the entire sticking mechanism section 3 is turned upside down toward the panel receiving mechanism section 1 via the rotation fulcrum.
When the sticking mechanism unit 3 is inverted together with the table 8 while the polarizing plate 4 is held, the end of the adhesive layer 4a of the inverted polarizing plate 4 is the end of the panel body 2 on the panel receiving mechanism unit 1 as shown in FIG. Contact the department. In this state, the pressing roller 9 provided on the sticking mechanism section 3 side moves in a direction in which the end of the adhesive layer 4a of the polarizing plate 4 is pressed against the end of the panel body 2, and the panel receiving is synchronized with this. The entire mechanical unit 1 moves to the left in the figure. Then, as shown in FIG. 6, by the coordinated operation of the pressing movement by the pressing roller 9 and the movement of the panel receiving mechanism 1, the polarizing plate 4 is peeled off from the table 8 holding it, and the adhesive layer 4a is used. It is attached to the panel body 2 on one surface side. After that, the sticking mechanism section 3 is reversed in the original direction and returned to the position of FIG.

[0003]

By the way, in such a conventional polarizing plate attaching method and device, as described above, one side of the panel body 2 is cleaned by the adhesive roller 7 at the preparation stage, and the polarizing plate 4 is used. All the work of peeling the release film 5 from is performed manually. for that reason,
The production efficiency at the time of mass production is low, and dust or foreign matter is generated from the human body or the like during work, and these easily adhere to the adhesive layer 4a of the polarizing plate 4 from which the release film 5 is peeled off. By sticking after exposing all 4a or having the exposed adhesive layer 4a on the surface, dust or the like can be prevented.
It adheres to a and deteriorates the quality, resulting in a high yield and a high cost. Therefore, it is an object of the present invention to provide a polarizing plate laminating method and an apparatus for laminating a polarizing plate, which can improve quality and productivity by automating the polarizing plate laminating process in a liquid crystal display depanel manufacturing process. .

[0004]

In order to achieve this object, in the pasting method according to the invention of claim 1, on the one hand, the panel body of the liquid crystal display panel is set, and on the other hand, the polarizing plate can be peeled by an adhesive layer. Set with the release film attached to the bottom side, move the polarizing plate toward the specified attachment position, peel off the release film at the attachment position, and polarize with the adhesive layer from the peeled part. Stick the plate by pressing it against the panel body. In addition, claim 2
As described above, the sticking device of the present invention sticks the polarizing plate on one side of the panel body of the liquid crystal display panel, and holds the panel body on the table with one side facing up at a predetermined sticking position. It has a panel receiving mechanism that moves up to and a feed belt that rotates toward the attachment position.This feed belt adheres the release film to the polarizing plate with the release film attached to the upper adhesive surface of the release film. By carrying it, it is carried, and the release mechanism moves the polarizing mechanism that has been conveyed to the attaching position by the feeding belt, and the releasing mechanism peels the release film from the polarizing plate whose movement is restricted at the attaching position. And a pressing unit that regulates the polarizing plate during release of the release film and presses and attaches the release film downward to the panel body.

[0005]

In the sticking method according to the first aspect, the polarizing plate is set with the release film joined by the adhesive layer facing down.
At the attachment position, the release film is peeled off, and the polarizing plate is attached while pressing the polarizing plate against the panel body with the adhesive layer from the peeled part. During the peeling of the release film, the pressure-sensitive adhesive layer of the polarizing plate faces downward, and the contact time with the working environment is short, so that the adhesion of foreign matter is minimized. Further, in the pasting device according to claim 2, the movement of the polarizing plate conveyed to the pasting position by the feed belt is restricted by the pressing means, and the polarizing plate being peeled of the release film is moved from the peeling portion to the panel body. Press down. In peeling the release film, the release film is adhered to the adhesive surface of the feed belt, and the adhesive force is used to automatically peel the release film by moving the feed belt.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for sticking a polarizing plate and an apparatus therefor according to the present invention will be described below with reference to the drawings. As shown in FIG. 1, a main part of the apparatus according to the embodiment is a panel receiving mechanism part 1 for holding a panel body 12 with one surface side up on a table 11 and moving to a predetermined attaching position.
0, a cleaning means 20 (21) formed of an adhesive roller for automatically cleaning the one surface side of the panel main body 12 which is held on the panel receiving mechanism portion 10 and is on standby, and the feed belt 35 which rotates toward the attaching position. The feeding belt 35 has adhesiveness on one side, and the polarizing plate 40 is attached to the release film 4
1 is attached to the adhesive surface, and the adhesive film is carried while being carried, and the release film 41 is peeled off from the polarizing plate 40 whose movement is restricted at the attaching position by the feed belt 35. The belt 35 includes a pressing means 22 for restricting the movement of the polarizing plate 40 conveyed to the pasting position, and for pushing the polarizing plate 40 during peeling of the release film against the panel body 12 from the peeling portion to stick it. .

In FIG. 1, a panel receiving mechanism portion 10 is provided as one of the main parts of the apparatus, and here the left and right sides of the drawing are reciprocated in the horizontal direction (A, D) (from the original position to the bonding position). There is a table 11 which is capable of (between distances). On the table 11, one panel body 12 of the pasting target is positioned and carried. The panel body 12 referred to here is a liquid crystal cell having a liquid crystal-filled space between two glass substrates. Further, foreign matter cleaning rollers 20 and 21 of the automatic cleaning means according to the present invention are arranged near the table 11 in the original position, and the operation thereof is automatically controlled while rotating the upper surface of the panel body 12 which is the sticking surface. It is possible to remove dust or foreign matter attached to the upper surface by adhering it.

Further, a sticking mechanism section 30 is provided as one of the main parts of the apparatus, in which an unwinding side roller 31 and a winding side roller 32 are rotatably supported, respectively.
A plurality of intermediate tension rollers 33, 3 are provided between 1, 32.
4 are arranged. An adhesive belt 35 made of, for example, a cellophane tape or the like is wound between these rollers as a feed belt in the present invention so as to be rotatable in directions B and C indicated by arrows. One surface of the adhesive belt 35 is formed as an adhesive surface, and the polarizing plate 40 is held on this adhesive surface (the release film 41 before peeling is placed on the lower side to adhere to the adhesive surface) to a predetermined attachment position. It is designed to be transported. In addition, a wedge-shaped guide member 36 having a size capable of holding the polarizing plate 40 and also having a role of applying tension to the belt is arranged at an appropriate position of the wound adhesive belt 35. At the tip of the guide member 36, in order to guide the smooth rotation of the adhesive belt 35, a guide roller 37 like a pinch roller is provided.
Etc. are rotatably rotatably supported, and the adhesive belt 35 has an adhesive surface downward with the guide roller 37 as an axis, and changes its traveling direction from arrow direction B to arrow direction C.

The polarizing plate 40 attached to the panel body 12 has a function of linearly or elliptically polarizing the incident light, has flexibility with respect to external stress, and is appropriately bent. In general, the release film 41, which is generally peeled and removed at the time of use, is attached to the adhesive layer 42 (see FIG. 2 and below) and is the adhesive surface of the adhesive belt 35 at the corresponding position on the guide member 36. It is designed to be set on the top surface. The polarizing plate 40 is set such that the release film 41 before peeling is on the lower side, that is, the adhesive layer 42 is on the lower side, and the release film 41 is adhered to the upper surface of the adhesive belt 35.

Further, the panel receiving mechanism portion 10 as described above.
A pressing roller 22 which is the pressing means according to the present invention is arranged at a substantially intermediate position between the sticking mechanism section 30 and the sticking mechanism section 30. The position where the pressing roller 22 is arranged can be on the “predetermined pasting position” described so far. The pressing roller 22 can be moved up and down, left and right and finely moved from the original position shown in FIG. 1 to the vertical position shown in FIGS. As will be described below, the role of the pressing roller 22 has a function of pressing the polarizing plate 40 to the panel body 12 and adhering it to the panel body 12 and the polarizing plate 40 that have moved to the attaching position.

Next, a sticking method using the sticking apparatus having the above-mentioned structure and its operation will be described. As shown in FIG. 1, in the panel receiving mechanism section 10, the panel body 1 is placed on the table 11.
2 is set with its pasting surface up. Panel body 1
It is well known that the sticking surface of the second polarizing plate 40 is not only on one surface side but also on the other surface side. When the completion of positioning of the panel body 12 is detected, it is sent to the foreign matter cleaning rollers 20, 21 by an operation signal from the control device. The foreign matter cleaning rollers 20 and 21 cooperate with each other while rotating and moving to adhere and remove dust and foreign matter attached to the upper surface of the panel body 12. After the cleaning is completed, the table 11 advances toward the attaching mechanism unit 30 in the arrow direction A to a predetermined attaching position under the control based on the temporal or operational detection.

As shown in FIG. 2, when the table 11 of the panel receiving mechanism section 10 reaches a predetermined position, in synchronization with this, the sticking mechanism section 30 responds to the operation signal by an unwinding side roller 3.
1 and the winding-side roller 32 rotate, respectively, and the adhesive belt 35 is paid out and rotated in the directions of arrows B and C. Along with this, the polarizing plate 40 that is adhesively held on the adhesive surface of the adhesive belt 35 is guided by the wedge-shaped guide member 36 with the adhesive layer 42 facing downward, and on the table 11 on the panel receiving mechanism 10 side. The vehicle diagonally moves toward the panel body 12 waiting at. The timing of the operation during this period is measured, and the pressing roller 22 starts moving toward the leading end of the moving polarizing plate 40 at an appropriate time.

The pressing roller 22 has moved the polarizing plate 40.
The front end of the polarizing plate 40 is pressed in the direction E, and the movement of the polarizing plate 40 is restricted. In the release film 41 attached to the adhesive belt 35, the adhesive belt 35 is the guide roller 3
7 is the axis and the direction of travel is from arrow direction B to arrow direction C
Even if it changes to, it still sticks. On the other hand, since the polarizing plate 40 is displaced from the arrow direction B to the arrow direction C at an acute angle, the polarizing plate 40 cannot be completely bent according to the adhesive belt 35, and the release film 41 is peeled off from the guide roller 37 as a base point.
Move in the direction of arrow B.

As shown in FIG. 3, the pressing roller 22 is synchronized with the peeling of the release film 41 at substantially the same timing.
The polarizing plate 40 is pressed and attached to the upper surface of the panel body 12 from the front end portion where the release film 41 has begun to be peeled off. The surface of the polarizing plate 40 from which the release film 41 has been peeled off serves as an adhesive layer 42 and is always facing downward, so that dust or the like is difficult to accumulate, and the release film 41 is attached almost in synchronization with peeling. Since the adhesive layer 42 is exposed for a short period of time, dust and the like are less likely to adhere.

When the sticking of the polarizing plate 40 on the panel body 12 is completed, the respective mechanical parts including the panel receiving mechanism part 10 are retracted and returned to their original positions, and a new panel main body 12 and a polarizing plate are formed. 40 is set by each mechanism. In this embodiment, neither the automatic setting of the panel body 12 and the polarizing plate 40 or the manual setting is mentioned, but it can be automated. The object of the present invention is to improve the yield and throughput by automating and unmanning the operation of peeling the release film 41 from the polarizing plate 40 at the time of attachment. It should be noted that, in the above-described embodiment, the occurrence rate of defective products due to pasting can be reduced to one fourth and the throughput can be improved to about four times as compared with the conventional example.

[0016]

As described above, according to the method for sticking a polarizing plate and the apparatus therefor according to the present invention, the adhesive layer of the polarizing plate which is the peeling surface of the releasing film is automatically peeled off from the polarizing film. Uses a method that is downward and has a short contact time with the working environment, so the adhesion of foreign matter is kept to a minimum, so it is necessary to efficiently mass-produce liquid crystal display panels with high quality and good yield. You can

[Brief description of drawings]

FIG. 1 is a layout view with a partial cross-section showing an entire embodiment of a polarizing plate sticking device according to the present invention.

FIG. 2 is a sectional view showing a main part of a release film automatic peeling mode by the apparatus of the embodiment.

FIG. 3 is a sectional view showing a main part of a release film automatic peeling mode according to the apparatus of the embodiment.

FIG. 4 is a layout diagram in partial cross section showing the entire polarizing plate sticking device of a conventional example.

FIG. 5 is a cross-sectional view showing a release film automatic peeling mode by a conventional device.

FIG. 6 is a cross-sectional view showing a release film automatic peeling mode similarly by a conventional device.

[Explanation of symbols]

 10 panel receiving mechanism section 11 table 12 panel body 20 (21) foreign matter cleaning roller (automatic cleaning means) 22 pressing roller (pressing means) 30 sticking mechanism section 35 adhesive belt (feeding belt) 36 guide member 40 polarizing plate 41 release film 42 Adhesive layer

Claims (2)

[Claims] 1. A panel body of a liquid crystal display panel is set on the one hand, and a polarizing plate is set on the other side with a release film, which is releasably attached by an adhesive layer, on the lower side, and the polarizing plate is attached in a predetermined manner. Move to the attachment position,
A method of sticking a polarizing plate, characterized in that the release film is peeled off at the sticking position, and the polarizing plate is stuck and pressed from the peeled part to the panel body with an adhesive layer. 2. A sticking device for sticking a polarizing plate to one surface side of a panel body of a liquid crystal display panel, and a panel receiving mechanism part for holding the panel body on the table with one surface side facing upward, and to a pasting position. It has a rotating feed belt, and this feed belt carries the release film by sticking the release film on the upper adhesive surface of the release film and transports it by adhering the release film. The sticking mechanism that peels the release film from the regulated polarizing plate with the feed belt, and the movement of the polarizing plate that has been conveyed to the pasting position with the feed belt, and the peeling part where the release film is peeled off. A sticking device for a polarizing plate, comprising: a pressing unit that pushes the sticker down and then sticks it to the panel body.