JP2014178460A - Patterned phase difference film and image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce lines corresponding to a region setup of a patterned phase difference film, which shows up when viewing two-dimensional images on a passive-type image display device.SOLUTION: A patterned phase difference film 2 includes a transparent base material 12 and a phase difference layer 1, which gives a phase difference to transmitted light, laminated together. The phase difference layer 1 comprises first and second regions A, B alternately arrayed in sequence to give different phase differences to transmitted light. The patterned phase difference film 2 has an adjacent member 14 which is located next to the phase difference layer 1 and has a refractive index that is between a refractive index in a slow axis direction of the phase difference layer 1 and a refractive index in a fast axis direction of the phase difference layer 1.

Description

The present invention relates to a three-dimensional image display by a passive method.

  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, as the slow axis direction of the adjacent band-like region, a combination of +45 degrees and −45 degrees, or 0 degrees and +90 degrees with respect to the horizontal direction is usually employed. 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. Patent Document 2 discloses a method of forming a photo-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. Has been.

  By the way, when viewing a two-dimensional image in an image display device that displays a three-dimensional image by a passive method, streaks may be seen on the display screen. In order to view a two-dimensional image related to the streak, the image display panel is driven by image data for displaying a two-dimensional image to display the two-dimensional image, and this display is not worn with circularly polarized glasses for displaying the three-dimensional image. This is the case of viewing with In the pattern retardation film, this streak is a region corresponding to the light output from the pixel for the right eye (hereinafter referred to as the region for the right eye) and the light output from the pixel for the left eye. In a region to which a phase difference is applied (hereinafter referred to as a left eye region), the screen is observed with different colors and different brightness. It is desirable to reduce as much as possible in the streaks relating to such color and brightness.

  In the passive type image display device, generation of various stripes including the stripes related to the color and light and dark is widely known. Specifically, when displaying a three-dimensional image, even lines and odd lines are assigned to the right eye and the left eye, respectively, so that in principle, streaks relating to the right eye region and the left eye region can be seen. However, the above-described color and light / dark lines are generated when viewing a two-dimensional image, which is different from the basic lines in the passive image display apparatus.

JP 2005-49865 A JP 2010-152296 A

  The present invention has been made in view of such circumstances, and in a passive image display device, it is possible to reduce streaks corresponding to setting of regions in a pattern retardation film when viewing a two-dimensional image. An object of the present invention is to provide a pattern retardation film and an image display device.

  The inventor has conducted extensive research to solve the above-mentioned problems, and has the idea that the difference in reflectance due to the difference between the refractive index in the fast axis direction and the refractive index in the slow axis direction of the retardation layer is alleviated. As a result, the present invention has been completed.

(1) In a patterned retardation film in which a transparent substrate and a retardation layer that imparts retardation to transmitted light are laminated,
The retardation layer is
First and second regions having different phase differences given to transmitted light are alternately provided,
The pattern retardation film is
The refractive index of the adjacent member adjacent to the retardation layer is maintained at a refractive index between the refractive index in the slow axis direction and the refractive index in the fast axis direction of the retardation layer.

  According to (1), it is possible to reduce the difference in the reflectance generated at the interface with the adjacent member between the transmitted light related to the polarization plane in the slow axis direction and the transmitted light related to the polarization plane in the fast axis direction. This can reduce the light and dark lines corresponding to the setting of the region in the pattern retardation film by the reflected light.

(2) In (1),
The adjacent member is an adhesive.

  According to (2), the density streak corresponding to the setting of the region in the pattern retardation film can be reduced by effectively utilizing the configuration of the pattern retardation film.

(3) In (1),
The adjacent member is a polymerizable liquid crystal cured in an isotropic state.

  According to (3), it is possible to reduce the density stripe corresponding to the setting of the region in the pattern retardation film by providing the adjacent member using the material for forming the retardation layer.

(4) In (1),
The adjacent member is a C plate.

  According to (4), it is possible to improve the viewing angle characteristics and the like by reducing the density streaks with the C plate.

(5) In (1),
The adjacent member is an alignment layer that regulates the alignment of the liquid crystal in the retardation layer.

  According to (5), the density streak corresponding to the setting of the region in the pattern retardation film can be reduced by effectively utilizing the configuration of the pattern retardation film.

  (6) An image display device in which the pattern retardation film according to any one of (1), (2), (3), (4), and (5) is disposed on the panel surface of the image display panel.

  According to (6), it is possible to provide an image display device in which streaks corresponding to the setting of regions in the pattern retardation film are reduced.

  In the passive image display device, it is possible to reduce streaks corresponding to the setting of the region in the pattern retardation film when viewing a two-dimensional image.

It is a figure which shows the confirmation result of the stripe in the image display apparatus by a passive system. It is a figure where it uses for description of a light and dark stripe. It is a figure where it uses for description of the reduction method of a light / dark stripe. It is a figure which shows the image display apparatus which concerns on 1st Embodiment of this invention. It is a figure which shows the image display apparatus which concerns on 3rd Embodiment of this invention. It is a figure where it uses for description of the three-dimensional image display by a passive system.

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

[Principle prevention principle]
FIG. 1 shows a two-dimensional image displayed in a passive type image display device, the display is photographed with a camera in front of the screen, and visually observed, and the color corresponding to the setting of the area in the pattern retardation film, It is the result of confirming streaks related to light and dark. Here, FPR indicates the slow axis direction in the right-eye region and the left-eye region in the pattern retardation film, and is an angle based on the extension direction of the right-eye region and the left-eye region. The polarizing plate indicates the transmission axis direction of the linear polarizing plate provided on the image display panel on the incident surface side of the pattern retardation film corresponding to the setting of the pattern retardation film.

  In this confirmation result, when the transmission axis direction of the polarizing plate is set to 0 degree or 90 degrees, the result (still image) photographed by the camera cannot detect the streak, but it is yellow in visual observation. Streaks were visible. However, a yellow streak is determined to be dependent on the human eye by being detected only by visual inspection. On the other hand, when the transmission axis direction of the polarizing plate was set to 45 degrees, dark and light streaks were confirmed both by the camera and visually. As a result, the dark and light stripes are apparently caused by a change in the amount of light from the pattern retardation film by being confirmed by both the camera and the visual observation.

  When the change in the amount of light was examined, it was found that this was due to the difference in reflectance due to the difference between the refractive index in the fast axis direction and the refractive index in the slow axis direction in the retardation layer.

  That is, FIG. 2 is a diagram for explaining the difference in reflectance. In FIG. 2, it is assumed that external light such as sunlight is incident on the pattern retardation film 2 through the linearly polarizing plate 3A. In FIG. 2, the transmission axis direction of the linearly polarizing plate 3A is indicated by an arrow, and the linearly polarizing plate 3A has a transmission axis direction that is oblique with respect to the extending direction of the strip regions A and B formed in the pattern retardation film 2. It is assumed to be in the direction of degrees. In FIG. 2, the liquid crystal molecules in the retardation layer 1 are indicated by ellipses, and the alignment direction is indicated by the major axis direction. In the retardation layer 1, the regions A and B are provided so that the slow axis directions are orthogonal.

  FIG. 2 is for explaining a phenomenon that occurs when polarized external light enters the pattern retardation film 2. For this reason, the linearly polarizing plate 3 </ b> A is disposed on the incident surface of the pattern retardation film 2 so that it can be easily understood. Here, in general, it can be said that it is extremely rare for light to enter the pattern retardation film 2 through the linear polarizing plate. However, the transmitted light and the reflected light incident obliquely on the interface are polarized because the transmittance of the s wave and the p wave is different at the interface. As a result, when external light is incident obliquely on the panel surface of the image display device, the transmitted light of the external light is polarized. Sunlight is also polarized. Therefore, the example of FIG. 2 is an example in the case where the polarization of the outside light is extreme.

  In such an arrangement, as indicated by an arrow a, linearly polarized light polarized in the fast axis direction of one region B is incident on the pattern retardation film 2, but in the other region A, this extraneous light Is the slow axis direction. The liquid crystals constituting the retardation layer 1 have different refractive indexes in the slow axis direction and the fast axis direction, and the refractive index ns in the slow axis direction and the refractive index nf in the fast axis direction are ns> nf. Here, the refractive index ns in the slow axis direction and the refractive index nf in the fast axis direction are set to 1.6 and 1.5, and reflection at the interface with air (refractive index 1) is considered.

When light is incident on a medium having a refractive index n1 from a medium having a refractive index n1, the reflectance R at the interface is represented by R = (n1−n2) ² / (n1 + n2) ² (1). When calculation is performed by applying ns = 1.6 and nf = 1.5 to this relational expression, the reflectances R are 5.3% and 4.0%, respectively. As a result, when such extraneous light by linearly polarized light is incident, the reflectances of the regions A and B are different, and accordingly, the amount of reflected light is different between the regions A and B.

  FIG. 2 shows a case where external light by linearly polarized light that is polarized in an oblique 45 ° direction is incident on the extending direction of the region in the pattern retardation film, but in an opposite direction to the oblique −45 ° direction. Even if the light is polarized, a difference in the reflectance similarly occurs. On the other hand, in FIG. 2, when the external light is polarized in the extending direction of each region in the pattern retardation film, or is polarized in a direction orthogonal thereto, there is a difference in reflectance between the regions A and B. Will not occur. In other cases, streaks are visible, although not as much as in the case of polarization in the ± 45 ° direction. Therefore, the example of FIG. 2 is an example of an extreme case where the external light is completely polarized and the streak is most visible.

  In the case of extraneous light, although it is very rare to be incident by such linearly polarized light, it is reflected and incident on various parts to enter the image display device. Such a difference in the amount of reflected light between the regions A and B due to the linearly polarized light can be generally applied to the extraneous light, and as a result, dark and light streaks can be seen. The extraneous light transmitted through the phase difference layer 1 is reflected by the linear polarizing plate or the like directly below it and reenters the phase difference layer 1, and this extraneous extraneous light is also affected by the reflectance.

  Therefore, as shown in FIG. 3 in comparison with FIG. 2, both sides of the phase difference layer 1 or one surface is in close contact with the phase difference layer 1 to reduce the difference in reflection in the regions A and B. A control layer 4 is provided. Here, the refractive index control layer 4 does not have optical anisotropy in the in-plane direction, and the refractive index is the refractive index ns of the retardation layer 1 in the slow axis direction and the refractive index nf in the fast axis direction. The refractive index between.

  Now consider the interface with air, as described above for FIG. The refractive index ns in the slow axis direction and the refractive index nf in the fast axis direction of the retardation layer 1 are set to 1.6 and 1.5, and the refractive index of the refractive index control layer 4 is set to an intermediate refractive index of 1.55. Suppose that

  In this case, the extraneous light is reflected at the interface between the air and the refractive index control layer 4, and in this case, the reflection by applying the formula (1) with n1 and n2 being 1.0 and 1.55. The rate is 4.7%. In this case, the reflection of extraneous light due to the reflectance of 4.7% occurs in the areas A and B in common. This extraneous light passes through the refractive index control layer 4 and enters the regions A and B, respectively. When the extraneous light is polarized in the fast axis direction or the slow axis direction of the region A, the region A and The reflection at B will be different. However, in this case, when substituting n1 = 1.55 and n2 = 1.6 into the equation (1), the reflectance becomes 0.025%. Similarly, n1 = 1.55 and n2 = 1.5. When substituting and calculating, the reflectance is 0.027%. Accordingly, the difference in reflectance between the regions A and B in the case where the refractive index control layer 4 is not provided is 1.3% (5.3% -4.0%) is 0.002% (0.027% -0). 0.025%), and as a result, it is possible to make the dark and light streaks invisible.

  More specifically, the refractive index ns1 in the slow axis direction and the refractive index nf1 (ns1> nf1) in the fast axis direction in the right eye region (first region) A, and the left eye region (second region) B in the fast eye direction. For the refractive index ns2 in the slow axis direction and the refractive index nf2 in the fast axis direction (ns2> nf2), the refractive index no of the refractive index control layer 4 is ns1> no> nf2 and ns2> no> By setting it to be nf1, light and dark stripes can be reduced.

  When the same material is applied to the regions A and B and the slow axis directions are set to be orthogonal to each other in the regions A and B, ns1 = ns2 and nf1 = nf2, so that ns1 (= ns2> The density stripe can be reduced by no> nf1 (= nf2).

  The refractive index no of the refractive index control layer 4 is desirably no = (ns + nf) / 2, and the light and dark stripes can be reduced most efficiently.

  Note that a material having optical anisotropy can be applied to the refractive index control layer. However, in this case, it is necessary that the in-plane refractive index satisfies the above relationship. Here, the in-plane refractive index is a refractive index when viewed from the front. When the in-plane refractive index has anisotropy, it is necessary that the refractive indexes in the fast axis direction and the slow axis direction satisfy the above relationship.

[First Embodiment]
FIG. 5 is a diagram showing an image display apparatus according to the first embodiment of the present invention. The image display apparatus 10 according to the first embodiment includes a two-dimensional image display mode and a three-dimensional image display mode, and provides a three-dimensional image by a passive method in the three-dimensional image display mode. In other words, in this three-dimensional image display mode, the image display device 10 sequentially alternates pixels that are continuous in the vertical direction of the image display panel 11 that is a liquid crystal display panel (the left-right direction is the corresponding direction in FIG. 1). The right-eye pixel for displaying the right-eye image and the left-eye pixel for displaying the left-eye image are allocated and driven by the right-eye and left-eye image data, respectively. As a result, the image display apparatus 10 alternately divides the display screen into a band-like area A that displays an image for the right eye and a band-like area B that displays an image for the left eye, and the image for the right eye and the image for the left eye are displayed. Display images simultaneously. In this image display device 10, the pattern phase difference film 2 is disposed on the panel surface of the image display panel 11, and the phase difference film 2 generates phase differences corresponding to light emitted from the right-eye and left-eye pixels, respectively. give. Thereby, this image display apparatus displays a desired three-dimensional image by a passive method.

  In contrast, in the two-dimensional image display mode, the image display panel is driven by continuous image data to display a two-dimensional image.

  Here, the pattern retardation film 2 is formed on one surface (side surface of the image display panel 11) of the transparent substrate 12 made of a transparent film such as TAC (triacetyl cellulose), the alignment layer 13, the retardation layer 1, and the adhesive. Layer 14 is produced sequentially. In the pattern retardation film 2, the retardation layer 1 is formed of a liquid crystal material, and the alignment of the liquid crystal material is patterned by the alignment regulating force of the alignment layer 13. By this patterning, the pattern phase difference film 2 is formed in a band shape alternately with the right-eye area A and the left-eye area B sequentially with a certain width corresponding to the pixel assignment in the liquid crystal display panel. A phase difference corresponding to each of the light emitted from the right-eye and left-eye pixels is given.

  In the pattern retardation film 2, after the photo-alignment material layer is formed on the substrate 12 by the photo-alignment material, the photo-alignment material layer is irradiated with ultraviolet rays by linearly polarized light, thereby applying the photo-alignment technique. An alignment layer 13 is formed. 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 (see FIG. 3). With respect to the liquid crystal material to be obtained, 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.).

  Instead of selectively exposing the right eye region or the left eye region in this way and then exposing the entire surface to produce an alignment layer, on the contrary, after the entire surface exposure processing, the right eye region or The alignment layer may be produced by selectively exposing the left eye region, or after selectively exposing the right eye region or the left eye region, the unexposed left eye region or the right eye region is selectively used. The alignment layer may be prepared by performing an exposure treatment. Further, instead of preparing the alignment layer by a photo-alignment technique, the alignment layer may be manufactured by forming a fine uneven shape by a rubbing process trace by a forming process.

  After the pattern liquid retardation film 2 is applied with a liquid crystal material coating liquid for the retardation layer 1, the retardation layer 1 is produced by irradiation with ultraviolet rays. Subsequently, the pattern retardation film 2 is provided with a separator film (not shown) after the pressure-sensitive adhesive layer 14 is produced. The pattern retardation film 2 is peeled off from the separator film to expose the pressure-sensitive adhesive layer 14, and then adhered and held on the panel surface of the image display panel 11 by the pressure-sensitive adhesive layer 14.

  In this embodiment, an acrylic pressure-sensitive adhesive is applied to the pressure-sensitive adhesive layer 14 that is a member adjacent to the phase difference layer 1, and the refractive index is adjusted by adding an additive to slow the phase difference layer 1. The refractive index between the refractive index in the phase axis direction and the refractive index in the fast axis direction is maintained, thereby causing the pressure-sensitive adhesive layer 14 to function as the refractive index control layer 4, and the retardation layer 1 and the pressure-sensitive adhesive layer 14. The difference in reflectance between regions A and B occurring at the interface with the The material applied to the adjacent member is not limited to acrylic, and various materials such as epoxy can be applied. Moreover, since the acrylic adhesive resin has a refractive index of 1.46 to 1.47, a material for increasing the refractive index may be added as necessary to adjust the refractive index. As a method for adjusting the refractive index, the methods disclosed in JP2012-246455, JP2009-120726, JP2008-208281, and the like can be widely applied.

  In this embodiment, the refractive index of the pressure-sensitive adhesive layer 14 in contact with the retardation layer 1 is set to a refractive index between the refractive index in the slow axis direction and the refractive index in the fast axis direction of the retardation layer 1, By causing the pressure-sensitive adhesive layer 14 to function as the refractive index control layer 4, it is possible to effectively utilize the configuration of the pattern retardation film and to reduce streaks corresponding to the setting of regions in the pattern retardation film.

[Second Embodiment]
In this embodiment, in the configuration of FIG. 4, the refractive index of the alignment layer 13 is changed to the refractive index in the slow axis direction of the retardation layer 1 by further selecting the material of the alignment layer 13 that is an adjacent member of the retardation layer 1. And the refractive index between the refractive index in the fast axis direction. The configuration is the same as that of the first embodiment except that the configuration related to the alignment layer 13 is different.

  Accordingly, in this embodiment, the alignment layer 13 also functions as a refractive index control layer, and the difference in reflectance between the regions A and B generated at the interface between the alignment layer 13 and the retardation layer 1 is reduced.

  In this embodiment, the refractive index of the alignment layer 13 in contact with the retardation layer 1 is set to a refractive index between the refractive index in the slow axis direction and the refractive index in the fast axis direction of the retardation layer 1, and this alignment By causing the layer 13 to also function as a refractive index control layer, it is possible to effectively reduce the streak corresponding to the setting of the region in the pattern retardation film by effectively using the configuration of the pattern retardation film.

[Third Embodiment]
FIG. 5 is a diagram showing an image display device 20 according to the third embodiment of the present invention in comparison with FIG. The image display device 20 is configured in the same manner as the first embodiment or the second embodiment except that a pattern retardation film 22 is provided instead of the pattern retardation film 2. The pattern retardation film 22 is the first embodiment or the second embodiment except that the refractive index control layer 4 is separately provided as an adjacent member of the retardation layer 1 between the adhesive layer 24 and the retardation layer 1. The same configuration as the embodiment.

  Here, the refractive index control layer 4 is composed of a polymerizable liquid crystal cured in an isotropic state, and the refractive index is between the refractive index in the slow axis direction and the refractive index in the fast axis direction of the retardation layer 1. Refractive index is maintained. Specifically, in this embodiment, the coating liquid applied to the phase difference layer 1 is applied and dried, and then cured by irradiation with ultraviolet rays in a state where the coating liquid is heated to a temperature higher than the isotropic phase. . The pattern retardation film 22 is then provided with an adhesive layer 24.

  In this embodiment, even if a refractive index control layer is separately provided, the same effect as in the first or second embodiment can be obtained. Moreover, the width | variety of the material selection applied to the adhesive layer 24 can be expanded, and the adhesive layer suitable for the function of a pattern phase difference film can be applied.

  Further, by forming this refractive index control layer using the material of the retardation layer, it is possible to effectively avoid an increase in the number of manufactured parts and obtain the same effects as those of the first and second embodiments.

[Fourth Embodiment]
This embodiment has the same configuration as that of the third embodiment except that the C plate is applied to the refractive index control layer. Here, the in-plane refractive index of the C plate is maintained at a refractive index between the refractive index in the slow axis direction and the refractive index in the fast axis direction of the retardation layer 1.

  Even if the refractive index control layer is provided by the C plate as in this embodiment, the same effect as in the third embodiment can be obtained. In this case, viewing angle characteristics and the like can be improved by the C plate.

[Fifth Embodiment]
This embodiment has the same configuration as that of the fourth embodiment except that the transparent resin layer is applied to the refractive index control layer instead of the C plate. Here, the in-plane refractive index of the transparent resin layer is maintained at a refractive index between the refractive index in the slow axis direction and the refractive index in the fast axis direction of the retardation layer 1.

  Even if the refractive index control layer is provided by the transparent resin layer as in this embodiment, the same effect as in the third embodiment can be obtained.

Other Embodiment
The specific configuration suitable for the implementation of the present invention has been described in detail above. However, 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. Can do.

  That is, in the above-described embodiment, the case where the alignment layer is provided has been described. However, the present invention is not limited to this, and the alignment layer is omitted by applying the transfer method to the retardation layer on the substrate. May be. In the transfer method, for example, when a desired layer is formed on a base material, the layer is not directly formed on the base material, but can be peeled once on a releasable support. After forming the transfer body by laminating the layers, the layer formed on the support is finally bonded to the substrate (transferred substrate) on which the layer is to be laminated according to the process, demand, etc. In this method, a desired layer is formed on the substrate by laminating and then peeling off and removing the support. Further, the alignment layer may be omitted by applying a liquid crystal polymer to the retardation layer.

  In this case, when the alignment layer is omitted, the refractive index of the base material is set to a refractive index between the refractive index in the slow axis direction and the refractive index in the fast axis direction of the retardation layer. Thus, the base material itself may function as a refractive index control layer. Alternatively, a refractive index control layer may be provided between the base material and the retardation layer by applying the same method as described above for the third to fifth embodiments.

  Moreover, although the case where it arrange | positions to the image display panel by a liquid crystal display panel was described in the above-mentioned embodiment, this invention is not restricted to this, When arrange | positioning to the image display panel by an organic EL element, the image display panel by a plasma display, etc. Can also be widely applied.

  Further, in the above-described embodiment, the case of preventing dark and light streaks has been described. However, the present invention is not limited to this, and in combination with a configuration for preventing yellow streaks, both yellow and light and dark streaks cannot be perceived. May be.

DESCRIPTION OF SYMBOLS 1 Phase difference layer 2, 22 Pattern phase difference film 3 Linearly polarizing plate 4 Refractive index control layer 10, 20 Image display apparatus 11 Image display panel 12 Base material 13 Orientation layer 14, 24 Adhesive layer

Claims (6)

In a pattern retardation film in which a transparent substrate and a retardation layer that imparts a retardation to transmitted light are laminated,
The retardation layer is
First and second regions having different phase differences given to transmitted light are alternately provided,
The pattern retardation film is
A patterned retardation film in which the refractive index of an adjacent member adjacent to the retardation layer is maintained at a refractive index between the refractive index in the slow axis direction and the refractive index in the fast axis direction of the retardation layer. The pattern retardation film according to claim 1, wherein the adjacent member is an adhesive. The pattern retardation film according to claim 1, wherein the adjacent member is a polymerizable liquid crystal cured in an isotropic state. The pattern retardation film according to claim 1, wherein the adjacent member is a C plate. The patterned retardation film according to claim 1, wherein the adjacent member is an alignment layer that regulates alignment of liquid crystal in the retardation layer. An image display device in which the pattern retardation film according to any one of claims 1, 2, 3, 4, and 5 is disposed on a panel surface of an image display panel.

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