JP6660040B2 - Image display device - Google Patents

Description

  The present invention can be applied to, for example, an antireflection film formed by laminating a linear polarizing plate and a half-wave retardation layer.

  Conventionally, various optical films having a retardation layer made of a liquid crystal material have been proposed and used in various ways. Specifically, for example, for an image display device, an antireflection film, which is an optical film made of a circularly polarizing plate, is disposed on a panel surface (viewer side surface) of the image display panel, and the reflection of extraneous light is reduced by the antireflection film. A method has been proposed.

  This antireflection film is formed by laminating a linear polarizing plate and a quarter-wave plate, and converts the external light directed to the panel surface of the image display panel into linearly polarized light by the linear polarizing plate, and then converts the light by the quarter-wave plate to a circular shape. Convert to polarized light. Here, the external light due to the circularly polarized light is reflected on the surface of the image display panel or the like, but the direction of rotation of the polarization plane is reversed at the time of the reflection. As a result, the reflected light is converted into linearly polarized light in the direction of being shielded by the linear polarizing plate by the quarter-wave plate, and then shielded by the subsequent linear polarizing plate. Emission to the outside is significantly suppressed.

  Conventionally, a retardation film including a retardation layer made of a liquid crystal material has been produced as a retardation plate such as a quarter-wave plate. That is, such a retardation film is prepared by forming an alignment layer on the surface of a substrate made of a transparent film material, and then coating, drying, and curing a coating liquid relating to the retardation layer, thereby controlling the alignment of the alignment layer. The liquid crystal material is solidified in a state where the liquid crystal material is aligned by a force, thereby producing a retardation layer. The retardation layer imparts a desired retardation to the transmitted light.

  It is considered that the entire thickness of an optical film such as an antireflection film can be reduced by producing the film by a so-called transfer method. Here, the transfer method means that, for example, when a desired layer is formed on a base material or the like, this layer is not directly formed on the base material or the like, but is temporarily formed on a release support. After the transfer layer is formed by laminating and forming the layers in a peelable manner, the layer formed on the support is replaced with a substrate or the like on which the layer is to be finally laminated (transfer On the base material and the like (Patent Literatures 1 to 4).

  That is, for example, when the transfer method is applied to an antireflection film using a circularly polarizing plate, a transfer film in which a support substrate, an alignment layer, and a retardation layer are sequentially laminated is prepared, and the retardation layer is on the linear polarizing plate side. After attaching the transfer film to the linear polarizing plate as described above, the support substrate is peeled off. Thereby, the thickness of the support base material can be reduced, and an antireflection film can be produced using a circularly polarizing plate.

  However, when the support base material is peeled off, in the conventional transfer film, the support base material peels off at the interface between the retardation layer and the alignment layer, and as a result, the phase difference layer is exposed after the transfer. As a result, the conventional antireflection film or the like has a problem that the retardation layer is easily damaged in the production process. In the antireflection film, if the retardation layer is damaged, a desired retardation cannot be imparted to the transmitted light by the retardation layer at the damaged portion, so that the antireflection function is locally impaired and optical characteristics deteriorate. Will do.

JP 2005-309290 A JP 2006-323349 A JP 2005-309290 A JP 2006-323349 A

  The present invention has been made in view of such a situation, and an object of the present invention is to reduce damage to a retardation layer in an optical film produced by transferring the retardation layer by a transfer method.

  The present inventors have conducted intensive studies to solve the above problems, and after curing the retardation layer by irradiation of ultraviolet rays from the coating layer side, the reaction of the retardation layer by irradiation of ultraviolet rays from the substrate side. The present invention was completed, and the present invention was completed.

  Specifically, the present invention provides the following.

(1) a support substrate;
An orientation layer provided on the support substrate,
A retardation layer provided on the alignment layer, for imparting a retardation to transmitted light,
The retardation layer,
In infrared spectroscopy spectrum, an IR peak Peak (810 cm ^-1) ratio of 810 cm ^-1 to IR peak of 830cm ^-1 Peak (830cm ^-1) IR peak ratio ^{Peak (810cm -1) / Peak (} 830cm -1 ) Is 0.51 or less.

According to (1), since the IR peak ratio Peak (810 cm ^-1 ) / Peak (830 cm ^-1 ) is 0.51 or less, the orientation layer has a smaller thickness than the adhesion between the orientation layer and the support substrate. And the adhesion between the layer and the retardation layer can be increased. Thus, when the support substrate is peeled by the transfer method, the peel interface can be used as the interface between the support substrate and the alignment layer, and the retardation layer and the alignment layer can be transferred integrally. As a result, in the subsequent steps, the alignment layer functions as a protective layer for the retardation layer, and damage to the retardation layer can be reduced.

(2) In an optical film having a retardation layer for imparting a retardation to transmitted light,
The retardation layer,
A substrate made of a transparent film material, provided at least via an optical functional layer,
An orientation layer is provided on the side opposite to the base material,
The retardation layer,
In infrared spectroscopy spectrum, an IR peak Peak (810 cm ^-1) ratio of 810 cm ^-1 to IR peak of 830cm ^-1 Peak (830cm ^-1) IR peak ratio ^{Peak (810cm -1) / Peak (} 830cm -1 ) Is 0.51 or less.

  According to (2), the retardation layer can be transferred integrally with the alignment layer by a transfer method, and this alignment layer can function as a protective layer of the retardation layer, thereby reducing damage to the retardation layer. it can.

(3) In (2),
The optical functional layer,
An optical film that is an optical functional layer that functions as a linear polarizing plate.

  According to (3), an optical film obtained by transferring a retardation layer and an alignment layer to a linear polarizing plate by a transfer method can be provided.

(4) an alignment layer forming step of forming an alignment layer on the support base material;
On the alignment layer, a coating liquid of the retardation layer is applied and dried to form a coating layer of the retardation layer, and then the coating layer of the retardation layer is cured to form the coating layer. And a step of producing a retardation layer for producing a retardation layer,
The step of producing the retardation layer,
A pre-curing step of irradiating ultraviolet rays from the coating layer side of the retardation layer to cure the coating layer of the retardation layer,
A post-curing step of irradiating the support substrate side with ultraviolet rays to cure the coating layer of the retardation layer, following the pre-curing step.

  According to (4), after the pre-curing step, a post-curing step of irradiating ultraviolet rays from the support base material side to cure the coating layer of the retardation layer is provided, whereby the reaction of the retardation layer is sufficiently performed. The adhesion between the alignment layer and the retardation layer can be increased as compared with the adhesion between the alignment layer and the support substrate. Thus, when the support substrate is peeled by the transfer method, the peel interface can be used as the interface between the support substrate and the alignment layer, and the retardation layer and the alignment layer can be transferred integrally. As a result, in the step after the transfer, the alignment layer can function as a protective layer for the retardation layer, and damage to the retardation layer can be reduced.

(5) In (4),
The step of manufacturing the retardation layer,
By the irradiation of the ultraviolet rays in the post-curing step,
In infrared spectroscopy spectrum, an IR peak Peak (810 cm ^-1) ratio of 810 cm ^-1 to IR peak of 830cm ^-1 Peak (830cm ^-1) IR peak ratio ^{Peak (810cm -1) / Peak (} 830cm -1 ) Is 0.51 or less, the method for producing a transfer film forming the retardation layer.

According to (5), when the IR peak ratio Peak (810 cm ^-1 ) / Peak (830 cm ^-1 ) is 0.51 or less, more specifically, the ratio of the IR layer to the adhesion between the alignment layer and the support base material is reduced. As a result, the adhesion between the alignment layer and the retardation layer can be increased.

(6) a step of preparing a transfer film by laminating a support substrate, an alignment layer, and a retardation layer;
The receiving body, by a transfer method, comprising a step of preparing an optical film to arrange the retardation layer of the transfer film and the alignment layer integrally,
The step of preparing the transfer film,
An alignment layer forming step of forming the alignment layer on the support substrate,
On the alignment layer, after preparing a coating layer of the retardation layer by applying and drying the coating liquid of the retardation layer, the coating layer of the retardation layer is cured and cured. And a step of producing a retardation layer for producing a retardation layer,
The step of producing the retardation layer,
A pre-curing step of irradiating ultraviolet rays from the coating layer side of the retardation layer to cure the coating layer of the retardation layer,
A post-curing step of irradiating ultraviolet rays from the support base material side to cure the coating layer of the retardation layer, following the pre-curing step.

  According to (6), after the pre-curing step, a post-curing step of irradiating ultraviolet rays from the support base material side to cure the coating layer of the retardation layer is provided, whereby the reaction of the retardation layer is sufficiently performed. The adhesion between the alignment layer and the retardation layer can be increased as compared with the adhesion between the alignment layer and the support substrate. Thus, when the support substrate is peeled by the transfer method, the peel interface can be used as the interface between the support substrate and the alignment layer, and the retardation layer and the alignment layer can be transferred integrally. As a result, in the step after the transfer, the alignment layer can function as a protective layer for the retardation layer, and damage to the retardation layer can be reduced.

(7) In (6),
The step of producing the retardation layer,
By the irradiation of the ultraviolet rays in the post-curing step,
In infrared spectroscopy spectrum, an IR peak Peak (810 cm ^-1) ratio of 810 cm ^-1 to IR peak of 830cm ^-1 Peak (830cm ^-1) IR peak ratio ^{Peak (810cm -1) / Peak (} 830cm -1 ) Is 0.51 or less, the method for producing an optical film forming the retardation layer.

  According to (7), when the IR peak ratio Peak (810 cm -1) / Peak (830 cm -1) is 0.51 or less, the IR peak ratio is more specifically compared to the adhesion between the alignment layer and the support substrate. As a result, the adhesion between the alignment layer and the retardation layer can be increased.

  ADVANTAGE OF THE INVENTION According to this invention, the damage of a phase difference layer can be reduced about the optical film produced by transferring a phase difference layer by a transfer method.

1 is a diagram illustrating an image display device according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a transfer film according to the image display device of FIG. 1. FIG. 3 is a diagram illustrating a manufacturing process of the transfer film of FIG. 2. FIG. 2 is a diagram illustrating a process of manufacturing an antireflection film according to the image display device of FIG. 1. FIG. 3 is a diagram for explaining an IR peak ratio. It is a figure provided for explanation of a measurement condition.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
[Image display device and optical components]
FIG. 1 is a diagram showing an image display device according to the first embodiment of the present invention. In the image display device 11, an antireflection film 13 for preventing reflection by a function of a circularly polarizing plate is disposed on a panel surface (viewer side surface) of the image display panel 12. Here, the image display panel 12 is, for example, an organic EL panel, and displays a desired color image. Note that the image display panel 12 is not limited to an organic EL panel, and various image display panels such as a liquid crystal display panel can be widely applied.

  The anti-reflection film 13 is adhered to and held on the panel surface of the image display panel 12 by an adhesive layer 14 made of PSA (PRESuResitive Adhesive) adhesive. The anti-reflection film 13 is configured by laminating and integrating a linear polarizing plate 15 and a 波長 wavelength plate 16 with an adhesive layer 18 made of PSA adhesive. The anti-reflection film 13 may be arranged with another adhesive or adhesive instead of the PSA adhesive layer, and the linear polarizing plate 15 and the quarter-wave plate 16 may be laminated. Good. Examples of such other pressure-sensitive adhesives and adhesives include, for example, ultraviolet curable resins, thermosetting resins, and the like.

  The linear polarizing plate 15 is configured by sandwiching an optical functional layer serving as a linear polarizing plate between a pair of substrates. Here, the base material is a transparent film of TAC (triacetylcellulose), poly (methyl) acrylate, poly (butyl) acrylate, methyl (meth) acrylate-butyl (meth) acrylate copolymer, A resin such as an acrylic resin such as a methyl (meth) acrylate-styrene copolymer, a glass such as a soda glass, a potassium glass, a lead glass, and a quartz glass can be used. The optical functional layer is produced by, for example, adsorbing and orienting iodine compound molecules on a film material made of polyvinyl alcohol (PVA).

  The 波長 wavelength plate 16 is formed by the retardation layer 19. In this embodiment, the retardation layer 19 is transferred from a transfer film to be described later integrally with the alignment layer 22 by a transfer method and arranged. Thus, the antireflection film 13 is protected by the alignment layer 22 so that the retardation layer 19 is not exposed, and damage to the retardation layer 19 during the production process is reduced as compared with the related art.

[Transfer film]
FIG. 2 is a view showing a transfer film used for producing the antireflection film 13. This transfer film 20 is provided with an alignment layer 22 and a retardation layer 19 on a support base material 21. The antireflection film 13 is formed by laminating the retardation layer 19 provided on the transfer film 20 and the alignment layer 22 on the linear polarizing plate 15 by a transfer method.

  Here, as the support base material 21, various transparent film materials such as a TAC film can be used, but in this embodiment, an adhesion strengthening treatment such as a corona treatment for improving the adhesion strength with the alignment layer 22 is performed. A transparent film material made of PET (polyethylene terephthalate) resin, which has not been subjected to anything, is applied.

  The phase difference layer 19 is formed by curing the transfer film 20 in a state where the liquid crystal material related to the phase difference layer 19 is aligned by the alignment regulating force of the alignment layer 22. As the alignment layer 22, various configurations capable of aligning the liquid crystal material of the retardation layer 19 can be applied, but in this embodiment, an optical alignment layer is applied. As a result, the transfer film 20 is coated with the coating liquid for the photo-alignment layer and dried to form a material layer for the photo-alignment layer on the substrate 21, and then the alignment layer 22 is irradiated by linearly polarized ultraviolet light. Is formed. As the material for the photo-alignment layer, various materials to which a photo-alignment method can be applied can be used, but in this embodiment, for example, a light dimerization type material is used. The photo-dimerization type materials are described in “M. Schadt, K. Schmitt, V. Kozinkov and V. Chig Reinov: Jpn. J. Appl. Phys., 31, 155 (1992)”, “M. Schadt, H. Seibelele and A. SchusterRe: NatuRe, 381, 212 (1996) ”.

The phase difference layer 19 is applied (cured) with a corresponding coating liquid, dried, and then cured by irradiation with ultraviolet light, so that the liquid crystal material is solidified (cured) in a state where the liquid crystal material is oriented by the orientation regulating force of the orientation layer 22. It is made. Retardation layer 19, 810 cm by proceeding sufficiently reaction sufficiently irradiated with ultraviolet rays according to this curing, infrared spectroscopy in (IR) spectrum, to IR peak Peak (830 cm ^-1) of 830 cm ^{-1 - 1} of the IR peak peak (810 cm ^-1) IR peak ratio is the ratio ^{peak (810cm -1) / peak (} 830cm -1) is set to be 0.51 or less. The measurement of the IR peak ratio Peak (810 cm ^-1 ) / Peak (830 cm ^-1 ) is performed by the ATR (total reflection attenuation) method using, for example, FT-IR-610 manufactured by JASCO Corporation. Is measured.

Here, the IR peak at 830 cm ^{−1 is} an IR peak derived from p-substituted benzene that does not disappear in the reaction by ultraviolet irradiation, and the IR peak at 810 cm ⁻¹ is an IR peak derived from CＣC that disappears in the reaction by ultraviolet irradiation. There, in this way this type of coating layer to be subjected to production of the phase difference layer 19, as the reaction proceeds, gradually the value of the IR peak ratio ^{peak (810cm -1) / peak (} 830cm -1) becomes small.

Here, in the transfer film 20, when the IR peak ratio Peak (810 cm ⁻¹ ) / Peak (830 cm ⁻¹ ) of the retardation layer 19 is 0.52 or more, the adhesion force between the alignment layer 22 and the support base material 21. As a result, when the support base material 21 is peeled off, the interface between the alignment layer 22 and the retardation layer 19 becomes a peeling interface. Therefore, in this case, the transfer of the retardation layer 19 to the linear polarizing plate 15 causes the alignment layer 22 to be peeled off from the retardation layer 19 integrally with the support base material 21, leaving the retardation layer 19 exposed.

On the other hand, when the reaction of the retardation layer 19 progresses beyond a certain level, and the IR peak ratio Peak (810 cm ⁻¹ ) / Peak (830 cm ⁻¹ ) becomes 0.51 or less, the orientation layer 22 and the support base material 21 are not separated. When the adhesive force between the alignment layer 22 and the retardation layer 19 becomes larger than the adhesive force and the support substrate 21 is peeled off, the interface between the alignment layer 22 and the support substrate 21 becomes a peel interface. . Thereby, in this case, the alignment layer 22 is transferred to the linear polarizing plate 15 integrally with the retardation layer 19 by transferring the retardation layer 19 to the linear polarizing plate 15. By making the layer 22 function as a protective layer of the retardation layer 19, the retardation layer 19 can be protected by the alignment layer 22. Thereby, in this embodiment, in the manufacturing process of the antireflection film 13, damage to the retardation layer 19 can be reduced.

Due to this, a change in the adhesion between the support base material 21 and the alignment layer 22 causes the separation interface when the support base material 21 is separated from the interface between the support base material 21 and the alignment layer 22 to be aligned with the alignment layer 22. At the interface with the phase difference layer 19. However, when a PET film that has not been subjected to an adhesion strengthening treatment for enhancing the adhesion to the alignment layer 22 is applied to the support substrate 21, when various materials are applied to the alignment layer 22, the phase difference Even when various materials are applied to the layer 19, by setting the IR peak ratio Peak (810 cm ^-1 ) / Peak (830 cm ^-1 ) to 0.51 or less, the alignment layer 22 and the support base material 21 can be used. Can be used as a peeling interface.

  For the retardation layer 19, various polymerizable liquid crystal compositions which are liquid crystal materials exhibiting optical anisotropy can be applied. Here, the polymerizable liquid crystal composition exhibits liquid crystallinity and can contain an antiblocking agent and the like in addition to a liquid crystal compound having a polymerizable functional group in a molecule (hereinafter, also referred to as a “rod compound”). .

  The rod-shaped compound according to the retardation layer 19 has a refractive index anisotropy, and has a function of imparting a desired retardation by being regularly arranged by the alignment regulating force of the alignment layer 22. As the rod-like compound, for example, a material exhibiting a liquid crystal phase such as a nematic phase or a smectic phase may be mentioned.However, the nematic phase is easier to arrange regularly than a liquid crystal compound exhibiting another liquid crystal phase. It is more preferable to use the rod-shaped compound shown.

  Specific examples of the rod-shaped compound used in the present embodiment include, for example, compounds represented by the following formulas (1) to (13), and these compounds can be polymerized and used.

（ｇは２〜５の整数）

(G is an integer of 2 to 5)

〔Manufacturing process〕
The transfer film 20 is provided with a substrate 21 in the form of a long film wound on a roll. After the substrate 21 is pulled out from the roll and conveyed, the alignment layer 22 and the retardation layer 19 are sequentially formed. And transported to an optical film manufacturing process.

  FIG. 3 is a diagram illustrating a manufacturing process of the transfer film 20. In the manufacturing process 30, the base material 21 is provided by the roll 31, the base material 21 is conveyed while being pulled out from the roll 31, and the coating liquid for the alignment layer 22 is applied by the die 32. Subsequently, in the drying device 33, after the applied coating liquid is dried, the coating liquid is cured by irradiation of ultraviolet light with linearly polarized light from the light source 34, thereby forming the alignment layer 22.

  Subsequently, in the manufacturing process 30, after the coating liquid for the retardation layer 19 is applied on the alignment layer 22 by the die 35, the coating liquid is dried by the drying device 36. Subsequently, in the pre-curing step, the liquid crystal material is irradiated with ultraviolet rays from the light source 37 to thereby cure the liquid crystal material in a state where the liquid crystal material is aligned by the alignment regulating force of the alignment layer 22, thereby producing the retardation layer 19. Here, the irradiation of the ultraviolet rays is performed from the coating surface side of the coating liquid relating to the retardation layer 19, whereby the coating layer is efficiently irradiated with the ultraviolet rays to produce the retardation layer 19. The application of the coating liquid for the alignment layer and the retardation layer is not limited to the application using a die, and various methods can be widely applied.

In this embodiment, a post-curing step is provided for producing the retardation layer 19 in this manner and further performing additional irradiation of ultraviolet rays for promoting the reaction of the retardation layer 19. However, according to the results of various experiments, simply irradiating ultraviolet rays from the coating surface side by adding an ultraviolet irradiation step does not proceed more than a certain amount, and the IR peak ratio Peak (810 cm-1) / Peak ( 830 cm ^-1 ) did not decrease to 0.52 or less. This is considered to be due to the influence of the ultraviolet absorber contained in the retardation layer 19. Therefore, in this embodiment, a light source 38 is provided on the support base material 21 side, and the reaction of the retardation layer 19 is advanced by irradiation of ultraviolet light from the support base material 21 side.

  In the manufacturing process 30, the transfer film 20 in the form of a long film produced in this manner is wound around a roll 39 and transported to a process of integrating with a linear polarizing plate.

  FIG. 4 is a diagram illustrating a process of integrating with a linear polarizing plate. In this manufacturing process, the transfer film 20 is provided by the roll 39. Further, the linear polarizing plate 15 is supplied by the roll 42 in a state where the adhesive layer 18 and the release film 41 made of the PET film are arranged. In this manufacturing process, the peeling film 41 is peeled by the peeling roll 43 while the laminate of the linear polarizing plate 15, the adhesive layer 18, and the peeling film 41 is pulled out from the roll 42, and the peeled peeling film 41 is wound around the roll 44. Also, while pulling out the transfer film 20 from the roll 39, the release film 41 is peeled off and the linear polarizing plate 15 and the adhesive layer 18 are laminated, and then pressed by the pressure roll 45, whereby the transfer film 20 and the linear polarizing plate 15 are pressed. , Forming a laminate of the adhesive layer 18. Further, the base material 21 is peeled off by a subsequent peeling roll 46 and wound up around a roll 47, thereby forming a laminated body of the linear polarizing plate 15, the adhesive layer 18, the retardation layer 19, and the alignment layer 22, and the antireflection film 13 is formed. Then, the antireflection film 13 is wound around a roll 48. In the manufacturing process of the antireflection film 13, after the adhesive layer 14 and the separator film are arranged, the antireflection film 13 is cut into a desired size.

FIG. 5 is a measurement result showing a change in the IR peak ratio Peak (810 cm ⁻¹ ) / Peak (830 cm ⁻¹ ) due to the irradiation of the additional ultraviolet rays in the post-curing step. As shown in FIG. 6, after the linear polarizing plate 15 and the transfer film were laminated and integrated via the adhesive layer 18, the support base material 21 and the alignment layer 22 were peeled off, and the retardation layer 19 was removed. This is the result of measurement using the surface of No. as a measurement surface. Note that, when the support base material 21 was peeled off and the alignment layer 22 remained on the retardation layer 19 side, the alignment layer 22 was removed by etching to expose the surface of the retardation layer 19, and this was used as a measurement surface. The measurement of the IR peak ratio Peak (810 cm ⁻¹ ) / Peak (830 cm ⁻¹ ) was performed by ATR (total reflection attenuation) using FT-IR-610 manufactured by JASCO Corporation.

Here, as the support base material 21, a PET film having a thickness of 100 μm, which has not been subjected to any adhesion strengthening treatment, was applied. The alignment layer 22 was prepared by applying a corresponding coating liquid to a dry film thickness of 200 μm, drying it with hot air at 120 ° C., and irradiating linearly polarized ultraviolet light with a light quantity of 20 mJ / cm ² . The coating liquid for the alignment layer 22 was prepared using a PGME solvent to have a solid content of 4.5%. The retardation layer 19 was prepared by applying a corresponding coating liquid to a dry film thickness of 1 μm, drying with hot air at 90 ° C., and irradiating ultraviolet rays for pre-curing with a light amount of 450 mJ / cm ² . . The coating liquid for the retardation layer 19 was prepared with a mixed solvent of MEK: MIBK = 1: 1 so that the solid content became 25%.

Reference numeral L21 is a measurement result when additional ultraviolet irradiation is performed from the support base material 21 side, and reference numeral L19 is a measurement result when additional ultraviolet irradiation is performed from the retardation layer 19 side. Unirradiated is IR peak ratio in the case of not executing the ultraviolet irradiation by adding ^{Peak (810cm -1) / Peak (} 830cm -1), in this case, IR peak ratio ^{Peak (810cm -1) / Peak (} 830cm -1 ) Is 0.565, whereby the UV retardation of the retardation layer 19 by UV irradiation from the coated surface proceeds until the IR peak ratio Peak (810 cm ^-1 ) / Peak (830 cm ^-1 ) becomes 0.565. Will be. In this unirradiated sample, the peeling interface was the interface between the alignment layer 22 and the retardation layer 19.

Figure in the measurement result 5, the transfer film the IR peak ratio ^{Peak (810cm -1) / (Peak} (830cm -1) is 0.565, the amount of light ^{250mJ / cm 2, 500mJ / cm} 2, 750mJ / cm 2 When the additional ultraviolet irradiation is performed by irradiating the ultraviolet rays from the coating layer side and the support base material 21 side, the IR peak ratio is gradually increased even when the ultraviolet light is irradiated from any side due to an increase in the amount of ultraviolet irradiation. ^{peak (810cm -1) / peak (} 830cm -1) is reduced. However, when irradiated with ultraviolet light from the phase difference layer 19 side, the light amount is more than ^{500mJ / cm 2, 750mJ / cm} 2, IR peak ratio peak ( The change of 810 cm ^-1 / Peak (830 cm ^-1 ) is decreased, and the saturation characteristic is observed in the change of the IR peak ratio Peak (810 cm ^-1 ) / Peak (830 cm ^-1 ), whereby the phase difference layer 19 side is obtained. case of irradiation with ultraviolet rays, IR peak ratio peak (810 cm ^-1) Reducing Peak to (830 cm ^-1) to 0.51 or less is determined to be difficult.

On the other hand, when irradiating ultraviolet rays from the support base material 21 side, the IR peak ratio Peak (810 cm ⁻¹ ) / Peak (830 cm ⁻¹ ) decreases in proportion to the amount of irradiation, thereby making it simple and easy. The IR peak ratio Peak (810 cm ⁻¹ ) / Peak (830 cm ⁻¹ ) can be efficiently reduced to 0.51 or less.

Here, in each sample having an IR peak ratio Peak (810 cm ⁻¹ ) / Peak (830 cm ⁻¹ ) of 0.52 or more, the peeling interface is the interface between the retardation layer 19 and the alignment layer 22. When the IR peak ratio Peak (810 cm ^-1 ) / Peak (830 cm ^-1 ) is 0.52 or more, when the support base material 21 is peeled, the alignment layer 22 is also peeled off together with the support base material 21. It turns out.

On the other hand, in the sample having an IR peak ratio Peak (810 cm ^-1 ) / Peak (830 cm ^-1 ) of 0.51, the peeling interface is the interface between the alignment layer 22 and the support base material 21. When the IR peak ratio Peak (810 cm ^-1 ) / Peak (830 cm ^-1 ) is 0.51 or less, when the support base material 21 is peeled off, the alignment layer 22 is left behind on the retardation layer 19 side. Was.

[Other embodiments]
As described above, the specific configuration suitable for implementing the present invention has been described in detail. However, the present invention can be variously modified in the above-described embodiment without departing from the gist of the present invention.

  That is, in the above-described embodiment, the case where the present invention is applied to the optical film formed of the antireflection film for preventing reflection by the function of the circularly polarizing plate has been described. However, the present invention is not limited to this. The pattern retardation film and the linear polarizing plate were integrated by arranging the retardation layer according to the pattern retardation film applied to the display on the linear polarizing plate disposed on the emission surface of the liquid crystal display panel by a transfer method. An optical film in which a retardation layer relating to a retardation film for preventing a change in brightness of a display screen depending on a viewing direction by polarized sunglasses is disposed on a linear polarizing plate disposed on an emission surface of a liquid crystal display panel by a transfer method. It can be widely applied to films and the like.

DESCRIPTION OF SYMBOLS 11 Image display apparatus 12 Image display panel 13 Antireflection film 14, 18 Adhesive layer 15 Linear polarizing plate 16 1/4 wavelength plate 19 Retardation layer 20 Transfer film 21 Support base material 22 Orientation layer 30 Manufacturing process 31, 39, 42 ~ 48 roll 32,35 die 33,36 drying device 34,37,38 light source 41 release film 41-48 roll

Claims (1)

  In order in the thickness direction, at least, an optical function layer, a retardation layer, an alignment layer, and an image display panel,
  The retardation layer imparts a phase difference to the transmitted light,
  830 cm in the infrared spectroscopy spectrum ^-1 IR peak Peak (830cm ^-1 810cm for ^-1 IR peak Peak (810cm ^-1 IR peak ratio Peak (810 cm ^-1 ) / Peak (830cm ^-1 ) Is 0.51 or less
  Image display device.

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