TW201930981A - Continuous inspection method and apparatus for optical display panels, and continuous manufacture method and system for optical display panels capable of detecting defects with the same or higher accuracy even if the number of imaging units is reduced - Google Patents

Abstract

The present invention provides a continuous inspection method and a continuous inspection apparatus for optical display panels, with which defects can be detected with the same or higher accuracy even if the number of imaging units is reduced in comparison with the prior art. The continuous inspection method for optical display panels includes: a first irradiation step for irradiating a line inspection region of the optical display panel with a first linear light parallel to the width direction of the optical display panel from the direction perpendicular to one surface of the optical display panel and inclined for a first angle toward the upstream side in the conveyance direction, wherein the width direction is perpendicular to the conveyance direction of the optical display panel; a second irradiation step for irradiating the line inspection region with a second linear light parallel to the width direction of the optical display panel from the direction perpendicular to one surface of the optical display panel and inclined for a second angle toward the downstream side in the conveyance direction; and an imaging step for using one imaging unit to continuously photograph the line inspection region irradiated by the first linear light and the second linear light linearly parallel to the width direction of the optical display panel.

Description

Continuous inspection method and continuous inspection device for optical display panel, continuous manufacturing method and continuous manufacturing system for optical display panel

FIELD OF THE INVENTION The present invention relates to a continuous inspection method and a continuous inspection device for an optical display panel, and a continuous manufacturing method and a continuous manufacturing system for an optical display panel.

BACKGROUND OF THE INVENTION The inspection method of Patent Document 1 discloses that linear light parallel to the width direction of a conveying device is irradiated vertically from one side of a liquid crystal display panel, and the other side of the liquid crystal display panel is provided with two imaging units. An area illuminated by linear light is captured, and the two imaging units are symmetrically arranged on the other surface side of the liquid crystal display panel at positions inclined at a predetermined angle with respect to the irradiation direction toward the panel conveyance direction and the direction opposite thereto.

Patent Document 1: Japanese Patent Application Publication No. 2012-194509

SUMMARY OF THE INVENTION Problems to be Solved by the Invention The inspection method of Patent Document 1 includes two imaging units that image an inspection area from two different angles, and detects that one of the two imaging units does not strongly move toward the irradiation direction. The foreign object that is scattered downstream and strongly scattered upstream in the conveying direction is detected by the other of the two imaging units without being strongly scattered toward the upstream and strongly scattered downstream. That is, since there are defects (foreign matter) that can be detected only by the first imaging unit on the upstream side in the conveyance direction and defects (foreign matter) that can be detected only by the second imaging unit on the downstream side in the conveyance direction, two imaging units need to be arranged.

However, since a plurality of imaging units are provided, the equipment cost increases. In addition, the time for adjusting the optical axis of the imaging unit is also increased in proportion to the number of units. The capacity of the storage medium required to save the captured image data for a long time also increases in proportion to the number of units.
In addition, in the inspection method of Patent Document 1, it is necessary to perform image processing on the two image data acquired by the two imaging units, and then match the position of the defect obtained based on each image data with the coordinates to make it. Single defect message.

Accordingly, an object of the present invention is to provide a continuous inspection method of an optical display panel capable of detecting defects with the same degree or higher accuracy even if the number of imaging units is reduced compared to the past, and a continuous inspection device therefor.
In addition, another object is to provide a continuous manufacturing system for an optical display panel capable of continuously producing a high-quality optical display panel at high speed by inspecting the optical display panel with high accuracy while carrying the optical display panel at high speed, and a continuous production of the optical display panel. Production method.
Means to solve the problem

In order to solve the above problems, as a result of repeated studies, the following invention has been completed.

The present invention is a continuous inspection method for an optical display panel. The optical display panel is continuously and optically inspected while the optical display panel is being transported. Both sides or one side of the optical display panel is provided with at least an optical function film. Optical film, the aforementioned continuous inspection method for an optical display panel includes the following steps:
In the first irradiation step, a first irradiation unit that irradiates first linear light parallel to the width direction of the optical display panel is used. The first irradiation portion is inclined toward the upstream side in the conveying direction (d1) from the perpendicular to one side of the optical display panel. At an angle (θ1), the first linear light is irradiated to the line inspection area of the optical display panel being transported, and the width direction of the optical display panel is orthogonal to the transport direction (d1) of the optical display panel Direction (d2);
The second irradiation step uses a second irradiation unit that irradiates second linear light parallel to the width direction of the optical display panel, and is inclined toward the downstream side in the conveying direction (d1) from the perpendicular to one side of the optical display panel. The direction of two angles (θ2) irradiates the second line-shaped light to the aforementioned line inspection area of the optical display panel being transported, and the width direction of the optical display panel is orthogonal to the transport direction (d1) of the optical display panel Direction (d2); and an image capturing step, the first line-shaped light and the second line-shaped light illuminated by the first line-shaped light and the second line-shaped light are irradiated from the other surface of the optical display panel with an image capturing unit to the optical display. The panel is continuously photographed in a line shape parallel to the width direction.

In the above invention, in the imaging step, the line inspection area may be imaged from the other surface of the optical display panel via a slit portion, and the slit portion defines an imaging area corresponding to the line inspection area.

In the above invention, the imaging unit may be disposed in a direction perpendicular to the other surface of the optical display panel.

In the above invention, in the first irradiation step and the second irradiation step, the first angle (θ1) and the second angle (θ2) may have the same value. The irradiation direction is symmetrical to the irradiation direction of the second linear light.

In the invention described above, when the optical display panel on which one surface of the optical film is provided on one side is continuously being optically inspected, the inspection filter is disposed and photographed, and the inspection filter is photographed. The optical filter has an optical axis corresponding to the optical axis of the optical functional film included in the optical film, and the inspection filter is disposed between the first irradiation section, the second irradiation section, and the one imaging section, and is provided from the optical The other side of the display panel, which is different from the side on which the optical film is provided, is separated from the predetermined distance.
The “predetermined distance” is, for example, a distance that does not contact the surface of the optical display panel, and can be set in consideration of the arrangement relationship between the panel transport section, the illumination section (for example, the first irradiation section and the second irradiation section), and the imaging section.
When the optical function film includes a polarizing film, the inspection filter includes a polarizing film, and the inspection filter is arranged so that the absorption axes of the filters form a mutually orthogonal arrangement relationship.
In addition, the inspection filter may be fixedly arranged, or may be configured to be movable in accordance with the conveyance state of the optical display panel.

Another invention is a continuous inspection device for an optical display panel. The optical display panel is optically inspected continuously while the optical display panel is being transported. Both sides or single sides of the optical display panel are provided with at least optical functions. A thin film optical film, and the continuous inspection device for an optical display panel includes:
The first irradiating section is inclined in a direction inclined by a first angle (θ1) upstream of the conveying direction (d1) from a direction perpendicular to one side of the optical display panel, and irradiates the line inspection area of the optical display panel being conveyed with A first linear light parallel to the width direction of the optical display panel, and the width direction of the optical display panel is a direction (d2) orthogonal to the transport direction (d1) of the optical display panel;
The second irradiating section is inclined in a direction inclined by a second angle (θ2) downstream of the conveyance direction (d1) from a direction perpendicular to one side of the optical display panel, and irradiates the line inspection area of the optical display panel being conveyed. A second linear light parallel to the width direction of the optical display panel, the width direction of the optical display panel being a direction (d2) orthogonal to the conveying direction (d1) of the optical display panel; The other surface of the optical display panel is continuously photographed in a line shape parallel to the width direction of the optical display panel on the line inspection area illuminated by the first linear light and the second linear light.

In the above invention, it may further include a slit portion which is disposed on the other surface side of the optical display panel and defines an imaging area corresponding to the line inspection area.
The imaging unit may perform imaging through the slit portion.

In the present invention, the "one imaging unit" may be a single-eye imaging unit or a compound-eye imaging unit. Corresponding to a predetermined linear imaging area (a fixed area parallel to the film width direction), a plurality of line sensor cameras arranged in a line and a plurality of lines arranged in a straight line (one line) may be used. Monocular camera composition.

In the above invention, the imaging unit may be disposed in a direction perpendicular to the other surface of the optical display panel.

In the above invention, the first and second irradiation sections may be arranged such that the first angle (θ1) and the second angle (θ2) have the same value, and The irradiation direction is symmetrical to the irradiation direction of the second linear light.

The above-mentioned invention further includes a filter for inspection, which is arranged to continuously and optically inspect the optical display panel in a state in which the optical display panel provided with the optical film on one side is being transported. A predetermined distance is set between the first and second irradiating sections and the aforementioned one imaging section, and a different distance from the other side of the optical display panel on which the optical film is provided, and the optical functions included in the optical film The optical axis of the film forms a predetermined arrangement relationship.
The “predetermined distance” is, for example, a distance that does not contact the surface of the optical display panel, and can be set in consideration of the arrangement relationship between the panel transport section, the illumination section (for example, the first irradiation section and the second irradiation section), and the imaging section.
When the optical function film includes a polarizing film, the inspection filter includes a polarizing film, and the inspection filter is arranged so that the absorption axes of the filters form a mutually orthogonal arrangement relationship.
In addition, the inspection filter may be fixedly arranged, or may be configured to be movable in accordance with the conveyance state of the optical display panel.
When the optical display panel and the imaging section are provided in the order of a bright section, an optical film provided on the illumination section side, an inspection filter is disposed between the optical display panel and the imaging section. When a slit portion is disposed between the optical display panel and the imaging portion, the inspection filter may be disposed between the imaging portion and the slit portion, or between the optical display panel and the slit portion.
When the light display panel is arranged in the order of the bright part, the optical display panel provided with an optical film on the imaging part side, and the imaging part, the inspection filter is arranged between the illumination part and the optical display panel, and the illumination light passes through the inspection The light obtained after applying the filter is incident on the inspection area.

According to the present invention, with a simple configuration in which only two lighting processes and one imaging process are performed, it is possible to ensure the inspection capability and reduce the number of imaging units.
In addition, by processing image data obtained from a single imaging unit, it is possible to determine a defect that can be detected only by the imaging unit on the upstream side in the conveyance direction and an imaging unit that can only be detected by the downstream side in the transportation direction. Defects detected. It is not necessary to perform image processing on the two image materials acquired by the two imaging units as in the past to create a single defect information, so that the work and complexity for this can be reduced.

In the present invention, it is preferable that the slit portion disposed on the other surface side of the optical display panel is such that a distance (D1) from the other surface of the optical display panel to the slit portion is smaller than a distance (D2) from the imaging portion to the slit portion. (D1 <D2).
Rather than arranging the slit portion near the imaging portion, it is preferable to arrange the slit portion near the optical display panel (for example, D1 is within 0 mm to 150 mm, preferably within 100 mm, and more preferably within 30 mm).
By arranging the slit portion near the optical display panel, it is possible to prevent the influence of stray light (or reflected light) from the edge portion of the optical display panel when the optical display panel enters or leaves the imaging field of view of the imaging section. It cannot be checked. In addition, when the slit portion is arranged near the imaging portion, the amount of light received by the imaging portion itself is reduced or restricted, which is not suitable.

The continuous manufacturing method of an optical display panel of another invention includes the following steps: a manufacturing step of bonding a first optical film having at least an optical function film to a first surface of an optical unit, and attaching a second optical film having at least an optical function film Bonding to the second surface of the optical unit to manufacture an optical display panel; and the steps included in the aforementioned continuous inspection method of an optical display panel,
Here, the steps included in the manufacturing steps and the continuous inspection method are performed by a series of conveying devices for conveying the optical unit and the optical display panel.

A continuous manufacturing system for an optical display panel according to another invention includes a manufacturing apparatus that attaches a first optical film having at least an optical function film to a first surface of an optical unit, and attaches a second optical film having at least an optical function film. Combined with the second side of the optical unit to manufacture an optical display panel; and the continuous inspection device for the aforementioned optical display panel,
Among them, the manufacturing apparatus and the continuous inspection apparatus are arranged in a series of conveying apparatuses for conveying the optical unit and the optical display panel.

In the aforementioned manufacturing steps and manufacturing apparatus of the invention, it may be:
A single sheet of the first optical film obtained by cutting the first long optical film while releasing the first long release film and the first long optical film from the first optical film roll is attached to the conveyed The first surface of the optical unit, or attaching a single sheet of the first optical film to the first surface of the optical unit;
And / or a single sheet of the second optical film obtained by cutting the second long optical film while releasing the second long release film and the second long optical film from the second optical film roll The optical axis of an optical film and the optical axis of the second optical film are arranged at a predetermined angle to be attached to the second surface of the optical unit to be transported, or a single sheet of the second optical film is formed as a single sheet. The optical axis of the first optical film in the shape of the first optical film and the optical axis of the second optical film in the form of a single plate are arranged at a predetermined angle and are attached to the second surface of the optical unit.

According to the foregoing configuration, two types of linear light (L1, L2) inclined at a predetermined angle are irradiated to the optical display panel while the optical display panel is conveyed, and the transmitted light (P ) The linear and continuous shooting is performed, so that the optical display panel can be conveyed at high speed, and the entire surface of the optical display panel can be captured with a clear contrast, and foreign matter mixed between the optical unit and the optical film can be captured. That is, since the inspection can be performed with high accuracy while the optical display panel is being conveyed at a high speed, a high-quality optical display panel can be continuously produced at a high speed.

In addition, in the aforementioned inspection, not only can foreign objects (such as bonded bubbles, broken glass, thread ends, dirt, dust, etc.) mixed between the optical unit and the optical film can be detected with high accuracy, but also dirt can be detected with high accuracy. Wait.

The irradiating directions of the first and second irradiating sections for irradiating the first and second linear lights are respectively inclined by a predetermined angle from perpendicular to the optical display panel. Therefore, a single imaging section can simultaneously detect a linear shape for one side. The light irradiation direction does not scatter strongly toward the downstream side in the conveyance direction and strongly scatters the foreign matter, and foreign matter that does not strongly scatter the upstream side and strongly scatters the downstream side. Therefore, the optical Display panel for inspection.

In addition, from the viewpoint of inspecting the optical display panel with high accuracy, the first angle (θ1) is 1 ° to 60 ° from the vertical, preferably 5 ° to 45 °, and more preferably 10 ° to 30 °. . In addition, the second angle (θ2) is 1 ° to 60 ° with respect to the vertical, preferably 5 ° to 45 °, and more preferably 10 ° to 30 °.

In the present invention, the "optical film roll" is formed by stacking a long release film and a long optical film (adhesive layer, optical function film, and surface protection film) in the above-mentioned order and forming a roll.
The "roll-to-panel method" refers to the release film and long optical film released from the optical film roll, leaving the release film and cutting the adhesive layer, optical function film and surface protection film in the width direction (half-cut (Half-cut), a method of peeling a long release film from a single-sheet optical film obtained by cutting and bonding the single-sheet optical film to an optical unit through an exposed adhesive layer.

On the other hand, as a bonding method of an optical film different from the roll-to-panel method, there is a "sheet-to-panel method". The "sheet-to-panel method" is a method in which a single-sheet optical film formed in a single-sheet state is bonded to an optical unit through an adhesive layer exposed by peeling off a single-sheet release film or a long release film. The way.
"Slit-containing optical film roll" refers to a single-layer optical film (adhesive layer, optical function film, and surface protection film) laminated on a long release film to form a roll.

Embodiments for Implementing the Invention Hereinafter, a continuous manufacturing system and a continuous manufacturing method for an optical display panel will be described in more detail with reference to FIG. 1, but the present invention is not limited to the aspects of this embodiment.
(Embodiment 1)

The optical display panel is a liquid crystal display panel, an optical unit is a liquid crystal unit, and an optical film is a polarizing film.

A continuous manufacturing system for a liquid crystal display panel includes a continuous manufacturing apparatus 100. The continuous manufacturing apparatus 100 is a first single sheet obtained by cutting the first long polarizing film 11 while releasing the first long release film 12 and the first long polarizing film 11 from the first optical film roll R1. The polarizing film 111 is attached to the first surface 4 a of the liquid crystal cell 4. Alternatively, the continuous manufacturing apparatus 100 may release the second long release film 22 and the second long polarizing film 21 from the second optical film roll R2 while cutting the second long polarizing film 21, The two monolithic polarizing films 211 are attached to the second surface 4b of the liquid crystal cell 4 such that the absorption axis of the first monolithic polarizing film 111 and the absorption axis of the second monolithic polarizing film 211 are orthogonal to each other, thereby manufacturing LCD panel Y.

The continuous manufacturing system for a liquid crystal display panel includes a continuous inspection device 300 that optically inspects the liquid crystal display panel Y while conveying the liquid crystal display panel Y. The continuous manufacturing system for a liquid crystal display panel includes a continuous manufacturing apparatus 100 and a continuous inspection apparatus 300 in a series of conveying apparatuses 400 for conveying the liquid crystal cell 4 and one of the liquid crystal display panels Y.
(Optical film roll)

The optical film roll formed by winding a long polarizing film includes, for example, (1) a continuous long web (web) of a long polarizing film including a release film and an adhesive layer formed on the release film. The long optical film laminate in the form is rolled into a rolled optical film roll. In this case, a continuous manufacturing system for a liquid crystal display panel includes a cutting device (forming a cut-in line) for forming a single-piece polarizing film (sheet) from a long polarizing film, and the cutting device retains a release film. On the other hand, a long polarizing film (including an adhesive layer) is cut (half-cut) at a predetermined interval in a direction orthogonal to the feeding direction of the release film.
In addition, as the optical film roll, for example, (2) an optical film roll obtained by rolling a long optical film laminate having a release film and a monolithic polarizing film (including an adhesive layer) into a roll shape (so-called Of the polarizing film roll with a slit), the aforementioned single-piece polarizing film is adjacent to each other in a direction orthogonal to the feeding direction of the releasing film via a cut-in line on the releasing film.

The first optical film roll R1 shown in FIG. 1 is obtained by rolling a first long optical film laminate 10 into a roll shape. The first long optical film laminate 10 includes a first long release film 12, And a first long polarizing film (including the aforementioned adhesive layer) 11 having an absorption axis parallel to the feed direction (long-side direction) and formed on the first long release film 12 via an adhesive layer.
The second optical film roll R2 is formed by rolling a second long optical film laminate 20 into a roll shape. The second long optical film laminate 20 includes a second long release film 22 and an adhesive agent therebetween. A second long polarizing film (including the aforementioned adhesive layer) 21 is formed on the second long releasing film 22 and has an absorption axis parallel to the feeding direction (long side direction).

The first and second long polarizing films 11, 21 are separated by, for example, a polarizer (thickness of about 5 to 80 μm) and a polarizer protective film (thickness of generally about 1 to 500 μm) formed on one or both sides of the polarizer. It is formed with or without an adhesive (for example, a self-adhesive polarizer protective film).
Examples of other films constituting the first and second long polarizing films 11 and 21 include, for example, a retardation film (thickness is generally 10 to 200 μm), a viewing angle compensation film, a brightness enhancement film, and a surface protection film. The thickness of the first and second long polarizing films 11 and 21 can be, for example, in a range of 10 μm to 500 μm.

The adhesive constituting the adhesive layers of the first and second long polarizing films 11 and 21 is not particularly limited, and examples thereof include an acrylic adhesive, a silicone adhesive, and a urethane adhesive. The thickness of the adhesive layer is preferably in a range of, for example, 10 to 50 μm. As the first and second release films 12, 22, conventionally known films such as plastic films (for example, polyethylene terephthalate film, polyolefin film, etc.) can be used. Further, if necessary, a suitable film conforming to conventional standards, such as a film that has been coated with a suitable release agent such as a polysiloxane-based or long-chain alkyl-based, fluorine-based, or molybdenum sulfide, may be used.
(LCD panel)

The liquid crystal display panel Y is obtained by forming at least a polarizing film on one or both sides of the liquid crystal cell 4 and may be incorporated into a driving circuit as required. The liquid crystal cell 4 can use any type of liquid crystal cell such as a vertical alignment (VA) type and an in-plane switching (IPS) type. The liquid crystal cell 4 has a structure in which a liquid crystal layer is sealed between a pair of substrates (a first substrate 4a and a second substrate 4b) which are arranged to face each other.
(Continuous Manufacturing Device)

The continuous manufacturing apparatus 100 includes a first release film conveying device 101, a first attaching portion 102, a second release film conveying device 103, and a second attaching portion 104.

The first release film conveying device 101 attaches the first long release film 12 and the first long polarizing film 11 (the first long optical film laminate 10) from the first optical film roll R1 to the first optical film roll R1. Section 102 conveys.
In this embodiment, the first release film conveying device 101 includes a first cutting section 31, a first dancer roll 32, a first peeling section 41, and a first winding section 61.

The first cutting section 31 fixes the first long optical film laminate 10 in advance from the first release film 12 side by the first adsorption section 31a, and holds the first long release film to hold the first long film. The polarizing film (including the adhesive layer) 11 is cut in the width direction, and a first single-piece polarizing film 111 is formed on the first long release film 12.
Examples of the first cutting section 31 include a cutter and a laser device. The first adsorption portion 31a may be, for example, an adsorption plate having a large number of holes connected to a vacuum pump and capable of sucking air from the holes using a negative pressure.

The first tension roller 32 has a function for maintaining the tension of the first long release film 12.

The first peeling portion 41 has the first elongated release film 12 inside and reversely folded at the front end portion, and peels the first monolithic polarizing film 111 from the first elongated release film 12. The peeled first monolithic polarizing film 111 is supplied to the first attachment portion 102.
In this embodiment, as the first peeling portion 41, a sharp blade edge portion is used at the front end portion, but it is not limited to this.

The first winding section 61 is used for winding the first long release film 12 from which the first single-piece polarizing film 111 is peeled. The first winding section 61 may be configured by an automatic rotating roller.

The first monolithic polarizing film in which the first attaching section 102 peels the first long release film 12 from the upper side (the first surface 4a) of the liquid crystal cell 4 conveyed by the conveying device 400, and removes the first long release film 12 from the first peeling section 41. 111 is attached through an adhesive layer.
In the present embodiment, the first application section 102 is composed of a first application roller 51a and a first driving roller 51b.

Various devices for attaching the second monolithic polarizing film 211 to the other surface (the second surface 4b) of the liquid crystal cell 4 can use various constituent elements, devices, and the like described above.
The second release film conveying device 103 attaches the second long release film 22 and the second long polarizing film 21 (the second long optical film laminate 20) to the second while releasing the second long release film 22 and the second long polarizing film 21 from the second optical film roll R2. Section 104 conveys.
In this embodiment, the second release film conveying device 103 includes a second cutting section 33, a second tension roller 34, a second peeling section 42, and a second winding section 62.
The second release film conveying device 103 can be composed of the same device as the first release film conveying device 101, and the second attaching portion 104 can be composed of the same device as the first attaching portion 102.
For example, the second cutting section 33 and the second suction section 33a can be configured by the same device as the first cutting section 31 and the first suction section 31a. The second adjustment tension roller 34 can be configured by the same device as the first adjustment tension roller 32. The second winding section 62 can be configured by the same device as the first winding section 61. The second application roller 52a and the second driving roller 52b can be configured by the same mechanism as the first application roller 51a and the first driving roller 51b.
(Irradiation section)

The continuous inspection device 300 includes a first irradiation section 311 which is inclined at a first angle θ1 from the side perpendicular to the side of the liquid crystal display panel Y (the first surface 4 a in FIG. 3) toward the upstream side in the conveying direction. The first line-shaped light L1 parallel to the width direction d2 of the liquid crystal display panel Y (the vertical direction of the paper surface in FIG. 3) to the line inspection area E (see FIG. 3) of the liquid crystal display panel Y being conveyed. The width direction d2 of the display panel Y is a direction orthogonal to the transport direction d1 of the liquid crystal display panel Y.

In addition, the continuous inspection apparatus 300 includes a second irradiation unit 312 which is inclined toward the downstream side in the conveyance direction from the side perpendicular to the side of the liquid crystal display panel Y (the first side 4a in FIG. 3). The direction of the angle θ2 irradiates a second linear light L2 parallel to the width direction of the liquid crystal display panel Y to the line inspection area E of the liquid crystal display panel Y being transported. The conveying direction d1 is orthogonal to the direction d2.

In this embodiment, the first angle θ1 and the second angle θ2 have the same value, and are set to 17 °. In the present embodiment, the first irradiation section 311 and the second irradiation section 312 are arranged such that the irradiation direction of the first linear light L1 and the irradiation direction of the second linear light L2 are symmetrical. The first angle θ1 and the second angle θ2 are not limited to 17 °, and may be 5 ° to 30 °, and preferably 10 ° to 30 °.

The first and second irradiating sections 311 and 312 are not particularly limited as long as they are irradiating the first and second linear lights L1 and L2 that are straight forward, and examples thereof include halogen lamps, metal halide lamps, and LED linear illumination. . In addition, the first and second linear lights L1 and L2 are lights that extend linearly along the width direction d2 of the conveying device 400, and the short-side directions of the first and second linear lights L1 and L2 (the same as those of the conveying device 400) The width of the transport direction d1 is shorter than the transport direction length of the liquid crystal display panel Y. The first and second irradiating sections 311 and 312 may include a lens section for narrowing the width in the short-side direction of the first and second linear lights L1 and L2. Examples of the lens unit include a round rod lens formed along the longitudinal direction of the first and second linear lights L1 and L2. The narrowing of the widths of the first and second linear lights L1 and L2 in the short-side direction to collect light is desirable in that it can irradiate the liquid crystal display panel surface with high-intensity light, and can use a small-area light. The image data is used to reduce the data processing capacity, thereby shortening the calculation processing time (which can increase the speed), and to obtain high inspection accuracy. The distance between the first and second irradiation units 311 and 312 and the transportation device 400 can be appropriately adjusted according to the type, size, and transportation speed of the liquid crystal display panel Y.
(Camera Section)

The continuous inspection device 300 includes one imaging section 316 which is irradiated with the first linear light L1 and the second linear light L2 from the other surface (the second surface 4b in FIG. 1) of the liquid crystal display panel Y. The line inspection area E is continuously imaged in a line shape parallel to the width direction of the liquid crystal display panel Y (direction d2 orthogonal to the conveyance direction d1). Examples of the single imaging unit 316 include optical cameras such as one or more CCD cameras, CMOS sensor cameras, and line sensor cameras arranged in a line. One imaging unit 316 is configured to capture a linear area corresponding to a linear inspection area E that is irradiated with two linear lights. In this embodiment, four CCD cameras are arranged. A straight line.
In this embodiment, one imaging unit 316 is disposed in a direction perpendicular to the other surface (the second surface 4b) of the liquid crystal display panel Y.
In addition, as another embodiment, one imaging unit 316 may be disposed to be inclined at a third angle from the vertical axis with respect to the other surface (the second surface 4b) of the liquid crystal display panel Y. The third angle exemplifies an angle exceeding 0 ° to 30 ° from the vertical axis, for example.

The continuous inspection device 300 includes a slit portion 314 which is disposed on the other surface (second surface 2b) side of the liquid crystal display panel Y and defines an imaging region 314a corresponding to the line inspection region E. The arrangement of each of the first and second irradiation sections 311 and 312, the imaging section 316, and the slit section 314 is fixed relative to the conveying device 400. The imaging section 316 transmits light P (transmitted light image) to the imaging region 314a passing through the slit section 314. Take a shot.
The slit portion 314 is arranged such that a distance D1 from the other surface (the second surface 4b) of the liquid crystal display panel Y to the slit portion 314 is smaller than a distance D2 from the imaging portion 316 to the slit portion 314 (D1 <D2).
In this embodiment, the slit portion 314 is disposed near the liquid crystal display panel Y (for example, D1 is within 10 mm to 50 mm).

In addition, as another embodiment, the first and second light irradiation sections 311 and 312 can be arranged on the upper side of the conveying device 400 according to the state of the liquid crystal display panel Y during the inspection, and one imaging section 316 and the slit section 314 can be arranged. On the underside of the conveyor 400.

In this embodiment, when there is a foreign substance between the liquid crystal cell 4 and the first monolithic polarizing film 111 or the second monolithic polarizing film 211, as shown in FIG. 3, one imaging unit 316 can selectively The light scattered by the foreign object passing through the imaging region 314 a with the slit portion 314 interposed therebetween is captured. Therefore, one imaging unit 316 can capture a foreign object with a clear contrast.
(Conveying device)

The transporting device 400 is a series of transporting devices for transporting the liquid crystal cell 4 and the liquid crystal display panel Y with the first and second monolithic polarizing films 111 and 211 attached to both sides of the liquid crystal cell 4. The conveyance device 400 is configured to include, for example, a conveyance roller 70, a suction plate, and the like. In this embodiment, the conveying device 400 is provided with a winding mechanism for rotating the liquid crystal cell 4 to which the first monolithic polarizing film 111 is attached horizontally by 90 °, and a turning mechanism for turning the liquid crystal cell 4 by 90 °. The liquid crystal cell 4 to which the first monolithic polarizing film 111 is attached is turned upside down. In addition, the conveyance device 400 conveys the liquid crystal display panel Y during the inspection performed by the inspection device 300.
(Check process)

In this embodiment, it is determined whether the liquid crystal display panel Y is a good product or a defective product based on the image data acquired using the imaging unit 316. To this end, the inspection apparatus 300 includes an image processing section 317, a memory 302, an image statistical processing / image combination section 303, and a good / defective determination section 301 as shown in FIG. Description will be made with reference to FIGS. 4 to 6.

First, a control unit (not shown) controls the conveyance device 400 to temporarily stop the liquid crystal display panel Y at the inspection waiting position (see FIG. 6 (a)).
Next, the control unit controls the transportation device 400 and the inspection device 300, starts the transportation of the liquid crystal display panel Y (step S1), and starts the inspection of the inspection device 300 (step S2).

In this inspection, from the start of the inspection to the end of the inspection, the control unit controls the transport device 400 to continuously transport the liquid crystal display panel Y in the transport direction d1. In addition, during this period, the control unit controls the inspection device 300 to irradiate the first and second linear lights L1 and L2 to the liquid crystal display panel Y from the first and second irradiation units 311 and 312, and the imaging unit 316 uses The transmitted light P of the first and second linear lights L1 and L2 irradiating the liquid crystal display panel Y and passing through the imaging area 314 a of the slit portion 314 is linearly captured.
The linear imaging data obtained by the imaging unit 316 is subjected to image processing by the image processing unit 317, and the linear image data after the image processing is stored in the memory 302 (steps S3 and S4. FIG. 6 ( b) The status during the inspection is displayed.) As shown in FIG. 5, the aforementioned processing is sequentially performed until the control unit (not shown) controls the transport device 400 to transport the liquid crystal display panel Y to the inspection end position (see FIG. 6 (c)). ).

Next, the image statistical processing / image combination unit 303 reads out the linear image data subjected to the image processing by the image processing unit 317 from the memory 302, and performs the image statistical processing to create the entire image of the liquid crystal display panel Y. Like data (step 5). Then, the entire image data is stored in the memory 302 (step 6).

Next, the good / bad judgment unit 301 reads the overall image data from the memory 302, and determines the good / bad of the liquid crystal display panel Y based on the overall image data (step S7). Here, in the case where the good / defect determination unit 301 determines that the liquid crystal display panel Y is a good product, the determination result of the good product is stored in the memory 302 in a form related to the identification information of the liquid crystal display panel Y and the like. Step S9). The liquid crystal display panel Y is conveyed to the good product port by the conveying device 400.
On the other hand, in the case where the good / defect determination unit 301 determines that the liquid crystal display panel Y is defective in step S7, the result of determining the defective product is stored in a form associated with the identification information of the liquid crystal display panel Y and the like. Go to the memory 302 (step S10). The liquid crystal display panel Y is conveyed to the defective port by the conveyance device 400.

The control unit (not shown) may be configured to have a processor and a memory, and a program displaying a control sequence is stored in the memory, and the processor executes the aforementioned program. The control unit may also have a structure of a dedicated circuit or firmware.
The image processing unit, the image statistical processing / image combination unit, and the good / defective judgment unit may be configured to have a processor and a memory, and a program for displaying a processing sequence is stored in the memory, and the processor executes the foregoing program. The image processing section, the image statistical processing / image combination section, and the good / bad determination section may be configured to be executed by a dedicated circuit or firmware.
(Continuous inspection method of liquid crystal display panel)

The continuous inspection method of a liquid crystal display panel is to continuously and optically inspect the liquid crystal display panel while the liquid crystal display panel is being transported. Optical films having at least optically functional films (for example, polarizing films) are provided on both sides or one side of the liquid crystal display panel. The continuous inspection method for a liquid crystal display panel can preferably use the above-mentioned continuous inspection device.
The continuous inspection method of the liquid crystal display panel includes the following steps:
In the first irradiation step, a first irradiation portion that irradiates a first linear light parallel to the width direction of the liquid crystal display panel is used, and is inclined at a first angle (θ1) toward the upstream side in the conveying direction from perpendicular to one side of the liquid crystal display panel. ) Direction, the first linear light is irradiated to the line inspection area of the optical display panel being transported, and the width direction of the liquid crystal display panel is a direction orthogonal to the transport direction of the liquid crystal display panel;
In the second irradiation step, the second irradiation section that irradiates the second linear light parallel to the width direction of the liquid crystal display panel is inclined at a second angle (θ2) from the vertical side of the liquid crystal display panel toward the downstream side in the conveying direction. ) Direction, the second linear light is irradiated to the line inspection area of the liquid crystal display panel being transported, and the width direction of the liquid crystal display panel is a direction orthogonal to the transport direction of the liquid crystal display panel; and an imaging step, A line inspection area irradiated with the first linear light and the second linear light from the other surface of the liquid crystal display panel with one imaging section is continuously photographed in a line shape parallel to the width direction of the liquid crystal display panel.

In the imaging step, the line inspection area may be captured from the other side of the liquid crystal display panel via a slit portion, and the slit portion defines an imaging area corresponding to the line inspection area.
The imaging unit may be disposed in a direction perpendicular to the other surface of the liquid crystal display panel.
In the first irradiation step and the second irradiation step, the first angle (θ1) and the second angle (θ2) may be the same value, and the irradiation direction of the first linear light and the irradiation of the second linear light may be the same. Direction is symmetrical.
(Continuous manufacturing method of liquid crystal display panel)

The continuous manufacturing method of a liquid crystal display panel includes the following steps: a manufacturing step of bonding a first optical film having at least an optically functional film (such as a polarizing film) to a first surface of an optical unit; and attaching at least an optically functional film (such as polarized light) The second optical film of the film is bonded to the second side of the optical unit to manufacture a liquid crystal display panel; and the steps included in the continuous inspection method of the liquid crystal display panel, wherein the liquid crystal display panel is used for conveying the liquid crystal cell and the liquid crystal display panel. A series of conveying devices perform manufacturing steps and the steps included in the continuous inspection method described above.
(Other embodiments)

In this embodiment, the first monolithic polarizing film 111 is attached from the upper side of the liquid crystal cell 4, and then the liquid crystal cell 4 to which the first monolithic polarizing film 111 is attached is reversed (the front and back are reversed, and if necessary, Rotate 90 °), and attach a second monolithic polarizing film 211 from the upper side of the liquid crystal cell 4. However, the first monolithic polarizing film may be affixed from the lower side of the liquid crystal cell 4, and after the liquid crystal cell 4 is inverted, the second monolithic polarizing film may be affixed from the lower side of the liquid crystal cell 4. The first monolithic polarizing film is affixed to the upper side of the LCD, so that the liquid crystal cell is not turned over. The second monolithic polarizing film is affixed from the bottom of the liquid crystal cell, and the first monolithic film can also be affixed from the bottom of the liquid crystal cell. The polarizing film does not cause the liquid crystal cell to be inverted, and a second monolithic polarizing film is attached from the upper side of the liquid crystal cell. In addition, the first monolithic polarizing film and the second monolithic polarizing film may be simultaneously attached from the upper and lower sides of the liquid crystal cell.

In this embodiment, a configuration in which optical films are attached to both sides of the optical unit is exemplified. However, the continuous inspection of the present invention may be performed after the optical film is attached to one side of the optical unit. 7A and 7B illustrate a structure in which inspection is performed after a polarizing film is attached to one side of a liquid crystal cell.
FIG. 7A is arranged in the order of the bright portions 311 and 312, the inspection filter 321, the liquid crystal display panel Y provided with the polarizing film 111 on the imaging portion side, the slit portion 314, and the imaging portion 316. The inspection filter 321 may be fixed or may be configured to be movable only during inspection.
FIG. 7B is arranged in the order of the bright portions 311 and 312, the liquid crystal display panel Y provided with the polarizing film 111 on the illumination portion side, the slit portion 314, the inspection filter 322, and the imaging portion 316. The inspection filter 322 may be fixed or may be configured to be movable only during inspection. The inspection filter may be disposed between the liquid crystal display panel Y and the slit portion 314.
The inspection device of FIG. 7A may be disposed downstream of the first attachment portion 102 and may perform inspection. The inspection device of FIG. 7B may be arranged closer to the downstream than the 90 ° -wound up-and-down reversing element to perform inspection.
In FIGS. 7A and 7B, the illumination unit may be disposed on the upper side of the conveyance device 400, and the imaging unit may be disposed on the lower side of the conveyance device 400.

In addition, in the present embodiment, a structure in which an optical film is attached to both sides of the optical unit in a so-called “roll-to-panel method” is exemplified. Method ", the optical film can be attached, and the optical film can also be attached to one side of the optical unit in a" roll-to-panel method "and to the other side in a" sheet-to-panel method. "

In this embodiment, an optical film roll is used, but the structure of the roll-shaped optical film is not limited to this, and a so-called "slit-containing optical film roll" may be used.

In this embodiment, the long polarizing film released from the optical film roll is cut at a predetermined interval, but the present invention is not particularly limited to the aforementioned structure. For example, the long polarizing film unwound from the optical film roll may be inspected for defects, and cutting may be performed so as to avoid defects based on the results of the inspection (so-called skip cut). In addition, it is also possible to read the defect information previously added to the long polarizing film or the mark attached to the defect position, and to cut off in order to avoid the defect based on the defect information or the mark.

In the present embodiment, the long polarizing film has an absorption axis parallel to the longitudinal direction. However, the direction of the absorption axis of the long polarizing film is not limited to this. For example, the first long polarizing film may have an absorption axis parallel to its short side direction (width direction), and the second long polarizing film may have an absorption axis parallel to its long side direction. In this case, a winding mechanism for horizontally rotating the liquid crystal cell to which the first polarizing film is attached by 90 ° can be appropriately omitted.

In this embodiment, a liquid crystal cell is exemplified as the optical cell, but the optical cell is not limited to this, and the optical cell may be an organic EL cell.
The organic EL unit has a structure in which an electroluminescent layer is sandwiched between a pair of electrodes. The organic EL unit can use any type of organic EL unit such as a top emission method, a bottom emission method, and a double emission method. An organic EL display panel is obtained by laminating polarizing films on one or both sides of an organic EL unit, and can be incorporated into a driving circuit as required.
(Example)

In the example, the device according to the first embodiment (FIGS. 3 to 6) was used. The comparative example used the inspection apparatus which arrange | positioned the light irradiation part in the direction orthogonal to the one surface of a liquid crystal display panel, and the imaging part in the direction perpendicular | vertical to the other surface. For the reference example, an apparatus according to Japanese Patent Application No. 2011-60335 (Japanese Patent Application Laid-Open No. 2012-194509) was used (FIGS. 4 to 6).
In the embodiment, the light irradiating section is arranged such that the first angle θ1 and the second angle θ2 become the same value 17 °, and the imaging section is arranged in a direction perpendicular to the liquid crystal display panel. The slit portion is disposed at a position of 20 mm (distance D1) from the other surface (second surface 2b) of the liquid crystal display panel Y.
In the reference example, a light irradiating section is arranged in a direction perpendicular to the liquid crystal display panel, and the imaging section is arranged so as to be inclined by 30 ° with respect to the irradiation direction of the linear light.
The inspection was carried out while 200 sheets (n = 200) of liquid crystal display panels whose defects were identified in advance were conveyed. The number of missing liquid crystal display panels was zero. The number of the examples and the reference examples was zero, but it was 15 in the comparative example. Based on this situation, it can be confirmed that the defect can be detected with the same degree or higher accuracy even if the imaging unit is reduced compared to the past.

4‧‧‧ LCD unit

4a‧‧‧first side; first substrate

4b‧‧‧Second side; second substrate

10‧‧‧The first long optical film laminate

11‧‧‧The first long polarizing film

12‧‧‧ the first release film

20‧‧‧Second long optical film laminate

21‧‧‧Second long polarizing film

22‧‧‧Second Release Film

31‧‧‧The first cutting section

31a‧‧‧First adsorption section

32‧‧‧The first adjustment tension roller

33‧‧‧Second cutting section

33a‧‧‧Second adsorption section

34‧‧‧Second adjustment tension roller

41‧‧‧First Stripping Department

42‧‧‧Second Stripping Department

51a‧‧‧First applicator roller

51b‧‧‧first drive roller

52a‧‧‧Second applicator roller

52b‧‧‧Second driving roller

61‧‧‧Reel I

62‧‧‧Second Rewinding Department

70‧‧‧ transport roller

100‧‧‧ continuous manufacturing equipment

101‧‧‧The first release film conveying device

102‧‧‧First attaching department

103‧‧‧Second release film conveying device

104‧‧‧Second attachment section

111‧‧‧The first single sheet polarizing film

211‧‧‧Second Monolithic Polarizing Film

300‧‧‧Continuous inspection device

301‧‧‧Good / bad judgment department

302‧‧‧Memory

303‧‧‧Image Statistics Processing / Image Combination Department

311‧‧‧First irradiation section

312‧‧‧Second irradiation section

314‧‧‧Slit

314a‧‧‧Image area

316‧‧‧ Camera Department

317‧‧‧Image Processing Department

321, 322‧‧‧ Inspection Filter

400‧‧‧ Conveying device

d1‧‧‧ conveying direction

d2‧‧‧width direction

E‧‧‧line inspection area

L1‧‧‧First linear light

L2‧‧‧Second linear light

P‧‧‧ transmitted light

R1‧‧‧The first optical film roll

R2‧‧‧Second Optical Film Roll

Y‧‧‧LCD display panel

θ1‧‧‧first angle

θ2‧‧‧ second angle

D1, D2‧‧‧ distance

S1 ~ S11‧‧‧step

FIG. 1 is a schematic diagram showing an example of a continuous manufacturing system for an optical display panel.

FIG. 2 is a schematic diagram showing an example of a procedure for laminating an optical film on an optical unit.

FIG. 3 is a schematic diagram showing a state in which a foreign object is inspected.

FIG. 4 is a schematic diagram showing an example of an inspection device.

FIG. 5 is a flowchart showing an example of a processing flow of the inspection device.

FIG. 6 is a schematic diagram showing an example of a state of conveyance of the optical display panel from the waiting of inspection to the end of the inspection.

FIG. 7A is a schematic diagram showing an example of an inspection apparatus according to another embodiment.

FIG. 7B is a schematic diagram showing an example of an inspection apparatus according to another embodiment.

Claims (14)

A continuous inspection method for an optical display panel. The optical display panel is continuously and optically inspected while the optical display panel is being transported, and two or one side of the optical display panel is provided with an optical film having at least an optical functional film. The foregoing continuous inspection method of the optical display panel includes the following steps: In the first irradiation step, a first irradiation portion that irradiates first linear light parallel to the width direction of the optical display panel is used, and is inclined at a first angle toward the upstream side in the conveyance direction from a direction perpendicular to one side of the optical display panel ( θ1), the first linear light is irradiated to the line inspection area of the optical display panel being transported, and the width direction of the optical display panel is a direction orthogonal to the transport direction of the optical display panel; In the second irradiation step, the second irradiation portion that irradiates second linear light parallel to the width direction of the optical display panel is inclined at a second angle to the downstream side in the conveying direction from perpendicular to one side of the optical display panel ( θ2), the second line-shaped light is irradiated to the aforementioned line inspection area of the optical display panel being transported, and the width direction of the optical display panel is a direction orthogonal to the transport direction of the optical display panel; and In the imaging step, a line of the line inspection area illuminated by the first line-shaped light and the second line-shaped light from the other side of the optical display panel with one imaging portion is parallel to the width direction of the optical display panel. Continuous shooting. For example, in the continuous inspection method of the optical display panel according to claim 1, in the aforementioned imaging step, the line inspection area is photographed from the other side of the optical display panel through a slit portion, and the slit portion is delineated from the line inspection. The imaging area corresponding to the area. The continuous inspection method for an optical display panel according to claim 1, wherein the imaging unit is disposed in a direction perpendicular to the other surface of the optical display panel. The continuous inspection method for an optical display panel according to claim 1, wherein in the first irradiation step and the second irradiation step, the first angle (θ1) and the second angle (θ2) have the same value, and the first The irradiation direction of one linear light is symmetrical to the irradiation direction of the second linear light. The continuous inspection method for an optical display panel according to claim 1, wherein when the optical display panel on which one surface of the optical film is provided is being conveyed, the optical display panel is optically inspected continuously, and an inspection filter is disposed. The inspection filter has an optical axis corresponding to the optical axis of the optical functional film included in the optical film, and the inspection filter is disposed between the first and second irradiation sections and the one imaging section. And is arranged to be separated from a predetermined distance from the other side of the optical display panel that is different from the side on which the optical film is provided. A continuous inspection device for an optical display panel. The optical display panel is continuously and optically inspected while the optical display panel is being conveyed. Optical films having at least optical functional films are provided on both sides or single sides of the optical display panel. The aforementioned continuous inspection device for an optical display panel has: The first irradiating section is inclined in a direction inclined by a first angle (θ1) toward the upstream side in the conveying direction from a direction perpendicular to one side of the optical display panel, and irradiates the line inspection area of the optical display panel with the optical display while the optical display panel is being conveyed. The first linear light parallel to the width direction of the panel, and the width direction of the optical display panel is a direction orthogonal to the transport direction of the optical display panel; The second irradiating section is inclined in a direction inclined by a second angle (θ2) toward the downstream side in the conveying direction from perpendicular to one side of the optical display panel, and irradiates the optical inspection panel with the optical inspection panel with the optical inspection area. A second linear light parallel to the width direction of the display panel, the width direction of the optical display panel being a direction orthogonal to the transport direction of the optical display panel; and An imaging unit, the line inspection area illuminated by the first linear light and the second linear light from the other side of the optical display panel is continuous in a line shape parallel to the width direction of the optical display panel To shoot. The continuous inspection device for an optical display panel according to claim 6, further comprising a slit portion disposed on the other side of the optical display panel, and defining an imaging area corresponding to the line inspection area, The imaging unit captures an image through the slit portion. The continuous inspection device for an optical display panel according to claim 6, wherein the imaging unit is disposed in a direction perpendicular to the other surface of the optical display panel. The continuous inspection device for an optical display panel according to claim 6, wherein the first irradiation section and the second irradiation section are arranged such that the first angle (θ1) and the second angle (θ2) have the same value, and The irradiation direction of the first linear light is symmetrical to the irradiation direction of the second linear light. The continuous inspection device for an optical display panel according to claim 6, further comprising an inspection filter, the inspection filter is provided to continuously and optically transmit the optical display panel provided with the optical film on one side. When inspecting the optical display panel, the optical display panel is located between the first and second irradiating portions and the one imaging portion, and is set between the other side and the other side of the optical display panel on which the optical film is provided. The predetermined distance forms a predetermined arrangement relationship with the optical axis of the optical functional film included in the optical film. A continuous manufacturing method of an optical display panel includes the following steps: In the manufacturing step, a first optical film having at least an optical function film is bonded to a first surface of an optical unit, and a second optical film having at least an optical function film is bonded to a second surface of the optical unit to manufacture an optical display. Panels; and If the steps included in the continuous inspection method for an optical display panel according to any one of claims 1 to 5, Here, the steps included in the manufacturing steps and the continuous inspection method are performed by a series of conveying devices for conveying the optical unit and the optical display panel. The continuous manufacturing method of the optical display panel according to claim 11, wherein the aforementioned manufacturing steps are: The monolithic first optical film obtained by cutting the first long optical film while unwinding the first long optical film from the first optical film roll and leaving the long first release film, and attaching it Attaching the first optical film on the first surface of the optical unit to be conveyed, or attaching a single sheet of the first optical film to the first surface of the optical unit; And / or The single optical second optical film obtained by cutting the second long optical film while releasing the second long optical film from the second optical film roll and leaving the long second release film, is The optical axis of the first optical film and the optical axis of the second optical film are arranged at a predetermined angle to be attached to the second surface of the optical unit to be conveyed, or the single-piece second optical film is attached to The optical axis of the first optical film and the optical axis of the second optical film are arranged at a predetermined angle, and are attached to the second surface of the optical unit. A continuous manufacturing system for an optical display panel, comprising: A manufacturing apparatus for manufacturing an optical device by bonding a first optical film having at least an optical function film to a first surface of an optical unit, and bonding a second optical film having at least an optical function film to a second surface of the optical unit. Display panel; and If the continuous inspection device for an optical display panel according to any one of claims 6 to 10, Among them, the manufacturing apparatus and the continuous inspection apparatus are arranged in a series of conveying apparatuses for conveying the optical unit and the optical display panel. The continuous manufacturing system of the optical display panel according to claim 13, wherein the aforementioned manufacturing device is: The monolithic first optical film obtained by cutting the first long optical film while unwinding the first long optical film from the first optical film roll and leaving the long first release film, and attaching it Attaching the first optical film on the first surface of the optical unit to be conveyed, or attaching a single sheet of the first optical film to the first surface of the optical unit; And / or The single optical second optical film obtained by cutting the second long optical film while releasing the second long optical film from the second optical film roll and leaving the long second release film, is The optical axis of the first optical film and the optical axis of the second optical film are arranged at a predetermined angle to be attached to the second surface of the optical unit to be conveyed, or the single-piece second optical film is attached to The optical axis of the first optical film and the optical axis of the second optical film are arranged at a predetermined angle, and are attached to the second surface of the optical unit.