JP2000035576A - Film of light transmission body and its manufacture, laminated film and liquid crystal display device using them - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film of a thin, light in weight, light transmission body being stuck or integrally laminated with ease, providing a large area screen and having high resolution, and a method for manufacturing the same and a laminated film and a liquid crystal display using the same. SOLUTION: A photopolymerizable mixture layer with <=1 mm thickness, composed of a composition of two or more kinds of photopolymerizable compounds having refractive indices different from each other, is provided on a supporting body substrate. Subsequently the photopolymerizable mixture layer is irradiated through a photo mask with a high-pressure mercury-vapor lamp for ultraviolet rays to selectively move two or more kinds of photopolymerizable compounds having refractive indices different from each other in accordance with the polymerization and to form a columnar structure 2 having a circular or polygonal, such as tetragonal or hexagonal cross-section, with <=100 μm columnar diameter and <=1 mm height as a highly refractive resinous region in a plurally packed state within a plane. Afterwards the full surface is irradiated with ultraviolet rays and is tripped off from the supporting body substrate to obtain a film of light transmission body 1. A laminated film or a liquid crystal display is manufactured by using the film of light transmission body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light guide film made of an organic polymer and a method for producing the same, a laminated film in which the light guide film is laminated with a polarizing plate or a light diffusion layer, and these are mounted on a liquid crystal cell. And a liquid crystal display device.

[0002]

2. Description of the Related Art Conventionally, in a reflection type color liquid crystal display device, when a reflector is disposed outside a liquid crystal cell, a parallax shift occurs. Therefore, a configuration in which a reflection electrode is formed in the liquid crystal cell has been proposed.

However, in order to prevent the terminals of the reflective electrode from being corroded or to form an efficient diffuse reflectance, the process of devising the base of the reflective electrode is complicated, and the yield rate is reduced. In addition, there is a problem that it becomes expensive.

Therefore, in order to prevent parallax displacement and to solve the above-mentioned problems, a specular reflector is attached to the outside of the liquid crystal cell on the side opposite to the observer, and the substrate itself on the observer side of the liquid crystal cell is attached to an optical fiber plate. (Japanese Patent Laid-Open No. 6-258627), or a configuration in which an optical fiber plate is mounted outside the liquid crystal cell (Japanese Patent Laid-Open No. 6-5).
No. 9254) has been proposed.

On the other hand, in a transmission type liquid crystal display device provided with an illuminating device, there is a configuration in which an optical fiber plate is mounted between a liquid crystal cell and an illuminating device for illuminating the liquid crystal cell (Japanese Patent Laid-Open No. 5-216031). Proposed.

The optical fiber plate used in these liquid crystal display devices is a GI (graded index) type quartz or resin type, and bundles optical fibers having a diameter of, for example, 0.5 mm so as to form a close-packed structure. The optical fiber is fixed with an epoxy resin or by welding, and is cut at a thickness of several mm or more on a surface perpendicular to the length direction of the optical fiber, and both surfaces are optically polished.

[0007]

In the above prior art, a parallax shift can be eliminated, a bright reflective display can be realized, or both high contrast and a wide viewing angle can be achieved, but a thick optical fiber is bundled. Therefore, there is a problem that the display resolution is reduced.

Also, the optical fiber plate should be manufactured thinly in order to cut and bundle many optical fibers.
In addition, there is a problem that it is not only difficult to manufacture a device having a large area such as a liquid crystal display device, but even if it can be manufactured, it becomes extremely expensive.

In addition, when the optical fiber plate is of a quartz type, the liquid crystal display device is thick and heavy, and when the optical fiber plate is of a resin type, there is a problem that the thickness is large. In addition, since it is thick and hard regardless of whether it is quartz or resin, it can be manufactured by bonding it to a liquid crystal cell with a roller, or laminated and integrated with an optical film such as a polarizing plate and bonded to the liquid crystal cell in the same manner. There is a problem that it is difficult to manufacture.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and it is easy to laminate or integrate, can have a large area, has a high resolution, is thin, and has a light weight. And a method for manufacturing the same. It is another object of the present invention to provide an inexpensive, thin, and lightweight liquid crystal display device capable of realizing a bright reflective display without a parallax shift and achieving both high contrast and a wide viewing angle.

[0011]

In order to achieve the above-mentioned object, a light guide film according to the first aspect of the present invention has a plurality of fine columnar structures arranged in a plane, and the columnar structure is formed of a plurality of fine columnar structures. And has a function of guiding light in the thickness direction.

According to a second aspect of the present invention, in the light guide film, a plurality of fine columnar structures are arranged in a plane close to each other, and the columnar structures have the highest refractive index at the center and the lowest refractive index at the ends. As a result, the refractive index is formed so as to change continuously, and has a function of guiding light in the thickness direction.

According to a third aspect of the present invention, in the method for producing a light guide film, light from a high-pressure mercury lamp is applied to a photopolymerizable mixture layer comprising two or more photopolymerizable compounds having different refractive indices via a photomask. By irradiating the light guide film, the light guide film according to claim 1 or 2 is manufactured.

According to a fourth aspect of the present invention, in the method for manufacturing a light guide film, light from a high-pressure mercury lamp is applied to a photopolymerizable mixture layer composed of two or more photopolymerizable compounds having different refractive indexes. A light guide film according to claim 2 is manufactured by irradiating the light through a pattern that has been subjected to a gradation process.

The method of manufacturing a light guide film according to claim 5, wherein the light interference fringes on the photopolymerizable mixture layer comprising two or more photopolymerizable compounds having different refractive indices are formed on the photopolymerizable mixture layer. A light guide film according to claim 1 or claim 2 is manufactured by irradiating light so as to intersect.

[0016] The laminated film according to the sixth aspect is the first aspect.
Alternatively, a light guide film according to claim 2 and a polarizing plate are laminated.

[0017] The laminated film according to the seventh aspect is the first aspect.
Alternatively, a light guide film according to claim 2 and a light diffusion layer are laminated.

[0018] In the liquid crystal display device according to the eighth aspect, the light guide film according to the first or second aspect or the laminated film according to the sixth or seventh aspect is mounted on the viewer side of the liquid crystal cell. It is characterized by becoming.

According to a ninth aspect of the present invention, in the liquid crystal display device, a liquid crystal cell is provided between a liquid crystal cell and an illumination device for illuminating the liquid crystal cell.
Alternatively, a light guide film according to claim 2 or a laminated film according to claim 6 or 7 is mounted.

According to the light guide film of the present invention, a plurality of fine columnar structures are arranged in a plane, and the columnar structures are formed to have a higher refractive index than other regions, and function to guide light in the thickness direction. , The area can be made larger than that of the optical fiber plate, and a thin, light one with high resolution can be obtained at low cost. In addition, if a region other than the columnar structure is colored black or the like, light leakage from a gap between adjacent columnar structures can be prevented. Moreover, since it is flexible unlike an optical fiber plate, the lamination and integration with a polarizing plate or a light diffusion layer can be performed over a large area, and the lamination film can be easily cut. Further, it can be easily bonded to a hard liquid crystal cell or the like using a roller or the like.

Further, a plurality of fine columnar structures are arranged in a plane in close proximity to each other, and the columnar structures have a refractive index continuously such that the refractive index at the center is highest and the refractive index at the ends is lowest. Since it is formed so as to be variable and has a function of guiding light in the thickness direction, it can be made larger in area than an optical fiber plate, and can obtain a thin, light, high-resolution one at low cost. Moreover, since it is flexible unlike an optical fiber plate, the lamination and integration with a polarizing plate or a light diffusion layer can be performed over a large area, and the lamination film can be easily cut. Further, it can be easily bonded to a hard liquid crystal cell or the like using a roller or the like.

According to the method for producing a light guide film of the present invention, light from a high-pressure mercury lamp is applied to a photopolymerizable mixture layer comprising two or more photopolymerizable compounds having different refractive indices via a photomask. By irradiating, the light guide film according to claim 1 or 2 is manufactured, and by utilizing the difference in the photopolymerization rate of the photopolymerizable compound, the region irradiated with ultraviolet light and the region not irradiated with ultraviolet light are used. , The distribution of the refractive index can be changed, and a plurality of fine columnar structures can be arranged in the plane. In addition, it is possible to increase the area of the optical fiber plate compared with the optical fiber plate, and to obtain a thin and light one with a high resolution at a low cost. Further, when a coloring compound such as black is used, light leakage from a gap between adjacent columnar structures can be prevented.

The photopolymerizable mixture layer composed of two or more photopolymerizable compounds having different refractive indices is irradiated with light from a high-pressure mercury lamp through a photomask whose pattern is subjected to gradation processing. By,
By producing the light guide film according to claim 2,
By utilizing the difference in the photopolymerization rate of the photopolymerizable compound, the distribution of the refractive index can be varied depending on the amount of irradiation of the ultraviolet light, and a plurality of fine columnar structures can be arranged in a close proximity in the plane. In addition, it is possible to increase the area of the optical fiber plate compared with the optical fiber plate, and to obtain a thin and light one with a high resolution at a low cost.

Further, by irradiating light to a photopolymerizable mixture layer composed of two or more photopolymerizable compounds having different refractive indices such that light interference fringes intersect on the photopolymerizable mixture layer, The light guide film according to claim 1 or 2, wherein the difference in the photopolymerization rate of the photopolymerizable compound is used to distribute the refractive index between a region irradiated with ultraviolet light and a region not irradiated with ultraviolet light. Or the distribution of the refractive index varies depending on the amount of ultraviolet irradiation, and a plurality of fine columnar structures can be arranged in the plane. In addition, it is possible to increase the area of the optical fiber plate compared with the optical fiber plate, and to obtain a thin and light one with a high resolution at a low cost. Further, when a coloring compound such as black is used, light leakage from a gap between adjacent columnar structures can be prevented.

According to the laminated film of the present invention, claim 1
Alternatively, by laminating the light guide film and the polarizing plate according to claim 2, since it is flexible unlike an optical fiber plate, lamination and integration with the polarizing plate can be performed in a large area, and cutting of the laminated film can be performed. Easy.
Further, it can be easily bonded to a hard liquid crystal cell or the like using a roller or the like.

Further, by laminating the light guide film and the light diffusion layer according to claim 1 or 2, the lamination and integration with the light diffusion layer can be performed in a large area, and the cut of the laminated film can be performed. Can be easily done. Further, it can be easily bonded to a hard liquid crystal cell or the like using a roller or the like.

According to the liquid crystal display device of the present invention, the light guide film according to claim 1 or 2 or the laminated film according to claim 6 or 7 is mounted on the viewer side of the liquid crystal cell. Accordingly, the liquid crystal display device can be made thinner and lighter and can be obtained at lower cost as compared with the case where the optical fiber plate is mounted. In particular, in the case of a color liquid crystal display device using R, G, and B color filters, there is no mixing of adjacent color filters, and the color purity can be increased.

Further, the light guide film according to claim 1 or 2, or the laminated film according to claim 6 or 7 is mounted between the liquid crystal cell and an illuminating device for illuminating the liquid crystal cell. Accordingly, the liquid crystal display device can be made thinner and lighter than the case where the optical fiber plate is mounted, and can be obtained at low cost. In particular, in the case of a color liquid crystal display device using R, G, and B color filters, there is no mixing of adjacent color filters, and the color purity can be increased.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to FIGS. Note that the present invention is not limited to the following embodiments.

(Embodiment 1) FIG. 1 is a perspective view of a light guide film according to an embodiment of the present invention. The light guide film 1 has a configuration in which a plurality of fine columnar structures 2 constituted by high refractive index regions are arranged in a plane.
FIG. 2 is a sectional view taken along line XX ′ of FIG.
FIG. 3 is a sectional view showing another example of the columnar structure 2 and a distribution state of the refractive index n.

The light guide film 1 can be manufactured, for example, as follows.

First, a composition of two or more photopolymerizable compounds having different refractive indexes is prepared. Examples of the composition of the photopolymerizable compound include a photopolymerizable composition described in JP-A-9-127331 and the like. Examples thereof include compositions comprising a combination of monomers and / or oligomers having two or more types of photopolymerizable double bonds having different refractive indices.

As a specific combination, a monomer containing 2-hydroxy-3-phenoxypropyl acrylate (refractive index 1.526), a monomer containing polyether urethane acrylate (refractive index 1.460), and a monomer containing tribromophenoxy acrylate Monomers including polyether urethane acrylate and phenoxyethyl acrylate and polyether urethane acrylate can be mentioned. It is preferable to use a photopolymerization initiator such as 2-hydroxy-2-methylpropiophen in the composition of the photopolymerizable compound.

Next, the composition is applied to a chemically and thermally stable polymer substrate such as polyethylene terephthalate or polycarbonate or a support substrate made of a glass plate by a known method, for example, a knife coater.
The photopolymerizable mixture layer is provided by applying using a method such as a roller coater, spinner, wire bar coater, wheeler or extruder and drying. If necessary, a photopolymerizable mixture layer may be provided between the pair of support substrates. The coating thickness is preferably 1 mm or less.

Next, using a high-pressure mercury lamp for ultraviolet light capable of obtaining parallel light as a light source, the above photopolymerizable mixture layer is irradiated with ultraviolet light having a wavelength of 400 nm or less through a photomask to obtain two kinds of light having different refractive indices. The above photopolymerizable compound is selectively moved along with the polymerization, and as the high refractive index region resin portion 3, the cross section is circular or polygonal such as square or hexagonal, the columnar diameter is 100 μm or less, and the height is 100 μm or less. A plurality of columnar structures 2 of 1 mm or less are formed in a plane in a state of being filled. The other regions are the low refractive index resin portions 4.

The ultraviolet irradiation may be performed in a heated state as necessary. Further, as the photomask, a pattern in which fine circles or polygons such as squares or hexagons are arranged is preferable. At this time, if gradation is applied to the pattern as necessary, as shown in FIG. 3, the refractive index gradient region resin portion 6 in which the refractive index continuously changes in the columnar structure 2, the refractive index gradient region The lowest refractive index region resin portion 5 located at the boundary between the resin portions 6 can be formed.

The refractive index distribution in the columnar structure 2 includes the molecular weight of the photopolymerizable compound, the mixing ratio, the pattern shape of the photomask,
The columnar structure 2 of a discontinuous refractive index type as shown in FIG. 2 or a gradient index type as shown in FIG. 3 can be formed by irradiation conditions of ultraviolet rays or heating conditions.

Finally, the entire surface of the support substrate is irradiated with ultraviolet rays using a high-pressure mercury lamp. Thereafter, the light guide film 1 formed on the support substrate is peeled off from the support substrate to obtain a thin, light light guide film 1 having a large area.

Hereinafter, a laminated film using the above-described light guide film 1 will be described with reference to FIGS.

As shown in FIG. 4, the laminated film of the present embodiment includes an absorption type polarizing plate 7 and a retardation
After the pressure-sensitive adhesive layer 9 is formed on the surface of the laminated layers, the above-described light guide film 1 is laminated and laminated by pressing with a roller.

If necessary, a reflection type polarizing plate may be used in place of the absorption type polarizing plate 7. Further, a plurality of retardation plates 8 may be stacked via an adhesive layer 9 as necessary.

Finally, a pressure-sensitive adhesive layer 9 is formed on the surface of the retardation plate 8, and a release paper 10 is attached to both surfaces of the laminate to obtain a laminated film. The order of lamination of these members is not limited.

As another laminated film, as shown in FIG. 5, a laminated film in which a light diffusion layer 11 is provided between the light guide film 1 and the release paper 10 is produced. The order of lamination of these members is not limited.

As a method for forming the light diffusion layer 11, a method in which a mixture of a transparent resin and glass beads having a different refractive index from the transparent resin is applied to the light guide film 1 and cured by light or heat, Alternatively, a method of applying a mixed resin in which resins having different refractive indices are non-uniformly dispersed and curing or forming into a film state and pasting them through an adhesive is appropriately employed.

Hereinafter, a reflection type color liquid crystal display device using the above-mentioned laminated film will be described with reference to FIG.

As shown in FIG. 6, in the reflection type color liquid crystal display device of this embodiment, the release paper 10 on the side of the retardation plate 8 of the laminated film shown in FIG. Is laminated on the liquid crystal cell by applying pressure with a roller on the observer side of. Thereafter, the release paper 10 on the light guide film 1 side is peeled off.

The liquid crystal cell has a reflection type STN structure, and R, G, and B color filters 14 are formed inside the liquid crystal cell corresponding to the pixels. A reflection type polarizing plate 12 and a specular reflection plate 13 are provided. Liquid crystal 15 is sealed between the pair of electrode substrates 16.

In this way, R, R
Bright and high-contrast reflective color display can be realized without mixing colors between adjacent pixels of G and B.

Hereinafter, a transmission type color liquid crystal display device using the above-mentioned laminated film will be described with reference to FIG.

As shown in FIG. 7, in the transmission type color liquid crystal display device of the present embodiment, the release paper 10 on the side of the retardation plate 8 of the laminated film shown in FIG. Then, the laminated film having the light-diffusing layer 11 is laminated on the liquid crystal cell by applying pressure with a roller so as to overlap the side opposite to the observer, that is, the lighting device side. After that, the release paper 10 on the light diffusion layer 11 side is peeled off.

The liquid crystal cell has a reflective STN structure, and R, G, and B color filters 14 are formed inside the liquid crystal cell so as to correspond to pixels, and a retardation plate is provided on the viewer side of the liquid crystal cell. 8 and an absorption type polarizing plate 7 are provided. Liquid crystal 15 is sealed between the pair of electrode substrates 16.

In this manner, the light from the edge light type illuminating device including the light source 18 composed of a cold cathode tube and the wedge-type light guide plate plastic 17 and the like is uniformly diffused, and the light is transmitted through the light guide film 1. The liquid crystal cell can be effectively led to a high brightness.

(Embodiment 2) The method other than the ultraviolet irradiation in the production of the light guide film is described in Embodiment 1.
Perform in the same way as The method of ultraviolet irradiation is described in JP-A-6-281.
This is performed by applying the method disclosed in Japanese Patent Application Laid-Open No. 805.

The photopolymerizable mixture layer is provided on the support substrate in the same manner as in the first embodiment. An excimer laser or the like, which is a coherent light source containing a linearly polarized light component, is used for the support substrate, and a first light between the coherent light scattered on the support substrate surface and the coherent light incident on the support substrate is used. First, the interference fringes 19 are irradiated in one direction.

Next, as shown in FIG. 8, the first interference fringes 1
9 direction was changed to the irradiation direction of 9 and the second
Irradiation of the interference fringes 20 is performed. As shown in FIG. 9, the irradiation direction of the first interference fringe 19 is 60 degrees and 120 degrees.
The second interference fringe 20 and the third interference fringe 21 are similarly irradiated while changing the degree direction.

By repeating this operation, 2
More than one kind of photopolymerizable compound is selectively moved in a specific direction to generate a refractive index distribution, and a high refractive index region resin portion 3 and a low refractive index region resin portion 4 are formed. A plurality of columnar structures having a quadrangular or triangular cross section are formed in a plane in a filled state. Similar to the first embodiment, the refractive index distribution in the columnar structure may be either a refractive index gradient type as shown in FIG. 3 or a discontinuous refractive index type as shown in FIG.

Finally, the entire surface of the support substrate is irradiated with ultraviolet rays using a high-pressure mercury lamp. Thereafter, the light guide film formed on the support substrate is peeled off from the support substrate to obtain a light guide film having a large area and being thin and light.

[0058]

As described above, according to the light guide film of the present invention, a plurality of fine columnar structures are arranged in a plane, and the columnar structure has a higher refractive index than other regions. By having the function of guiding light in the thickness direction, it is possible to make the area larger than that of the optical fiber plate, and to obtain a thin, light, high-resolution one at low cost. Also,
Bonding to a hard liquid crystal cell or the like can be easily performed with a roller or the like.

Further, a plurality of fine columnar structures are arranged in a plane in close proximity to each other, and the columnar structures have a continuous refractive index such that the refractive index at the center is highest and the refractive index at the ends is lowest. Since it is formed so as to be variable and has a function of guiding light in the thickness direction, it can be made larger in area than an optical fiber plate, and can obtain a thin, light, high-resolution one at low cost. Further, bonding to a hard liquid crystal cell or the like can be easily performed with a roller or the like.

According to the method for producing a light guide film of the present invention, light from a high-pressure mercury lamp is applied to a photopolymerizable mixture layer comprising two or more photopolymerizable compounds having different refractive indices via a photomask. By irradiating the light guide film according to claim 1 or 2, a plurality of fine columnar structures can be arranged in a plane with different refractive index distribution states. Moreover, the area can be made larger than the optical fiber plate, and the resolution is high.
Thin and light products can be obtained at low cost.

A photopolymerizable mixture layer composed of two or more photopolymerizable compounds having different refractive indices is irradiated with light from a high-pressure mercury lamp via a photomask whose pattern is subjected to gradation processing. By,
By producing the light guide film according to claim 2,
By changing the distribution of the refractive index, a plurality of fine columnar structures can be arranged in a close proximity in the plane. In addition, it is possible to increase the area of the optical fiber plate compared with the optical fiber plate, and to obtain a thin and light one with a high resolution at a low cost.

Further, by irradiating light to a photopolymerizable mixture layer composed of two or more photopolymerizable compounds having different refractive indices so that light interference fringes intersect on the photopolymerizable mixture layer, By producing the light guide film according to claim 1 or 2, a plurality of fine columnar structures can be arranged in a plane by changing the distribution of the refractive index. In addition, it is possible to increase the area of the optical fiber plate compared with the optical fiber plate, and to obtain a thin and light one with a high resolution at a low cost.

According to the laminated film of the present invention, claim 1
Alternatively, by laminating the light guide film and the polarizing plate according to claim 2, since it is flexible unlike an optical fiber plate, lamination and integration with the polarizing plate can be performed in a large area, and cutting of the laminated film can be performed. Easy.
Further, it can be easily bonded to a hard liquid crystal cell or the like using a roller or the like.

Further, by laminating the light guide film according to claim 1 and the light diffusion layer, the lamination and integration with the light diffusion layer can be performed over a large area, and the cut of the laminated film can be performed. Can be easily done. Further, it can be easily bonded to a hard liquid crystal cell or the like using a roller or the like.

According to the liquid crystal display device of the present invention, the light guide film according to claim 1 or 2 or the laminated film according to claim 6 or 7 is mounted on the viewer side of the liquid crystal cell. Accordingly, the liquid crystal display device can be made thinner and lighter and can be obtained at lower cost as compared with the case where the optical fiber plate is mounted. In particular, in the case of a color liquid crystal display device using R, G, and B color filters, there is no mixing of adjacent color filters, and the color purity can be increased.

The light guide film according to claim 1 or 2 or the laminated film according to claim 6 or 7 is mounted between a liquid crystal cell and a lighting device for illuminating the liquid crystal cell. Accordingly, the liquid crystal display device can be made thinner and lighter than the case where the optical fiber plate is mounted, and can be obtained at low cost. In particular, in the case of a color liquid crystal display device using R, G, and B color filters, there is no mixing of adjacent color filters, and the color purity can be increased. Further, since light from the lighting device can be transmitted efficiently, high luminance or low power consumption can be realized.

As described above, since the light guide film according to the present invention has a fiber plate function, it can be used not only for the liquid crystal display devices described above, but also for the front surface of various display devices and a plurality of liquid crystal cells. Can be used for various purposes such as image transmission or advertisement display.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a light guide film according to an embodiment.

FIG. 2 is a cross-sectional view taken along line XX ′ of FIG. 1 and an explanatory diagram showing a refractive index distribution state thereof.

FIG. 3 is a cross-sectional view showing another example of the columnar structure and an explanatory diagram showing a refractive index distribution state thereof.

FIG. 4 is a cross-sectional view showing a laminated film according to an embodiment.

FIG. 5 is a sectional view showing another laminated film according to the embodiment.

FIG. 6 is a cross-sectional view illustrating a reflective color liquid crystal display device according to an embodiment.

FIG. 7 is a sectional view showing a transmission type color liquid crystal display device according to an embodiment.

FIG. 8 is an explanatory view illustrating a method for manufacturing the light guide film according to the second embodiment.

FIG. 9 is an explanatory view illustrating a method for manufacturing another light guide film according to the second embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 light guide film 2 columnar structure 3 high refractive index region resin portion 4 low refractive index region resin portion 5 lowest refractive index region resin portion 6 refractive index inclined region resin portion 7 absorption type polarizing plate 8 retardation plate 9 adhesive layer 10 Release paper 11 Light diffusion layer 12 Reflective polarizer 13 Specular reflector 14 Color filter 15 Liquid crystal 16 Electrode substrate 17 Light guide plate plastic 18 Light source 19 First interference fringe 20 Second interference fringe 21 Third interference fringe

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H038 AA52 AA53 AA55 2H091 FA02Y FA08X FA08Z FA11X FA14Z FA23X FA23Z FA24X FA24Z FA31Z FA41Z FB04 FB12 FC01 FC23 FC29 FD03 FD06 FD15 FD24 HA10 KA01 LA11 LA12

Claims (9)

[Claims] 1. A plurality of fine columnar structures are arranged in a plane, the columnar structures are formed to have a higher refractive index than other regions, and have a function of guiding light in a thickness direction. Light body film. 2. A plurality of fine columnar structures are arranged in close proximity to each other in a plane, and the columnar structures have a continuous refractive index such that a center has a highest refractive index and an end has a lowest refractive index. A light guide film, which is formed so as to be variable and has a function of guiding light in a thickness direction. 3. The method according to claim 1, wherein a light from a high-pressure mercury lamp is irradiated through a photomask onto a photopolymerizable mixture layer composed of two or more photopolymerizable compounds having different refractive indices. 3. A method for manufacturing a light guide film, comprising manufacturing the light guide film according to 2. 4. A photopolymerizable mixture layer composed of two or more photopolymerizable compounds having different refractive indices is irradiated with light from a high-pressure mercury lamp through a photomask having a mask pattern subjected to gradation processing. 3. A method for producing a light guide film, comprising: producing the light guide film according to claim 2. 5. A photopolymerizable mixture layer comprising two or more photopolymerizable compounds having different refractive indices is irradiated with light so that interference fringes of light intersect on the photopolymerizable mixture layer. A method for manufacturing a light guide film, comprising manufacturing the light guide film according to claim 1. 6. A laminated film obtained by laminating the light guide film according to claim 1 and a polarizing plate. 7. A laminated film characterized by laminating the light guide film according to claim 1 and a light diffusion layer. 8. A liquid crystal comprising a light guide film according to claim 1 or a laminated film according to claim 6 attached to an observer side of a liquid crystal cell. Display device. 9. A light guide film according to claim 1 or 2, or a laminated film according to claim 6 or 7, which is mounted between a liquid crystal cell and a lighting device for illuminating the liquid crystal cell. A liquid crystal display device comprising: