JP2010042839A - Optical package, illumination device, and display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical package, an illumination device having it, and a display, capable of being thinned while suppressing generation of wrinkles, flexure, and warpage and increase in production cost. <P>SOLUTION: Shrink parts 21B and 22B containing a heat-shrinking material are provided in part of a region of a package film 20 that is opposed to a side surface 11C of a diffusion plate 11. Therefore, a tensile force is applied to the package film 20 with the shrinking parts 21B and 22B in an in-plane direction. An opening 20A is provided at a part of the region opposed to the side surface 11C of the diffusion plate 11, wherein the part is adjacent to the shrinking parts 21B and 22B. Therefore, when the shrinking parts 21B and 22B shrink in a manufacturing process, compression stress can be prevented from being applied to the part of the package film 20 adjacent to the shrinking parts 21B and 22B in the in-plane direction along with the shrinkage of the shrinking parts 21B and 22B. <P>COPYRIGHT: (C)2010,JPO&INPIT

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 and a direct type illumination device in which a light source and a plurality of optical elements are arranged directly below a liquid crystal panel (see Patent Document 1).

  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 and the diffusion plate. 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, as described in Patent Document 1, 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 lighting device becomes thicker 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.

  Therefore, instead of using a transparent adhesive, it is conceivable to wrap a laminate composed of a diffusion plate and all optical sheets with a transparent packaging film. An optical package in which a laminate is wrapped with a packaging film can be produced, for example, as follows. First, two heat-shrinkable films are disposed one above the other of the laminate, and then the entire edges of the two heat-shrinkable films are bonded together by welding or the like. Next, heat is applied to the entire two heat-shrinkable films to shrink the two heat-shrinkable films. In this way, it is possible to produce the packaging film.

  By the way, in the above-mentioned manufacturing method, when shrinking two heat-shrinkable films, it is necessary to apply heat to the whole two heat-shrinkable films. However, when heat is applied to the entire heat-shrinkable film, there is a problem that the optical sheet cannot be made thinner than a predetermined thickness in order to prevent the optical sheet in the packaging film from being bent by the heat. There is. Further, in order to apply heat to the entire two heat-shrinkable films, enormous amount of power is required, so it is necessary to prepare equipment capable of supplying such high power. Therefore, there also exists a problem that the manufacturing cost of an illuminating device will raise significantly.

  The present invention has been made in view of such problems, and an object of the present invention is to provide an optical packaging body that can be thinned while suppressing generation of wrinkles, deflection, warpage, and an increase in manufacturing cost, and the same. Another object is to provide a lighting device and a display device.

  The optical package of the present invention comprises a support having an upper surface, a lower surface and side surfaces, and a packaging film covering the support. The packaging film has a contraction portion containing a heat-shrinkable material in a region facing the side surface, and has an opening in a portion adjacent to the contraction portion in the region facing the side surface. The packaging film is in close contact with the support due to the tension by the contraction portion.

  The illuminating device of this invention is equipped with the said optical package and the light source which inject | emits light toward the said optical package. The display device of the present invention includes a display panel that is driven based on an image signal, a light source that emits light that illuminates the display panel, and the optical packaging body that is provided between the display panel and the light source. It is a thing.

  In the optical packaging body, the lighting device, and the display device of the present invention, a shrinking portion including a heat-shrinkable material is provided in a region facing the side surface of the packaging film. Thereby, a tensile stress (so-called tension) is applied to the packaging film in the in-plane direction by the contraction portion. In addition, an opening is provided in a portion adjacent to the contraction portion in the region facing the side surface. Thereby, when a contraction part contracts in a manufacturing process, it is prevented that a compressive stress is applied to a portion adjacent to a contraction part in a packaging film in the in-plane direction with contraction of the contraction part. By the way, in this invention, as above-mentioned, the shrinkage | contraction part is provided in a part of area | region facing a side surface among packaging films. Thereby, in the manufacturing process, it is only necessary to apply heat to the shrinkage portion of the packaging film, so it is not necessary to increase the heat resistance of the inclusions in the packaging film, and no enormous power is required.

  According to the optical packaging body, the illumination device, and the display device of the present invention, the shrinkage portion including the heat-shrinkable material is provided in the region facing the side surface of the packaging film, and the shrinkage portion is included in the region facing the side surface. Since the opening is provided in the adjacent portion, it is possible to apply tension while preventing the compressive stress from being applied to the packaging film. As a result, the wrapping film adheres to the support in a tensioned state, so that even if the wrapping film is thin, wrinkles, deflections, and warpage may occur in the inclusions and wrapping film in the wrapping film. Can be eliminated. In addition, in the manufacturing process, it is only necessary to apply heat to the contracted portion of the packaging film, so that it is not necessary to thicken the inclusions in the packaging film or to prepare equipment capable of supplying high power. As a result, an increase in manufacturing cost can be suppressed. As described above, in the present invention, it is possible to reduce the thickness while suppressing generation of wrinkles, deflection, warpage, and increase in manufacturing cost.

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

  FIG. 1 is a perspective view showing an example of an optical package 1 according to an embodiment of the present invention. FIG. 2 is a perspective view of the diffusion plate 11 (described later) in the optical package 1 of FIG. FIG. 3A illustrates an example of a top surface configuration of the optical package 1 of FIG. FIG. 3B illustrates an example of a lower surface configuration of the optical package 1 in FIG. FIG. 4 illustrates an example of a cross-sectional configuration of the optical package 1 in FIG. The optical package 1 is suitably used for, for example, a direct-type illumination device including a display panel driven based on an image signal and a light source disposed immediately below the display panel.

  As shown in FIGS. 1 and 4, the optical package 1 includes a diffusion plate 11 (support) and a packaging film 20.

  The diffusion plate 11 has a shape corresponding to the display panel, for example, a rectangular shape surrounded by the upper surface 11A, the lower surface 11B, and the side surface 11C as shown in FIG. The upper surface 11A and the lower surface 11B face each other. The side surface 11C has a pair of side surfaces 11C-1 (first side surface) facing each other and a pair of side surfaces 11C-2 (second side surface) facing each other. Each side surface 11C-1 has a belt-like shape extending in the lateral direction (a direction orthogonal to the normal line of the upper surface 11A). Each side surface 11C-2 has a strip shape extending in a direction intersecting (orthogonal) with the extending direction of the side surface 11C-1, and the end portion 11E of each side surface 11C-2 is the end portion of the side surface 11C-1. It is in contact with 11D.

  The diffusing plate 11 is a thick and highly rigid optical sheet having a light diffusing layer formed by dispersing a light diffusing material (filler) inside a relatively thick plate-like transparent resin, for example. For example, the diffusion plate 11 may be 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 packaging body 1 or a support body that supports the packaging film 20. Function.

  Here, as the plate-like transparent resin, for example, a light-transmitting thermoplastic resin such as PET, acrylic, or polycarbonate is used. However, considering the heat resistance during heat shrinkage, the plate-like transparent resin is a resin having a high glass transition temperature, for example, a polycarbonate resin, a polystyrene resin, or a styrene copolymer with a vinyl monomer copolymerizable with polystyrene-styrene. It is preferable to use a coalesced polyolefin resin (Zeonor). The light diffusion layer included in the diffusion plate 11 has a thickness of 0.5 mm or more and 5 mm or less, for example. The light diffusing material is made of particles having an average particle diameter of, for example, 0.5 μm or more and 10 μm or less, and in the transparent resin in the range of 0.1 parts by weight or more and 10 parts by weight or less with respect to the total weight of the light diffusing layer. Are distributed. Examples of the light diffusing material include organic fillers and inorganic fillers, but hollow particles may be used as the light diffusing material. Thereby, the diffusion plate 11 has a function of diffusing light from the light source and return light from the diffusion sheet 12 side. Note that a three-dimensional shape may be formed on the light incident surface or the light emitting surface of the diffusing plate 11 using the above-described light diffusing material or the like.

  When the light diffusion layer is thinner than 0.5 mm, the light diffusibility is impaired, and there is a possibility that the sheet rigidity cannot be secured when the diffusion plate 11 is supported by the housing. Further, if the light diffusion layer is thicker than 5 mm, it is difficult to dissipate the heat when the diffusion plate 11 is heated by light from the light source, and the diffusion plate 11 may be bent. The average particle diameter of the light diffusing material is in the range of 0.5 to 10 μm, and the light diffusing material is dispersed in the transparent resin in the range of 0.1 to 10 parts by weight with respect to the total weight of the light diffusing layer. In the case where the light is diffused, the effect as a light diffusing material is efficiently exhibited, and uneven brightness can be eliminated.

  The packaging film 20 has, for example, a light incident side film 21 (lower film) on the lower surface side of the diffusion plate 11 and light on the upper surface side of the diffusion plate 11 as shown in FIGS. 1, 3, and 4. The injection side film 22 (upper film) is included. The light incident side film 21 is bonded to the bonding portion 22A of the light emitting side film 22 in a part of a region facing the side surface 11C of the diffusion plate 11 when viewed from the normal direction of the diffusion plate 11. 2nd junction part). In addition, the light emission side film 22 is joined to the light incident side film 21 in a part of a region facing the side surface 11C of the diffusion plate 11 when viewed from the normal line direction of the diffusion plate 11 (first portion). It has a joint part). As shown in FIG. 3, the joining portions 21A and 22A are formed outside the light incident region 21C (second region) of the light incident side film 21 and the light emitting region 22C of the light emitting side film 22 (first region). For example, as shown in FIG. 1 and FIG. 4, it extends in the longitudinal direction of the side surface 11 </ b> C- 1 in a region facing the pair of side surfaces 11 </ b> C- 1.

  The light incident side film 21 has a contraction part 21 </ b> A in a part of a region facing the side surface 11 </ b> C of the diffusion plate 11 when viewed from the normal direction of the diffusion plate 11. Moreover, the light emission side film 22 has the contraction | shrink part 22A in a part of area | region facing 11 C of side surfaces. For example, as shown in FIG. 1, the contraction portions 21A and 22A are formed in a band-like region extending from the vicinity of one end portion in the longitudinal direction of the side surface 11C to the vicinity of the other end portion in the longitudinal direction of the side surface 11C. ing. The contraction portions 21A and 22A mainly include a heat-shrinkable material. The contraction part 21 </ b> A is provided in a part including the joint part 21 </ b> A in the light incident side film 21, and the contraction part 22 </ b> A is provided in a part including the joint part 22 </ b> A in the light emission side film 22. That is, the contraction part 21A and the contraction part 22A are joined to each other at the joint parts 21A and 22A.

  As will be described later, the contracted portion 21A and the contracted portion 22A are formed by thermally contracting the contracted portions 21D and 22D containing a heat-shrinkable material, and the light incident side film 21 and the light emitting side film 22 are formed. Among them, tensile stress (tension) is applied in the in-plane direction to the portions other than the contracted portion 21A and the contracted portion 22A. Therefore, the packaging film 20 is in close contact with the diffusion plate 11 due to the tension.

  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.

  By the way, as a heat-shrinkable material contained in the contraction part 21A and the contraction part 22A, for example, polyolefin resins such as polyethylene (PE) and polypropylene (PP), polyethylene terephthalate (PET), and polyethylene naphthalate (PEN) are used. Polyester resins, polystyrene bonds (PS) and polyvinyl alcohol (PVA) and other vinyl bonds, polycarbonate (PC) resins, cycloolefin resins, urethane resins, vinyl chloride resins, natural rubber resins, and artificial rubber resins Etc. can be used alone or in combination. Typically, biaxially oriented polypropylene (OPP), styrene-butadiene block copolymer (SBC), nylon, A-PET, biaxially oriented PEN, etc. are used. Can do. As the heat-shrinkable material, it is preferable to use a polymer material that does not shrink when heated from room temperature to 85 ° C.

  It is preferable to use a uniaxially stretched or biaxially stretched (biaxial sequential, biaxial simultaneous) sheet or film as the contraction portions 21A and 22A. 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.

  The thermal contraction rate of the contracted portions 21A and 22A needs to take into consideration the size, material, usage environment, and the like of the diffusing plate 11 to be included, but it should be 0.2% or more and 100% or less at 90 ° C. Is preferably 0.5% or more and 20% or less, and more 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.

  Further, the loss on drying of the packaging film 20 is preferably 2% or less. The thermal expansion coefficient of the entire packaging film 20 including the contracted portions 21 </ b> A and 22 </ b> A is smaller than the thermal expansion coefficient of the diffusion plate 11 wrapped in the packaging film 20 from the viewpoint of improving the adhesion between the packaging film 20 and the diffusion plate 11. Is preferred. 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 diffusion plate 11. On the other hand, if the thickness exceeds 200 μm, it is difficult for the packaging film 20 to be in close contact with the edge of the diffusion plate 11 when the shrinking portions 21A and 22A are thermally shrunk, and there is a concern that the packaging film 20 may rise in the vicinity thereof. 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, it is easy to bring the diffusion plate 11 and the packaging film 20 into close contact with each other, and further 5 μm to 50 μm. In the case described below, the diffusion plate 11 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 the shape change of the diffusion plate 11 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.

  Moreover, it is preferable that the packaging film 20 has a light-diffusion function, for example, it is preferable to contain 1 type, or 2 or more types of light-diffusion materials (fine particle). 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 packaging film 20 may contain fine particles having the same diameter, or may contain fine particles having a plurality of types of diameters.

  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.

  Moreover, the packaging film 20 has an opening 20A in a portion adjacent to the contracting portions 21B and 22B in a region facing the pair of side surfaces 11C-2. For example, as illustrated in FIGS. 1 and 3, the opening 20 </ b> A has a belt-like shape extending in the longitudinal direction of the side surface 11 </ b> C- 2 from the vicinity of the end portions in the longitudinal direction of the contracting portions 21 </ b> B and 22 </ b> B. . In FIG. 1 and FIG. 3, the opening 20A is formed from the end of one contraction part 21B, 22B to the end of the other contraction part 21B, 22B. Although the case where it exposes is illustrated, it may be a form other than that. For example, although not shown, the opening 20A is separately formed at two locations, near the end of one contraction portion 21B, 22B and near the end of the other contraction portion 21B, 22B. A central portion in the direction may be covered with the packaging film 20.

  Next, with reference to FIG. 5, an example of the manufacturing method of the optical package 1 of this Embodiment is demonstrated.

  First, a light incident side film 21 and a light emission side film 22 that are uniaxially or biaxially stretched are prepared using a stretching machine. And using the machine (not shown) which sends out a film, the light incident side film 21 is sent out from a roll, and the diffuser plate 11 prepared separately is mounted in the predetermined position on the light incident side film 21. FIG.

  Next, using a machine (not shown) for feeding out the film, the light emission side film 22 is sent out from the roll and placed so as to cover the upper surface of the diffusion plate 11. Here, it is desirable that the widths of the light incident side film 21 and the light emitting side film 22 are substantially equal to or slightly larger than the width of the diffusion plate 11.

  Next, in a state where the diffusion plate 11 is sandwiched between the films 21 and 22, the films 21 and 22 are welded (joined) to each other at a predetermined position and cut using a welding cutter 30 (see FIG. 5A). To do. Thereby, 20 A of junction parts are formed in the edge part of the films 21 and 22, and the part which is not welded among the edge parts of the films 21 and 22 becomes the opening 20A.

  Next, as shown in FIG. 5B, the light incident side film 21 and the light emission side film are used by using the heaters 40 arranged at the ends of the light incident side film 21 and the light emission side film 22. Heat is locally applied to a part of the end portion 22 (the entire contracted portions 21B and 22B in FIG. 5B) to contract the contracted portions 21B and 22B. 5B illustrates the case where heat is applied to the entire contracted portions 21B and 22B, but the contracted portions 21B and 22B are formed on the light incident side film 21 and the light emitting side film 22. When it is provided at both ends, heat may be applied to only one of them. Thus, by applying heat only to part of the end portions of the light incident side film 21 and the light emitting side film 22 to contract the contraction portions 21B and 22B, the contraction portions 21B and 21B of the packaging film 20 are contracted. The portions other than 22B are pulled by the contracting force of the contracting portions 21B and 22B, and the packaging film 20 is brought into close contact with the diffusion plate 11 in a state where tension is applied in the in-plane direction. In this way, the optical package 1 of the present embodiment is manufactured.

  Next, the operation of the optical package 1 manufactured as described above will be described. When a light source is arranged on the light incident side film 21 side of the optical packaging body 1 and non-polarized light is irradiated from the light source toward the optical packaging body 1, the light from the light source passes through the light incident side film 21, The transmitted light is diffused by the diffusion plate 11. Thereby, the in-plane luminance distribution is made uniform. Thereafter, the light diffused by the diffusing plate 11 passes through the film 22 on the light emitting side and is emitted to the outside. In this way, the light from the light source is adjusted to light having a desired front luminance, in-plane luminance distribution, viewing angle, and the like.

  By the way, in this Embodiment, shrinkage | contraction part 21B and 22B containing a heat-shrinkable material are provided in a part (for example, area | region facing the side surface 11C-1) of the packaging film 20 in the area facing the side surface 11C. Yes. Thereby, a tensile stress (so-called tension) is applied to the packaging film 20 in the in-plane directions of the light incident side film 21 and the light emitting side film 22 by the contraction portions 21B and 22B. In addition, an opening 20A is provided in a portion adjacent to the contracted portions 21B and 22B in a region facing the side surface 11C-2. Thereby, when the contracting portions 21B and 22B contract in the manufacturing process, a compressive stress is applied to the portion of the packaging film 20 adjacent to the contracting portions 21B and 22B in the in-plane direction as the contracting portions 21B and 22B contract. This is prevented. Accordingly, it is possible to apply tension to the packaging film 20 while preventing the packaging film 20 from being subjected to compressive stress, which causes wrinkles, so that the packaging film 20 can be diffused without generating wrinkles. It can be brought into close contact with the plate 11. Moreover, since tension is applied to the packaging film 20, there is no possibility that wrinkles are generated in the packaging film 20 even when the packaging film 20 is thinned. Moreover, in this Embodiment, since the diffusing plate 11 which functions as a support body is provided in the packaging film 20, there is no fear that the optical packaging body 1 is bent or warped by the tension of the film 20. Therefore, there is no possibility that wrinkles, deflection, or warpage will occur in the inclusion (the diffusion plate 11) of the packaging film 20 or the packaging film 20.

  In addition, as described above, in the manufacturing process, the contracting portions 21B and 22B are contracted by locally applying heat only to part of the end portions of the light incident side film 21 and the light emitting side film 22. There is no need to thicken the diffusing plate 11 in the packaging film 20 or to prepare equipment capable of supplying large power. As a result, an increase in manufacturing cost can be suppressed. As described above, in this embodiment, it is possible to reduce the thickness while suppressing generation of wrinkles, deflection, warpage, and an increase in manufacturing cost.

(Modification 1)
In the said embodiment, although the case where the shrinkage | contraction part (21B, 22B) was provided in the edge part of both the light-incidence side film 21 and the light emission side film 22 was illustrated, for example, it shows in FIG. As described above, the contraction portions (21 B) may be provided only at both end portions of the light incident side film 21. Further, for example, contraction portions (22B) may be provided only at both end portions of the film 22 on the light emission side. Further, for example, the contraction portions (21B, 22B) may be provided only at one end portion of the light incident side film 21 and the light exit side film 22 that are in contact with each other. Further, for example, the contraction portion (21 B) may be provided only at one end portion of the light incident side film 21. Further, for example, the contraction part (22B) may be provided only at one end of the film 22 on the light emission side. Further, for example, the contraction part (21 </ b> B) may be provided for the entire light incident side film 21. Further, for example, the contraction portion (22B) may be provided for the entire film 22 on the light emission side. Further, for example, the contraction part (21 B) may be provided for the entire light incident side film 21, and the contraction part (22 B) may be provided for the entire light emission side film 22. In the case where the contraction portions 21B and 22B are formed on the entire light incident side film 21 or the entire light emission side film 22, one side of the light incident side film 21 and the light emission side film 22 or Heat should be applied only to the two sides to contract the contraction parts 21B and 22B.

(Modification 2)
Moreover, in the said embodiment, although only the diffusion plate 11 was included in the packaging film 20, between the part (light incident side film 21) of the upper surface 11A side and the diffusion plate 11 among the packaging films 20, and One or more optical sheets may be provided on at least one of the wrapping film 20 between the portion on the lower surface 11B side (the film 22 on the light emission side) and the diffusion plate 11. The one or more optical sheets have, for example, at least one of a diffusion function, a condensing function, a polarization separation function, a light source image adjustment function, and a light excitation light emission function.

  For example, as shown in FIG. 7, the optical packaging body 1 includes a laminated body 10 including a diffusion plate 11, a diffusion sheet 12, a lens film 13, a reflective polarizing sheet 14, and a light source image adjustment sheet 15 with a packaging film 20. It is formed by doing. The optical package 1 includes a diffusion sheet 12, a lens film 13, and a reflective polarizing sheet 14 between a portion on the upper surface 11A side (light incident side film 21) of the packaging film 20 and the diffusion plate 11, and packaging. A light source image adjustment sheet 15 is provided between a portion of the film 20 on the lower surface 11B side (film 22 on the light emission side) and the diffusion plate 11.

  Here, the diffusion sheet 12 is a thin optical sheet formed by, for example, applying a transparent resin containing a light diffusing 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.

  In the lens film 13, a plurality of convex portions 13 </ b> A extending along a plane parallel to the surface (lower surface) on the diffusion plate 11 side are continuously arranged on the surface (upper surface) on the reflective polarizing sheet 14 side. It is a thin optical sheet. Each protrusion 13A is formed, for example, extending in a direction parallel to the longitudinal direction of the side surface 11C-1 of the diffusion plate 11, and continuously arranged in a direction intersecting the extending direction. Yes. As illustrated in FIG. 7, the extending direction of each convex portion 13 </ b> A preferably extends in a direction parallel to the extending direction of convex portions 15 </ b> A (described later) of the light source image adjusting sheet 15. In addition, when the optical package 1 is mounted on a display device or the like, the lens film 13 is horizontal when the side surface 11C-1 extending in the longitudinal direction is parallel to the horizontal direction. From the viewpoint of securing the viewing angle, it is preferable that the extending direction of each convex portion 13A is arranged in parallel with the horizontal direction.

  The surface of each convex portion 13A is configured by at least one of a curved surface and a plurality of flat surfaces. For example, when each convex portion 13A has a triangular prism shape with an apex angle of 90 °, the surface of each convex portion 13A is composed of two flat surfaces (inclined surfaces) with a base angle (inclination angle) of 45 °. ing. Further, for example, when each convex portion 13A has a polygonal prism shape having a convex curved surface at the top, the surface of each convex portion 13A is composed of a curved surface and two planes (inclined surfaces). Has been.

  The lens film 13 may be integrally formed using a resin material having translucency, for example, a thermoplastic resin, or on a translucent substrate, for example, PET (polyethylene terephthalate). It may be formed by transferring an energy ray (for example, ultraviolet ray) curable resin. Here, considering the function of controlling the light emission direction, it is preferable to use a thermoplastic resin having a refractive index of 1.4 or more. Examples of such resins include polycarbonate resins, acrylic resins such as PMMA (polymethyl methacrylate resin), polyester resins such as polyethylene terephthalate, and amorphous copolymer polyesters such as MS (a copolymer of methyl methacrylate and styrene). Examples thereof include resins, polystyrene resins, and polyvinyl chloride resins.

  The reflective polarizing sheet 14 has, for example, a multilayer structure (not shown) in which layers having different refractive indexes are alternately stacked. The lens film 13 separates light with enhanced directivity by ps and uses p-waves. Only s-waves are selectively reflected. The reflected s-wave is reflected again by a reflection sheet or the like disposed behind the light source, and is divided into a p-wave and an s-wave at that time. Therefore, the s-wave reflected by the reflective polarizing sheet 14 is reused. Can do. The reflective polarizing sheet 14 is further formed by sandwiching the multilayer structure between a pair of diffusion sheets, and by diffusing the p-wave transmitted through the multilayer film with the diffusion sheet in the reflective polarizing sheet 14, The viewing angle is widened.

  In addition, when a liquid crystal panel (polarizer) is present outside the optical package 1 and close to the light emission region 22C, or inside the optical package 1 and in the light emission region 22C. When the reflective polarizing sheet 14 or the lens sheet 13 is present at a close position, it is preferable to reduce the phase difference of the light exit side film 22 in order to reduce luminance unevenness. Specifically, the retardation of the wrapping film 20 with respect to the transmission axis of the polarizer provided on the light incident side of the liquid crystal panel and the optical axis of the reflection side polarizing sheet 14 is (1/50) π of the wavelength of the incident light. The following is preferable. Note that the phase difference delay described above is a phase difference delay with respect to the transmission axis of the polarizer provided on the light incident side of the liquid crystal panel and the optical axis of the reflection side polarizing sheet 14. The phase difference delay of the covering film 20 may be different between the exit side and the entrance side. In such a case, at least on the exit side of the packaging film 20, the phase difference with respect to the optical axis of the reflective polarizing sheet 14. It is desirable that the delay is (1/50) π or less.

  Examples of the material of the packaging film 20 include polycarbonate, vinyl aromatic hydrocarbon such as polystyrene, block copolymer of vinyl aromatic hydrocarbon and conjugated diene such as styrene-butadiene block copolymer, polypropylene, polyethylene, cyclohexane. Examples include olefin primer systems and triacetyl cellulose systems.

  If the packaging film 20 has a slight birefringence, the value is uniform over the entire light emitting surface of the packaging film 20, and the polarization axis is uniform over the entire light emitting surface of the packaging film 20. It is desirable that This is to prevent the polarization axis from rotating by making the polarization axis approximately parallel to the transmission axis of the polarizer provided on the light source side of the liquid crystal panel or the optical axis of the reflective polarizing sheet 14. is there.

  For example, as illustrated in FIG. 7, the light source image adjustment sheet 15 includes a plurality of linear or pyramidal convex portions 15 </ b> A in the light incident region 21 </ b> C (directly below the diffusion plate 11). When the light source arranged immediately below the laminate 10 is a plurality of linear light sources extending in one direction orthogonal to the laminate direction of the laminate 10 (for example, the longitudinal direction of the diffusion plate 11), a plurality of convex As shown in FIG. 7, the portion 15 </ b> A has a linear shape (columnar shape) extending in a predetermined direction orthogonal to the stacking direction of the stacked body 10, and is continuous in the direction intersecting with the extending direction. Are preferably arranged side by side. At this time, the extending direction of each convex portion 15A is preferably parallel to the extending direction of each linear light source, but intersects the extending direction of each linear light source within an allowable range in terms of optical characteristics. It may be arranged as follows. The convex portion 15A may have a polygonal column shape, or the surface of the convex portion 15A may be a curved surface. Further, when the light source arranged immediately below the laminated body 10 is a plurality of point light sources arranged in one plane having a normal line parallel to the lamination direction of the laminated body 10, a plurality of convex portions 15A. Although not shown, it is preferably in the shape of a cone, and is continuously arranged two-dimensionally in the light incident region 21C. However, a plurality of convex portions having a linear shape (columnar shape) extending in a direction orthogonal to the extending direction of the convex portion 15A are provided between the diffusion plate 11 and the light source image adjusting sheet 15. When the light source image adjusting sheets arranged in parallel in the direction orthogonal to the extending direction are provided, the plurality of convex portions 15A are linear shapes extending in a predetermined direction orthogonal to the stacking direction of the stacked body 10. (Columnar shape) is preferable.

  As a result, the light source image adjustment sheet 15 refracts and transmits light incident on the lower surface or the upper surface of the light emitted from one light source at an angle less than the critical angle, while entering light incident at an angle greater than the critical angle. Thus, the maximum value and the minimum value of the luminance level of the light source image can be reduced, and unevenness in illumination luminance can be reduced. Note that the light source image represents a light flux that exhibits a luminance peak in the luminance distribution of light.

  Next, the operation of this modification will be described. When a light source is arranged on the light source image adjustment sheet 15 side of the optical package 1 according to this modification and non-polarized light is irradiated from the light source toward the optical package 1, the light from the light source is the light source image adjustment sheet 15. The brightness unevenness between the light source images is adjusted by the above, and the light source image obtained by the adjustment is diffused by the diffusion plate 11 and the diffusion sheet 12. As a result, the in-plane luminance distribution becomes uniform. Thereafter, the front luminance is increased by the light collecting action of the lens film 13, and then the light collected by the lens film 13 is polarized and separated by the reflective polarizing sheet 14, the viewing angle is widened, and emitted to the outside. . In this way, the light from the light source is adjusted to light having a desired front luminance, in-plane luminance distribution, viewing angle, and the like.

  By the way, in this modification, tension can be applied to the packaging film 20 while preventing the compressive stress that causes wrinkles on the packaging film 20 from being applied to the packaging film 20. The packaging film 20 can be brought into close contact with the diffusion plate 11 without generating wrinkles. Moreover, since tension is applied to the packaging film 20, there is no possibility that wrinkles are generated in the packaging film 20 even when the packaging film 20 is thinned. Also in this modified example, since the diffusing plate 11 that functions as a support is provided in the packaging film 20, there is no possibility that the optical packaging body 1 is bent or warped by the tension of the film 20. Therefore, there is no possibility that wrinkles, deflection, or warpage will occur in the inclusion of the packaging film 20 or the packaging film 20.

  Moreover, also in this modification, since it is not necessary to thicken the diffusion plate 11 in the packaging film 20 or to prepare equipment capable of supplying high power, an increase in manufacturing cost can be suppressed. As described above, also in this modification, it is possible to reduce the thickness while suppressing generation of wrinkles, deflection, warpage, and an increase in manufacturing cost.

(Modification 3)
Moreover, in the said embodiment and the said modification, when the light source is arrange | positioned directly under the diffusion plate 11 in the packaging film 20, the light incident area | region 21C into which the light from a light source injects, and the light from a light source are said optical packaging You may make it provide the optical function part which acts with respect to the light from a light source in at least one area | region of the light emission area | region 22C which passes through the body 1 and inject | emits. The optical function unit has, for example, at least one of a diffusion function, a light collection function, a polarization separation function, a light source image adjustment function, and a light excitation light emission function, and a display panel (not shown) is provided immediately above the packaging film 20. ) Is formed over the entire area corresponding to the display area of the display panel. In addition, it is preferable that the optical function part is integrally formed with parts other than the said optical function part among the packaging films 20 from a viewpoint of simplifying a manufacturing process, preventing generation | occurrence | production of a wrinkle, a bending, and a curvature.

  For example, as illustrated in FIG. 8, the light source image adjusting unit 23 can be provided as an optical function unit in the light incident region 21 </ b> C on the packaging film 20. The light source image adjusting unit 23 has a plurality of linear or pyramidal convex portions 23A on at least one of the surface on the diffusion plate 11 side and the surface opposite to the diffusion plate 11 in the light incident region 21C. ing. FIG. 8 illustrates the case where the light source image adjusting unit 23 is provided on the surface on the diffusion plate 11 side in the light incident region 21A. FIG. 8 illustrates the case where the light source image adjusting unit 23 is formed integrally with the light incident side film 21, but is formed separately (attached) from the light incident side film 21. May be.

  Here, when the light source arranged immediately below the diffusion plate 11 is a plurality of linear light sources extending in one direction orthogonal to the normal direction of the diffusion plate 11 (for example, the longitudinal direction of the diffusion plate 11). As shown in FIG. 8, the plurality of convex portions 23 </ b> A have a linear shape (columnar shape) extending in a predetermined direction orthogonal to the normal direction of the diffusion plate 11, and the extending direction thereof It is preferable that they are arranged side by side continuously in a direction intersecting with. At this time, the extending direction of each convex portion 23A is preferably parallel to the extending direction of each linear light source, but intersects the extending direction of each linear light source within an allowable range in terms of optical characteristics. It may be arranged as follows. The convex portion 23A may have a polygonal column shape, or the surface of the convex portion 23A may be a curved surface. Further, when the light source arranged immediately below the diffusion plate 11 is a plurality of point light sources arranged in one plane having a normal parallel to the normal direction of the diffusion plate 11, a plurality of convex portions Although not shown, 23A has a conical shape and is continuously two-dimensionally arranged on at least one of the surface on the diffusion plate 11 side and the surface opposite to the diffusion plate 11 in the light incident region 21C. It is preferable.

Thereby, for example, the light source image adjusting unit 23 refracts and transmits light incident on the lower surface or the upper surface of the light emitted from one light source at an angle less than the critical angle, while entering light incident at an angle greater than the critical angle. Therefore, the difference between the maximum value and the minimum value of the luminance level of the light source image can be reduced, and the unevenness of the illumination luminance can be reduced.

  Further, for example, a three-dimensional shape can be provided as an optical function portion in the light emission region 22C of the packaging film 20. This three-dimensional shape is provided, for example, on at least one of the surface on the laminated body 10 side and the surface opposite to the laminated body 10 in the light emission region 22C, and is in one direction (for example, the longitudinal direction of the diffusion plate 11). And a plurality of convex portions continuously arranged in parallel in a direction intersecting with the extending direction.

  Each of the convex portions has, for example, a triangular prism shape having two inclined surfaces that are in contact with the apex angle, and these inclined surfaces are arranged to be diagonally opposed to the surface including the film 22 on the light emission side. ing. In addition, the shape of each convex part is not limited to the triangular prism shape, and may be, for example, a polygonal prism shape such as a pentagonal prism shape, or in a direction orthogonal to the extending direction of each convex part. Further, it may have a curved surface shape (for example, a cylindrical shape) such as an elliptical shape and an aspherical shape. Thereby, each convex part refracts and transmits the component in the arrangement direction of each convex part in the light incident from the back side of the film 22 on the light exit side toward the direction intersecting the stacking direction of the laminate 10. Increases sex.

  The convex portion may further have a polarization separation function in the whole or a part of the light emission region 22C. For example, as illustrated in FIG. 9, a polarization separation portion 24 in which a plurality of convex portions 24 </ b> A having a polarization separation function are arranged in parallel may be provided on the entire light emission region 22 </ b> C of the packaging film 20.

  Each convex portion 24A has a refractive index anisotropy in which the refractive index in one direction is larger than the refractive index in the direction orthogonal to the one direction. For example, the refractive index in the extending direction of each convex portion 24A is larger than the refractive index in the arrangement direction of each convex portion 24A, or the refractive index in the extending direction of each convex portion 24A is that of each convex portion 24A. It is smaller than the refractive index in the arrangement direction.

  Here, the in-plane anisotropy of the refractive index can be expressed by stretching a sheet containing a semicrystalline or crystalline resin in one direction. For semi-crystalline or crystalline resins, a resin in which the refractive index in the stretching direction is larger than the refractive index in the direction perpendicular to the stretching direction, or the refractive index in the stretching direction is greater than the refractive index in the direction perpendicular to the stretching direction. There are small resins. Examples of a material exhibiting positive birefringence that increases the refractive index in the stretching direction include, for example, PET (polyethylene terephthalate), PEN (polyethylene naphthalate), a mixture thereof, or a copolymer such as PET-PEN copolymer, polycarbonate, and the like. , Polyvinyl alcohol, polyester, polyvinylidene fluoride, polypropylene, polyamide and the like. On the other hand, examples of the material exhibiting negative birefringence in which the refractive index in the stretching direction is small include methacrylic resins, polystyrene resins, styrene-methyl methacrylate copolymers, and mixtures thereof.

  Note that the in-plane anisotropy of the refractive index can also be expressed by using, for example, a crystal material having a refractive index anisotropy. Further, from the viewpoint of simplifying the manufacturing process, it is preferable that the entire polarized light separating portion 24 is made of the same material, but for example, each convex portion 24A and other portions may be made of different materials. Good.

  Next, the function of the polarization separation unit 24 when the refractive index of the entire polarization separation unit 24 is different between the extending direction of each projection 24A and the arrangement direction of each projection 24A will be described.

  The light from the light source incident from the oblique direction with respect to the surface including the polarization separation unit 24 has different refractive indexes of the convex portions 24A in the extending direction of the convex portions 24A and the arrangement direction of the convex portions 24A. Accordingly, the X-direction polarization component Lx and the Y-direction polarization component Ly of the light from the light source are refracted at different refraction angles rx and ry on the back surface of the polarization separation unit 24, and the polarization separation unit 24 at different exit angles φx and φy. From the surface (light exit surface of each convex portion 24A).

  At this time, since the polarization separation unit 24 has different refractive indexes in the extending direction of the convex portions 24A and the arrangement direction of the convex portions 24A, the polarization component that vibrates in these directions is the polarization separation unit 24. Are reflected at different reflectivities at the interface such as the back surface of the projection and the light exit surface of the convex portion 24A. Accordingly, when the refractive index nx in the extending direction of each convex portion 24A is larger than the refractive index ny in the arrangement direction of each convex portion 24A in the entire polarization separating section 24, the amount of reflection of the X-direction polarization component Lx. Becomes larger than the reflection amount of the Y-direction polarization component Ly. Therefore, in the light transmitted through the polarization separation unit 24, the light amount of the Y-direction polarization component Ly is larger than the light amount of the X-direction polarization component Lx.

  In addition, since the polarization separation unit 24 has different refractive indexes in the extending direction of the convex portions 24A and the arrangement direction of the convex portions 24A, the polarization component that vibrates in these directions is the polarization separation unit 24. Have different critical angles at the interfaces such as the back surface and the light incident surface of the convex portion 24A. Therefore, when the incident light at an incident angle has an incident angle on the light exit surface larger than the critical angle of Lx and smaller than the critical angle of the Y-direction polarization component Ly, the X-direction polarization component Lx Are totally reflected and the Y-direction polarization component Ly is transmitted. Therefore, the X-direction polarization component Lx repeats total reflection at the light exit surface of each convex portion 24A to become return light, and only the Y-direction polarization component Ly has a complete polarization separation state that passes through the light exit surface of each convex portion 24A. Can be realized.

  If the incident angle of light from the light source on the light exit surface of each convex portion 24A becomes too large, the light from the light source repeats total reflection on the light exit surface of each convex portion 24A regardless of the polarization state. The return light returns to the light source side.

  As described above, the polarization separation unit 24 has a certain polarization separation action in addition to the light collection action. Thereby, the use efficiency of light becomes higher than the case where the polarization separation unit 24 does not have a polarization separation action, and the front luminance is improved.

  Further, for example, the light source image adjustment unit 23 is provided as an optical function unit in the light incident region 21 </ b> C, and the light emitting region 22 </ b> C of the packaging film 20 is provided with a three-dimensional shape as the optical function unit. Is possible.

  This three-dimensional shape is provided, for example, on at least one of the surface on the laminated body 10 side and the surface opposite to the laminated body 10 in the light emission region 22C, and is in one direction (for example, the longitudinal direction of the diffusion plate 11). And a plurality of convex portions continuously arranged in parallel in a direction intersecting with the extending direction.

  Each of the convex portions has, for example, a triangular prism shape having two inclined surfaces that are in contact with the apex angle, and these inclined surfaces are arranged to be diagonally opposed to the surface including the film 22 on the light emission side. ing. In addition, the shape of each convex part is not limited to the triangular prism shape, and may be, for example, a polygonal prism shape such as a pentagonal prism shape, or in a direction orthogonal to the extending direction of each convex part. Further, it may have a curved surface shape (for example, a cylindrical shape) such as an elliptical shape and an aspherical shape. Thereby, each convex part refracts and transmits the component in the arrangement direction of each convex part in the light incident from the back side of the film 22 on the light exit side toward the direction intersecting the stacking direction of the laminate 10. Increases sex.

  The convex portion may further have a polarization separation function in the whole or a part of the light emission region 22C. For example, as illustrated in FIG. 10, a polarization separation portion 24 in which a plurality of convex portions 24 </ b> A having a polarization separation function are arranged in parallel may be provided on the entire light emission region 22 </ b> C of the packaging film 20.

  For example, the laminated body 10 can be provided in the packaging film 20, and the optical function unit can be provided in the packaging film 20. For example, as shown in FIG. 11, in the packaging film 20, a laminated body 10 in which the diffusion plate 11, the diffusion sheet 12, the prism sheet 14, and the polarization separation sheet 14 are sequentially laminated from the light incident region 21 </ b> C side is provided. Furthermore, it is possible to provide a light source image adjusting unit 23 as an optical function unit in the light incident region 21C.

(Modification 4)
Further, for example, a three-dimensional shape can be provided on the light emission side surface of the diffusion plate 11. For example, in the optical package 1 shown in FIG. 7, a plurality of convex portions having the same three-dimensional shape as the convex portions 15 </ b> A of the light source image adjusting sheet 15 can be provided on the light emission side surface of the diffusion plate 11. is there. In such a case, the diffusion plate 11 has the function of a normal diffusion plate and the function of condensing the diffused light at the same time, so the light source image adjustment sheet 15 provided on the light incident side is omitted. can do.

(Modification 5)
Moreover, in the said embodiment and the said modification, the case where the packaging film 20 was comprised by two films of the light incident side film 21 and the light emission side film 22 was illustrated, For example, FIG. As shown in FIG. 12, it may be composed of a single film. FIG. 12 is a perspective view of the optical package 1 according to this modification. Moreover, the upper surface structure of the optical package 1 of FIG. 12 is shown in FIG. 13 (A), the lower surface structure of the optical package 1 of FIG. 12 is shown in FIG. 13 (B), and the AA arrow of FIG. FIG. 14 shows a cross-sectional configuration in the viewing direction.

  In the packaging film 20 according to this modification, a part on the upper surface 11A side of the packaging film 20 and a part on the lower surface 11B side of the packaging film 20 are joined to a part of a region facing the one side surface 11C-1. The joined portions 21A and 22A are provided. In addition, at least one of the joint portions 21A and 22A is a contraction portion (21B and 22B). Also,

  Moreover, the packaging film 20 which concerns on this modification has opening 20A in the adjacent part with shrinkage | contraction part 21B, 22B among the opposing areas with one side surface 11C-2. The opening 20A has, for example, a strip shape extending in the longitudinal direction of the side surface 11C-2 from the vicinity of the longitudinal end portions of the contracting portions 21B and 22B. In FIG. 12 and FIG. 13, the opening 20A is formed from the end of one contraction part 21B, 22B to the end of the other contraction part 21B, 22B. Although the case where it exposes is illustrated, for example, although not shown in the figure, the opening 20A is located at two locations near the end of one contraction portion 21B, 22B and near the end of the other contraction portion 21B, 22B. It is formed separately, and the central portion in the longitudinal direction of the side surface 11C-2 may be covered with the packaging film 20.

[Application example]
Next, an application example of the optical package 1 according to each of the above embodiments will be described. In the following, the case where the optical package 1 shown in FIG. 7 is applied to a display device will be described, but it is of course possible to use the optical package 1 shown in other drawings for a display device.

  FIG. 15 illustrates a cross-sectional configuration of a display device according to this application example. This display device includes a display panel 2, a light source 3 disposed behind the display panel 2, a reflection sheet 4 disposed behind the light source 3, and an optical disposed between the display panel 2 and the light source 3. The package 1 is provided, and the surface of the display panel 2 is directed toward the observer (not shown).

  Although not shown, the display panel 2 has a laminated structure having a liquid crystal layer between a transparent substrate on the observation side and a transparent substrate on the light source 3 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 observation 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 3 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 3 side. The color filter is configured by arranging color filters for separating the emitted light from the light source 3 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 3 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 3 is, for example, a plurality of linear light sources arranged in parallel at equal intervals (for example, 20 μm intervals). The linear light source is typically a cold cathode fluorescent lamp called a cold cathode fluorescent lamp (CCFL), but a point light source such as a light emitting diode (LED) is linearly arranged. It may be what you did. Each linear light source is, for example, in a plane parallel to the lower surface of the optical package 1, for example, a direction parallel to the extending direction of the convex portions 15 </ b> A of the light source image adjustment sheet 15 (a direction orthogonal to the normal direction of the laminate 10). It is arranged to extend.

  Next, the operation of the display device according to this application example will be described. When non-polarized light is irradiated from the light source 3 toward the optical package 1, the light from the light source 3 adjusts the luminance unevenness between the light source images by the light source image adjusting sheet 15, and the light source image obtained by the adjustment is a diffusion plate. 11 and the diffusion sheet 12. As a result, the in-plane luminance distribution becomes uniform. Thereafter, the front luminance is increased by the light condensing action of the lens film 13, and then the light condensed by the lens film 13 is polarized and separated by the reflective polarizing sheet 14 and the viewing angle is widened. Is injected into. In this way, the light from the light source is adjusted to light having a desired front luminance, in-plane luminance distribution, viewing angle, and the like, and then modulated by the display panel 2 to be viewed from the surface of the display panel 2 as image light. Injected to the side.

  In this application example, since the thin optical package 1 without wrinkles, deflection, or warpage can be used, the entire display device can be reduced in thickness without degrading display quality.

  In the application example described above, one or more optical sheets can be provided between the display panel 2 and the optical package 1. For example, as shown in FIG. 16, the reflective deflection sheet 14 may be extracted from the optical package 1 and provided between the display panel 2 and the optical package 1.

  The present invention has been described with reference to the embodiment, the modification, and the example. However, the present invention is not limited to the embodiment and the like, and various modifications can be made.

  For example, in the above embodiment and the like, the diffusion plate 11 is used as the support, but a light guide plate can also be used. However, in such a case, light from the light source is introduced from the side surface of the optical package 1, so that the light incident area 21 </ b> C of the optical package 1 is the side surface of the optical package 1.

  Further, in the above-described embodiment and the like, for the optical sheet such as the diffusing plate 11, the diffusing sheet 12, the lens film 13, the reflective polarizing sheet 14, the light source image adjusting sheet 15, the light incident side film 21, or the light emitting side film 22. Thus, a light excitation light emitting function may be imparted. In such a case, a light source such as an LED that emits short-wavelength light such as blue or ultraviolet light is used to irradiate the optical sheet with a light-excited light emission function with short-wavelength light such as blue or ultraviolet light. Thus, light having a wavelength longer than that of blue or ultraviolet can be excited and emitted, and white light can be output from the lighting device. Therefore, for example, even when the distance between the light source and the optical sheet is made narrower than the case where an LED that emits light of three colors is used as a light source, it is possible to obtain white light with no color unevenness. is there.

  In the application example, the light source image adjustment sheet 15 may be provided between the optical package 1 and the light source 3. In such a case, the luminance unevenness between the light source images can be adjusted by the light source image adjusting sheet 15 disposed outside the optical package 1. Further, when the light source image adjustment sheet 15 is provided between the optical package 1 and the light source 3, for example, as shown in FIG. 17, the light source image adjustment sheet in the optical package 1 is provided as necessary. 1 may be eliminated.

It is a perspective view showing an example of the perspective structure of the optical package which concerns on one embodiment of this invention. FIG. 2 is a perspective view illustrating an example of a perspective configuration of a diffusion plate in FIG. 1. It is a top view showing an example of the composition of the upper surface and the lower surface of the optical package of FIG. It is sectional drawing of the AA arrow direction of the optical packaged body of FIG. It is a schematic diagram showing an example of the manufacturing method 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 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 6th modification of the optical packaged body of FIG. It is a perspective view showing an example of the perspective structure of the 7th modification of the optical packaged body of FIG. It is a top view showing an example of the composition of the upper surface and the lower surface of the optical package of FIG. It is sectional drawing of the AA arrow direction of the optical packaged body of FIG. It is sectional drawing of the display apparatus concerning one application example. FIG. 16 is a cross-sectional view of a modification of the application example of FIG. 15. It is sectional drawing of the other modification of the application example of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Optical packaging body, 2 ... Display panel, 2A ... Display area, 3 ... Light source, 4 ... Reflection sheet, 10 ... Laminated body, 11 ... Diffusion plate, 11A ... Upper surface, 11B ... Lower surface, 11C, 11C-1, 11C -2 ... Side, 11D, 11E ... End, 12 ... Diffusion sheet, 13 ... Lens film, 13A, 15A, 23A, 24A ... Convex part, 14 ... Reflective polarizing sheet, 15 ... Light source image adjustment sheet, 20 ... Packaging Film, 20A ... opening, 21 ... light incident side film, 21A, 22A ... junction, 21B, 22B ... contraction part, 21C ... light incident area, 22 ... light emission side film, 22C ... light emission area, 23 ... light source Image adjusting unit, 24... Polarization separating unit, 30.

Claims (14)

A support having an upper surface, a lower surface and side surfaces;
A packaging film covering the support,
The packaging film has a contraction portion containing a heat-shrinkable material in a region facing the side surface, and has an opening in a portion adjacent to the contraction portion in the region facing the side surface. An optical package that is in close contact with the support by tension. The side surfaces include a pair of first side surfaces extending in one direction, and a second side surface extending in a direction intersecting the one direction and in contact with an end portion of the first side surface,
The contraction portion is a band-shaped region extending from the vicinity of one end portion in the longitudinal direction of the first side surface to the vicinity of the other end portion in a region facing at least one of the pair of first side surfaces. Formed,
The optical package according to claim 1, wherein the opening has a belt-like shape extending in the longitudinal direction of the second side surface from the vicinity of the end of the contraction portion. The packaging film is composed of an upper film disposed on the upper surface side and a lower film disposed on the lower surface side,
The upper film has a first bonding portion bonded to the lower film in a part of a region facing the side surface,
The lower film has a second joint portion joined to the first joint portion,
The optical packaged body according to claim 1, wherein at least one of the first bonding portion and the second bonding portion is the contraction portion. The packaging film consists of a single film,
The film has a bonding portion in which the upper surface side portion of the film and the lower surface side portion of the film are bonded to each other in a region facing the side surface,
The optical packaged body according to claim 1, wherein at least one of the upper surface side portion and the lower surface side portion of the joint portion is the contraction portion.   2. One or more optical sheets are provided between at least one of the packaging film between the upper surface portion and the support and at least one of the packaging film between the lower surface portion and the support. The optical packaged body according to 1.   The optical packaging body according to claim 5, wherein the one or more optical sheets have at least one of a diffusion function, a condensing function, a polarization separation function, a light source image adjustment function, and a light excitation light emission function.   The optical package according to claim 1, wherein the support is a diffusion plate or a light guide plate. The support is a diffusion plate;
The optical package according to claim 1, wherein a three-dimensional shape is formed on a light incident surface or a light emission surface of the diffusion plate.   The packaging film is applied to at least one of a first region where light from a light source is incident and a second region where light from the light source is emitted through the optical packaging body with respect to the light from the light source. The optical packaging body according to claim 1, which has an optical function part that acts.   The optical package according to claim 9, wherein the optical function unit has at least one of a diffusion function, a condensing function, a polarization separation function, a light source image adjustment function, and a light excitation light emission function. An optical package;
A light source that emits light toward the optical package,
The optical package is
A support having an upper surface, a lower surface and side surfaces;
A packaging film covering the support,
The packaging film has a contraction portion containing a heat-shrinkable material in a region facing the side surface, and has an opening in a portion adjacent to the contraction portion in the region facing the side surface. A lighting device in close contact with the support by tension.   The illuminating device according to claim 11, wherein a light source image adjustment sheet and a reflection sheet are provided on a rear surface of the light source in order from the light source side. 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 support having an upper surface, a lower surface and side surfaces;
A packaging film covering the support,
The packaging film has a contraction portion containing a heat-shrinkable material in a region facing the side surface, and has an opening in a portion adjacent to the contraction portion in the region facing the side surface. A display device in close contact with the support by tension.   The display device according to claim 13, wherein a light source image adjustment sheet and a reflection sheet are provided on a rear surface of the light source in order from the light source side.

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