JP2015184437A - Production method of patterned retardation film and production method of optical film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a patterned retardation film produced by continuous treatment on a long transparent film material supplied by use of rolls, which is configured to decrease crosstalk in an image display device caused by uneven elongation and contract of the transparent film material and to efficiently dispose the pattern retardation film.SOLUTION: A production method of a patterned retardation film is provided, in which a long transparent film material 2 is successively treated to form a patterned retardation film 1, and the method includes: a retardation layer forming step of forming a retardation layer, in which a first region to impart a retardation to transmitted light and a second region to impart a retardation different from that of the first region to the transmitted light are successively and alternately disposed, on the long transparent film material 2; and a cutting step SP7 of cutting a laminate of the retardation layer and the long transparent film material to form the patterned retardation film 1. The cutting step SP7 is carried out in such a way that an extending direction of a short side of the patterned retardation film 1 is aligned to the longitudinal direction of the transparent film material 2.

Description

  The present invention relates to a pattern retardation film according to a passive three-dimensional image display device.

  In recent years, an image display device that displays a three-dimensional image by a passive method has been provided. Here, FIG. 6 is a schematic view showing a passive type image display apparatus using a liquid crystal display panel. The passive-type image display device sequentially assigns pixels of the liquid crystal display panel that are continuous in the vertical direction or the horizontal direction (vertical direction in the example of FIG. 6) for the right eye and the left eye, respectively. Driving with the image data for the left eye, thereby displaying the image for the right eye and the image for the left eye simultaneously. In addition, a pattern retardation film is arranged on the panel surface (viewer side) of the liquid crystal display panel so that the light emitted from the right-eye pixel and the left-eye pixel is linearly polarized light having different directions for the right-eye and left-eye. Convert to As a result, in the passive method, glasses equipped with corresponding polarizing filters are worn, and a right-eye image and a left-eye image are selectively provided to the viewer's right and left eyes, respectively, and a three-dimensional image is displayed. To do.

  Therefore, in the pattern retardation film, two types of band-like regions in which the slow axis direction (direction in which the refractive index is maximized) are orthogonal to each other are sequentially formed corresponding to the setting of the pixels in the liquid crystal display panel. Thus, in the passive method, glasses equipped with corresponding polarizing filters are worn, and a right-eye image and a left-eye image are selectively provided to the viewer's right eye and left eye, respectively. Here, the slow axis direction of the adjacent band-like regions is usually a combination of +45 degrees and −45 degrees or a combination of 0 degrees and +90 degrees with respect to the horizontal direction. In the example of FIG. 6, the long side direction of the screen is shown as the horizontal direction according to the name in the normal image display device.

  This passive method can also be applied to an image display device having a slow response speed, and can display three-dimensionally with a simple configuration using a pattern retardation film and circularly polarized glasses. Note that the passive image display apparatus employs a method in which pixels that are continuous in the horizontal direction are sequentially and alternately assigned to the right eye and the left eye instead of the vertical direction in the example of FIG.

  The pattern phase difference film according to this passive method requires a pattern-like phase difference layer that gives a phase difference to transmitted light corresponding to the allocation of pixels. With respect to this pattern retardation film, Patent Document 1 discloses a method of forming a retardation layer by forming a photo-alignment layer on a glass substrate with controlled orientation regulating force and patterning the alignment of liquid crystals with this photo-alignment layer. Is disclosed. Further, Patent Document 2 discloses a method of forming an alignment layer in which a fine uneven shape is formed on the peripheral side surface of a roll plate by laser irradiation, and the uneven shape is transferred to control the alignment regulating force in a pattern shape. ing.

  In the manufacturing process of the pattern retardation film, the long transparent film material provided by the roll is sequentially processed to create a pattern retardation film. Patent Document 3 and the like include a transport direction of the long transparent film material. A method of creating a photo-alignment film while conveying a long transparent film material is disclosed by an exposure process using a mask having a plurality of slits extending in length. Further, in Patent Document 4, etc., regarding the processing of a long film material related to a so-called flexible flat display, an electrode pattern is created on the long film material by intermittently feeding the long film material and repeating the exposure process. A method is disclosed.

  In the past, image display panels in which such a pattern retardation film is used mainly have an aspect ratio of 4: 3, which is a numerical ratio of the width and height of a display screen (effective display screen). In recent years, however, most have an aspect ratio of 16: 9. In the image display panel, the size of the display screen is represented by the length of the diagonal line in inches. Thus, at 42 inches with an aspect ratio of 16: 9, the effective display screen is 93 cm wide and 52.3 cm long, and at 100 inches with an aspect ratio of 16: 9, the effective display screen is 221.40 cm wide and 124.50 cm long. It becomes. Incidentally, when the aspect ratio is 4: 3, the effective display screen is 93.5 cm wide and 70.1 cm long for 46 inches. Accordingly, the pattern retardation film is produced in a horizontally long shape in which the size of the so-called frame portion is added to the size of the corresponding effective display screen according to the inch size of the image display panel to be used. Here, the frame is an area having a black frame shape surrounding the effective display area in the image display panel.

  By the way, in the manufacturing process of this type of optical film, a long transparent film material provided by a roll is sequentially processed to produce a desired optical film, and this long transparent film material is uneven due to heat, stress, etc. Cannot be completely prevented. In addition, the sequential processing of the long transparent film material related to the creation of this optical film is performed by applying a coating liquid to ensure the function of the optical film, heating and drying the applied coating liquid, and irradiating with ultraviolet rays. It is. Moreover, in this type of optical film, the main stress on the long transparent film material is, for example, long in order to apply and dry the coating liquid at the most suitable position in each manufacturing process, and to perform ultraviolet irradiation. This tension is constantly applied to the transparent film, and is larger at the end in the width direction of the long transparent film material than at the center in the width direction of the long transparent film material. As a result, in the manufacturing process of this type of optical film, the length in the longitudinal direction of the long transparent film material provided by the roll is longer at the end in the width direction than at the center, and is long and transparent. Waviness may occur at the end in the width direction of the film material. The pattern retardation film is produced so that the longitudinal direction of the long transparent film material is the extension direction of the long side, and such undulation occurs on the long side of the pattern retardation film.

  The pattern phase difference film is provided with the band-like regions for the right eye and the left eye one after another according to the pixel pitch of the image display panel, and thus various inconveniences occur when such non-uniform expansion and contraction occurs. In other words, with such a pattern retardation film, when such non-uniform expansion and contraction occurs, it becomes difficult to accurately arrange each band-like region on the image display panel, and as a result, crosstalk occurs in severe cases. become. Here, crosstalk is a phenomenon in which light emitted from the right-eye pixel and the left-eye pixel, which originally needs to be provided to the right eye and the left eye, leaks into the left eye and the right eye. In this type of image display apparatus, when the crosstalk becomes intense, the image quality is significantly deteriorated. Specifically, the stereoscopic effect of the display image is impaired due to the crosstalk, and in a case where it is remarkable, the image is perceived by the double copy. In addition, when such non-uniform expansion and contraction occurs, the margin at the time of arranging on the image display panel decreases, and it becomes difficult to efficiently arrange the pattern retardation film.

  In particular, crosstalk due to such non-uniform shrinkage and deterioration in workability related to the arrangement of the pattern retardation film become significant when the display screen becomes large, and in practice, when the length of the long side exceeds about 1 m ( The aspect ratio is 16: 9 and is 42 inches or more), the occurrence of crosstalk and the deterioration of workability become remarkable.

JP 2005-49865 A JP 2010-152296 A JP 2013-50575 A JP 2011-59307 A

  The present invention has been made in view of such a situation, and relates to a pattern retardation film produced by continuous processing of a long transparent film material provided by a roll. Crosstalk caused by the above is reduced, and furthermore, a pattern retardation film can be arranged efficiently.

  The present inventor has conducted extensive research to solve the above problems, and sets the direction in which the short side of the pattern retardation film extends to be the longitudinal direction of the long transparent film material that is the base material. This led to the completion of the present invention.

(1) In the manufacturing method of the pattern phase difference film which processes sequentially while conveying a long transparent film material and creates a pattern phase difference film,
A phase-difference layer in which a first region for imparting a phase difference to transmitted light and a second region for imparting a phase difference different from the first region to transmitted light are alternately provided in the long transparent Creating a retardation layer to be formed on the film material;
Cutting the laminate of the retardation layer and the long transparent film material to create the pattern retardation film,
The cutting step includes
The laminate is cut so that the extending direction of the short side of the pattern retardation film is the longitudinal direction of the long transparent film material.

  According to (1), in the case of producing a patterned retardation film by sequentially processing a long transparent film material by an alignment film creating step, a retardation layer creating step, etc., the direction in which the long side of the pattern retardation film extends Compared with the case where is the longitudinal direction of the long transparent film material, the area of the portion where the undulation occurs in the pattern retardation film can be reduced. Therefore, compared with the case where the direction in which the long side of the pattern retardation film extends is the longitudinal direction of the substrate, crosstalk due to non-uniform expansion and contraction of the long transparent film material is reduced. It can arrange efficiently.

(2) In (1),
After creating a photo-alignment material layer to be used for creating an orientation layer in the long transparent film material, the photo-alignment material layer is subjected to an exposure process to create an orientation layer,
The step of creating the retardation layer includes
A liquid crystal material is aligned by the alignment regulating force of the alignment layer to create the retardation layer,
The alignment layer creating step includes
A mask layer is formed by rotary screen printing and subjected to an exposure process, whereby a portion corresponding to the first or second region is selectively exposed to form the alignment layer.

  According to (2), even when the first and second regions extend in the width direction of the long transparent film material, the extending direction of the short side of the pattern retardation film is the longitudinal direction of the long transparent film material. Can be set to be

(3) In (1),
After creating a photo-alignment material layer to be used for creating an orientation layer in the long transparent film material, the photo-alignment material layer is subjected to an exposure process to create an orientation layer,
The step of creating the retardation layer includes
A liquid crystal material is aligned by the alignment regulating force of the alignment layer to create the retardation layer,
The alignment layer creating step includes
The alignment layer is created by selectively exposing a portion corresponding to the first or second region by an exposure process using a mask,
The exposure process is repeated using the mask while intermittently transporting the long transparent film material.

  According to (3), even when the first and second regions extend in the width direction of the long transparent film material, the extending direction of the short side of the pattern retardation film is the longitudinal direction of the long transparent film material. Can be set to be

  The present invention relates to a pattern retardation film produced by continuous processing of a long long transparent film material provided by a roll, and reduces crosstalk due to uneven stretching of the long transparent film material, Can efficiently make the pattern retardation film. In particular, such crosstalk due to uneven stretching of the long transparent film material becomes significant when the screen size exceeds 42 inches. Therefore, the present invention can reduce crosstalk due to non-uniform expansion and contraction of the long transparent film material, and can efficiently arrange the pattern retardation film, particularly for an image display device panel having a large screen of 42 inches or more. it can.

It is a figure where it uses for description of the pattern phase difference film which concerns on 1st Embodiment of this invention. It is a flowchart which shows the manufacturing process of the pattern phase difference film of FIG. It is a figure where it uses for description of the exposure process of the pattern phase difference film of FIG. It is a figure where it uses for description of the cutting process which concerns on 1st Embodiment. It is a figure where it uses for description of the exposure process and cutting process which concern on 2nd Embodiment. It is a figure where it uses for description of the three-dimensional image display by a passive system.

[First Embodiment]
FIG. 1 is a diagram showing a pattern retardation film applied to the image display device according to the first embodiment of the present invention. In the image display device according to the first embodiment, the pixels of the liquid crystal display panel that are continuous in the vertical direction (the left-right direction is the corresponding direction in FIG. 1) sequentially and alternately display the right-eye image. The pixels are assigned to the left-eye pixels for displaying the left-eye image and the left-eye image, and are driven by the right-eye and left-eye image data, respectively. As a result, the image display device alternately divides the display screen into a band-like region for displaying an image for the right eye and a band-like region for displaying an image for the left eye, and the image for the right eye and the image for the left eye are divided. Display at the same time. In this image display device, a pattern phase difference film 1 is disposed on the panel surface (viewer side surface) of the liquid crystal display panel, and the pattern phase difference film 1 corresponds to light emitted from right-eye and left-eye pixels, respectively. To give the phase difference. Thereby, this image display apparatus displays a desired three-dimensional image by a passive method.

  Here, the pattern retardation film 1 has an alignment layer 3, a retardation layer 4, and a sensitivity on one surface of a base material 2 made of a long transparent film material such as TAC (triacetyl cellulose), acrylic, or cycloolefin polymer. A pressure-sensitive adhesive layer 5 and a separator film 6 are sequentially provided. The pattern retardation film 1 is peeled off the separator film 6 to expose the pressure-sensitive adhesive layer 5, and is then attached to the linear polarizing plate according to the liquid crystal display panel by the pressure-sensitive adhesive layer 5. Thereafter, the pattern retardation film is disposed on the panel surface of the image display panel by being attached to the panel surface of the image display panel integrally with the linear polarizing plate. Although various transparent film materials can be widely applied to the base material 2, it is preferable to apply a TAC film material that is excellent in optical isotropy and excellent in optical characteristics. For the pressure-sensitive adhesive layer 5, various pressure-sensitive adhesives used for bonding of this type of optical film, such as an acrylic pressure-sensitive adhesive, can be applied. In this embodiment, the separator film 6 is a transparent film having a small orientation so as not to hinder the inspection of optical characteristics (defects) by transmitted light in a subsequent process. More specifically, a polyethylene film, a PET (Polyethylene terephthalate) film, or the like can be applied.

  In the pattern retardation film 1, a retardation layer 4 is formed of a liquid crystal material that is solidified (cured) while maintaining refractive index anisotropy, and the alignment of the liquid crystal material is patterned by the alignment regulating force of the alignment layer 3. To do. In FIG. 1, the orientation of the liquid crystal molecules is exaggerated by an elongated ellipse. By this patterning, the pattern retardation film 1 has a certain width corresponding to the pixel assignment in the liquid crystal display panel, and the right eye region (first region) A and the left eye region (second region). And B), which are successively formed in a band shape, give phase differences corresponding to light emitted from the right-eye and left-eye pixels, respectively.

  In the pattern retardation film 1, after the photo-alignment material layer is formed of the photo-alignment material, the photo-alignment material layer is irradiated with ultraviolet rays by linearly polarized light, thereby forming the alignment layer 3 by applying the photo-alignment technique. Is done. Here, the ultraviolet light applied to the photo-alignment material layer is set so that the direction of polarization differs between the right-eye region A and the left-eye region B by 90 degrees, and thereby the liquid crystal material provided in the retardation layer 4 , The liquid crystal molecules are aligned in the corresponding directions in the region A for the right eye and the region B for the left eye, and a phase difference corresponding to the transmitted light is given. In addition, although various materials to which the photo-alignment technique can be applied can be applied as the photo-alignment material, in this embodiment, the alignment is not changed by ultraviolet irradiation after the alignment, for example, a light dimerization type. Use materials. The light dimerization type material is described in “M. Schadt, K. Schmitt, V. Kozinkov and V. Chigrinov: Jpn. J. Appl. Phys., 31, 2155 (1992)”, “M. Schadt, H. Seiberle and A. Schuster: Nature, 381, 212 (1996), etc., and is already commercially available, for example, under the trade name “ROP-103” (Rolic technologies Ltd.).

  Furthermore, in this embodiment, the anti-reflection layer 7 and the protective film 8 are sequentially provided on the other surface of the substrate 2 in the pattern retardation film 1. Here, the antireflection layer 7 has a contrast by reducing the whitishness by applying an antiglare hard coat layer for preventing visibility deterioration due to reflection of external light and a so-called clear antireflection surface material. In this embodiment, transparency is ensured, the reflectance is reduced, and a high-quality image is displayed.

  The protective film 8 is disposed in order to prevent the pattern retardation film 1 from being damaged in the production process, the conveyance process, and the like. In this embodiment, the protective film 8 is transparent and has a small orientation so as not to hinder the inspection of optical characteristics (defects) by transmitted light in a subsequent process. More specifically, a polyethylene film, a PET (Polyethylene terephthalate) film, or the like can be applied.

(Retardation layer)
The retardation layer 4 contains a polymerizable liquid crystal composition. This polymerizable liquid crystal composition can contain an antiblocking agent and the like in addition to a liquid crystal compound exhibiting liquid crystallinity and having a polymerizable functional group in the molecule (hereinafter also referred to as “rod-like compound”).

  The rod-shaped compound has a refractive index anisotropy, and has a function of imparting a desired phase difference by arranging regularly by the alignment regulating force of the alignment layer 3. Examples of the rod-like compound include materials exhibiting a liquid crystal phase such as a nematic phase and a smectic phase, but the nematic phase is easier to arrange regularly than liquid crystal compounds exhibiting other liquid crystal phases. It is more preferable to use the rod-shaped compound shown.

  Specific examples of the rod-shaped compound used in the present embodiment include compounds represented by the following formulas (1) to (16).

〔Manufacturing process〕
FIG. 2 is a flowchart showing manufacturing steps of the pattern retardation film 1. The manufacturing process of the pattern phase difference film 1 produces a pattern phase difference film by sequentially processing the long transparent film material by the processing step shown in FIG. Here, in this production process, the base material 2 is provided by a long transparent film material wound up on a roll, and the antiglare hard coat is applied to the base material 2 by the surface treatment of the base material 2 in the antireflection layer creation process SP2. The antireflection layer 7 is formed by sequentially forming a layer and a low reflection layer. In the low reflection layer, various configurations relating to the antiglare hard coat layer and the low reflection layer can be widely applied. In the manufacturing process, the base material formed with the antireflection layer in this way is once wound around a roll and supplied to the next process. The substrate 2 is provided by a roll having a width of 1300 mm and a length of 2000 m, for example.

  In the manufacturing process, in the subsequent alignment layer creation process SP3 related to the next process, the coating liquid related to the light distribution film is applied by a die or the like, and then dried and baked, whereby the photo-alignment material layer is manufactured. Subsequently, in this alignment layer creation step SP3, a photo-alignment layer is formed by irradiating ultraviolet rays in the exposure step. Here, in the exposure process, after selectively exposing the region corresponding to the right-eye region or the left-eye region by irradiating the ultraviolet light with the linearly polarized light using the mask, the ultraviolet light due to the linearly polarized light whose polarization direction is orthogonal to the entire surface. It is executed by irradiating.

  Subsequently, in the manufacturing step SP4 of the retardation layer, the liquid crystal material coating liquid is applied and dried with a die or the like, and then the liquid crystal material is cured by irradiation with ultraviolet rays, whereby the retardation layer 4 is manufactured. Is done. In the manufacturing process, the protective film 8 is arranged in the subsequent protective film arrangement process SP5. In the subsequent pressure-sensitive adhesive layer creation step SP6, the pressure-sensitive adhesive layer 5 and the separator film 6 are disposed. Further, in the subsequent cutting step SP7, the pattern retardation film 1 is produced by cutting into a desired size. As described above, the substrate 2 is provided with a width of 1300 mm, and in the cutting step SP7, depending on the inch size of the pattern retardation film to be produced, after dividing the substrate 2 in the width direction, Cut out to a desired size, thereby producing a pattern retardation film by so-called multiple chamfering. In this manufacturing process, defects, appearance, and the like are inspected in the subsequent inspection process SP8.

  The pattern retardation film 1 is then peeled off from the separator film and attached to the linear polarizing plate by the pressure-sensitive adhesive layer 5, thereby creating an optical film in which the pattern retardation film 1 and the linear polarizing plate are laminated. The image display device is configured such that the optical film is arranged on the panel surface of the image display panel so that three-dimensional display is possible.

  FIG. 3 is a diagram showing details of the exposure process. This manufacturing process is performed by irradiating ultraviolet rays (polarized ultraviolet rays) by linearly polarized light through a mask 16 that shields a portion corresponding to the region A for the right eye or the region B for the light eye. In the left eye region B or the right eye region A, the photo-alignment material film is oriented in a desired direction (FIG. 3A). Thereby, this manufacturing process executes the first exposure process. Subsequently, this manufacturing process irradiates the entire surface with ultraviolet rays by linearly polarized light having a polarization direction different from that of the first exposure process by 90 degrees, and thereby the unexposed right-eye area A or left-eye area B in the first exposure process. Then, the photo-alignment material film is oriented in a desired direction in the region A for the right eye or the region B for the left eye (FIG. 4B). Thus, in this manufacturing process, the alignment layer 3 is produced by sequentially exposing the right eye region A and the left eye region B by two exposure processes.

  In the manufacturing process described above, the pattern retardation film 1 is formed by sequentially processing the substrate 2 made of the long transparent film material provided by the rolls, and the stress, heat, and the like in the process of transporting. Uneven expansion and contraction occurs in the substrate 2, and as a result, waviness may occur at the end of the substrate 2 in the width direction.

  Therefore, in this embodiment, as shown in FIG. 4B, the extending direction of the short side of the pattern retardation film 1 is set to be the longitudinal direction of the substrate 2. Here, waviness due to non-uniform shrinkage of the base material 2 occurs at the end in the width direction of the base material 2 so that the direction in which the short side of the pattern retardation film extends becomes the longitudinal direction of the base material. If set, compared to the case where the direction in which the long side of the pattern retardation film extends is the longitudinal direction of the substrate (shown by FIG. 4A), The area can be reduced. Therefore, compared with the case where the direction in which the long side of the pattern retardation film extends is the longitudinal direction of the substrate, crosstalk due to non-uniform expansion and contraction of the long transparent film material is reduced. It can arrange efficiently.

  Therefore, in this embodiment, as shown in FIG. 4B, an alignment layer and a retardation layer are formed so that the right eye region and the left eye region extend in the width direction of the substrate 2, and in the cutting step SP7, The pattern 2 is cut so that the width direction of the substrate 2 is the longitudinal direction of the pattern retardation film 1, and the direction in which the short side of the pattern retardation film 1 extends is the longitudinal direction of the substrate. Create a retardation film.

  More specifically, in this embodiment, a mask layer is formed on the surface of the photo-alignment material layer by rotary screen printing, and the first exposure process is performed to selectively select the right eye region or the left eye region. Exposure process. Subsequently, the mask layer is removed and the entire surface is exposed by a second exposure process. For this reason, the mask layer is produced by repeating the light-shielding portion extending in the width direction of the base material 2, and this mask layer constitutes the mask 16 described above with reference to FIG. Further, the rotary screen printing is a screen printing which is executed by producing a screen with a cylindrical shape and placing a squeegee inside the screen.

  In this embodiment, by setting the direction in which the short side of the pattern retardation film extends to be the longitudinal direction of the long transparent film material that is the base material, Crosstalk due to non-uniform expansion and contraction is reduced, and more efficient placement is possible. In particular, crosstalk due to non-uniform expansion and contraction of the long transparent film material becomes significant when the screen size exceeds 42 inches. Therefore, the present invention can reduce crosstalk due to non-uniform expansion and contraction of the long transparent film material, and can efficiently arrange the pattern retardation film, particularly for an image display device panel having a large screen of 42 inches or more. it can.

[Second Embodiment]
In this embodiment, as shown in FIG. 5, the base material 2 is intermittently fed, and the exposure process using the mask 16 held so as to face the base material 2 is repeated, whereby the width direction of the base material 2 is changed. Exposure processing is performed so as to be in the extending direction of the right eye region and the left eye region. This embodiment has the same configuration as that of the first embodiment except that the configuration related to the exposure process is different.

  That is, in this embodiment, in the first exposure process using the mask in the exposure process of the alignment film creating process SP3, the manufacturing process is intermittently performed on the basis of the length of the short side of the pattern retardation film 1 as a unit. 2 is transported. Further, in synchronism with the intermittent conveyance of the base material 2, the emission of ultraviolet rays from the light source to the mask 16 is temporarily stopped and thereby the exposure process using the mask is repeated. The mask 16 related to the first exposure process is created by repeating the slit S extending in the width direction of the base material 2 in a direction perpendicular to the extending direction of the slit S, and faces the base material 2 to be intermittently fed. Thus, it arrange | positions in proximity to the base material 2. FIG. Further, after executing the first exposure process in this way, the entire surface is irradiated with ultraviolet rays by the second exposure process. Thereby, a manufacturing process exposes the base material 2 so that the area | region for right eyes and the area | region for left eyes of the pattern phase difference film 1 may extend in the width direction of the base material 2. FIG.

  In the manufacturing process, after subsequently producing a retardation layer or the like, in the cutting step SP7, the substrate 2 is cut so that the width direction of the substrate 2 is the longitudinal direction of the pattern retardation film 1, whereby the pattern retardation film 1 A pattern retardation film is created so that the direction in which the short side extends is the longitudinal direction of the substrate.

[Other Embodiments]
The specific configuration suitable for the implementation of the present invention has been described in detail above, but the present invention can be variously combined or modified with the configuration of the above-described embodiment without departing from the spirit of the present invention. .

  That is, in the above-described embodiment, the case where the first exposure process is performed using the mask and then the entire surface is irradiated with the ultraviolet rays in the second exposure process is described. However, the present invention is not limited to this, and the first process is performed. In the case where the entire surface is irradiated with ultraviolet rays in this exposure process and then exposed using a mask in the second exposure process, the present invention can be widely applied to the case where the mask is used in both the first and second exposure processes. be able to. When the entire surface is irradiated with ultraviolet rays in the first exposure process and then exposed using a mask in the second exposure process, the alignment layer 3 is a material whose orientation direction changes each time due to repeated exposure processes. Applies. As such a material, for example, a photoisomerization reaction type photo-alignment material can be used. The photoisomerization is reported in “W.M. Gibbons, P.J.Shannon, S.T. Sun and B.J. Swetlin: Nature, 351, 49 (1991)”.

  In the above-described embodiment, when the mask layer is formed by rotary screen printing and the exposure process is performed, the case where the substrate is conveyed by intermittent feeding and the exposure process is repeated by the mask is described, but the present invention is not limited to this. In the exposure processing method, various methods can be widely applied, for example, when exposure processing is performed while transporting a mask in synchronization with transport of a substrate.

  In the above-described embodiment, the case where the adhesive layer and the separator film are provided on the pattern retardation film has been described. However, the present invention is not limited to this, and the linear polarizing plate or the pattern may be used when bonded to the linear polarizing plate. The present invention can be widely applied to cases where an adhesive layer is provided on a retardation film.

  In the above-described embodiment, the case where the alignment layer is formed using the photo-alignment layer has been described. However, the present invention is not limited to this, and the present invention can be widely applied to the case where the alignment layer is formed by forming a rubbing treatment mark. Can do.

DESCRIPTION OF SYMBOLS 1 Pattern phase difference film 2 Base material 3 Orientation layer 4 Phase difference layer 5 Adhesive layer 6 Separator film 7 Antireflection layer 8 Protective film 16 Mask

Claims (3)

In the manufacturing method of the pattern phase difference film that creates a pattern phase difference film by sequentially processing while conveying the long transparent film material,
A phase-difference layer in which a first region for imparting a phase difference to transmitted light and a second region for imparting a phase difference different from the first region to transmitted light are alternately provided in the long transparent Creating a retardation layer to be formed on the film material;
Cutting the laminate of the retardation layer and the long transparent film material to create the pattern retardation film,
The cutting step includes
The manufacturing method of the pattern phase difference film which cut | disconnects the said laminated body so that the extension direction of the short side of the said pattern phase difference film may turn into the longitudinal direction of the said long transparent film material. After creating a photo-alignment material layer to be used for creating an orientation layer in the long transparent film material, the photo-alignment material layer is subjected to an exposure process to create an orientation layer,
The step of creating the retardation layer includes
A liquid crystal material is aligned by the alignment regulating force of the alignment layer to create the retardation layer,
The alignment layer creating step includes
The pattern position according to claim 1, wherein the alignment layer is created by selectively exposing a portion corresponding to the first or second region by creating a mask layer by rotary screen printing and performing an exposure process. A method for producing a phase difference film. After creating a photo-alignment material layer to be used for creating an orientation layer in the long transparent film material, the photo-alignment material layer is subjected to an exposure process to create an orientation layer,
The step of creating the retardation layer includes
A liquid crystal material is aligned by the alignment regulating force of the alignment layer to create the retardation layer,
The alignment layer creating step includes
The alignment layer is created by selectively exposing a portion corresponding to the first or second region by an exposure process using a mask,
The manufacturing method of the pattern phase difference film of Claim 1. The exposure process is repeated using the said mask, conveying the said elongate transparent film material intermittently.

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