JP2010044221A - Optical package, lighting system, and display device - Google Patents

Abstract

An optical packaging body capable of suppressing a decrease in luminance caused by a packaging film, and an illumination device and a display device including the optical packaging body.
An uneven portion 23 is formed on at least a part of a surface (inner wall surface 20C) on a light guide plate 11 side of a joining portion 20A of a light incident side film 21 and a light emission side film 22 in a packaging film 20 that wraps the light guide plate 11. Is provided. Accordingly, by placing the light source in a region facing the uneven portion 23 and causing the light from the light source to enter the uneven portion 23, the ratio of the light from the light source reflected on the inner surface of the joint portion 20A is reduced. Is possible.
[Selection] Figure 2

Description

  The present invention relates to an optical packaging body in which at least a support is covered with a packaging film, and an illumination device and a display device including the optical packaging body.

  2. Description of the Related Art Conventionally, as a display device such as a word processor or a laptop personal computer, a liquid crystal display device having a thin and easy-to-see backlight (illumination device) has been used. As such an illuminating device for a liquid crystal display device, a linear light source such as a fluorescent tube is arranged on a side end portion of a light guide plate, and a liquid crystal panel is installed on the light guide plate via a plurality of optical elements. There are an edge light type illumination device (see Patent Document 1) and a direct type illumination device in which a light source and a plurality of optical elements are arranged directly under a liquid crystal panel.

  2. Description of the Related Art Conventionally, in a lighting device for a liquid crystal display device, a large number of optical elements are used for the purpose of improving the viewing angle and the luminance. Examples of the optical element include a diffusion plate having light diffusibility and a prism sheet having light collection properties.

JP 2005-301147 A

  By the way, with the recent increase in the screen size of the display device, the lighting device is also increased in area. In this case, it is required to increase the area of various optical sheets such as a prism sheet. However, when these optical sheets have a large area, wrinkles, deflection, and warpage are likely to occur due to their own weight. Further, as the area increases, the illuminance of the light source increases in order to maintain the brightness of the display surface. For this reason, the heat hitting the surface of the optical sheet having an increased area also increases, but since the heat is transmitted non-uniformly to the surface of the optical sheet, the deformation of the optical sheet due to heat does not occur uniformly. As a result, it can be said that wrinkles, deflection, and warpage are likely to occur due to heat.

  On the other hand, as a method for preventing the occurrence of wrinkling, bending, and warping of the optical sheet accompanying such an increase in the size of the screen, for example, it is conceivable to increase the thickness of the optical sheet to improve the lack of rigidity. However, in such a case, the lighting device becomes thick, and the thinning is hindered. Therefore, for example, it is conceivable that the optical sheets are bonded together with a transparent adhesive in the order of lamination. Thus, by laminating | stacking an optical sheet through a transparent adhesive agent, the rigidity of an optical sheet can be improved and it becomes possible to prevent generation | occurrence | production of a wrinkle, a bending, and a curvature.

  However, in the configuration in which the optical sheets are simply pasted together via a transparent adhesive, the thickness is increased by the thickness of the transparent adhesive, which may hinder thinning. Also, when the thermal expansion coefficients of the optical sheets are different from each other, when the light source is turned on, each optical sheet is heated by the heat from the light source and thermally expanded with a different amount of extension, while the light source is turned off and the light source is turned off. When the heat is not supplied from each of the optical sheets, each optical sheet is cooled and thermally contracted with different shrinkage amounts. Thus, when each optical sheet repeats expansion and contraction, when the optical sheets are bonded to each other, the optical sheets may bend and warp, and the optical characteristics may be deteriorated. Such a problem may also occur when the lower surface of the diffusion sheet and the upper surface of the light guide plate are bonded together with a transparent adhesive as described in the summary of Patent Document 1.

  Therefore, instead of using a transparent adhesive, it is conceivable to wrap the light guide plate and the optical sheet with a transparent packaging film. An optical packaging body in which a light guide plate and an optical sheet are wrapped with a packaging film can be manufactured, for example, as follows. First, after sandwiching the light guide plate and the optical sheet between two transparent heat-shrinkable films, the two heat-shrinkable films are welded and cut. Next, heat is applied to the two heat-shrinkable films after cutting, the two heat-shrinkable films are shrunk, and are brought into close contact with the light guide plate and the optical sheet. In this way, an optical package can be manufactured.

  However, if the light guide plate and the optical sheet are wrapped in a transparent packaging film, the packaging film exists between the light source and the light guide plate, so that the light from the light source is reflected on the surface of the packaging film and the brightness There is a problem that will decrease.

  The present invention has been made in view of such problems, and an object thereof is to provide an optical packaging body capable of suppressing a decrease in luminance due to a packaging film, and an illumination device and a display device including the optical packaging body. It is in.

  The first optical package of the present invention comprises a light guide plate having an upper surface, a lower surface and side surfaces, and a packaging film covering the light guide plate. The packaging film has a concavo-convex portion on at least one of a surface opposite to the light guide plate and a surface opposite to the light guide plate in a region facing the side surface of the light guide plate. Yes.

  A first lighting device of the present invention includes the first optical package and a light source that emits light toward the first optical package. The first display device of the present invention is a display panel driven based on an image signal, a light source that emits light for illuminating the display panel, and the first display device provided between the display panel and the light source. And an optical package.

  In the 1st optical packaging body of this invention, a 1st illuminating device, and a 1st display apparatus, it is an opposing area | region with the side surface of a light-guide plate among packaging films, and is opposite to a light-guide plate among the said packaging films. An uneven portion is provided on at least one of the side surface and the surface opposite to the light guide plate. Thereby, it is possible to reduce the rate at which the light from the light source is reflected on the surface of the packaging film by placing the light source in the region facing the concavo-convex portion and causing the light from the light source to enter the concavo-convex portion.

  The second optical package of the present invention comprises a light guide plate having an upper surface, a lower surface and side surfaces, and a packaging film covering the light guide plate. At least a part of a region facing the side surface of the light guide plate in the packaging film is in close contact with the side surface of the light guide plate.

  A second lighting device of the present invention includes the second optical package and a light source that emits light toward the second optical package. The second display device of the present invention is a display panel driven based on an image signal, a light source that emits light for illuminating the display panel, and the second display device provided between the display panel and the light source. And an optical package.

  In the second optical package, the second illumination device, and the second display device of the present invention, at least a part of a region of the packaging film that faces the side surface of the light guide plate is in close contact with the side surface of the light guide plate. Thus, the light source is placed on the portion of the packaging film that is in close contact with the side surface of the light guide plate, and the light from the light source is incident on the portion of the packaging film that is in close contact with the side surface of the light guide plate. It is possible to reduce the rate at which light from the light is reflected from the surface of the packaging film.

  The third optical package of the present invention comprises a light guide plate having an upper surface, a lower surface and side surfaces, and a packaging film that covers the light guide plate. The packaging film has one or more openings in at least a part of a region facing the side surface of the light guide plate.

  A third lighting device of the present invention includes the third optical package and a light source that emits light toward the third optical package. The third display device of the present invention is a display panel driven based on an image signal, a light source that emits light for illuminating the display panel, and the third display device provided between the display panel and the light source. And an optical package.

  In the third optical packaging body, the third illumination device, and the third display device of the present invention, one or a plurality of openings are provided in at least a part of a region of the packaging film that faces the side surface of the light guide plate. . Thereby, it is possible to reduce the rate at which the light from the light source is reflected on the surface of the packaging film by placing the light source in the opening of the packaging film and causing the light from the light source to enter the opening.

  According to the first optical packaging body, the first lighting device, and the first display device of the present invention, the packaging film is a region facing the side surface of the light guide plate, and the light guide plate of the packaging film Since the concavo-convex portion is provided on at least one of the surface on the opposite side and the surface opposite to the light guide plate, it is possible to reduce the rate at which light from the light source is reflected on the surface of the packaging film. Thereby, the fall of the brightness resulting from a packaging film can be suppressed.

  According to the second optical package, the second illumination device, and the second display device of the present invention, at least a part of a region of the packaging film facing the side surface of the light guide plate is brought into close contact with the side surface of the light guide plate. Therefore, it is possible to reduce the rate at which the light from the light source is reflected on the surface of the packaging film. Thereby, the fall of the brightness resulting from a packaging film can be suppressed.

  According to the third optical package, the third illumination device, and the third display device of the present invention, one or a plurality of openings are provided in at least a part of a region of the packaging film that faces the side surface of the light guide plate. Therefore, it is possible to reduce the rate at which the light from the light source is reflected on the surface of the packaging film. Thereby, the fall of the brightness resulting from a packaging film can be suppressed.

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

[First Embodiment]
FIG. 1 (A) represents an example of the top surface configuration of the optical package 1 according to the first embodiment of the present invention. FIG. 1B illustrates an example of a lower surface configuration of the optical package 1 in FIG. FIG. 2A illustrates an example of a cross-sectional configuration of the optical package 1 in FIG. FIG. 2B illustrates an example of a cross-sectional configuration of the optical package 1 in FIG. The optical package 1 includes, for example, an edge light including a display panel that is driven based on an image signal, a light guide plate that is disposed immediately below the display panel, and a light source that is disposed at an end of the light guide plate. It is used suitably for a type of lighting device.

  As shown in FIGS. 2A and 2B, the optical package 1 includes a laminate 10 and a packaging film 20.

  The laminated body 10 is configured by, for example, laminating a reflective sheet 14 (optical sheet), a light guide plate 11 (support), a diffusion sheet 12 (optical sheet), and a light collecting sheet 13 in this order. The condensing sheet 13 is provided on the side (light emission side film 22 side described later). Although not shown, this laminated body 10 has an optical sheet having at least one of a polarization separation function, a light source image adjustment function, and a light excitation light emission function on the light emission side in addition to the diffusion sheet 12 and the light collection sheet 13. You may have.

  The light guide plate 11 guides light from a light source (not shown) disposed on the side surface of the light guide plate 11 to the upper surface of the light guide plate 11. The light guide plate 11 has a shape corresponding to the display panel, for example, a rectangular parallelepiped shape surrounded by the upper surface 11A, the lower surface 11B, and the side surface 11C, as shown in FIGS. The light guide plate 11 has a predetermined patterned shape on at least one of the upper surface 11A and the lower surface 11B, and has a function of scattering and uniformizing light incident from the side surface. For example, the light guide plate 11 also functions as a support that supports an optical sheet (for example, a diffusion sheet, a lens film, a polarization separation sheet, or the like) disposed between the display panel and the optical package 1. The light guide plate 11 mainly includes, for example, a transparent thermoplastic resin such as polycarbonate resin (PC) or acrylic resin (polymethyl methacrylate (PMMA)).

  For example, the diffusion sheet 12 is a thin optical sheet formed by applying a transparent resin containing a light diffusion material on a relatively thin film-like transparent resin. As the film-like transparent resin, a light-transmitting thermoplastic resin such as PET, acrylic, and polycarbonate is used as in the case of the diffusion plate 11 described above. The light diffusion layer included in the diffusion plate has the same configuration as the diffusion plate 11 described above. Accordingly, the diffusion sheet 12 has a function of diffusing light that has passed through the diffusion plate 11 and return light from the diffusion sheet 12 side.

  For example, as shown in FIG. 2B, the light collecting sheet 13 has a plurality of convex portions 13A. The plurality of convex portions 13A have, for example, a linear shape (columnar shape) extending in a predetermined direction (that is, the depth direction in the drawing) orthogonal to the stacking direction of the stacked body 10, and the extending direction thereof. They are arranged side by side in the intersecting direction. The convex portion 13A may have a polygonal column shape, or the surface of the convex portion 13A may be a curved surface.

  The packaging film 20 covers all or only a part of the upper surface 11A, the lower surface 11B, and the side surface 11C of the light guide plate 11, and the light guide plate 11, the diffusion sheet 12, the light collecting sheet 13, and the reflection in a state where tension is applied in the in-plane direction. It is in close contact with the sheet 15. 2A and 2B, the packaging film 20 includes a light incident side film 21 (lower film) on the lower surface 11B side of the light guide plate 11, and the upper surface 11A side of the light guide plate 11. Has a light emission side film 22 (upper film). The light incident side film 21 and the light emitting side film 22 are joined by an annular joint portion 20 </ b> A formed in the outer peripheral region of the light guide plate 11 when viewed from the normal direction of the light guide plate 11. The light guide plate 11 is held from the line direction and the direction intersecting the normal direction of the light guide plate 11. The joining portion 20A is formed outside the light incident region 21A and the light emitting region 22A, and is formed at substantially the center (approximately the center in the thickness direction) of the region facing the side surface 11C of the light guide plate 11. Therefore, many of the side surfaces 11C of the light guide plate 11 are in contact with the joint portion 20A.

  Each of the light incident side film 21 and the light emission side film 22 is a flexible resin material having translucency, and is made of a material having at least one property of heat shrinkability and energy ray shrinkability. It is an optical sheet. Examples of the heat-shrinkable material include polyolefin resins such as polyethylene (PE) and polypropylene (PP), polyester resins such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), polystyrene (PS) and polyvinyl. Use vinyl bond resins such as alcohol (PVA), polycarbonate (PC) resins, cycloolefin resins, urethane resins, vinyl chloride resins, natural rubber resins, and artificial rubber resins alone or in combination. Typically, it is desirable to use biaxially oriented polypropylene (OPP), styrene-butadiene block copolymer (SBC), nylon, A-PET, biaxially oriented PEN, or the like. Note that it is preferable to use a polymer material that does not shrink when heated from room temperature to 85 ° C. as the material having heat shrinkability. Examples of the material having energy ray shrinkage include a material having an absorption band in the infrared (wavelength band of 2.5 μm to 30 μm), specifically, a polyolefin type such as polyethylene (PE) and polypropylene (PP). Resins, polyester resins such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), vinyl bond resins such as polystyrene (PS) and polyvinyl alcohol (PVA), polycarbonate (PC) resins, cycloolefin resins, chlorides Single or mixed resins such as vinyl resins can be used. Typically, biaxially stretched polypropylene (OPP), styrene-butadiene block copolymer (SBC), nylon, A-PET, biaxially stretched PEN, etc. It is desirable to use When a material having an absorption band in the infrared is used as the material of the light incident side film 21 and the light emission side film 22, the film can be shrunk by applying infrared rays without applying heat. The occurrence of thermal damage to the optical element in the film 20 can be eliminated.

  As the light incident side film 21 and the light emitting side film 22, it is preferable to use a uniaxially stretched or biaxially stretched (biaxial sequential, biaxial simultaneous) sheet or film. When such a sheet or film is used, the light incident side film 21 and the light emission side film 22 can be contracted in the stretching direction by applying heat, so the light incident side film 21 and the light emission side film Adhesion between the support 22 and the support can be enhanced. Further, as the light incident side film 21 and the light emitting side film 22, a film or sheet exhibiting extensibility may be used. When such a sheet or film is used, after the stretchable film or sheet is stretched in a predetermined direction, the stretched film or sheet is sandwiched between the inclusions and adhered around the inclusions. After bonding by welding, the tension of the film or sheet after bonding can be released to enhance the adhesion with the inclusion.

  The thermal contraction rate of the light incident side film 21 and the light emitting side film 22 needs to take into consideration the size, material, usage environment, and the like of the diffusing plate 11, the diffusing sheet 12, and the lens film 13, but at 90 ° C. It is preferably 0.2% or more and 100% or less, more preferably 0.5% or more and 20% or less, and further preferably 1% or more and 10% or less.

  If the thermal shrinkage rate is less than 0.2%, the adhesion between the light incident side film 21 and the light emitting side film 22 and the diffusion plate 11 may be deteriorated. On the other hand, if the thermal shrinkage rate exceeds 100% at 90 ° C., the thermal shrinkability may be non-uniform in the plane. In addition, from the viewpoint of preventing deterioration of the optical properties of the packaging film 20 caused by the bending of the packaging film 20 due to heat from the light source, the thermal deformation temperature of the packaging film 20 is preferably 80 ° C. or higher. More preferably, the temperature is higher than or equal to ° C. Further, when the heat shrinkage rate is 0.5% or more and 20% or less, it is possible to accurately estimate the shape change due to heat shrinkage, and the heat shrinkage rate is 1% or more and 10% or less. In this case, there is almost no shape deterioration due to heat shrinkage, and it is possible to estimate the shape change due to heat shrinkage very accurately. In addition, as for MD / TD ratio of shrinkage | contraction rate (%), it is desirable that it is 0.53-0.63 in JISZ1709. Further, the storage elastic modulus is desirably about 200 (M · Pa) at 50 Hz at Vibron.

  For example, by using TMA (thermal / stress / strain measuring device EXSTAR6000 TMA / SS) manufactured by Seiko, it is confirmed whether the light incident side film 21 and the light emitting side film 22 are in tension, It is possible to measure the magnitude of tension. First, in a state where tension is applied to the light incident side film 21 or the light emitting side film 22, a test piece of 5 mm × 50 mm is cut out from a central portion of the light incident side film 21 and the light emitting side film 22 with a rectangular mold. At this time, the test piece is cut out so that the long side and the short side of the test piece are parallel to the long side and the short side of the diffusion plate 11 as the support, respectively. Next, after the test piece is sandwiched between the glass plates so that there is no slack, the length of the cut-out test piece is measured using, for example, a tool microscope manufactured by Topcon Corporation. Since the cut-out test piece is in a state in which the tension is released, it is in a state of being contracted by more than 50 mm. The size is converted so as to return to the initial 50 mm state from this contracted state, and after the test piece is recut for TMA, the test piece after the recut is set in TMA. Next, the tension at the initial temperature of 25 ° C. is measured. Any tension measuring instrument can be used as long as it can measure the stress by applying a tensile stress to a predetermined length, and the presence or absence of tension can be confirmed.

  Further, the loss on drying of the packaging film 20 is preferably 2% or less. The thermal expansion coefficient of the packaging film 20 is preferably smaller than the thermal expansion coefficient of the laminated body 10 wrapped in the packaging film 20 from the viewpoint of improving the adhesion between the packaging film 20 and the laminated body 10. In addition, the smaller the refractive index, the smaller the reflection component on the surface of the packaging film 20 and the smaller the luminance loss, so the refractive index of the packaging film 20 is preferably 1.6 or less, and 1.55 or less. It is more preferable that

  The thicknesses of the light incident side film 21 and the light emitting side film 22 are each preferably 5 μm or more and 200 μm or less, more preferably 5 μm or more and 100 μm or less, and 5 μm or more and 50 μm or less. More preferably. It is difficult to produce a film having a thickness of less than 5 μm, and if it is less than 5 μm, the strength of the packaging film 20 may be insufficient. On the other hand, if the thickness is less than 5 μm, the shrinkage stress at the time of heat shrinkage is small, and the packaging film 20 may not adhere to the laminate 10. On the other hand, when the thickness exceeds 200 μm, it is difficult for the packaging film 20 to come into close contact with the edge of the laminate 10 (particularly the diffusion plate 11) when the packaging film 20 is heat-shrinked, and there is a possibility that the packaging film 20 may rise in the vicinity thereof. is there. In addition, when the thickness of the light incident side film 21 and the light emission side film 22 is 5 μm or more and 200 μm or less, respectively, the laminate 10 and the packaging film 20 can be easily adhered to each other, and further, 5 μm or more and 50 μm. In the case described below, the laminate 10 and the packaging film 20 can be brought into close contact with each other while ensuring the strength of the packaging film 20 at a minimum.

  Further, the thickness of the light incident side film 21 and the light emitting side film 22 may be different from each other. In such a case, the thickness of the light incident side film 21 is larger than the thickness of the light emitting side film 22. It is preferable that it is thick. By making the light incident side film 21 thick, it is possible to suppress a change in the shape of the laminate 10 due to heat from the light source. Moreover, the light incident side film 21 and the light emission side film 22 may be made of different materials. In such a case, it is possible to select a material suitable for each film.

  Further, the packaging film 20 may contain additives such as a light stabilizer, an ultraviolet absorber, an infrared absorber, an antistatic agent, a flame retardant, and an antioxidant as necessary, so that the light stabilizing function, You may provide an absorption function, an infrared absorption function, an electrostatic suppression function, a flame-retardant function, a flame-resistant oxidation function, etc. Further, the surface of the packaging film 20 such as anti-glare treatment (AG treatment) and anti-reflection treatment (AR treatment) may be applied to reduce the diffusion of reflected light or the reflected light itself. Moreover, you may provide the function which permeate | transmits the light of specific wavelength areas, such as UV-A light (light whose wavelength is about 315-400 nm), with respect to the packaging film 20. FIG.

  Moreover, the packaging film 20 may be comprised by the single layer, and may be comprised by the multiple layer. When the packaging film 20 is composed of a plurality of layers, additives such as fillers, light stabilizers, ultraviolet absorbers, infrared absorbers, antistatic agents, flame retardants and antioxidants are contained in the surface layer. Preferably it is. Moreover, when the filler is contained in the surface layer, it is preferable that irregularities are formed on the surface layer by the filler. In that case, sticking with other optical elements or the like can be prevented.

  Incidentally, the joining portion 20A for joining the light incident side film 21 and the light emitting side film 22 is a region facing the side surface 11C of the light guide plate 11 as shown in FIG. An uneven portion 23 is provided on at least a part of the inner surface (inner wall surface 20C) of 20A. This uneven | corrugated | grooved part 23 is provided in the area | region where the light from a light source passes toward inner side from the outer side of the packaging film 20 at least among inner wall surfaces 20C.

  For example, the uneven portion 23 includes a plurality of convex portions that extend in the thickness direction of the light guide plate 11 and are continuously arranged in parallel in a direction orthogonal to the thickness direction of the light guide plate 11. For example, as shown in an enlarged view in FIG. 3, the plurality of convex portions have a ridge line 23 </ b> A extending in the thickness direction of the light guide plate 11 and a pair of inclined surfaces 23 </ b> B formed on both sides of the ridge line 23 </ b> A. Thus, it has a concavo-convex shape that becomes zigzag when viewed from the upper surface side of the optical package 1. As a result, most of the light from the light source is incident on the surface of the concavo-convex portion 23 at a angle less than the critical angle. In addition, if each convex part in the uneven | corrugated | grooved part 23 becomes a shape which becomes a transmittance | permeability larger than the light transmittance of 20 A of joining parts when the surface inside the joining part 20A is flat, The shape may be other than the shape illustrated in FIG. 3. For example, the surface of each convex portion in the concavo-convex portion 23 may include a curved surface. Further, the concavo-convex portion 23 is configured by a plurality of convex portions that extend in a direction orthogonal or substantially orthogonal to the thickness direction of the light guide plate 11 and are continuously arranged in parallel in the thickness direction of the light guide plate 11. May be.

  Next, the effect | action of the optical package 1 of this Embodiment is demonstrated. When a light source is arranged in a region facing the concave and convex portion 23 of the optical package 1 and non-polarized light is irradiated from the light source toward the optical package 1, the irradiation light is transmitted through the bonding portion 20 </ b> A and the bonding portion. The light enters the concavo-convex portion 23 formed on the inner surface of 20A. The incident light on the concavo-convex portion 23 is refracted and transmitted through the surface of the concavo-convex portion 23, is scattered by the light guide plate 11, and is further reflected by the reflective sheet 14. Thereby, the in-plane luminance distribution is made uniform. Thereafter, the light transmitted through the light guide plate 11 is adjusted to light having a desired front luminance, in-plane luminance distribution, viewing angle, and the like by the diffusion sheet 12 and the light collecting sheet 13, and then the light emission side film 22 is transmitted. It is transmitted through and injected outside.

  By the way, in this Embodiment, the uneven | corrugated | grooved part 23 is provided in at least one part of the inner surface (inner wall surface 20C) of the junction part 20A which joins the light-incidence side film 21 and the light emission side film 22. FIG. Accordingly, by placing the light source in a region facing the uneven portion 23 and causing the light from the light source to enter the uneven portion 23, the ratio of the light from the light source reflected on the inner surface of the joint portion 20A is reduced. Is possible. As a result, a decrease in luminance due to the packaging film 20 can be suppressed.

  Moreover, in this Embodiment, the laminated body 10 (or light-guide plate 11) is covered by the packaging film 20 in the state to which the contractile force was applied. Thereby, since a tensile stress (so-called tension) works in an in-plane direction of the packaging film 20 at an arbitrary part of the packaging film 20, even when the packaging film 20 is thinned to about several tens of μm, for example. In at least the light incident area 21 </ b> A and the light emitting area 22 </ b> A, the generation of wrinkles, deflection, and warpage can be prevented.

[Second Embodiment]
FIG. 4A illustrates an example of a cross-sectional configuration when the optical package 2 according to the second embodiment of the present invention is cut along one direction. FIG. 4B illustrates an example of a cross-sectional configuration when the optical package 2 is cut along a direction orthogonal to the one direction.

  The optical package 2 is provided with an uneven portion 24 on the outer surface (end surface of the bonded portion 20A) of the bonded portion 20A instead of providing the uneven portion 23 on the inner surface (inner wall surface 20C) of the bonded portion 20A. Thus, the configuration is different from that of the optical package 1 according to the first embodiment. Therefore, in the following, differences from the optical packaging body 1 of the first embodiment will be mainly described, and description of points in common with the optical packaging body 1 of the first embodiment will be omitted as appropriate. Shall.

  As shown in FIG. 4A, the uneven portion 24 is provided on a part of the end surface 20D corresponding to the outer surface of the joint portion 20A. This uneven | corrugated | grooved part 24 is provided in the area | region where the light from a light source passes toward the inner side from the outer side of the packaging film 20 at least among end surface 20D.

  The concavo-convex portion 24 includes, for example, a plurality of convex portions that extend in the thickness direction of the light guide plate 11 and are continuously arranged in parallel in a direction orthogonal to the thickness direction of the light guide plate 11. For example, as shown in an enlarged view in FIG. 5, the plurality of convex portions includes a ridge line 24A extending in the thickness direction of the light guide plate 11 and a pair of inclined surfaces 24B formed on both sides of the ridge line 24A. In addition, it has a concavo-convex shape that becomes zigzag when viewed from the upper surface side of the optical package 2. Thereby, most of the light from the light source is incident on the surface of the concavo-convex portion 24 at a angle less than the critical angle. In addition, if each convex part in the uneven | corrugated | grooved part 24 becomes a shape which becomes a transmittance | permeability larger than the light transmittance of 20 A of joining parts when the outer surface of the joining part 20A is flat, For example, the surface of each convex portion in the concavo-convex portion 24 may include a curved surface.

  Next, the effect | action of the optical package 2 of this Embodiment is demonstrated. When a light source is disposed in a region facing the concave and convex portion 24 of the optical packaging body 2 and non-polarized light is irradiated from the light source toward the optical packaging body 2, the irradiation light is formed on the outer surface of the joint portion 20A. The light enters the uneven portion 24. The incident light to the concavo-convex portion 24 is refracted and transmitted through the surface of the concavo-convex portion 24, then passes through the joint portion 20 </ b> A, further refracts and passes through the inner surface of the joint portion 20 </ b> A, and is scattered by the light guide plate 11. 14 is reflected. Thereby, the in-plane luminance distribution is made uniform. Thereafter, the light transmitted through the light guide plate 11 is adjusted to light having a desired front luminance, in-plane luminance distribution, viewing angle, and the like by the diffusion sheet 12 and the light collecting sheet 13, and then the light emission side film 22 is transmitted. It is transmitted through and injected outside.

  By the way, in this Embodiment, the uneven | corrugated | grooved part 24 is provided in at least one part of the outer surface (end surface 20D) of the junction part 20A which joins the light-incidence side film 21 and the light emission side film 22. FIG. Accordingly, the ratio of the light from the light source reflected on the outer surface of the joint portion 20A is reduced by placing the light source in the region facing the uneven portion 24 and causing the light from the light source to enter the uneven portion 24. Is possible. As a result, a decrease in luminance due to the packaging film 20 can be suppressed.

  In addition, by adjusting the shape and angle of the light incident surface of the concavo-convex portion 24, it is possible to widen the divergence angle of light after being refracted and transmitted through the concavo-convex portion 24. In such a case, the packaging film The luminance unevenness can be suppressed while suppressing the decrease in the luminance due to 20.

  In the second embodiment, the uneven portion 23 mentioned in the first embodiment may be further provided on the inner surface (inner wall surface 20C) of the joint portion 20A. This makes it possible to reduce not only the rate at which light from the light source is reflected at the outer surface of the joint 20A but also the rate at which it is reflected at the inner surface of the joint 20A. The resulting decrease in luminance can be further suppressed.

[Third Embodiment]
FIG. 6A illustrates an example of a cross-sectional configuration when the optical package 3 according to the third embodiment of the present invention is cut along one direction. FIG. 6B illustrates an example of a cross-sectional configuration when the optical package 3 is cut along a direction orthogonal to the one direction.

  As shown in FIGS. 6A and 6B, the optical package 3 includes a laminate 10 and a packaging film 20. In the present embodiment, the packaging film 20 includes, for example, a film on the upper surface 11 </ b> A side and a film on the lower surface 11 </ b> B side of the light guide plate 11, and the one film is a laminate 10. A close contact portion 20E that is in close contact with all or a part of the three end surfaces (particularly, the side surface 11C of the light guide plate 11), the upper surface, and the lower surface. The contact portion 20E is provided in a part of a region facing the three surfaces of the side surface 11C, the upper surface 11A, and the lower surface 11B of the light guide plate 11. 6A and 6B illustrate a case where the close contact portion 20E is provided in a part of a region facing the side surface 11C of the light guide plate 11.

  The close contact portion 20 </ b> E extends along the side surface 11 </ b> C of the light guide plate 11 and has an annular shape when viewed from the normal direction of the upper surface 11 </ b> A of the light guide plate 11. Here, the close contact between the wrapping film 20 and the side surface 11C of the light guide plate 11 means that the wrapping film 20 and the side surface 11C of the light guide plate 11 are in contact with each other or sticking tightly through some tangible object. In other words, there is almost no air layer between the packaging film 20 and the side surface 11C of the light guide plate 11.

  A part of the contact portion 20E is joined to the side surface 11C of the light guide plate 11 directly or via some tangible object, and a portion of the contact portion 20E that is joined to the side surface 11C of the light guide plate 11 (joint portion 20F). There is almost no air layer between the side surface 11C of the light guide plate 11. Therefore, the difference in refractive index between the joint portion 20F and the side surface 11C of the light guide plate 11 is the difference in refractive index between the packaging film 20 and air, or the difference in refractive index between the side surface 11C of the light guide plate 11 and air. Is smaller than The joint 20F is provided at a position where the light from the light source is incident from the outside of the packaging film 20 (light incident position) or adjacent to the light incident position, and the refractive index in a region through which the light from the light source passes. It is provided so that an interface with a large difference is not formed. In addition, by providing the joining portion 20F adjacent to the light incident position, the adhesion between the contact portion 20E and the side surface 11C of the light guide plate 11 is enhanced at a portion adjacent to the joint portion 20F, and the contact portion 20E and the light guide plate 11 are increased. It is possible to prevent an air layer from being formed between the side surface 11C of the first and second sides. For example, although not shown in the drawing, the adhesiveness at the light incident position can be improved by providing the joint portions 20F at two positions facing each other with the light incident position therebetween in the close contact portion 20E.

  Note that the close contact portion 20E does not need to be in close contact with the entire side surface 11C of the light guide plate 11; for example, as shown in FIGS. May be just in close contact. Similarly, the joining portion 20F does not need to be joined to the entire side surface 11C of the light guide plate 11, and, for example, as shown in FIGS. 7A and 7B, a part of the side surface 11C of the light guide plate 11 It may be joined only to.

  Further, the contact portion 20E is preferably made of a material having a refractive index equal to or close to the refractive index of the side surface 11C of the light guide plate 11. For example, when the contact portion 20E is configured to include a predetermined polymer, the side surface 11C of the light guide plate 11 is also configured to include the same or common polymer as the polymer included in the contact portion 20E. It is preferable.

  Further, as described above, the contact portion 20E is in direct contact with the side surface 11C of the light guide plate 11 as shown in FIGS. 6A, 6B, 7A, and 7B, for example. Alternatively, it may be tightly attached to the side surface 11C of the light guide plate 11 through some tangible object. For example, as shown in FIGS. 8A and 8B, at least a portion of the packaging film 20 where light from the light source is incident from the outside of the packaging film 20 and the side surface 11 </ b> C of the light guide plate 11, The adhesive member 15 that bonds them may be provided, and the close contact portion 20E may be tightly attached to the side surface 11C of the light guide plate 11 via the adhesive member 15. Note that the adhesive member 15 may cover the entire side surface 11 </ b> C of the light guide plate 11. Here, the adhesive member 15 includes, for example, a heat-sensitive adhesive or an ultraviolet curable resin. The adhesive member 15 is preferably made of a material having a refractive index equal to or close to the refractive index of the contact portion 20E and the side surface 11C of the light guide plate 11.

  Next, the effect | action of the optical package 3 of this Embodiment is demonstrated. A light source is arranged in a region facing the joint 20F of the optical package 3 or a region facing the part adjacent to the joint 20F in the optical package 3, and the non-polarized light is directed from the light source toward the optical package 2. When light is irradiated, the irradiated light is incident on the joint portion 20F of the optical package 3 or a portion of the optical package 3 adjacent to the joint portion 20F. Incident light to these regions is refracted and transmitted through the outer interface of the optical package 3, the inside of the optical package 3, and the inner interface of the optical package 3, and then is scattered by the light guide plate 11 and further reflected by the reflection sheet 14. Reflected. Thereby, the in-plane luminance distribution is made uniform. Thereafter, the light transmitted through the light guide plate 11 is adjusted to light having a desired front luminance, in-plane luminance distribution, viewing angle, and the like by the diffusion sheet 12 and the light collecting sheet 13, and then the light emission side film 22 is transmitted. It is transmitted through and injected outside.

  By the way, in this Embodiment, the junction part 20F of the optical package 3 and the side surface 11C of the light guide plate 11 are mutually joined, and the junction part 20F of the optical package 3 or the junction part 20F of the optical package 3 is used. The adhesion between the portion adjacent to the side surface 11C and the side surface 11C of the light guide plate 11 is high. Thereby, a light source is arrange | positioned in the opposition area | region with the junction part 20F of the optical package 3, or the opposition area | region with the site | part adjacent to the junction part 20F in the optical package 3, and the light from a light source is made into these area | regions. By making it enter, the ratio by which the light from a light source is reflected in the inner surface of the packaging film 20 can be made low. As a result, a decrease in luminance due to the packaging film 20 can be suppressed.

  In addition, by adjusting the shape and angle of the light incident surface of the concavo-convex portion 24, it is possible to widen the divergence angle of light after being refracted and transmitted through the concavo-convex portion 24. In such a case, the packaging film The luminance unevenness can be suppressed while suppressing the decrease in the luminance due to 20.

  In addition, when arrange | positioning a light source in the opposition area | region with the site | part adjacent to the junction part 20F among the optical packaging bodies 3, and injecting the light from a light source from the area | region, the outer side of the packaging film 20 among the area | regions. You may make it provide the uneven | corrugated | grooved part 24 mentioned in the said 2nd Embodiment on the surface. This makes it possible to reduce not only the rate at which light from the light source is reflected at the inner surface of the packaging film 20 but also the rate at which it is reflected at the outer surface of the packaging film 20. The resulting decrease in luminance can be further suppressed.

[Modification of Third Embodiment]
In the said embodiment, the case where the packaging film 20 was comprised with one film was illustrated, For example, as shown in FIG. 9, the edge part of the film by the side of the upper surface 11A of the light-guide plate 11, and You may be comprised by the edge part of the film by the side of the lower surface 11B of the light-guide plate 11 mutually joined by the junction part 20A. In such a case, the joint portion 20A is provided, for example, in a region facing the side surface 11C of the light guide plate 11, and is guided, for example, when viewed from the normal direction of the upper surface 11A of the light guide plate 11. It is formed on the periphery of the optical plate 11 and has an annular shape. Then, at least a part of the joint 20A, specifically, a portion where light from the light source enters or a portion in the vicinity thereof is directly or via some tangible object on the side surface 11C of the light guide plate 11 by a joining process in the manufacturing process. And has a flat shape that is crushed from the normal direction of the side surface 11C of the light guide plate 11. Note that, as long as the display characteristics are not hindered, the joint portion 20A may be provided in a region facing the region other than the side surface 11C of the light guide plate 11 (for example, the upper surface 11A or the lower surface 11B of the light guide plate 11). In some cases, at least a part of the joining portion 20A is joined to the upper surface 11A or the lower surface 11B of the light guide plate 11 directly or via some tangible object.

  Further, as mentioned in the above modification, in the embodiment, when the packaging film 20 is constituted by two films, the joint portion 20A is, for example, as shown in FIG. 11, the end of the film on the upper surface 11 </ b> A side and the end of the film on the lower surface 11 </ b> B side of the light guide plate 11 may be overlapped with each other when viewed from the side surface 11 </ b> C side of the light guide plate 11. Here, as shown in FIG. 10, for example, as shown in FIG. 10, the end portion of the film on the upper surface 11 </ b> A side of the light guide plate 11 and the end portion of the film on the lower surface 11 </ b> B side of the light guide plate 11 overlap each other. It may be formed over the entire region facing the side surface 11C of the light guide plate 11, or may be formed only in a part of the region facing the side surface 11C of the light guide plate 11. For example, as shown in FIG. The light guide plate 11 may be formed at a location deviating from the region facing the side surface 11C. However, the portion where the end portion of the film on the upper surface 11A side of the light guide plate 11 and the end portion of the film on the lower surface 11B side of the light guide plate 11 are overlapped with each other is out of the region facing the side surface 11C of the light guide plate 11 For example, as illustrated in FIG. 11, the bonding portion 20 </ b> A and the close contact portion 20 </ b> E or the bonding portion 20 </ b> F are formed at different positions.

[Modifications of the above embodiments]
In each said embodiment, although the case where the reflective sheet 14, the light-guide plate 11, the diffusion sheet 12, the condensing sheet 13, etc. were covered by the packaging film 20 was illustrated and demonstrated, as needed, the diffusion sheet 12 was demonstrated. Alternatively, the light collecting sheet 13 may be taken out of the packaging film 20.

  Further, in each of the above embodiments, the packaging film 20 merely wraps the laminated body 10, but at least one or a plurality of optical sheets contained in the packaging film 20 is included in a predetermined region of the packaging film 20. It is also possible to give the function of one optical sheet. At this time, it is preferable that at least one of the upper film and the lower film of the packaging film 20 is formed by overlapping a plurality of films. A light source is arranged on the lower film 21 side in at least one region of the packaging film 20 facing the upper surface 11A of the light guide plate 11 and the facing region of the packaging film 20 facing the lower surface 11B of the light guide plate 11. It is preferable to provide an optical function unit that acts on the light from the light source. As an optical function part provided in the area | region facing 11 A of upper surfaces of the light-guide plate 11 among the packaging films 20, a spreading | diffusion function, a condensing function, a polarization separation function, a light source image adjustment function, a light excitation light emission function etc. are mentioned, for example. Moreover, as an optical function part provided in the opposing area | region with the lower surface 11B of the light-guide plate 11 among the packaging films 20, a scattering function, a reflective function, a light excitation light emission function etc. are mentioned, for example.

  For example, as shown in FIGS. 12A and 12B, a diffusion unit 25 having the same function as the diffusion sheet 12 is provided in the light emission region 22 </ b> A of the light emission side film 21 instead of the diffusion sheet 12. It is possible. Note that FIG. 12A illustrates an example of a cross-sectional configuration of a portion corresponding to the line AA of the optical package 1 in FIG. FIG. 12B illustrates an example of a cross-sectional configuration of a portion corresponding to the line BB of the optical package 1 in FIG. In addition, it cannot be overemphasized that the modified example described below is applicable also to the optical packaging bodies 2 and 3. FIG.

  The diffusing unit 25 contains, for example, one or more light diffusing materials (fine particles). As the fine particles, for example, at least one of organic fillers and inorganic fillers can be used. As the material for the organic filler, for example, one or more selected from the group consisting of an acrylic resin, a silicone resin, a styrene resin, fluorine, and a cavity can be used. As the inorganic filler, for example, one or more selected from the group consisting of silica, alumina, talc, titanium oxide and barium sulfate can be used. Considering the permeability, it is preferable to use a transparent organic filler as the fine particles. As the shape of the fine particles, various shapes such as a needle shape, a spherical shape, an ellipsoid shape, a plate shape, and a scale shape can be used. The diffusion unit 25 may contain fine particles having the same diameter, or fine particles having a plurality of types of diameters.

  Further, for example, as shown in FIGS. 12A and 12B, another upper film 26 is provided on the light emission side of the packaging film 20 instead of the light collecting sheet 13. It is possible to provide a light condensing part 27 having the same function as the light condensing sheet 13 in the light emission region 22A. The condensing unit 27 has, for example, a plurality of linear convex portions 27A in the light emission region 22A. The plurality of convex portions 27A have, for example, a linear shape (columnar shape) extending in a predetermined direction orthogonal to the stacking direction of the stacked body 10 and continuously in a direction intersecting with the extending direction. They are arranged side by side.

  Further, for example, as shown in FIGS. 12A and 12B, instead of the reflective sheet 15, the light incident side film 21 is located in a region facing the lower surface 11 </ b> B of the light guide plate 11 and is similar to the reflective sheet 15. It is possible to provide the reflecting portion 28 having the function described above. The reflection unit 28 is made of, for example, whitened PET, a resin containing a void, or the like.

  By the way, what has the function similar to the optical sheet (The diffusion sheet 12, the condensing sheet | seat 13, the reflective sheet 15) in the packaging film 20 is provided in the packaging film 20, and at least one of an upper film and a lower film is plural. In the case of forming the films by superimposing them, as shown in FIGS. 12A and 12B, it is possible to join all the films at a common location (joining portion 20A). In such a case, even if at least one of the upper film and the lower film is constituted by a plurality of films, the light guide plate 11 is formed with the upper film and the lower film in the manufacturing process. When wrapping, the positional relationship of the film can be defined by the positioning accuracy of the machine that manufactures the optical package 1, 2, or 3. As a result, there is no possibility that each film is shifted. Further, as described above, in the packaging film 20, the region facing the upper surface 11 </ b> A of the light guide plate 11 (light emission region 22 </ b> A) and the region of the packaging film 20 facing the lower surface 11 </ b> B of the light guide plate 11 or the joint 20 </ b> A. At least one region is provided with optical function units (diffusing unit 25, condensing unit 27, reflecting unit 28) that act on the light from the light source. Thereby, for example, the function of at least one optical sheet among the plurality of optical sheets that need to be provided in the packaging film can be imparted to the packaging film 20, and the optical sheet can be omitted. Therefore, in such a case, the number of optical sheets included in the packaging film 20 is reduced, so that the frequency with which the optical sheets are shifted can be reduced by the amount of reduction. Thus, in this modification, since there is no possibility that each film will shift, and the frequency of shifting the optical sheet can be reduced by reducing the number of optical sheets contained in the packaging film 20, the film or optical sheet It is possible to reduce the decrease in yield due to the shift.

  In addition, when replacing each optical sheet with the film on the light incident side or the film on the light emission side of the packaging film 20, a set of all films is not welded (joined) at a common location (joining portion 20A). Although welding (bonding) may be considered for each film, this is not preferable in the following points. For example, when replacing the optical sheet disposed on the light incident side with the film on the light incident side of the packaging film 20, a film on the light emission side is necessarily required. Loss due to reflection occurs and luminance loss occurs. In addition, every time the optical sheet is replaced with a light incident side film or a light exit side film, a welding (bonding) process is required, which not only increases the number of processes, but also reduces the yield due to a failure in welding (bonding). Is concerned.

  On the other hand, in this modification, when each optical sheet is replaced with a light incident side film or a light exit side film of the packaging film 20, all the films are welded (joined) at a common location (joining portion 20A). Therefore, no unnecessary film is added, and there is no possibility that thinning is hindered or luminance loss occurs. Moreover, since the optical packaging bodies 1, 2, or 3 can be manufactured by one welding (joining), the number of processes hardly increases and there is no need to worry about a decrease in yield due to failure of welding (joining).

  Moreover, in each said embodiment, it is also possible to provide opening to the packaging film 20 and to make the inside and the exterior of the packaging film 20 communicate. For example, as shown in FIGS. 13, 14, and 15, one or a plurality of openings 20 </ b> B may be provided in a region of the packaging film 20 facing the side surface 11 </ b> C of the light guide plate 11. FIG. 13 illustrates a case where openings 20 </ b> B are provided at locations corresponding to the four corners of the light guide plate 11. FIG. 14 illustrates a case where the opening 20 </ b> B is provided at a location corresponding to the central portion of each side of the light guide plate 11. Further, FIG. 15 illustrates a case where the opening 20B is provided in a portion corresponding to a pair of sides facing each other in the light guide plate 11, and the packaging film 20 has a strip shape. Of course, it is possible to appropriately adjust the location, size, and number of the openings 20B as necessary.

[Fourth Embodiment]
FIG. 16A shows an example of a cross-sectional configuration when the optical package 4 according to the fourth embodiment of the present invention is cut along one direction. FIG. 16B illustrates an example of a cross-sectional configuration when the optical package 4 is cut along a direction orthogonal to the one direction.

  For example, as shown in FIGS. 16A and 16B, the packaging film 20 of the optical packaging body 4 includes a film on the upper surface 11A side and a film on the lower surface 11B side of the light guide plate 11 as a single film. Has been. And this packaging film 20 has several opening 20G in a part of area | region facing 11 C of side surfaces of the light-guide plate 11, as expanded and shown in FIG. This is different from the configurations of the first and second embodiments in that the concave and convex portions 23 and 24 are not provided in the opposite region. Therefore, hereinafter, differences from the optical packaging bodies 1 and 2 of the first and second embodiments will be mainly described, and the optical packaging bodies 1 and 2 of the first and second embodiments will be described. The description of the common points will be omitted as appropriate.

  The light incident surface which is a region facing the side surface 11C of the light guide plate 11 in the packaging film 20 and on which light from the light source is incident is substantially flat. And the opening 20G mentioned above is provided in the area | region where the light from a light source passes toward the inner side from the outer side of the packaging film 20 among the light incident surfaces, ie, the area | region facing a light source. The opening 20G may be formed in a dot shape, for example, in a region facing the light source, or may be formed in a slit shape as shown in FIG.

  Next, the effect | action of the optical package 4 of this Embodiment is demonstrated. When a light source is disposed in a region facing the opening 20G of the optical packaging body 4 and non-polarized light is irradiated from the light source toward the optical packaging body 4, the irradiation light mainly passes through the opening 20G, that is, a packaging film. The light is directly incident on the side surface 11 </ b> C of the light guide plate 11 in the packaging film 20 without going through 20. Incident light on the side surface 11 </ b> C of the light guide plate 11 is scattered by the light guide plate 11 and further reflected by the reflection sheet 14. Thereby, the in-plane luminance distribution is made uniform. Thereafter, the light transmitted through the light guide plate 11 is adjusted to light having a desired front luminance, in-plane luminance distribution, viewing angle, and the like by the diffusion sheet 12 and the light collecting sheet 13, and then the light emission side film 22 is transmitted. It is transmitted through and injected outside.

  By the way, in this Embodiment, the some opening 20G is provided in a part of area | region facing the side surface 11C of the light-guide plate 11 among the packaging films 20, and the side surface 11C of the light-guide plate 11 is exposed in the opening 20G. ing. As a result, the light source is placed in a region facing the opening 20G, and light from the light source is incident on the side surface 11C of the light guide plate 11 mainly through the opening 20G, whereby the light from the light source is reflected on the surface of the packaging film 20. It is possible to reduce the ratio of being generated. As a result, a decrease in luminance due to the packaging film 20 can be suppressed.

[Application example]
Next, application examples of the optical packaging bodies 1, 2, 3, and 4 according to the above embodiments will be described.

  FIG. 18 illustrates a cross-sectional configuration of the display device 5 according to the first application example. The display device 5 includes a display panel 51, an optical package 1 disposed behind the display panel 51, a light source 52 disposed at an end of the optical package 1, and a reflection disposed behind the light source 52. And a plate 53.

  Although not shown, the display panel 51 has a laminated structure having a liquid crystal layer between a transparent substrate on the image display side and a transparent substrate on the light source 52 side. Specifically, a polarizing plate, a transparent substrate, a color filter, a transparent electrode, an alignment film, a liquid crystal layer, an alignment film, a transparent pixel electrode, a transparent substrate, and a polarizing plate are sequentially provided from the image display side.

  The polarizing plate is a kind of optical shutter, and allows only light (polarized light) in a certain vibration direction to pass therethrough. Each of these polarizing plates is disposed so that the polarization axes thereof are different from each other by 90 degrees, whereby the light emitted from the light source 5 is transmitted or blocked through the liquid crystal layer. The transparent substrate is made of a substrate transparent to visible light, for example, a plate glass. Note that an active drive circuit including a TFT (Thin Film Transistor) as a drive element electrically connected to the transparent pixel electrode and wiring is formed on the transparent substrate on the light source 5 side. The color filter is configured by arranging color filters for separating the emitted light from the light source 5 into, for example, three primary colors of red (R), green (G), and blue (B). The transparent electrode is made of, for example, ITO (Indium Tin Oxide) and functions as a common counter electrode. The alignment film is made of, for example, a polymer material such as polyimide, and performs an alignment process on the liquid crystal. The liquid crystal layer is made of, for example, a liquid crystal in a VA (Vertical Alignment) mode, a TN (Twisted Nematic) mode, or an STN (Super Twisted Nematic) mode, and the light emitted from the light source 5 is applied to each pixel by a voltage applied from the drive circuit. It has a function of transmitting or blocking. The transparent pixel electrode is made of, for example, ITO and functions as an electrode for each pixel.

  The light source 52 is, for example, a single linear light source or a plurality of point light sources arranged in a line. The linear light source is, for example, a fluorescent lamp called a cold cathode fluorescent lamp (CCFL) or a hot cathode fluorescent lamp (HCFL), and the point light source is, for example, a light emitting diode. For example, the light source 52 is disposed in a region facing the side surface 11C of the light guide plate 11 so as to extend along the side surface 11C. The light source 52 is formed in a region facing the uneven portion 23 of the optical package 1.

  In the display device 5 according to this application example, the light source 52 is disposed in a region facing the concave and convex portion 23 of the optical package 1. When non-polarized light is irradiated from the light source 52 toward the optical package 1, the irradiated light is transmitted through the bonding portion 20 </ b> A and is incident on the uneven portion 23 formed on the inner surface of the bonding portion 20 </ b> A. The incident light on the concavo-convex portion 23 is refracted and transmitted through the surface of the concavo-convex portion 23, is scattered by the light guide plate 11, and is further reflected by the reflective sheet 14. Thereby, the in-plane luminance distribution is made uniform. Thereafter, the light transmitted through the light guide plate 11 is adjusted to light having a desired front luminance, in-plane luminance distribution, viewing angle, and the like by the diffusion sheet 12 and the light collecting sheet 13, and then the light emission side film 22 is transmitted. The light is transmitted and incident on the back surface of the display panel 51. The light incident on the display panel 51 is modulated by the display panel 51 and emitted from the surface of the display panel 51 as image light.

  By the way, in this application example, since the optical packaging body 1 is used, the brightness | luminance fall resulting from the packaging film 20 is few. Thereby, a high-luminance display device can be provided without increasing power consumption. In addition, a display device with high display quality can be provided with almost no deterioration in optical properties due to wrinkles, sagging, and warping of the film and the optical sheet. Moreover, as a result of using the optical package 1, the whole display apparatus 5 can be made thin and the display apparatus 5 can be reduced in weight.

  FIG. 19 illustrates a cross-sectional configuration of the display device 6 according to the second application example. The display device 6 includes a display panel 51, an optical package 2 disposed behind the display panel 51, a light source 52 disposed at an end of the optical package 2, and a reflection disposed behind the light source 52. And a plate 53.

  In the display device 6 according to this application example, the light source 52 is disposed in a region facing the concavo-convex portion 24 of the optical package 2. Therefore, when non-polarized light is irradiated from the light source 52 toward the optical package 2, the irradiated light is incident on the uneven portion 24 formed on the outer surface of the bonding portion 20A. The incident light to the concavo-convex portion 24 is refracted and transmitted through the surface of the concavo-convex portion 24, then passes through the joint portion 20 </ b> A, further refracts and passes through the inner surface of the joint portion 20 </ b> A, and is scattered by the light guide plate 11. 14 is reflected. Thereby, the in-plane luminance distribution is made uniform. Thereafter, the light transmitted through the light guide plate 11 is adjusted to light having a desired front luminance, in-plane luminance distribution, viewing angle, and the like by the diffusion sheet 12 and the light collecting sheet 13, and then the light emission side film 22 is transmitted. The light is transmitted and incident on the back surface of the display panel 51. The light incident on the display panel 51 is modulated by the display panel 51 and emitted from the surface of the display panel 51 as image light.

  By the way, in this application example, since the optical packaging body 2 is used, the brightness | luminance fall resulting from the packaging film 20 is few. Thereby, a high-luminance display device can be provided without increasing power consumption. In addition, a display device with high display quality can be provided with almost no deterioration in optical properties due to wrinkles, sagging, and warping of the film and the optical sheet. Moreover, as a result of using the optical package 2, the entire display device 6 can be thinned, and the display device 6 can be reduced in weight.

  FIG. 20 illustrates a cross-sectional configuration of the display device 7 according to the third application example. The display device 7 includes a display panel 51, an optical package 3 disposed behind the display panel 51, a light source 52 disposed at an end of the optical package 3, and a reflection disposed behind the light source 52. And a plate 53.

  In the display device 7 according to this application example, the light source 52 is arranged in a region facing the bonding portion 20F of the optical package 3 or a portion of the optical package 3 adjacent to the bonding portion 20F. Therefore, when non-polarized light is irradiated from the light source 52 toward the optical packaging body 3, the irradiation light is incident on the bonding portion 20 </ b> F of the optical packaging body 3 or a portion of the optical packaging body 3 adjacent to the bonding portion 20 </ b> F. . Incident light to these regions is refracted and transmitted through the outer interface of the optical package 3, the inside of the optical package 3, and the inner interface of the optical package 3, and then is scattered by the light guide plate 11 and further reflected by the reflection sheet 14. Reflected. Thereby, the in-plane luminance distribution is made uniform. Thereafter, the light transmitted through the light guide plate 11 is adjusted to light having a desired front luminance, in-plane luminance distribution, viewing angle, and the like by the diffusion sheet 12 and the light collecting sheet 13, and then the light emission side film 22 is transmitted. The light is transmitted and incident on the back surface of the display panel 51. The light incident on the display panel 51 is modulated by the display panel 51 and emitted from the surface of the display panel 51 as image light.

  By the way, in this application example, since the optical packaging body 3 is used, the brightness | luminance fall resulting from the packaging film 20 is few. Thereby, a high-luminance display device can be provided without increasing power consumption. In addition, a display device with high display quality can be provided with almost no deterioration in optical properties due to wrinkles, sagging, and warping of the film and the optical sheet. Moreover, as a result of using the optical package 3, the entire display device 7 can be thinned, and the display device 7 can be reduced in weight.

  FIG. 21 illustrates a cross-sectional configuration of the display device 8 according to the fourth application example. The display device 8 includes a display panel 51, an optical package 4 disposed behind the display panel 51, a light source 52 disposed at an end of the optical package 4, and a reflection disposed behind the light source 52. And a plate 53.

  In the display device 8 according to this application example, the light source 52 is disposed in a region facing the opening 20 </ b> G of the optical package 4. When non-polarized light is irradiated from the light source 52 toward the optical packaging body 4, the irradiation light mainly passes through the opening 20G, that is, without passing through the packaging film 20, and the side surface 11C of the light guide plate 11 in the packaging film 20. Directly incident on. Light incident on the side surface 11 of the light guide plate 11 is scattered by the light guide plate 11 and further reflected by the reflection sheet 14. Thereby, the in-plane luminance distribution is made uniform. Thereafter, the light transmitted through the light guide plate 11 is adjusted to light having a desired front luminance, in-plane luminance distribution, viewing angle, and the like by the diffusion sheet 12 and the light collecting sheet 13, and then the light emission side film 22 is transmitted. The light is transmitted and incident on the back surface of the display panel 51. The light incident on the display panel 51 is modulated by the display panel 51 and emitted from the surface of the display panel 51 as image light.

  By the way, in this application example, since the optical packaging body 4 is used, the brightness | luminance fall resulting from the packaging film 20 is few. Thereby, a high-luminance display device can be provided without increasing power consumption. In addition, a display device with high display quality can be provided with almost no deterioration in optical properties due to wrinkles, sagging, and warping of the film and optical sheet. In addition, as a result of using the optical package 4, the entire display device 8 can be thinned, and the display device 8 can be reduced in weight.

  In each of the application examples, an optical sheet such as a lens film or a reflective polarizing sheet can be provided between the display panel 51 and the optical package 1, 2, 3, or 4 as necessary.

  Although the present invention has been described with the embodiment, the modification, and the application example, the present invention is not limited to the embodiment and the like, and various modifications are possible.

  For example, in FIG. 12, instead of the diffusing portion 25 and the light collecting portion 27 of the upper films 22 and 26 of the packaging film, at least one of the polarization separation function, the light source image adjustment function, and the light excitation light emission function is applied to the upper film of the packaging film. Can be given. Alternatively, an optical film having any one of these functions can be provided inside or outside the optical package 1.

  Moreover, in the said embodiment etc., the packaging film 20 wrapped the optical member other than the light guide plate 11 together with the light guide plate 11, but for example, as shown in FIG. Good.

It is a top view showing an example of composition of the upper surface and the undersurface of the optical packing object concerning a 1st embodiment of the present invention. It is sectional drawing of the optical packaged body of FIG. It is a perspective view showing the uneven | corrugated | grooved part of FIG. 2 perspectively. It is sectional drawing of the optical packaging body which concerns on the 2nd Embodiment of this invention. It is a perspective view showing the uneven | corrugated | grooved part of FIG. It is sectional drawing of the optical packaging body which concerns on the 3rd Embodiment of this invention. It is sectional drawing of the 1st modification of the optical packaged body of FIG. It is sectional drawing of the 2nd modification of the optical packaged body of FIG. It is sectional drawing of the 3rd modification of the optical packaged body of FIG. It is sectional drawing of the 4th modification of the optical packaged body of FIG. It is sectional drawing of the 5th modification of the optical packaged body of FIG. It is sectional drawing of the 1st modification of the optical packaged body of FIG. It is sectional drawing of the 2nd modification of the optical packaged body of FIG. It is sectional drawing of the 1st modification of the optical packaged body of FIG. It is sectional drawing of the 6th modification of the optical packaged body of FIG. It is sectional drawing of the optical package which concerns on the 4th Embodiment of this invention. FIG. 17 is a perspective view illustrating a side surface of the optical packaged body of FIG. 16 in an enlarged perspective view. It is sectional drawing of the display apparatus concerning the 1st application example. It is sectional drawing of the display apparatus concerning the 2nd application example. It is sectional drawing of the display apparatus concerning the 3rd application example. It is sectional drawing of the display apparatus concerning the 4th application example. It is sectional drawing of the modification of the optical packaged body of FIG.

Explanation of symbols

  1, 2, 3, 4 ... optical package, 5, 6, 7, 8 ... display device, 10 ... laminate, 11 ... light guide plate, 11A ... upper surface, 11B ... lower surface, 11C ... side surface, 12 ... diffusion sheet, DESCRIPTION OF SYMBOLS 13 ... Condensing sheet | seat, 13A ... Convex part, 14 ... Reflective sheet, 20 ... Packaging film, 20A, 20F ... Joint part, 20B ... Opening part, 20C ... Inner wall surface, 20D ... End face, 20E ... Adhesion part, 21 ... Bottom Side film, 21A ... light incident area, 22,26 ... upper film, 22A ... light emission area, 23,24 ... concave part, 23A, 24A ... ridge line, 23B, 24B ... inclined surface, 25 ... diffusion part, 27 ... collection Optical part, 28 ... reflecting part, 51 ... display panel, 52 ... light source, 53 ... reflecting plate.

Claims (24)

A light guide plate having an upper surface, a lower surface and side surfaces;
A packaging film covering the light guide plate,
The said packaging film is an optical packaging body which is an opposing area | region with the said side surface, and has an uneven | corrugated | grooved part in at least one of the surface by the side of the said light-guide plate among the said packaging films, and the surface on the opposite side to the said light-guide plate.   The said uneven | corrugated | grooved part is comprised by the some convex part continuously arranged in parallel to the direction orthogonal to the thickness direction of the said light-guide plate while extending in the thickness direction of the said light-guide plate. The optical packaging body as described.   The optical package according to claim 2, wherein the plurality of convex portions include a ridge line extending in a thickness direction of the light guide plate and a pair of inclined surfaces formed on both sides of the ridge line.   1. A plurality of optical sheets are provided between at least one of the light guide plate and the packaging film on the upper surface side and between the light guide plate and the packaging film on the lower surface side. The optical packaging body according to 1.   The optical packaging body according to claim 4, wherein the one or more optical sheets have at least one of a diffusion function, a condensing function, a reflection function, a polarization separation function, a light source image adjustment function, and a light excitation light emission function.   The optical packaging body according to claim 1, wherein the packaging film is made of a material having at least one property of heat shrinkability and energy ray shrinkage.   The optical packaging body according to claim 1, wherein the packaging film is in close contact with the light guide plate in a state where tension is applied in an in-plane direction.   The optical packaging body according to claim 1, wherein the packaging film has one or a plurality of openings. A light guide plate having an upper surface, a lower surface and side surfaces;
A packaging film covering the light guide plate,
An optical packaged body in which at least a part of a region facing the side surface of the packaging film is in close contact with the side surface.   The optical packaging body according to claim 9, wherein all or a part of the packaging film that is in close contact with the side surface is bonded to at least one of the side surface, the upper surface, and the lower surface.   The optical packaging body according to claim 10, wherein a part of the packaging film joined to the side surface and the side surface are configured to include a common polymer.   The optical packaging body according to claim 9, comprising an adhesive member between a portion of the packaging film that is in close contact with the side surface and the side surface.   The optical packaging body according to claim 12, wherein the adhesive member includes a heat-sensitive adhesive or an ultraviolet curable resin.   The optical film according to claim 9, wherein the packaging film is formed by collectively bonding the upper film disposed on the upper surface side and the lower film disposed on the lower surface side at a predetermined location. Packaging body.   The optical packaging body according to claim 9, wherein a joint portion between the upper film and the lower film is joined to at least one of the side surface, the upper surface, and the lower surface. A light guide plate having an upper surface, a lower surface and side surfaces;
A packaging film covering the light guide plate,
The said packaging film is an optical packaging body which has 1 or several opening in at least one part of the opposing area | region with the said side surface.   The optical package according to claim 16, wherein the opening is formed in a slit shape in a region facing a light source disposed along the side surface. An optical package;
A light source that emits light toward the optical package,
The optical package is
A light guide plate having an upper surface, a lower surface and side surfaces;
A packaging film covering the light guide plate,
The said packaging film is an illuminating device which is an opposing area | region with the said side surface, and has an uneven | corrugated | grooved part in at least one of the surface by the side of the said light-guide plate among the said packaging films, and the surface on the opposite side to the said light-guide plate.   The illumination device according to claim 18, wherein the light source is disposed in a region facing the uneven portion. An optical package;
A light source that emits light toward the optical package,
The optical package is
A light guide plate having an upper surface, a lower surface and side surfaces;
A packaging film covering the light guide plate,
The illuminating device with which at least one part of the opposing area | region with the said side surface is closely_contact | adhered to the said side surface among the said packaging films. An optical package;
A light source that emits light toward the optical package,
The optical package is
A light guide plate having an upper surface, a lower surface and side surfaces;
A packaging film covering the light guide plate,
The said packaging film is an illuminating device which has 1 or several opening in at least one part of the opposing area | region with the said side surface. A display panel driven based on an image signal;
A light source that emits light to illuminate the display panel;
An optical package provided between the display panel and the light source,
The optical package is
A light guide plate having an upper surface, a lower surface and side surfaces;
A packaging film covering the light guide plate,
The said packaging film is a display apparatus which is an opposing area | region with the said side surface, and has an uneven | corrugated | grooved part in at least one of the surface by the side of the said light-guide plate among the said packaging films, and the surface on the opposite side to the said light-guide plate. A display panel driven based on an image signal;
A light source that emits light to illuminate the display panel;
An optical package provided between the display panel and the light source,
The optical package is
A light guide plate having an upper surface, a lower surface and side surfaces;
A packaging film covering the light guide plate,
The display apparatus with which at least one part of the opposing area | region with the said side surface is closely_contact | adhered to the said side surface among the said packaging films. A display panel driven based on an image signal;
A light source that emits light to illuminate the display panel;
An optical package provided between the display panel and the light source,
The optical package is
A light guide plate having an upper surface, a lower surface and side surfaces;
A packaging film covering the light guide plate,
The said packaging film is a display apparatus which has 1 or several opening in at least one part of the opposing area | region with the said side surface.

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