JP2010044952A - Optical packing body, lighting device, and display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical packing body capable of lessening reduction of a yield caused by a position gap of an optical sheet while attaining prevention of wrinkles, bending, and a warp, thinning and weight reduction of the optical packing body, to provide a lighting device, and to provide a display device. <P>SOLUTION: A packing film 20 covers the whole or a part of respective surfaces of a laminated body 10 such as an upper surface, a lower surface, and side surfaces, and is firmly stuck on the laminated body 10 while tension is applied in-face direction of the film. The packing film 20 is made of a light-incident side film 21 including three sheets of films 22a, 22b, 22c and a single-layered light emitting side film 22, and the films 22a, 22b, and 22c and the light emitting side film 22 are connected at a common location (connection section 20A). Diffusion sections 23, 24, 26 are formed at a range out of the films 22a, 22b, 22c opposed to an upper surface 11A of a diffusion plate 11, and a light source image adjustment section 25 is formed at a range out of the light emitting side film 22 opposed to a lower surface 11B of the diffusion plate 11. <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 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.

  Therefore, instead of using a transparent adhesive, it is conceivable to wrap the diffusion plate and all the optical sheets with a transparent packaging film. However, there is a limit to reducing the thickness of the encapsulated optical sheet simply by creating an optical package by simply wrapping the diffuser plate and all the optical sheets with a transparent packaging film. A reduction in weight was desired. Further, in the manufacturing process, when wrapping the diffusion plate and all the optical sheets with the packaging film, the optical sheet is not fixed. Therefore, as the number of optical sheets included in the packaging film increases, the optical sheet tends to shift. Thus, there was a problem that the yield was lowered.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide an optical device capable of reducing a decrease in yield due to a positional shift of an optical sheet while reducing the thickness and weight of an optical package. An object of the present invention is to provide a package and an illumination device and a display device including the package.

  The optical package of the present invention comprises a support having an upper surface, a lower surface and side surfaces, and a packaging film. The packaging film is formed by joining the upper film disposed on the upper surface side of the support and the lower film disposed on the lower surface side of the support at predetermined locations, It is in close contact with the support in a state where all or a part of each side surface is covered. At least one of the upper film and the lower film is formed by overlapping a plurality of films. At least one region of the packaging film facing the upper surface of the support and the facing region of the packaging film facing the lower surface of the support has an optical function part that acts on the light from the light source. .

  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, the packaging film is in close contact with the support body in a state of covering all or part of each of the upper surface, the lower surface, and the side surface of the support body. The upper film arrange | positioned at the upper surface side of a support body, and the lower film arrange | positioned at the lower surface side of a support body among packaging films are joined by the predetermined | prescribed location. Thus, even when at least one of the upper film and the lower film is constituted by a plurality of films, an optical package is manufactured when the support is wrapped with the upper film and the lower film in the manufacturing process. The position of the film can be defined by the positioning accuracy of the machine. As a result, it is possible to eliminate the possibility that the film is displaced. In addition, an optical function unit that acts on light from the light source is provided in at least one region of the packaging film facing the upper surface of the support and the facing region of the packaging film facing the lower surface of the support. It has been. Thereby, for example, the function of at least one optical sheet among a plurality of optical sheets that need to be provided in the packaging film can be imparted to the packaging film, and the optical sheet can be omitted. Accordingly, in such a case, the number of optical sheets contained in the packaging film is reduced, so that the optical sheet is reduced in thickness and weight, and the frequency with which the optical sheet is displaced is reduced by the reduced number. be able to.

  According to the optical packaging body, the illumination device, and the display device of the present invention, the upper film and the lower film are joined at a predetermined location, and the region of the packaging film that faces the upper surface of the support and the support of the packaging film are supported. Since the optical function unit that acts on the light from the light source is provided in at least one of the regions facing the lower surface of the body, the optical sheet can be reduced in thickness and weight while reducing the thickness of the optical package. It is possible to reduce a decrease in yield due to the positional deviation.

  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. 2 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 FIG. 2, the optical package 1 includes a laminate 10 and a packaging film 20.

  The laminated body 10 is configured by, for example, laminating a light source image adjusting sheet 13 (optical sheet), a diffusion plate 11 (support), and a diffusion sheet 12 (optical sheet) in this order. The diffusion sheet 12 is provided on the film 22 side.

  Although not shown, the laminated body 10 has, for example, an optical sheet having at least one of a condensing function, a polarization separation function, a light source image adjustment function, and a light excitation light emitting function, instead of the diffusion sheet 12. In addition to the diffusion sheet 12, for example, an optical sheet having at least one of a condensing function, a polarization separation function, a light source image adjustment function, and a light excitation light emission function may be included.

  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. The diffusion 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 FIG. 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 (registered trademark)). 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.

  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 as will be described later. 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.

  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 illustrated in FIG. 2, the light source image adjustment sheet 13 includes a plurality of linear or cone-shaped convex portions 13 </ b> A in a light incident region 21 </ b> A (described below) (described below). When the light source arranged immediately below the laminated body 10 is a plurality of linear light sources extending in one direction orthogonal to the laminating direction of the laminated body 10 (for example, the longitudinal direction of the diffusion plate 11, that is, the depth direction in the drawing). As shown in FIG. 2, the plurality of convex portions 13 </ b> A has a linear shape (columnar shape) extending in a predetermined direction orthogonal to the stacking direction of the stacked body 10, and the extension It is preferable that they are arranged side by side in a direction crossing the direction. At this time, the extending direction of each convex portion 13A 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 13A may have a polygonal column shape, or the surface of the convex portion 13A may be a curved surface. Further, a light source image adjusting sheet in which a plurality of convex portions extending in a direction orthogonal or substantially orthogonal to the extending direction of the convex portion 13A is arranged in parallel between the diffusion plate 11 and the light source image adjusting sheet 13 is separately provided. It can also be provided. 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 13A. Although not shown, it is preferably in the shape of a cone and is continuously two-dimensionally arranged in the light incident region 21A.

  Thereby, for example, the light source image adjusting sheet 13 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 the 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.

  The packaging film 20 covers all or only part of the upper surface 11A, the lower surface 11B, and the side surface 11C of the diffusion plate 11, and adjusts the diffusion plate 11, the diffusion sheet 12, and the light source image in a state where tension is applied in the in-plane direction. It is in close contact with the sheet 13. As shown in FIG. 2, the packaging film 20 has a light incident side film 21 (lower film) on the lower surface 11B side of the diffusion plate 11, and a light emission side film 22 (on the upper surface 11A side of the diffusion plate 11). Upper film). The light incident side film 21 and the light emitting side film 22 are joined together by an annular joining portion 20A formed in the outer peripheral region of the diffusion plate 11 when viewed from the normal direction of the diffusion plate 11, and the diffusion plate The diffusion plate 11 is held from the normal direction of 11 and the direction intersecting the normal direction of the diffusion plate 11. The joining portion 20A is formed outside the light incident region 21A and the light emitting region 22A, and is located in a region facing the side surface 11C of the diffusion plate 11 or in the vicinity thereof.

  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, whether or not a shrinkage force (tension) is applied to the light incident side film 21 and the light emission side film 22 by using TMA (thermal / stress / strain measuring apparatus EXSTAR6000 TMA / SS) manufactured by Seiko. It is possible to confirm or measure the magnitude of contraction force (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.

  By the way, at least one of the light incident side film 21 and the light emitting side film 22 is formed by overlapping a plurality of films. For example, as shown in FIG. 2, the light incident side film 21 is a single layer, and the light emitting side film 22 is a laminated structure in which two films 22a and 22b are stacked in this order from the diffusion plate 11 side. It has become. Both ends of the films 22a and 22b are joined together at the end of the packaging film 20 together with the light incident side film 21 by the joining portion 20A. That is, the light incident side film 21 and the light emission side film 22 are joined at a common location (joining portion 20A).

  In addition, the packaging film 20 includes a light incident area 21A (an area facing the lower surface 11B of the diffusion plate 11) in which light from the light source is incident when a light source (not shown) is disposed immediately below the laminate 10, and a light source Optical function unit that acts on the light from the light source in at least one region of the light emission region 22A (a region facing the upper surface 11A of the diffusion plate 11) where the light from the light passes through the optical package 1 and is emitted. have. This optical function part is formed in the whole area | region corresponding to the display area of a display panel, when the display panel (not shown) is arrange | positioned directly on the packaging film 20, and the outer surface of the packaging film 20, It is formed in at least one place on the inner surface and inside. The optical function unit has, for example, at least one function 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. 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 shown in FIG. 2, the film 22 a on the light emission side has a diffusion part 23 as an optical function part in the light emission region 22 </ b> A. Further, for example, as shown in FIG. 2, the light emission side film 22 b has a diffusion portion 24 as an optical function portion in the light emission region 22 </ b> A. These diffusing parts 23 and 24 contain, 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 parts 23 and 24 may contain fine particles having the same diameter, or fine particles having a plurality of types of diameters.

  In addition, instead of the optical sheet (for example, the diffusion sheet 12, the light source image adjustment sheet 13, the prism sheet, the polarization separation sheet, etc.) that can be included in the laminate 10, a film having the same function as that of the optical sheet is packaged. The film 20 may be used as a light incident side film or a light emission side film.

  For example, as shown in FIG. 3, instead of the light source image adjustment sheet 13, a light source image adjustment unit 25 having the same function as the light source image adjustment sheet 13 is provided in the light incident area 21 </ b> A of the light incident side film 21. It can be provided as a part. The light source image adjusting unit 25 has a plurality of linear or cone-shaped convex portions 25A 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 21A. ing. FIG. 3 illustrates a case where the convex portion 25A is provided on the surface of the light incident region 21A on the diffusion plate 11 side. FIG. 3 illustrates the case where the convex portion 25 </ b> A is formed integrally with the light incident side film 21, but is formed separately from the light incident side film 21 on the light incident side film 21. It may be. Moreover, it is preferable that the refractive index is large about the formation part (especially convex part 25A) of the light source image adjustment part 25 among the packaging films 20, for example, it is preferable that it is 1.55 or more.

  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. 3, the plurality of convex portions 25 </ 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, it is preferable that the extending direction of each convex portion 25A is 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 25A may have a polygonal prism shape, or the surface of the convex portion 25A may be a curved surface. Further, a light source image adjusting sheet in which a plurality of convex portions extending in a direction orthogonal or substantially orthogonal to the extending direction of the convex portion 13A is arranged in parallel between the diffusion plate 11 and the light source image adjusting sheet 13 is separately provided. It can also be provided. 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, 25A 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 21A. It is preferable.

As a result, the light source image adjustment unit 25 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.

  Furthermore, for example, as shown in FIG. 4, instead of the diffusion sheet 12, another film 22C is provided on the light emission side of the packaging film 20, and the diffusion sheet 12 is provided in the light emission region 22A of the film 22C. It is possible to provide the diffusion part 26 having the same function as the optical function part. The diffusion unit 26 contains, for example, the same light diffusion material (fine particles) as the diffusion units 23 and 24.

  Further, for example, as shown in FIG. 5, a light incident side film 27 is further provided on the light incident side of the packaging film 20, and the light incident area 21 </ b> A of the light incident side film 27 is the same as the light source image adjusting unit 25. It is possible to provide the light source image adjustment unit 28 having a function as an optical function unit. In the following, when mentioning that the light incident side film of the packaging film 20 has a laminated structure, the laminate composed of the light incident side film 27 and the light incident side film 21 is simply light incident. It shall be called the side film 21.

  The light source image adjusting unit 28 has a plurality of linear or pyramidal convex portions 28A 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 21A. ing. FIG. 5 illustrates the case where the convex portion 28A is provided on the surface of the light incident region 21A on the diffusion plate 11 side. FIG. 5 illustrates a case where the convex portions 28A are arranged in parallel in the depth direction of the drawing. FIG. 5 illustrates the case where the convex portion 28 </ b> A is formed integrally with the light incident side film 27, but is formed separately from the light incident side film 27 on the light incident side film 27. It may be.

  Here, the light source arranged immediately below the diffusion plate 11 is a plurality of point light sources arranged in one plane having a normal line parallel to the normal direction of the diffusion plate 11, and a plurality of convex portions 25A. However, when the extending direction of each convex portion 25A has a linear shape (columnar shape) extending in one extending direction of the plurality of point light sources, the plurality of convex portions 28A are shown in FIG. As shown, it has a linear shape (columnar shape) extending in a direction orthogonal to the extending direction of the convex portion 25A, and is continuously arranged in a direction intersecting with the extending direction. Preferably it is. At this time, it is preferable that the extending direction of each convex portion 28A is parallel to the extending direction of the plurality of point light sources, but an allowable range in terms of optical characteristics with respect to the extending direction of the plurality of point light sources. You may arrange | position so that it may cross | intersect. The convex portion 28A may have a polygonal prism shape, or the surface of the convex portion 28A may be a curved surface. In addition, 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), The plurality of convex portions 28A preferably have a linear shape (columnar shape) extending in a direction orthogonal to the extending direction of the convex portions 28A.

  As a result, the light source image adjusting unit 28 refracts and transmits light incident on the lower surface or the upper surface of the light transmitted through the light source image adjusting unit 25 at an angle less than the critical angle, while entering at an angle greater than the critical angle. Since the reflected light is totally reflected, the light source image formed by the light source image adjusting unit 25 corresponds to the number of surfaces constituting the surface shape of each convex portion 28A (strictly, the number of surfaces classified for each inclination angle). It has a function to remove (or erase) it. Thereby, the difference in the luminance level in the plane can be made smaller than the difference in the luminance level in the plane before the division, and the unevenness of the illumination luminance can be reduced. Therefore, it can be said that the light source image adjusting unit 28 also has a diffusion function.

  It is also possible to provide an opening in the packaging film 20 so that the inside and the outside of the packaging film 20 communicate with each other. For example, as illustrated in FIGS. 6, 7, and 8, one or a plurality of openings 20 </ b> B may be provided in a region of the packaging film 20 that faces the side surface 11 </ b> C of the diffusion plate 11. FIG. 6 illustrates a case where openings 20 </ b> B are provided at locations corresponding to the four corners of the diffusion plate 11. FIG. 7 illustrates a case where the opening 20 </ b> B is provided at a location corresponding to the central portion of each side of the diffusion plate 11. Moreover, FIG. 8 illustrates a case where the opening 20B is provided at a location corresponding to a pair of opposite sides of the diffusing 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. As described above, by providing the opening 20B in the packaging film 20, the air accumulated in the packaging film 20 is extracted from the opening 20B when the laminate 10 (or the diffusion plate 11) is wrapped with the packaging film 20 in the manufacturing process. In addition, after production, the gas generated in the packaging film 20 can be extracted from the opening 20B. Further, as shown in FIG. 6, when the openings 20 </ b> B are provided corresponding to the four corners of the diffusion plate 11, it is possible to prevent the packaging film 20 from being broken by the sharp ends of the four corners of the diffusion plate 11. It becomes.

  Next, with reference to FIG. 9, an example of the manufacturing method of the optical package 1 of this Embodiment is demonstrated. FIG. 9 shows an example of a method for manufacturing the optical package 1 having the configuration shown in FIG.

  First, the light emission side films 22a, 22b, and 22c and the light incident side films 21 and 27 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-incidence side films 27 and 21 are sent out simultaneously or separately from a roll, and the diffuser plate 11 prepared separately is predetermined on the light-incidence side films 21 and 27. Place in position.

  Next, using the machine (not shown) which sends out a film, light emission side film 22a, 22b, 22c is sent out simultaneously or separately from a roll, and it is mounted so that the upper surface of the said diffusion plate 11 may be covered. Here, it is desirable that the widths of the light emission side films 22a, 22b, and 22c and the light incident side films 21 and 27 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 22a, 22b, and 22c and the light incident side films 27 and 21, using the welding cutter 40 (see FIG. 9), the films 22a, 22b, and 22c and the light incident side are used. The films 27 and 21 are welded (joined) at a common location and cut. As a result, the joining portion 20A is formed at the ends of the films 22a, 22b, 22c and the light incident side films 27, 21.

  Next, the cut films 22a, 22b, 22c and the light incident-side films 27, 21 are heated or irradiated with energy rays, thereby cutting the films 22a, 22b, 22c and the light incident. The side films 27 and 21 are shrunk, and the diffusion plate 11 is covered with the packaging film 20 in a state where a shrinking force is applied. 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 source image adjustment unit 25, 28 side of the optical package 1 and non-polarized light is emitted from the light source toward the optical package 1, the light from the light source is converted into a light source image by the light source image adjustment unit 25. The luminance unevenness is adjusted, and the light source image obtained by the adjustment is blurred (erased) by the light source image adjusting unit 28 and diffused by the diffusion plate 11. Thereby, the in-plane luminance distribution is made uniform. Thereafter, the light is diffused by the diffusion portions 26, 24, and 23 of the light emission side films 22a, 22b, and 22c, and the in-plane luminance distribution is further uniformized, and then 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, the light incident side film 21 arrange | positioned at the lower surface 11B side of the diffuser plate 11, and the light emission side film 22 arrange | positioned at the upper surface 11A side of the diffuser plate 11 are common places (joining part). 20A). Thus, even if at least one of the light incident side film 21 and the light emitting side film 22 is constituted by a plurality of films, the diffusion plate 11 is replaced with the light incident side film 21 and the light emitting side film in the manufacturing process. When wrapping with 22, the positional relationship of the film can be defined by the positioning accuracy of the machine that manufactures the optical package 1. As a result, there is no possibility that each film is shifted. Further, at least one of the facing region (light emission region 22A) of the wrapping film 20 with the upper surface 11A of the diffusion plate 11 and the facing region (light incident region 21A) of the wrapping film 20 with the lower surface 11B of the diffusion plate 11 is used. In the region, an optical function unit that acts on light from the light source is provided. 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. As described above, in the present embodiment, there is no possibility that each film is shifted, and the frequency of shifting the optical sheet can be reduced by reducing the number of optical sheets included in the packaging film 20, so that the film or optical It is possible to reduce the sheet from shifting and the yield from decreasing.

  Moreover, in this Embodiment, the laminated body 10 (or diffuser plate 11) is covered with 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. As a result, when the light source image adjustment units 25 and 28 are provided in the light incident region 21A of the packaging film 20 or the diffusion units 23, 24, and 26 are provided in the light emission region 22A, the thickness of each film is several. Even if it is as thin as about 10 μm, there is no possibility that the light source image adjusting units 25 and 28 and the diffusing units 23, 24, and 26 are wrinkled, bent, and warped, so the light source image adjusting units 25 and 28 and the diffusing units 23 and 24 , 26 can be used as a substitute for an optical sheet having the same function as those described above, and the optical package 1 as a whole as compared with the case where an optical sheet having the same function as these is provided in the packaging film 20. The thickness of the optical package 1 can be reduced. As described above, in the present embodiment, not only can the yield decrease due to the displacement of the film and the optical sheet be reduced, but also bend and warp can be prevented, and the optical package can be made thinner and lighter. Can be realized.

  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 embodiment, when each optical sheet is replaced with a light incident side film or a light emission 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 the thinning is hindered or the luminance loss occurs. Moreover, since the optical packaging body 1 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).

[Second Embodiment]
Next, a second embodiment of the present invention will be described.

  FIG. 10 (A) represents an example of the top surface configuration of the optical package 2 according to the second embodiment of the present invention. FIG. 10B illustrates an example of a lower surface configuration of the optical package 2 in FIG. FIG. 11 illustrates an example of a cross-sectional configuration of the optical package 2 in FIG. The optical package 2 includes, for example, an edge light including a display panel that is driven based on an image signal, a light guide plate disposed immediately below the display panel, and a light source disposed at an end of the light guide plate. It is used suitably for a type of lighting device.

  The optical packaging body 2 of the present embodiment includes the laminate 10 and the packaging film 20 as in the optical packaging body 1 of the above embodiment.

  The laminated body 10 according to the present embodiment is configured by, for example, laminating a reflection sheet 15 (optical sheet), a light guide plate 14 (support), and a diffusion sheet 12 (optical sheet) in this order. The diffusion sheet 12 is provided on the side film 22 side. Although not shown, the laminate 10 has a light collecting sheet or a polarization separating sheet instead of the diffusion sheet 12, or on the diffusion sheet 12 (on the side opposite to the light guide plate 11 with respect to the diffusion sheet 12). You may have a condensing sheet and a polarization separation sheet.

  The packaging film 20 of the present embodiment covers all or only a part of the upper surface 14A, the lower surface 14B, and the side surface 14C of the light guide plate 14, and the light guide plate 14 and the diffusion sheet in a state where tension is applied in the in-plane direction. 12 and the reflection sheet 15. As shown in FIG. 11, the packaging film 20 has a light incident side film 21 (lower film) on the lower surface 14B side of the light guide plate 14, and a light emission side film 22 (on the upper surface 14A side of the light guide plate 14). Upper film). The light incident side film 21 and the light emitting side film 22 are collectively bonded by an annular bonding portion 20A formed in the outer peripheral region of the light guide plate 14 when viewed from the normal direction of the light guide plate 14. The light guide plate 14 is held from the normal direction of 14 and the direction intersecting the normal direction of the light guide plate 14. The joining portion 20A is formed outside the light incident region 21A and the light emitting region 22A, and is formed so as to be biased toward the upper surface 14A side of the light guide plate 14 in the region facing the side surface 14C of the light guide plate 14 and the vicinity thereof. Yes. Therefore, most of the side surface 14 </ b> C of the light guide plate 14 is in contact with the light emission side film 22.

  By the way, at least one of the light incident side film 21 and the light emitting side film 22 of the present embodiment is formed by overlapping a plurality of films. For example, as shown in FIG. 11, the light incident side film 21 is a single layer, and the light emission side film 22 is a laminated structure in which two films 22a and 22b are stacked in this order from the light guide plate 14 side. It has become. Both ends of the films 22a and 22b are joined together at the end of the packaging film 20 together with the light incident side film 21 by the joining portion 20A. That is, the light incident side film 21 and the light emission side film 22 are joined at a common location (joining portion 20A).

  The packaging film 20 has a region (light incident region 21A) facing the light source in the light incident side film 21 when a light source (not shown) is arranged on the side surface (side surface 14C of the light guide plate 14) of the laminate 10. ) And an area where light from the light source is emitted through the laminate 10 (light emission area 22A) has an optical function unit that acts on the light from the light source. is doing. This optical function part is formed in the whole area | region corresponding to the display area of a display panel, when the display panel (not shown) is arrange | positioned directly on the packaging film 20, and the outer surface of the packaging film 20, It is formed in at least one place on the inner surface and inside. The optical function unit has, for example, at least one function 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. 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 shown in FIG. 11, the film 22 a on the light emission side includes a diffusion portion 23 as an optical function portion in the light emission region 22 </ b> A. Further, for example, as illustrated in FIG. 11, the light emission side film 22 b includes a diffusion portion 24 as an optical function portion in the light emission region 22 </ b> A. These diffusing sections 23 and 24 contain the same light diffusing material (fine particles) as mentioned in the first embodiment.

  In addition, instead of the optical sheet (for example, the diffusion sheet 12 and the reflection sheet 15) included in the laminated body 10, a film having the same function as the function of the optical sheet is used as the film on the light incident side of the packaging film 20 or the light emission. It may be used as a side film.

  For example, as shown in FIG. 12, instead of the diffusion sheet 12, another film 23C is provided on the light emission side of the packaging film 20, and the light emission region 22A of the film 23C is similar to the diffusion sheet 12. It is possible to provide a diffusing portion 26 having the above functions. The diffusion unit 26 contains, for example, the same light diffusion material (fine particles) as the diffusion units 23 and 24.

  Further, for example, as shown in FIG. 13, instead of the reflection sheet 15, a reflection portion 29 having the same function as that of the reflection sheet 15 is provided in a region facing the lower surface 14 </ b> B of the light guide plate 14 in the light incident side film 21 </ b> A. Can be provided as an optical function unit. Furthermore, for example, as shown in FIG. 14, not only the region facing the lower surface 14 </ b> B of the light guide plate 14 in the light incident side film 21 </ b> A but also the joint 20 </ b> A, that is, from the light source in the light incident side film 21. It is possible to provide a reflection part 29 having the same function as that of the reflection sheet 15 as an optical function part in an area excluding the light incident area 21A where the light directly enters.

  It is also possible to provide an opening in the packaging film 20 so that the inside and the outside of the packaging film 20 communicate with each other. For example, as shown in FIGS. 15, 16, and 17, one or a plurality of openings 20 </ b> B may be provided in a region of the packaging film 20 facing the side surface 14 </ b> C of the light guide plate 14. FIG. 15 illustrates a case where openings 20 </ b> B are provided at locations corresponding to the four corners of the light guide plate 14. FIG. 16 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 14. Moreover, FIG. 17 illustrates a case where the opening 20B is provided in a portion corresponding to a pair of opposite sides of the light guide plate 14 and the packaging film 20 has a belt shape. Of course, it is possible to appropriately adjust the location, size, and number of the openings 20B as necessary. Further, when an edge light type light source is used, that is, when the light source is disposed in a region facing the side surface 14C of the light guide plate 14, packaging is performed so that light from the light source can easily enter the packaging film 20. An opening 20B is provided on the entire surface of the film 20 including the region facing the light source (light incident region 21A) (see FIG. 17), or a plurality of dots or slits are formed in the region of the packaging film 20 facing the light source. The openings 20B may be provided in a concentrated manner.

  Next, the operation of the optical package 2 having the configuration of FIG. 14 will be described. When a light source is disposed on the light incident side film 21 side of the optical package 2 and in a region facing the side surface 14C of the light guide plate 14, and non-polarized light is irradiated from the light source toward the optical package 2, The light from the light source is directly incident on the light incident side film 21 or is reflected by the reflecting portion 29 provided in the bonding portion 20A and then passes through the light incident side film 21. The light transmitted through the light incident side film 21 is scattered by the light guide plate 14 and further reflected by the reflecting portion 29. Thereby, the in-plane luminance distribution is made uniform. Thereafter, the light transmitted through the light guide plate 14 is diffused by the diffusion portions 26, 24, and 23 of the incident side film 21, and the in-plane luminance distribution is further uniformized, and then 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, the light incident side film 21 arrange | positioned at the lower surface 14B side of the light-guide plate 14, and the light emission side film 22 arrange | positioned at the upper surface 14A side of the light-guide plate 14 are common locations (joining part). 20A). Thus, even when at least one of the light incident side film 21 and the light emitting side film 22 is constituted by a plurality of films, the light guide plate 14 is replaced with the light incident side film 21 and the light emitting side film in the manufacturing process. When wrapping with 22, the positional relationship of the film can be defined by the positioning accuracy of the machine that manufactures the optical package 2. As a result, there is no possibility that each film is shifted. Further, in the packaging film 20, a region facing the upper surface 14 </ b> A of the light guide plate 14 (light emission region 22 </ b> A) and a region of the packaging film 20 facing the lower surface 14 </ b> B of the light guide plate 14 or at least one region of the joint 20 </ b> A. Is provided with an optical function unit that acts 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. As described above, in the present embodiment, there is no possibility that each film is shifted, and the frequency of shifting the optical sheet can be reduced by reducing the number of optical sheets included in the packaging film 20, so that the film or optical It is possible to reduce the sheet from shifting and the yield from decreasing.

  Moreover, in this Embodiment, the laminated body 10 (or light guide plate 14) is covered with 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. As a result, when the reflective part 29 is provided in a part other than the light incident area 21A in the packaging film 20 or the diffusing parts 23, 24, 26 are provided in the light emitting area 22A, the thickness of each film is several tens. Even if it is as thin as about μm, there is no possibility that the light source image adjusting sections 25 and 28 and the diffusing sections 23, 24, and 26 are wrinkled, bent, and warped. Can be used as a substitute for the optical sheet having the same function as that of the optical packaging body 2 as compared with the case where an optical sheet having the same function as the above is provided in the packaging film 20. The optical package 2 can be lightened. As described above, in the present embodiment, not only can the yield decrease due to the displacement of the film and the optical sheet be reduced, but also bend and warp can be prevented, and the optical package can be made thinner and lighter. Can be realized.

  Moreover, in this embodiment, when replacing each optical sheet with a light incident side film or a light emission side film of the packaging film 20 as in the above embodiment, all the films are replaced with a common location (joint portion). Since welding (bonding) is performed at 20A), an unnecessary film is not added, and there is no possibility that thinning is hindered or luminance loss occurs. Moreover, since the optical packaging body 1 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).

[Modification]
In the second embodiment, in order to make the light from the light source incident from the side surface 14C of the light guide plate 14, the joint portion 20A is connected to the side surface 14C of the light guide plate 14 and the vicinity of the light guide plate 14 in the vicinity thereof. Although it is formed to be biased toward the upper surface 14A, it may be formed in the vicinity of the center in the thickness direction of the region facing the side surface 14C of the light guide plate 14. However, in that case, the light from the light source is incident on the outer end surface of the joint portion 20A (the surface of the joint portion 20A on the side opposite to the light guide plate 14). Thus, it is important to devise a method for reducing the rate at which incident light is reflected by the end face of the joint portion 20A.

  For example, as shown in FIG. 18A (top view), FIG. 18B (bottom view), and FIG. 19 (cross-sectional view in the direction of arrows AA in FIG. 18A), the joint 20A It is preferable to provide the concavo-convex portion 31 in the region where the light from the light source is incident on the end face. The uneven portion 31 has, for example, an uneven shape that becomes zigzag when viewed from the upper surface side of the optical packaging body 2, and most of the light from the light source is incident on the surface of the uneven portion 31 with less than a critical angle. It is supposed to be.

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

  FIG. 20 illustrates a cross-sectional configuration of the display device 3 according to this application example. The display device 3 includes a display panel 4 that is driven based on an image signal, a light source 5 that is disposed behind the display panel 4 and emits light that illuminates the display panel 4, and a reflection that is disposed behind the light source 5. A sheet 6 and an optical package 1 disposed between the display panel 4 and the light source 5 are provided.

  Although not shown, the display panel 4 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 5 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 5 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 CCFL (Cold Cathode Fluorescent Lamp), but may be a hot cathode tube (HCFL). Further, the linear light source may be a linear light source in which point light sources such as light emitting diodes (LEDs) are arranged. Each linear light source is arranged, for example, in a plane parallel to the lower surface of the optical package 1, for example, extending in a direction parallel to the extending direction of the convex portion 25A of the light source image adjusting unit 25.

  Next, the operation of the display device 3 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 5 adjusts the luminance unevenness between the light source images by the light source image adjusting unit 25, and the light source image obtained by the adjustment is a diffusion plate. 11 and diffusion units 26, 24, and 23. As a result, the in-plane luminance distribution becomes uniform. Thereafter, the light emitted from the optical package 1 was adjusted to light having a desired front luminance, in-plane luminance distribution, viewing angle, and the like by a lens film or a reflective polarizing sheet arranged as necessary. After that, the light is incident on the back surface of the display panel 4. The light incident on the display panel 4 is modulated by the display panel 4 and emitted from the surface of the display panel 4 as image light.

  By the way, in this application example, since the optical package 1 is used, a display device with high display quality is provided with almost no deterioration in optical characteristics due to film and optical sheet displacement, wrinkles, sagging, and warping. be able to. Moreover, as a result of using the optical packaging body 1, the whole display apparatus 3 can be made thin, and the display apparatus 3 can be reduced in weight.

  FIG. 21 illustrates a cross-sectional configuration of the display device 7 according to this application example. The display device 7 includes a display panel 4, an optical package 2 disposed behind the display panel 4, a light source 8 disposed at an end of the optical package 2, and a reflection disposed behind the light source 8. And a plate 9.

  The light source 8 is, for example, a single linear light source. The linear light source is typically a cold cathode fluorescent lamp called a cold cathode fluorescent lamp, but may be a hot cathode fluorescent lamp (HCFL). Further, the linear light source may be a linear light source in which point light sources such as light emitting diodes are arranged. For example, the light source 8 is disposed in a region facing the side surface 14C of the light guide plate 14 so as to extend along the side surface 14C.

  Next, the operation of the display device 7 according to this application example will be described. When non-polarized light is irradiated from the light source 8 toward the optical package 2, the light from the light source 8 is directly incident on the light incident side film 21 or is reflected by the reflecting portion 29 provided at the joint portion. The light is transmitted through the light incident side film 21 and enters the light guide plate 14. The light incident on the light guide plate 14 is scattered by the light guide plate 14 and further reflected by the reflecting portion 29. Thereby, the in-plane luminance distribution is made uniform. Thereafter, the light transmitted through the light guide plate 14 is diffused by the diffusion portions 26, 24, and 23 of the incident side film 21, and the in-plane luminance distribution is further uniformized. Thereafter, the light emitted from the optical package 2 was adjusted to light having a desired front luminance, in-plane luminance distribution, viewing angle, and the like by a lens film or a reflective polarizing sheet arranged as necessary. After that, the light is incident on the back surface of the display panel 4. The light incident on the display panel 4 is modulated by the display panel 4 and emitted from the surface of the display panel 4 as image light.

  By the way, in this application example, since the optical package 2 is used, a display device with high display quality can be provided with almost no deterioration in optical characteristics due to film, optical sheet displacement, wrinkles, sagging, and warping. Can do. Moreover, as a result of using the optical package 2, the entire display device 7 can be thinned, and the display device 7 can be reduced in weight.

  In addition, as shown in FIG. 22, it is also possible to arrange | position the light source 8 to the junction part 20A edge part. In that case, it is preferable to provide the concavo-convex part 31 at the end of the joint 20A to reduce the ratio of the light from the light source 8 reflected at the end of the joint 20A.

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

  Moreover, it is also possible to arrange the light source 8 on the side surfaces of the optical packaging bodies 1 and 2 instead of arranging them directly under the optical packaging bodies 1 and 2.

  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 the above-described embodiment, the light excitation light emission is performed on the optical sheet such as the diffusion plate 11, the diffusion sheet 12, the light source image adjustment sheet 13, the light guide plate 14, the light emission side film 22, or the light incident side films 21 and 27. A function may be added. 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 FIG. 20, it is also possible to provide a light control member (typically a prism sheet) between the light source 5 and the reflection sheet 6. In this light control member, a concavo-convex structure portion having a geometric cross section is continuously formed on at least one surface. Moreover, it is desirable that the light control member is provided with a light guide function. Light can be guided between the plurality of light sources 5 by the light guide function. As a result, the number of the light sources 5 can be reduced or the distance between the light sources 5 and the optical package 1 can be reduced without revealing the lamp image. Thus, the lighting device and the display device can be thinned. The light control member can be appropriately combined with other embodiments and examples in this specification.

Here, for example, in the display device 3 of FIG. 20, each member is provided in the order of the reflection sheet 6, the light control member, the light source 5, the optical package 1, and the display panel 4. A configuration example is as follows. In addition, below, each member was described in order from the light source 5 side.
(1) Light incident side film with unevenness canceling function, diffuser plate, prism sheet, light exiting side film with diffuser function (2) Light incident side film with unevenness canceling function, diffuser plate, diffusion sheet, prism sheet, light with diffuser function Ejection side film (3) Light incident side film with unevenness eliminating function, diffusion plate, light emission side film with light splitting function (In this case, a diffusion sheet may be further provided on the light emission side film.)
(4) Light incident side film with unevenness elimination function, diffusion plate, diffusion sheet, light emission side film with light splitting function (In this case, a diffusion sheet may be further provided on the light emission side film.)

  In addition, the function equivalent to the prism sheet and diffusion sheet as described in (1), (3), (4) can also be provided to a light emission side film (packaging film) using this invention. . Moreover, you may add a reflective polarization functional sheet to the structure as described in (1)-(4). This reflective polarization functional sheet may be provided inside or outside the optical package 1 as a single sheet, or a function equivalent to that of the reflective polarization functional sheet may be imparted to the packaging film. When the reflective polarization functional sheet is provided as a single sheet, the reflective polarization functional sheet may be provided, for example, between the optical package 1 and the display panel 4. Moreover, what is necessary is just to provide the function equivalent to a reflective polarization functional sheet to a light emission side film, for example, when providing the function equivalent to a reflective polarization functional sheet to a packaging film.

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 AA arrow direction 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 process drawing for demonstrating an example of the manufacturing method of the optical packaged body of FIG. It is a top view showing an example of composition of the upper surface and the undersurface of the optical packing object concerning a 2nd embodiment of the present invention. It is sectional drawing of the AA arrow direction 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 top view showing the structure of the upper surface and lower surface of the 7th modification of the optical packaged body 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. It is sectional drawing of the display apparatus concerning another application example. It is sectional drawing of the modification of the display apparatus of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 2 ... Optical package, 3, 7 ... Display apparatus, 4 ... Display panel, 5, 8 ... Light source, 6, 15 ... Reflective sheet, 9 ... Reflector plate, 10 ... Laminated body, 11 ... Diffuser plate, 11A, 14A ... Upper surface, 11B, 14B ... Lower surface, 11C, 14C ... Side surface, 12 ... Diffusion sheet, 13 ... Light source image adjustment sheet, 13A, 25A, 28A ... Projection, 14 ... Light guide plate, 20 ... Packaging film, 20A ... Joining Part, 20B ... opening, 21, 27 ... light incident side film, 21A ... light incident area, 22 ... light emission side film, 22A ... light emission area, 22a, 22b, 22c ... film, 23, 24, 26 ... diffusion Part, 25, 28 ... light source image adjustment part, 29 ... reflection part, 31 ... uneven part, 40 ... welding cutter.

Claims (17)

A support having an upper surface, a lower surface and side surfaces;
A packaging film that adheres to the support in a state of covering all or part of each of the upper surface, the lower surface, and the side surface;
The packaging film is formed by joining the upper film disposed on the upper surface side and the lower film disposed on the lower surface side at a predetermined location,
At least one of the upper film and the lower film is formed by overlapping a plurality of films,
At least one area | region among the opposing area | region with respect to the said upper surface of the said packaging film and the said lower surface of the said packaging film is an optical package which has an optical function part which acts with respect to the light from a light source.   The optical packaging body according to claim 1, wherein the packaging film is in close contact with the support in a state where tension is applied in an in-plane direction.   2. The optical package according to claim 1, wherein a joint between the upper film and the lower film is in a region facing the side surface of the support or in the vicinity thereof.   The optical package according to claim 1, wherein the support is a diffusion plate or a light guide plate.   2. The optical package according to claim 1, wherein the optical function unit has 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.   The optical package according to claim 1, further comprising one or more optical sheets between at least one of the support and the upper film and between the support and the lower film.   The optical packaging body according to claim 6, 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.   2. The optical package according to claim 1, wherein a joint portion between the upper film and the lower film is formed on an upper surface side of the support body in a region facing the side surface of the support body and in the vicinity thereof.   The optical packaging body according to claim 8, wherein the lower film has a reflection portion as the optical function portion in a region facing the lower surface of the support.   The optical package according to claim 8, further comprising a reflective sheet between the support and the lower film.   The optical packaging body according to claim 8, wherein a joint portion between the upper film and the lower film has a reflection portion as the optical function portion. The joint between the upper film and the lower film has an end surface that faces the side surface of the support,
The optical packaged body according to claim 8, wherein at least a part of the end surface has an uneven shape.   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 has an opening in at least a part of a region facing the side surface of the support.   The optical packaging body according to claim 1, wherein the packaging film has an opening in a portion facing the light source when the light source is disposed in a region facing the side surface of the support. 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 that adheres to the support in a state of covering all or part of each of the upper surface, the lower surface, and the side surface;
The packaging film is formed by joining the upper film disposed on the upper surface side and the lower film disposed on the lower surface side at a predetermined location,
At least one of the upper film and the lower film is formed by overlapping a plurality of films,
At least one area | region among the opposing area | region with the said upper surface of the said packaging film and the said lower surface of the said packaging film has an optical function part which acts with respect to the light from a light source. 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 that adheres to the support in a state of covering all or part of each of the upper surface, the lower surface, and the side surface;
The packaging film is formed by joining the upper film disposed on the upper surface side and the lower film disposed on the lower surface side at a predetermined location,
At least one of the upper film and the lower film is formed by overlapping a plurality of films,
At least one of a region facing the top surface of the packaging film and a region facing the bottom surface of the packaging film has an optical function unit that acts on light from a light source.

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