JP5697769B2 - Polarizing film pasting device - Google Patents

Description

  The present invention relates to a polarizing film sticking apparatus, and more specifically, in the conventional method of sticking a polarizing film to a liquid crystal cell substrate, the front portion of the polarizing film is bent and air bubbles are formed between the polarizing film and the liquid crystal cell substrate. The problem is that the endless track adhesive sheet of left and right tilt rollers and fixed rollers is installed, and the polarizing film is placed on the flat adhesive sheet, and then the polarizing film is attached to the substrate of the liquid crystal cell. When the polarizing film is stuck on the surface of the liquid crystal cell substrate, the polarizing film does not generally warp, and the possibility of bubbles is greatly reduced. The present invention relates to a polarizing film sticking device characterized by preventing and eliminating the possibility of product defects.

  FIG. 1 is an overall plan view showing a schematic configuration of a polarizing film sticking device in a conventional embodiment. FIG. 2 is an overall side view showing a schematic configuration of a polarizing film sticking apparatus according to a conventional embodiment.

  Referring to FIG. 1 and FIG. 2, the characteristic of the conventional polarizing film sticking apparatus (1000) is that the liquid crystal cell substrate (1) is raised instead of being transported on a plane. Each polarizing film (2, 3) is affixed to the first and second main surfaces of the substrate (1) of the liquid crystal cell while being transported in a wet state.

  An upright transfer line (50) is provided for transferring the liquid crystal cell substrate (1) in an upright state. The conventional upright transfer line (50) includes a bottom side support roller (11) that supports the bottom side of the liquid crystal cell substrate (1) over the entire length thereof, and the first and second main surfaces of the liquid crystal cell substrate (1). One main surface support roller (12) to be supported is discharged at a predetermined pitch. In transporting the substrate (1) of the liquid crystal cell, for example, the drive shaft is connected to the bottom support roller (11) and the bottom support roller (11) is rotated to transport the substrate (1) of the liquid crystal cell. Make it possible.

  A substrate loader station (100) on which a plurality of substrate cassettes (110) for stocking a plurality of liquid crystal cell substrates (1) in a standing state is waiting is installed on the upstream inlet side of the standing transfer line (50). Has been. The transfer of the liquid crystal cell substrate (1) from the substrate cassette (110) to the upright transfer line (50) can be easily realized by, for example, driving and controlling the bottom support roller (111) installed in the substrate cassette (110). It becomes possible.

  As another method, a configuration using a robot arm or the like is also possible. The substrate cassette (110) is installed so as to be controllable in a direction perpendicular to the conveyance direction of the standing conveyance line (50) from the substrate loader station (100).

  The standing transfer line (50) includes a cleaning line (200) for cleaning the liquid crystal cell substrate (1) in an upright state and a liquid crystal cell substrate (1) in a state where the liquid crystal cell substrate (1) is upright ( 1) is provided with an upright polarizing film sticking line (300) for sticking the polarizing film (2, 3) to the first and second main surfaces.

  The standing polarizing film affixing line (300) includes a panel cleaning station (station) (310) for receiving the liquid crystal cell substrate (1) sent from the unloading station (250) and a liquid crystal cell substrate (1) in the standing state. A polarizing film application station (320) for attaching a polarizing film (2, 3) to the first and second main surfaces and a foreign substance inspection station (station) (330) for inspecting foreign material contamination are installed. Has been.

  A process of attaching the polarizing film (2, 3) to the first and second main surfaces of the liquid crystal cell substrate (1) simultaneously at the polarizing film application station (320) is adopted. A first polarizing film transport line (400A) for supplying the first main surface of the liquid crystal cell substrate (1) and a polarizing film (3) for supplying the second main surface of the liquid crystal cell substrate (1). The second polarizing film transport line (400B) is arranged to be line symmetrical with the liquid crystal cell substrate (1) in between. Here, examples of the polarizing film (2) include a CF plane side polarizing film, and examples of the polarizing film (3) include a TFT plane side polarizing film.

  The first polarizing film transport line (400A) and the second polarizing film transport line (400B) have a release station (470A, 470B) for peeling the mold releasing film from the polarizing films 2 and 3, respectively. ) Is installed.

  The release stations (470A, 470B) are controlled by a release control box (460A, 460B) and controlled by this to release the mold releasing film along the diagonal direction of the polarizing film (2, 3). Peeling arms (461A, 461B) are installed that enable.

  At the positions on both sides of the substrate (1) of the liquid crystal cell, the main surface of the liquid crystal cell substrate (1) in an upright state by sucking and fixing the polarizing film (2, 3) from which the mold releasing film has been peeled off A set table (321A) for the first polarizing film and a set table (321B) for the second polarizing film for standingly transporting the polarizing film (2, 3) to a position opposite to are set. Further, pressure-bonding rollers (322A, 322B) for pressing the polarizing films (2, 3) against the liquid crystal cell substrate (1) are installed.

  The pasting process for pasting the polarizing film (2, 3) to the liquid crystal cell substrate (1) in the conventional polarizing film pasting apparatus (1000) having the above configuration will be described.

  The substrate (1) of the liquid crystal cell is transported following the standing polarizing film pasting line (300), and while being in the polarizing film pasting station (320), the substrate (1) of the liquid crystal cell is transported in a standing state. However, the polarizing film (2) sucked and held on the first polarizing film table (321A) is attached to the first main surface of the substrate (1) of the liquid crystal cell. At the same time, the polarizing film (3) sucked and held on the second polarizing film set table (321B) is attached to the second main surface of the substrate (1) of the liquid crystal cell.

  FIG. 3 is a schematic view of a cross-sectional structure of a conventional color liquid crystal display.

  Color liquid crystal display (10) is a liquid crystal cell substrate (1 etc.) of glass substrate with liquid crystal, alignment film, transparent electrode (transference electrode), color filter (electric-wave filter) sandwiched between And polarizing films (2, 3) disposed on the first main surface side and the second main surface side (CF surface side, TFT surface side) of the substrate (1) of the liquid crystal cell.

  The manufacturing process of a color liquid crystal display having such a structure includes various processes such as a TFT array process, a color filter manufacturing process, a cell assembly process, and a module assembly process. Among these steps, a polarizing film sticking step on the liquid crystal cell substrate (1) can be mentioned.

  FIG. 4 is a first cross-sectional process diagram illustrating an outline of a process for attaching a polarizing film to a conventional liquid crystal cell substrate. FIG. 5 is a second cross-sectional process diagram showing an outline of a process for attaching a polarizing film to a conventional liquid crystal cell substrate.

  A polarizing film sticking process is a process implemented after a liquid crystal cell assembly process. As shown in FIG. 4, a release film (2) is disposed on the first main surface side of the substrate (1) of the liquid crystal cell to expose the adhesive layer on the surface of the polarizing film (2). mold releasing film) (2a) is separated from polarizing film (2).

  Thereafter, as shown in FIG. 5, the polarizing film (2) adsorbed and fixed to the set table (2A) is tilted up to the liquid crystal cell substrate (1) side, and the liquid crystal cell substrate (1) and the polarizing film (2) Is fed to the conveying roller (5), and the polarizing film (2) is brought into close contact with the first main surface (CF surface) of the substrate (1) of the liquid crystal cell.

  Thereafter, after the substrate (1) of the liquid crystal cell is inverted, the polarizing film (3) is similarly attached to the second main surface (TFT surface) of the substrate (1) of the liquid crystal cell.

  However, the conventional method of attaching a polarizing film to a liquid crystal cell substrate has a problem that air bubbles are likely to be generated between the liquid crystal cell substrate and the polarizing film. This is because the part of the polarizing film that is not placed on the set table in FIG. 5 is placed so as to bend downward rather than being held flat in a straight line. This is because floating occurs at the right corner end and the right corner end of the substrate of the liquid crystal cell.

  In addition, according to the conventional method of attaching a polarizing film, the polarizing film (2) is weakly adsorbed by the set table (2A) .At this time, while the transport roller (5) rotates, the substrate of the liquid crystal cell ( 1) and the polarizing film (2) whose ends are attached to the liquid crystal cell substrate (1) are caused to generate tensile stress as a whole by the force of the polarizing film (2) moving in the direction of the arrow, and the polarizing film (2 ) Will be stretched, and because of the length of the stretched polarizing film (2), the entire length of the stretched polarizing film (2) will be finer than the length that should be attached to the liquid crystal cell substrate (1). As a result, the substrate (1) of the liquid crystal cell is warped.

  The present invention has been devised in order to solve the above-described problem of the method of attaching the conventional polarizing film to the liquid crystal cell substrate. Conventionally, most of the area of the polarizing film is adsorbed on the set table to the front part. Instead of the method exposed outside the set table, an adhesive sheet with endless tracks is installed on the left and right tilt rollers and fixed rollers, and polarized on the adhesive film that forms the upper part of the flat adhesive sheet as a whole. After placing the film, the polarizing film is attached to the liquid crystal cell substrate, and the polarizing film is not warped as a whole. When the polarizing film is attached to the surface of the liquid crystal cell substrate, the possibility of bubbles is remarkable. The polarizing film sticking device is characterized in that the occurrence of defects is eliminated, and the occurrence of warpage of the liquid crystal cell substrate due to the extension of the polarizing film is prevented. An object of the present invention is to.

  In order to achieve the above object, the polarizing film sticking device according to the present invention is a polarizing film sticking device for sticking a polarizing film to the surface of a liquid crystal cell substrate.

  The polarizing plate film pasting apparatus is a panel transport plate that transports the substrate of the liquid crystal cell while adsorbed to the bottom surface,

Adhesive sheet on which the polarizing film is placed

The pressure-sensitive adhesive sheet is configured by an endless track system , and is installed so as to be spanned between a tilt roller and a fixed roller . The tilt roller is attached to the panel transport plate in order to attach the polarizing film to the liquid crystal cell substrate. The liquid crystal cell substrate is configured to move upward so as to contact the liquid crystal cell substrate,

  The pressure-sensitive adhesive sheet is composed of a Teflon (registered trademark) glass fiber sheet on the inside, and the outside is composed of a pressure-sensitive adhesive film.

  The tilt roller is connected to a tilt power unit driven by a servo motor and moves up and down.

  The tilt roller and the fixed roller are configured with no power,

  With the tilt roller moving upward and the stepped portion of the polarizing film attached to the stepped portion of the liquid crystal cell substrate,

  The liquid crystal cell substrate is moved by the panel transport plate, and at the same time, the polarizing film is gradually attached to the liquid crystal cell substrate, and the tilt roller and the fixed roller rotate.

  The polarizing film sticking apparatus according to the present invention is a method in which most of the area of the polarizing film is adsorbed on the set table and the front part of the polarizing film that is first bonded to the liquid crystal cell substrate is exposed outside the set table. In addition, an adhesive sheet is installed on the tilt roller and the fixed roller installed on the left and right by an endless track system, and a polarizing film is disposed on the adhesive sheet, and the tilt roller is tilted upward to be in close contact with the liquid crystal cell substrate. As the liquid crystal cell substrate moves, the polarizing film gradually adheres to the liquid crystal cell substrate so that the polarizing film does not bend as a whole, and there is no phenomenon between the polarizing film and the surface of the liquid crystal cell substrate. This has the effect of significantly reducing the possibility of bubble generation.

  Further, in the present invention, when the polarizing film is attached to the liquid crystal cell substrate, there is no problem that the length of the polarizing film is extended even if it is fine as in the prior art, so the warpage of the liquid crystal cell substrate does not occur. When the polarizing film is gradually attached to the liquid crystal cell substrate, the adhesive roller moves at the same speed as the liquid crystal cell substrate moves because the tilt roller rotates in the direction in which the liquid crystal cell substrate moves. No tensile stress is generated.

  Therefore, this has the effect of significantly reducing the defective rate of the liquid crystal cell substrate on which the polarizing film is installed, and has the effect of significantly reducing various costs such as production costs.

FIG. 1 is an overall plan view showing a schematic configuration of a polarizing film sticking apparatus in a conventional manner. FIG. 2 is an overall side view showing a schematic configuration of a polarizing film sticking apparatus in a conventional form. FIG. 3 is a schematic view of a cross-sectional structure of a conventional color liquid crystal display. FIG. 4 is a first cross-sectional process diagram illustrating an outline of a polarizing film attaching process as a conventional liquid crystal cell substrate. FIG. 5 is a second cross-sectional process diagram illustrating an outline of a polarizing film attaching process as a conventional liquid crystal cell substrate. FIG. 6 is a diagram illustrating a first stage of attaching a polarizing film to a liquid crystal cell substrate using the polarizing film attaching apparatus according to the present invention. FIG. 7 is a diagram illustrating a second stage of attaching a polarizing film to a liquid crystal cell substrate using the polarizing film attaching apparatus according to the present invention. FIG. 8 is a diagram illustrating a third stage of attaching a polarizing film to a liquid crystal cell substrate using the polarizing film attaching apparatus according to the present invention. FIG. 9 is a diagram illustrating a second step of attaching a polarizing film to a liquid crystal cell substrate using the polarizing film attaching apparatus according to the present invention. FIG. 10 is a perspective view of a set table unit which is a work component of the polarizing film sticking device according to the present invention. FIG. 11 is a side view of a set table unit which is a work component of the polarizing film sticking device according to the present invention. FIG. 12 is an exemplary diagram for explaining a problem when a polarizing film according to a conventional method is adhered to a liquid crystal cell substrate. FIG. 13 is an explanatory view for explaining the feature of the present invention that overcomes the problems of the conventional method of attaching the polarizing film shown in FIG.

  FIG. 6 is a diagram illustrating a first stage of attaching a polarizing film to a liquid crystal cell substrate using the polarizing film attaching apparatus according to the present invention.

  Referring to FIG. 6, the liquid crystal cell substrate (1) is adsorbed on the upper side of the position where the polarizing film (2) is placed in such a state that the polarizing film (2) is adhered to the adhesive sheet (30) according to the present invention. The panel transport plate (40) is configured to be positioned.

  The pressure-sensitive adhesive sheet (30) of the present invention is composed of a Teflon sheet and a pressure-sensitive adhesive film formed on the Teflon sheet.

  The panel transport plate (40) of the present invention is configured to move in the direction of the arrow (see FIG. 2) by a power means (not shown) such as a motor, and the tilt roller (20) according to the present invention is configured to move to the panel transport plate (40). It can be adjusted so that the position is tilted up and down so that it touches the liquid crystal cell plate (1) that is adsorbed, and the fixed roller (22) is fixed so that the position does not move up and down Is done.

  The tilt roller (20) and the fixed roller (22) of the present invention are not configured so as to be connected to a driving means such as a motor and can be moved, but are simply configured without power.

  In the drawing, one tilt roller (20) and one fixed roller (22) are shown, but in practice, the area taken up increases as the diameter of each roller increases, and in fact the tilt roller (20) The fixed roller (22) is configured as one or more rollers.

  Since the adhesive sheet corresponds to a consumable part, a sheet coupling part (32) is configured for replacement.

  FIG. 7 is a view illustrating a second stage of attaching a liquid crystal cell substrate polarizing film using the polarizing film attaching apparatus according to the present invention.

  Referring to FIG. 7, the left side of the liquid crystal cell substrate (1) where the tilt roller (20) of the present invention is tilted upward and is adsorbed to the left corner of the polarizing film (2) and the panel transport plate (40). It is in contact with the corner part.

  Adjustment of the position where the liquid crystal cell substrate (1) is attracted to the panel transport plate (40) and the position where the polarizing film (2) is placed on the adhesive sheet (30) is performed by a separately installed camera and moving means. This corresponds to the prior art.

  FIG. 8 is a diagram illustrating a third stage of attaching a polarizing film to a liquid crystal cell substrate using the polarizing film attaching apparatus according to the present invention.

  Referring to FIG. 8, the panel transport plate (40) according to the present invention is moved in the direction of the arrow, and the tilt roller, (20) is attached to the liquid crystal cell substrate (1) in the upward direction. ) Is rotated by moving in the direction of the arrow, and the polarizing film (2) is gradually attached to the surface of the liquid crystal cell substrate (1).

  FIG. 9 is a diagram illustrating a fourth stage of attaching a polarizing film to a liquid crystal cell substrate using the polarizing film attaching apparatus according to the present invention.

  Referring to FIG. 9, when the panel transport plate (40) according to the present invention moves in the direction of the arrow, the liquid crystal cell substrate (1) adsorbed to the panel transport plate (40) also moves together, and at the same time a non-powered tilt roller ( The polarizing film (2) adhered to the adhesive sheet (30) is adhered to the surface of the liquid crystal cell substrate (1) while the 20) and the fixing roller (22) are also rotated.

  FIG. 10 is a perspective view of a set table unit which is one component of the polarizing film sticking device according to the present invention. FIG. 11 is a side view of a set table unit which is one component of the polarizing film sticking device according to the present invention.

  Referring to FIG. 10 or FIG. 11, the set table unit according to the present invention includes a tilt unit (41) and a tilt unit (a configuration in which the polarizing film (2) is placed so as to be temporarily adhered and the one-stage portion moves up and down. 41) The one stage part includes a tilt power part (42) that tilts up and down around the other stage part.

  The tilt unit (41) according to the present invention is a tilt roller (20) that moves up and down, a fixed roller (22) that does not move up and down, and a tilt roller (20) that is installed on the fixed roller (22). Is configured to include.

  The tilt power unit (42) according to the present invention is composed of a servo motor as a driving means and a gear connected to the servo motor (this is a general technique for those skilled in the art and will not be described in detail). The one step portion of the tilt unit (41) positioned in the upper direction of the portion (42) is configured to move up and down while rotating around the other step portion on the opposite side.

  FIG. 12 is an exemplary diagram for explaining a problem when a polarizing film is adhered to a liquid crystal cell substrate by a conventional method.

  FIG. 13 is a diagram illustrating problems actually occurring during the process of attaching a polarizing film to the conventional liquid crystal cell substrate illustrated in FIG. 5 as an example of the prior art illustrated in FIG.

  As shown in FIG. 12, the part of the polarizing film (2) that is adsorbed and fixed to the conventional set table (2A) is exposed in a straight line as shown in FIG. However, the problem is that it cannot be kept flat and is actually tilted in one direction.

  As described above, due to the problem that the exposed portion of the polarizing film (2) is bent upward or downward on the set table (2A), the bent portion of the polarizing film (2) is completely separated from the liquid crystal cell substrate (1). There was a problem that bubbles could be generated between the polarizing film (2) and the liquid crystal cell substrate (1), resulting in defective products.

  Also, according to the conventional method of attaching a polarizing film, the polarizing film (2) is weakly adsorbed by the set table (2A), but at this time the liquid crystal cell substrate (1) and the liquid crystal are rotated while the transport roller (5) rotates. The polarizing film (2) with the ends attached to the cell substrate (1) is moved in the direction of the arrow to generate tensile stress on the entire polarizing film (2) and extend the polarizing film (2). Due to the length of the extended polarizing film (2), the total length of the extended polarizing film (2) becomes slightly longer than the length that must be attached to the liquid crystal cell substrate (1), resulting in In particular, the liquid crystal cell substrate (1) is warped.

  FIG. 13 is an explanatory diagram for explaining the characteristics of the present invention overcoming the problems of the conventional method of attaching the polarizing film shown in FIG.

  Referring to FIG. 13, in sticking a polarizing film according to the present invention, an adhesive sheet (30) moved in an endless track is installed on a tilt roller (20) that moves up and down and a fixed roller (22) that keeps the installed position. It is a configuration.

  The polarizing film (2) to be attached to the liquid crystal cell substrate (1) that moves in the direction of the arrow together with the panel transport plate (40) while being adsorbed to the panel transport plate (40) according to the present invention is an adhesive sheet (30). With the tilt roller (20) tilted upward and the corner of the polarizing film (2) in contact with the corner of the liquid crystal cell substrate (1), the panel transport plate (40) As the liquid crystal cell substrate (40) moves in the direction of the arrow, the polarizing film (2) adhered on the adhesive sheet (30) gradually rotates the liquid crystal cell substrate (1) while the till roller (20) rotates. The remaining portion of the polarizing film is configured to be gradually attached to the liquid crystal cell substrate (1).

  The tilt roller (20) and the fixed roller (22) according to the present invention do not rotate by driving means such as a motor, and are configured without power.

  Since the adhesive material is applied to the surface of the polarizing film (2) that is adhered onto the adhesive sheet (30), which is adhered to the liquid crystal cell substrate (1), it is adsorbed to the panel transport plate (40). While the liquid crystal cell substrate (1) moves in the direction of the arrow, the non-powered tilt roller (20) and the fixed roller (22) also rotate.

  If the tilt roller (20) and fixed roller (22) are moved by a separate drive, the movement speed of the panel transport plate (40) and the rotation speed of the tilt roller (20) and fixed roller (22) will be accurate. Unless synchronized, when the polarizing film (2) is attached to the liquid crystal cell substrate (1), problems such as stretching and warping of the polarizing film (2) do not occur. However, even if it is fine, if it is not synchronized, there is a high possibility that a problem will occur when the polarizing film (2) is attached to the liquid crystal cell substrate.

  For this reason, the tilt roller (20) and the fixed roller (22) according to the present invention can be started without power.

  Further, in the present invention, when the polarizing film (2) is attached to the liquid crystal cell substrate (1), there is no problem that the length of the polarizing film (2) extends even finely as in the original technique. The warpage of the liquid crystal cell substrate (1) does not occur. When the polarizing film (2) is gradually attached to the liquid crystal cell substrate (1), the tilt roller (20) rotates in the direction in which the liquid crystal cell substrate (1) moves. No tensile stress is generated in the polarizing film (2) because it moves at the same speed as 1).

  Recently, the size of the color liquid crystal display has been increased, and the size of the conventional color liquid crystal display was mainly 15 inches, but now 30 inches and 45 inches are available. From now on, it is believed that the size of color liquid crystal displays will increase at an accelerated pace.

  The present invention has been described with reference to the embodiments shown in the drawings. However, the present invention is illustrative, and various modifications and equivalents will occur to those skilled in the art. It can be seen that an embodiment is possible. Accordingly, the true scope of protection of the present invention should be determined solely by the appended claims.

1 LCD cell substrate
2 Polarizing film
20 Tilt roller
22 Fixed roller
30 Adhesive sheet
32 Seat connection
40 Panel transport plate
41 Tilt unit
42 Tilt power unit

Claims (3)

A polarizing film sticking device that attaches a polarizing film to the surface of a liquid crystal cell substrate.
The polarizing film sticking device is
A panel transport plate for transporting the liquid crystal cell substrate while adsorbed to the bottom surface;
An adhesive sheet on which the polarizing film is placed;
The pressure-sensitive adhesive sheet is configured by an endless track system, and is installed so as to be spanned between a tilt roller and a fixed roller,
The tilt roller is configured to move upward so as to contact the liquid crystal cell substrate adsorbed to the panel transport plate in order to attach the polarizing film to the liquid crystal cell substrate.
When the polarizing film is placed flat on the pressure-sensitive adhesive sheet without being bent, and the tilt roller is tilted upward,
The polarizing film is placed so that the corner end of the polarizing film is in contact with the corner end of the liquid crystal cell substrate, and the tilt roller and the fixed roller are configured with no power,
With the tilt roller moving upward and the corner of the polarizing film attached to the end of the substrate of the liquid crystal cell,
Polarized light characterized in that the liquid crystal cell substrate is moved by the panel transport plate, and at the same time, the polarizing film adhered to the adhesive sheet is adhered to the substrate of the liquid crystal cell, and the tilt roller and the fixed roller rotate. Film sticking device. 2. The polarizing film sticking apparatus according to claim 1, wherein the pressure-sensitive adhesive sheet has a Teflon glass fiber sheet on the inside and a pressure-sensitive adhesive film on the outside. In the polarizing film laminating apparatus according to claim 1, said tilt roller polarizing film laminating apparatus characterized by moving up and down by a servo motor.

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