JP2010039193A - Optical lens film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical lens film capable of suppressing the deterioration of the display quality due to presence of a non-display part of a display panel even in the case where a plurality of the display panels are combined with one another. <P>SOLUTION: The optical lens film 1 includes a base body 7 and protrusions 2 as an optical element structure. The base body 7 is a sheet-like member. The protrusions 2 are formed at least either on the main surface or the rear surface of the base body 7, and change the advancing direction of light. In the optical lens film 1, the structure of the protrusions 2 are determined such that, when the projection surface extending in a direction along the main surface of the base body 7 and positioned oppositely to the protrusions 2 is supposed, the centroid position in the projection area on the projection surface of the light transmitted and emitted through the base body 7 and the protrusions 2 deviates from the centroid position of the projection area on the projection surface of light transmitted and emitted through the base body in a state that the protrusions 2 are not formed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical lens film, and more particularly to an optical lens film capable of controlling a display position of an image displayed by a display device.

  Conventionally, display devices such as liquid crystal display devices are known. In such a display device, it has been proposed to connect a plurality of display panels to realize a large-screen display device (see, for example, JP-A-2006-47797 (hereinafter referred to as Patent Document 1)). ).

In Patent Document 1 described above, a panel unit in which a plurality of liquid crystal display panels are connected to a front plate made of a single transparent material, and the same number of backlights facing the panel unit and corresponding to each liquid crystal display panel. There has been proposed a display device including a backlight unit that is connected to each other and attached to a single back plate. In Patent Document 1, a non-display part (part provided with an adhesive seal material) formed at an end part of an adjacent liquid crystal display panel is arranged so as to overlap each other at a joining part of liquid crystal display panels. It has been proposed to reduce the width of the non-display portion at the connecting portion in the unit. In the display device, a known optical lens film such as a diffusion sheet and a lens film is installed in the panel unit for the purpose of improving display quality.
JP 2006-47797 A

  However, in the above-described display device, although there is a non-display portion in the joint portion of the liquid crystal display panel although the width is narrow, there is a limit to improving display quality.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a display resulting from the presence of a non-display portion of a display panel even when a plurality of display panels are combined. An object of the present invention is to provide an optical lens film capable of suppressing deterioration in quality.

  The optical lens film according to the present invention includes a base body and an optical element structure. The base body is a sheet-like member having a main surface and a back surface located on the opposite side of the main surface. The optical element structure is a structure that is formed on at least one of the main surface and the back surface of the base body and changes the light traveling direction. In the optical lens film described above, light is transmitted through the base body and the optical element structure and is emitted when assuming a projection surface extending in a direction along the main surface of the base body and facing the optical element structure. The position of the center of gravity of the projection area on the projection surface of the optical element structure is deviated from the position of the center of gravity of the projection area on the projection plane of the light transmitted through the base body in a state where the optical element structure is not formed. The structure has been determined.

  In this way, by adjusting the configuration of the optical element structure, it is possible to shift the projection area on the projection plane of the light transmitted through the optical lens film in an arbitrary direction. For this reason, when the optical lens film is applied to, for example, a display device having a large screen by connecting a plurality of display panels, a non-display portion (for example, the display panel is a liquid crystal display panel) at the display panel connecting portion The optical lens film can be applied so that the projection area shifts to the area of the projection surface facing the portion provided with the sealing material. In this way, it is possible to arrange the projection area (that is, display an image) in the area facing the non-display portion on the projection plane. As a result, it is possible to realize a display device that is inconspicuous (high image quality) using a plurality of display panels without particularly changing the physical structure of the display panel.

  In the optical lens film, the optical element structure may include a plurality of convex portions extending in parallel with each other. The cross-sectional shape of the convex portion in the direction perpendicular to the extending direction of the convex portion may be a triangular shape. In this case, by adjusting the shape of the convex portion, the traveling direction of the light transmitted through the optical lens film can be bent, for example, in a direction perpendicular to the extending direction of the convex portion. As a result, the projection area on the projection plane can be shifted reliably. Here, the triangular shape includes a triangle and a shape in which at least one side (one side, two sides, or all sides) of the triangle is curved. The curved side may be convex outward, or may be convex inside the triangular shape. Alternatively, the curved side may include a convex portion on the outside and a convex portion on the inside. Further, only a part of the side may be curved.

  In the optical lens film, in the cross-sectional shape of the convex portion, when the angles formed by the pair of side walls of the convex portion with respect to the direction along the main surface are θ1 and θ2, the angle θ1 is more than 5 ° and less than 45 °. The shape of the convex portion may be determined such that θ2 exceeds 60 ° and (tan θ1) / (tan θ2) is less than 0.50. In this case, the projection area of the light emitted through the optical lens film can be shifted (translated) more reliably than when no optical lens film is present.

  In the optical lens film, the optical element structure may be formed on both the main surface and the back surface of the base body. In this case, since the traveling direction of the light transmitted through the optical lens film can be controlled by the optical element structures on both the main surface and the back surface of the base body, the shift amount of the projection area on the projection surface can be increased. Can do.

  According to the present invention, it is possible to realize a high-quality display device in which a plurality of display panels are connected.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

(Embodiment 1)
FIG. 1 is a partial perspective schematic view showing an optical lens film constituting Embodiment 1 of a display device according to the present invention. FIG. 2 is a schematic cross-sectional view of the optical lens film shown in FIG. FIG. 3 is a schematic cross-sectional view showing a liquid crystal display device as a first embodiment of a display device according to the present invention to which the optical lens film shown in FIGS. 1 and 2 is applied. With reference to FIGS. 1-3, the optical lens film and display apparatus by this invention are demonstrated.

  As shown in FIG. 1, the optical lens film 1 is in a state in which a plurality of linearly extending protrusions 2 are formed in parallel on the surface of a film-like base body 7. The convex portion 2 is formed on the entire surface of the base body 7 of the optical lens film 1. The shape of the cross section in the direction perpendicular to the extending direction of the convex portion 2 is triangular as shown in FIG. That is, the optical lens film 1 as an image shift lens film according to the present invention includes a base body 7 and a convex portion 2 as an optical element structure. The base body 7 is a sheet-like member having a main surface and a back surface located on the side opposite to the main surface. The convex portion 2 is a structure that is formed on at least one of the main surface and the back surface of the base body 7 and changes the light traveling direction. In the optical lens film 1, when a projection surface extending in the direction along the main surface of the base body 7 and facing the convex portion 2 is assumed, the base lens 7 and the convex portion 2 are transmitted and emitted. So that the centroid position of the projection area on the projection plane of the projected light deviates from the centroid position of the projection area on the projection plane of the light that is transmitted through the base body in the state where the convex portion 2 is not formed. The structure of part 2 has been determined. The convex portion 2 is a plurality of convex portions extending in parallel with each other, and the cross-sectional shape of the convex portion 2 in a direction perpendicular to the extending direction of the convex portion 2 is a triangular shape.

  The lengths L1 and L2 of the two inclined surfaces (side walls 8 and 9) of the convex portion 2 of the optical lens film 1 shown in FIG. 1, the pitch P corresponding to the width of the convex portion 2, and the back surface of the optical lens film 1 are parallel. The angles θ1 and θ2 of the side walls 8 and 9 with respect to the correct direction (the direction indicated by the line segment 18) are arrows from the back side of the optical lens film 1 (the side where the convex portions 2 are not formed) as shown in FIG. When light is incident as shown at 40, the projection is performed so that the region from which the light is emitted is shifted in the direction indicated by the arrow (that is, when the projection surface is arranged at a position facing the surface side of the optical lens film 1). The position of the center of gravity of the projection area of the light on the surface is determined so as to be different from the position where the optical lens film 1 is not present.

  Here, as a specific configuration example of the optical lens film 1, for example, the width P is 0.5 mm, the angle θ1 between the side wall 8 of the convex portion 2 and the line segment 18 is more than 5 ° and less than 45 °, The angle θ2 between the side wall 9 of the part 2 and the line segment 18 can exceed 60 °, and (tan θ1) / (tan θ2) can be less than 0.50. The angle θ1 can be more preferably 10 ° to 40 °, and still more preferably 15 ° to 35 ° C. Further, the angle θ2 can be more preferably more than 60 ° and not more than 90 °, still more preferably not less than 70 ° and not more than 80 °. Moreover, the said width P can be 0.1 mm or more and 1 mm or less, More preferably, it is 0.3 mm or more and 0.7 mm or less. The material of the optical lens film can be polycarbonate.

  In this way, the projection area of the light emitted through the optical lens film 1 can be shifted (translated) compared to the case where no optical lens film is present. For this reason, when the optical lens film 1 is applied to, for example, a display device having a large screen by connecting a plurality of display panels, a non-display portion (for example, the display panel is a liquid crystal display panel) at the connecting portion of the display panels. In some cases, the optical lens film 1 can be applied so that the projection area shifts to the area of the projection plane facing the portion provided with the sealant. In this way, the projection area can be shifted (that is, an image is displayed) to the area facing the non-display portion on the projection plane. As a result, it is possible to realize a display device that is inconspicuous (high image quality) using a plurality of display panels without particularly changing the physical structure of the display panel.

  Next, the manufacturing method by the mold using the metal mold | die of the optical lens film 1 mentioned above is demonstrated below.

  In the method for manufacturing the optical lens film 1, first, a mold in which a concave portion corresponding to the surface shape of the optical lens film 1 is formed is prepared. A resin thin film constituting the optical lens film 1 is set between the mold and the opposing surface plate. In this state, the resin thin film is heated. Thereafter, molding is performed by pressing the heated resin thin film so as to be sandwiched between the mold and the opposing surface plate. When the mold is removed after cooling, the optical lens film 1 shown in FIG. 1 and the like is obtained.

  For heating the resin thin film, for example, a method in which the resin thin film is sandwiched between the mold and the opposite surface plate and then heated, or a method in which only the resin thin film is heated in a non-contact state in advance is arbitrarily adopted. can do. Heating of the resin thin film can be done with a heater installed directly under the mold or the opposite surface plate, but a heating function has been introduced inside the mold and the opposite surface plate (inside the mold and the opposite surface plate). It is also possible to use a heating function by installing a heater or the like.

  In the heating of the resin thin film, an embodiment in which the heating is performed at a temperature higher than the resin flow start temperature is preferable. In this way, by heating the resin thin film to a temperature higher than the flow start temperature and then performing pressure processing to press the resin thin film with the mold and the opposing surface plate, utilizing the resin flow phenomenon, The shape of the recess formed on the surface of the mold can be transferred to the surface of the resin thin film. In this way, the optical lens film 1 according to the present invention can be manufactured.

  As the resin constituting the optical lens film 1, it is preferable to use a resin that melts in a relatively narrow temperature range and rapidly cures when cooled, since throughput is increased. Accordingly, polycarbonate, polyimide, polymethyl methacrylate, polyethersulfone, polysulfone, polyetherimide, and the like are preferable. In view of the value of refractive index, acrylic resin, the above polycarbonate, cyclic polyolefin, or the like may be used as the material constituting the optical lens film 1. The thickness of the resin thin film is not particularly limited, but is preferably 20 μm or more, and more preferably 100 μm or more.

  Next, the manufacturing method of the metal mold | die used in the manufacturing method of the optical lens film 1 mentioned above is demonstrated. First, a base substrate is prepared. A resist is formed on the substrate. As the substrate, for example, a metal substrate (conductive substrate) made of copper, nickel, stainless steel, or the like is used. Alternatively, a silicon substrate on which a metal material such as titanium or chromium is sputtered may be used. For the resist, a resin material mainly composed of polymethacrylate such as polymethyl methacrylate, or a chemically amplified resin material sensitive to X-rays or ultraviolet rays (UV) is used. The thickness of the resist can be arbitrarily set according to the mold to be formed, and can be set to several hundreds of μm, for example.

  Next, a mask is placed on the resist, and energy rays such as X-rays or UV are irradiated through the mask. When a mold having a high aspect ratio is required, an embodiment using X-rays (wavelength 0.4 nm) having a shorter wavelength than UV (wavelength 365 nm or the like) is preferable. In addition, the LIGA (Lithographie Galvanoformung Abformung) method using synchrotron radiation X-rays (hereinafter referred to as “SR”) enables deep lithography because of its high directivity among X-rays. For this reason, if the LIGA method is used, a fine structure (convex portion 2) having a height of several hundred μm can be manufactured in large quantities with high accuracy on the order of submicrons, so that a mold for a thick resin thin film is provided. This is advantageous. Below, the aspect which irradiates X-rays is illustrated.

  The mask arranged on the resist includes a translucent base material and an X-ray absorption layer formed on the surface of the translucent base material according to the pattern of the mold. SiN, SiC, diamond, titanium, or the like is used for the translucent substrate. For the X-ray absorption layer, heavy metals such as gold, tungsten, and tantalum or compounds thereof are used. When the resist on the substrate is, for example, a positive resist, X-ray irradiation causes the resist in the region irradiated with X-rays to be exposed and denatured (molecular chains are cut). The resist in the region shielded by the absorbing layer (not irradiated with X-rays) is not exposed. For this reason, by development, only a portion of the resist that has been altered by X-rays is removed, and a resin mold (made of a resist in a region not irradiated with X-rays) having a planar shape corresponding to the mask pattern is obtained. .

  Next, plating is performed on the resin mold, and a metal material layer is deposited on the surface of the resin mold. The metal material layer is formed so as to embed all the uneven portions of the resin mold, that is, to have a thickness larger than the height of the resin mold. The metal material layer can be formed by electroforming (electrolytic plating) or electroless plating. Electroforming refers to forming a metal material layer on a conductive substrate using a metal ion solution. A metal material layer can be deposited on the resin mold by performing electroforming using the conductive substrate as a power feeding portion.

  On the other hand, electroless plating is performed by adding sodium hypophosphite or the like as a reducing agent to a metal ion solution such as nickel and heating to 90 ° C. to 100 ° C., and applying a metal material layer on the resin mold without passing an electric current. Can be formed. If a catalyst such as Pd is previously applied to the surface of the resin mold, the plating efficiency can be improved.

  By plating beyond the height of the resin mold, a mold base can be formed. As the material for the metal material layer, nickel, copper, iron, rhodium, or an alloy thereof is used, and nickel alloy such as nickel or nickel manganese is preferable from the viewpoint of enhancing the wear resistance of the mold. After plating, wet etching is performed with acid or alkali, or the substrate that has been the base of the resin mold is removed by machining. Subsequently, when the resist constituting the resin mold is removed by wet etching or plasma ashing, a mold made of a metal material layer is obtained.

  In the manufacturing method described above, the mold is manufactured by removing the conductive substrate, but the mold can be manufactured by another method. This will be specifically described below.

  First, a resist is formed on a substrate. Next, a mask is placed on the resist, and lithography is performed in the same manner as described above. After the exposure, when the resist in the region irradiated with X-rays is removed by development, a resin mold made of the resist in the region not irradiated with X-rays is obtained.

  Next, a conductive substrate is formed so as to cover the top of the resist constituting the resin mold. Thereafter, the substrate that was the base of the resin mold is removed. Then, electroforming is performed using the conductive substrate as a plating electrode, and a metal material layer is deposited on the resin mold. Then, if necessary, the thickness of the metal material layer is adjusted to a predetermined thickness by polishing or grinding, and then the resin mold is removed by wet etching or plasma ashing. A mold is obtained. Since this mold uses the conductive substrate as a pedestal for the mold, the electroforming time required for forming the pedestal can be omitted. Further, since the pedestal is not formed by electroforming, there is little warpage of the mold due to internal stress.

  The mold used to form the optical lens film 1 can be manufactured by yet another method. For example, the mold can be manufactured by a method including a step of forming a resin mold by a mold, a step of forming a layer made of a metal material on the resin mold on the substrate by plating, and a step of removing the resin mold. .

  At this time, the parent mold used in the step of forming the resin mold by the mold can be manufactured by the above-described lithography. Therefore, a precise fine structure can be used as the parent mold. In this case, the child mold manufactured by the parent mold is also a fine microstructure. For this reason, the resin thin film can be finely molded with high dimensional accuracy. Moreover, since it molds with a metal mold | die, a molded object can be integrally molded with reproducibility. Further, the surface roughness (Ra) of the molded body can be suppressed to a predetermined value (for example, 10 nm) or less.

  A method for manufacturing a mold using the above-described mold will be specifically described below. First, a mold such as injection molding is performed using a mold having a convex portion (parent mold) to produce a resin mold having a concavo-convex shape portion. The resin mold material is polymethyl methacrylate, polypropylene, polycarbonate or the like. Next, after forming a conductive substrate so as to cover the top of the resin mold, the resin mold is polished or ground. By this polishing or grinding, the base portion of the resin mold is removed, and a pattern made of resin is formed on the surface of the conductive substrate. That is, a resin mold based on a conductive substrate is formed.

  Thereafter, electroforming is performed as a conductive substrate plating electrode, and a metal material layer is deposited on the resin mold. If necessary, the metal material layer is made to have a predetermined thickness by polishing or grinding, and then the resin mold is removed by wet etching or plasma ashing. As a result, a mold is obtained in which a metal material layer is formed in a predetermined pattern on the surface of the conductive substrate using the conductive substrate as a base. In this mold, since the conductive substrate is used as a base (base) of the mold, the electroforming time required for forming the base can be omitted. Further, since the pedestal is not formed by electroforming, there is little warpage of the mold due to internal stress.

  The mold described above can also be manufactured by another method. This will be specifically described below.

  First, molding is performed using a mold having a convex portion (parent mold) to manufacture a resin mold. Next, a metal material layer is formed on the resin mold by electroless plating. Thereafter, the mold is obtained by removing the resin mold by wet etching or plasma ashing.

  Next, a liquid crystal display device as a display device 10 to which the optical lens film 1 shown in FIGS. 1 and 2 is applied will be described with reference to FIG.

  The display device 10 shown in FIG. 3 includes a backlight 11, an LCD unit 14 disposed on the backlight, the optical lens film 1 according to the present invention disposed on the display surface side of the LCD unit 14, and an optical lens. And a transparent plate 19 disposed on the film 1. Specifically, optical films such as a diffusion plate 12 and a brightness enhancement film 13 are disposed on the light exit surface of the backlight 11. An LCD unit 14 is disposed on the optical film. The LCD unit 14 includes a liquid crystal cell 15, a retardation plate 16 disposed on each of the front and back surfaces of the liquid crystal cell 15, and a polarizing plate 17 disposed on the outer peripheral surface of each retardation plate 16. Is provided. The liquid crystal cell 15 has a structure in which a thin film transistor and a liquid crystal for driving a liquid crystal are arranged between two glass substrates arranged to face each other with a spacer interposed therebetween. In the LCD unit 14, the optical lens film 1 according to the present invention is disposed on the exit surface opposite to the surface on the backlight 11 side. Further, a transparent plate 19 is disposed on the optical lens film 1. The transparent plate 19 is a transparent or translucent plate-like body or film, and any material can be used as the material thereof. In addition, although this transparent plate 19 is arrange | positioned as a protection member for protecting LCD unit 14 grade | etc., It can also be set as the structure which does not arrange | position the said transparent plate.

  In the display device 10 shown in FIG. 3, the light emitted from the backlight 11 enters the LCD unit 14 from the back side through the diffusion plate 12 and the brightness enhancement film 13. Then, the liquid crystal in the liquid crystal cell 15 in the LCD unit 14 is controlled in its orientation direction and the like by an electric field, whereby display of each pixel of the LCD unit 14 is controlled. As a result, the light constituting the predetermined image is emitted from the surface side of the LCD unit 14 (the side where the optical lens film 1 is disposed). The locus of light incident on the optical lens film 1 from the LCD unit 14 is bent by the action of the optical lens film 1. Therefore, when the optical lens film 1 is not present in the visual display area 35 (the display area on the transparent board 19 of the image that can be visually recognized by the user watching the display device 10), which is the display area projected on the transparent board 19. In other words, the distance is shifted from the LCD unit display area 25 which is a display area projected onto the transparent plate 19 by a distance W.

  FIG. 4 is a schematic cross-sectional view showing a first modification of the display device according to the present invention shown in FIG. A first modification of the display device according to the present invention will be described with reference to FIG.

  The display device 10 shown in FIG. 4 basically has the same structure as the display device 10 shown in FIG. 3, but the arrangement of the optical lens film 1 is different. That is, in the display device 10 shown in FIG. 4, the optical lens film 1 is disposed between the LCD unit 14 and the backlight 11, more specifically, between the LCD unit 14 and the brightness enhancement film 13. . Even with such a structure, the same effects as those of the display device 10 shown in FIG. 3 can be obtained.

  FIG. 5 is a schematic cross-sectional view showing a second modification of the display device according to the present invention shown in FIG. A second modification of the display device according to the present invention will be described with reference to FIG.

  The display device 10 shown in FIG. 5 includes a shift display unit 60 and a transparent plate 19. The shift display unit 60 includes the display unit 20 and the optical lens film 1 disposed on the display surface of the display unit. As the display unit 20, any structure can be adopted as long as it is a display unit that emits light. For example, as the display unit 20, any type of display unit such as a plasma display unit, a field emission display unit (FED unit), or an EL (electroluminescence) unit can be adopted. In this case, the same effect as that of the display device shown in FIG. 3 can be obtained.

  FIG. 6 is a schematic cross-sectional view showing a first modification of the optical lens film shown in FIG. FIG. 7 is an enlarged schematic cross-sectional view for explaining the structure of the optical lens film shown in FIG. With reference to FIG. 6 and FIG. 7, the 1st modification of the optical lens film shown in FIG. 1 is demonstrated.

  The optical lens film 1 shown in FIGS. 6 and 7 basically has the same configuration as the optical lens film 1 shown in FIGS. 1 and 2, but the cross-sectional shape (convex shape) of the convex portion 2 extending linearly. The cross-sectional shape in a direction perpendicular to the extending direction of the portion 2 is different. That is, in the optical lens film 1 shown in FIG. 6 and FIG. 7, the side walls 8 and 9 of the convex part 2 formed with the pitch P are curved outwardly convex. Also in this case, the same effect as the optical lens film 1 shown in FIGS. 1 and 2 can be obtained.

  Here, regarding the side wall 8 in the convex portion 2 of the optical lens film 1 shown in FIGS. 6 and 7, an angle formed between the tangent passing through the center point 50 and the line segment 18 is formed between the side wall 8 and the line segment 18. The angle is defined as θ1. For the side wall 9 as well, the angle formed between the tangent line passing through the center point 51 and the line segment 18 is defined as the angle θ2 formed between the side wall 9 and the line segment 18. The length of the straight line connecting the apex angle that is the connection point between the side wall 8 and the side wall 9 and the intersection of the side wall 8 and the line segment 18 is defined as the length L 1 of the side wall 8. The length of the straight line connecting the apex angle and the intersection of the side wall 9 and the line segment 18 is defined as the length L 2 of the side wall 9. The pitch P, the angles θ1, θ2 and the lengths L1, L2 defined in this way are the same as the pitch P, the angles θ1, θ2, and the lengths L1, L2 in the convex portion 2 shown in FIGS. 1 and 2, for example. Can be a value.

  FIG. 8 is a schematic cross-sectional view showing a second modification of the optical lens film shown in FIG. FIG. 9 is an enlarged schematic cross-sectional view for explaining the structure of the optical lens film shown in FIG. With reference to FIG. 8 and FIG. 9, the 2nd modification of the optical lens film shown in FIG. 1 is demonstrated.

  The optical lens film 1 shown in FIGS. 8 and 9 basically has the same configuration as that of the optical lens film 1 shown in FIGS. 1 and 2, but the cross-sectional shape (convex shape) of the convex portion 2 extending linearly. The cross-sectional shape in a direction perpendicular to the extending direction of the portion 2 is different. That is, in the optical lens film 1 shown in FIG. 8 and FIG. 9, the side walls 8 and 9 of the convex part 2 formed with the pitch P are inwardly convex curved surfaces. Also in this case, the same effect as the optical lens film 1 shown in FIGS. 1 and 2 can be obtained.

  Here, with respect to the side wall 8 in the convex portion 2 of the optical lens film 1 shown in FIGS. 8 and 9, an angle formed between the tangent passing through the center point 50 and the line segment 18 is formed between the side wall 8 and the line segment 18. The angle is defined as θ1. For the side wall 9 as well, the angle formed between the tangent line passing through the center point 51 and the line segment 18 is defined as the angle θ2 formed between the side wall 9 and the line segment 18. The length of the straight line connecting the apex angle that is the connection point between the side wall 8 and the side wall 9 and the intersection of the side wall 8 and the line segment 18 is defined as the length L 1 of the side wall 8. The length of the straight line connecting the apex angle and the intersection of the side wall 9 and the line segment 18 is defined as the length L 2 of the side wall 9. The pitch P, the angles θ1, θ2 and the lengths L1, L2 defined in this way are the same as the pitch P, the angles θ1, θ2, and the lengths L1, L2 in the convex portion 2 shown in FIGS. 1 and 2, for example. Can be a value.

(Embodiment 2)
FIG. 10 is a schematic sectional view showing Embodiment 2 of the display device according to the present invention. FIG. 11 is a schematic plan view for explaining the arrangement of the image shift lens film in the display device shown in FIG. FIG. 12 is a schematic diagram for explaining a visual display area projected on a transparent plate in the display device shown in FIG. A second embodiment of the display device will be described with reference to FIGS.

  Referring to FIGS. 10 to 12, the display device is a display device having a large screen by connecting two display units 20, and includes two shift display units 60 including the display unit 20 and the optical lens film 1. And a transparent plate 19 disposed on the opposite side of the display unit 20 when viewed from the optical lens film 1. Note that the transparent plate 19 is not an essential configuration, and may be configured such that the transparent plate 19 is not installed. One set of shift display units 60 are arranged adjacent to each other. As the display unit 20 constituting the shift display unit 60, any configuration can be adopted, but for example, a liquid crystal display unit may be used. The configuration of the optical lens film 1 is basically the same as the configuration of the optical lens film 1 shown in FIGS.

  The display units 20 of the adjacent shift display units 60 may be arranged with a gap therebetween as shown in FIG. 10, but may be in a state where the side surfaces are in contact with each other.

  In the optical lens film 1 in each shift display unit 60, the ridgeline 3 of the convex part 2 (see FIG. 1) is formed so as to extend in the direction perpendicular to the direction shown by the arrow 27 as shown in FIG. Here, the arrow 27 indicates the direction in which the visual display area 35 shifts in the transparent plate 19. That is, the optical lens film 1 is arranged so as to shift the display area of the image by the light emitted from the emission area 45 of one display unit 20 to the other display unit 20 side. From another point of view, the optical lens film 1 is configured to shift the visual display area 35 toward the connection portion of the set of shift display units 60.

  One visual display area 35 by light from one shift display area on the transparent plate 19 is continuous with the other visual display area 35 by light from another adjacent shift display unit 60 (to form a gap). Not). As a result, using two shift display units 60, it is possible to obtain one continuous display image (one display area in which two visual display areas 35 are continuously arranged) as shown in FIG. A display device can be realized.

  In addition, in order to implement | achieve such one continuous display image, the shape of the convex part 2 (refer FIG. 1) in the optical lens film 1, the position with respect to the display unit 20 of an optical lens film, etc. can be adjusted arbitrarily. .

(Embodiment 3)
FIG. 13 is a schematic plan view for explaining the arrangement of the optical lens films constituting Embodiment 3 of the display device according to the present invention. FIG. 14 is a schematic diagram for explaining a projection area projected on a transparent plate in the display device shown in FIG. A third embodiment of the display device will be described with reference to FIG. 13 and FIG.

  Referring to FIGS. 13 and 14, the display device according to the present invention has basically the same configuration as the display device shown in FIGS. 10 to 12, but one display using four shift display units. The screen is different. The four shift display units each having the optical lens film 1 are arranged in a configuration of 2 rows × 2 columns as shown in FIG. As shown in FIG. 13, a gap is formed between the emission areas 45 of the display unit in the shift display unit. In order to eliminate the influence of the gap and form one large image as shown in FIG. 14 by the four shift display units, the four visual display areas 35 on the transparent plate 19 are arranged so as to be continuous without a gap. Need to be done.

  Therefore, in the display device shown in FIGS. 13 and 14, as shown in FIG. 13, toward the central portion of the display device where the corners of the four shift display units are gathered (toward the direction indicated by the arrow 27 in FIG. 13). ), It is necessary to shift the position of the visual display area 35 in each shift display unit. For this reason, in the optical lens film 1 in each shift display unit, a convex portion is formed so that the ridgeline 3 extends in a direction perpendicular to the direction indicated by the arrow 27 as shown in FIG. From a different viewpoint, the optical lens film 1 in each shift display unit is directed from the corner of each shift display unit farthest from the center of the display device toward the center of the display device (shown by an arrow 27). The ridgeline 3 of the convex portion 2 extends in a direction orthogonal to (direction). If it does in this way, the position of the visual display area 35 in each shift display unit can be shifted near the above-mentioned central part by controlling the shape of convex part 2. As a result, one large screen can be configured using four shift display units.

  In the second embodiment and the third embodiment described above, the transparent plate 19 is disposed as a protective member on the front surface of the shift display unit. However, the transparent plate 19 is not an essential configuration, and depending on the device configuration, the transparent plate 19 may be used. It is good also as a structure which does not arrange | position 19.

  In the above-described embodiment, the convex portion 2 is formed on only one main surface of the optical lens film 1, but the surface of the optical lens film 1 on which the convex portion 2 is formed is on the shift display unit 60 side. May be arranged on the side opposite to the side facing the shift display unit 60. Moreover, in the optical lens film 1, you may form the convex part 2 on both surfaces of a surface and a back surface. In the optical lens film 1, the shape of the convex portion 2 can be a triangular shape. Specifically, the cross-sectional shape of the convex portion 2 may be a triangle or a shape in which at least one side (one side, two sides, or all sides) of the triangle is curved. The curved side may be convex outward or may be convex inside the convex part 2. Alternatively, the curved side may include a convex portion on the outside and a convex portion on the inside. Further, only a part of the side may be curved.

(Example)
In order to confirm the effect of the present invention, a film sample in which the shape of the convex portion of the image shift lens film was changed was created and the effect was confirmed.

(sample)
Samples (Sample 1 to Sample 4) of the image shift lens film having the structure shown in FIGS. 1 and 2 and having the angles θ1 and θ2 changed were prepared. The thickness of the base body of the image shift lens film was 300 μm, and the pitch P of the convex portions was 50 μm. An acrylic resin was used as the film material.

(Measuring method)
The image shift lens film of each sample described above is arranged on the surface of the liquid crystal display device, and the image is shifted by displaying the image on the liquid layer display device (that is, shifted from the region of the emission surface of the liquid crystal display device). Whether the image can be confirmed at the position) and the quality of the image (whether it is a double image or the like) were visually evaluated.

(Measurement result)
The measurement results are shown in Table 1.

  Table 1 also shows the values of the angle θ1 and the angle θ2 of each sample. The column of “shifted image” in Table 1 shows the result of confirming whether or not the image has been shifted. When the position of the image is recognized to be shifted, a circle is indicated. Is described. In addition, the column of “double image” in Table 1 shows the evaluation result as to whether or not the image looked double. When the double image is not recognized, ○, and when it is recognized, × Is described.

  As can be seen from Table 1, a shift of the image was observed in all of samples 1 to 4, but a double image was also detected for sample 2. For this reason, in order to obtain an image shifting effect and to obtain an image of good quality without occurrence of a double image, θ1 <θ2 and (tan θ1) / (tan θ2) <0.5, It is considered that the image shift lens film may be formed so as to satisfy the conditions that the angle θ1 is more than 5 ° and less than 45 ° and the angle θ2 is more than 60 °.

  It should be understood that the embodiments and examples disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention is particularly advantageously applied to an optical lens film used in a display device that forms a large screen by combining a plurality of display units.

It is a partial perspective schematic diagram which shows the optical lens film which comprises Embodiment 1 of the display apparatus according to this invention. It is a cross-sectional schematic diagram of the optical lens film shown in FIG. It is a cross-sectional schematic diagram which shows the liquid crystal display device as Embodiment 1 of the display apparatus by this invention to which the optical lens film shown in FIG. 1 and FIG. 2 is applied. It is a cross-sectional schematic diagram which shows the 1st modification of the display apparatus by this invention shown in FIG. It is a cross-sectional schematic diagram which shows the 2nd modification of the display apparatus by this invention shown in FIG. It is a cross-sectional schematic diagram which shows the 1st modification of the optical lens film shown in FIG. It is an expanded sectional schematic diagram for demonstrating the structure of the optical lens film shown in FIG. It is a cross-sectional schematic diagram which shows the 2nd modification of the optical lens film shown in FIG. It is an expanded sectional schematic diagram for demonstrating the structure of the optical lens film shown in FIG. It is a cross-sectional schematic diagram which shows Embodiment 2 of the display apparatus by this invention. It is a plane schematic diagram for demonstrating arrangement | positioning of the image shift lens film in the display apparatus shown in FIG. It is a schematic diagram for demonstrating the visual recognition display area projected on the transparent plate in the display apparatus shown in FIG. It is a plane schematic diagram for demonstrating arrangement | positioning of the optical lens film which comprises Embodiment 3 of the display apparatus by this invention. It is a schematic diagram for demonstrating the projection area | region projected on the transparent plate in the display apparatus shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Optical lens film, 2 Convex part, 3 Ridge line, 7 Base body, 8, 9 Side wall of a convex part, 10 Display apparatus, 11 Backlight, 12 Diffuser plate, 13 Brightness enhancement film, 14 LCD unit, 15 Liquid crystal cell, 16 Phase difference plate, 17 polarizing plate, 18 line segment, 19 transparent plate, 20 display unit, 25 unit display area, 27, 40 arrow, 35 visual display area, 45 emission area, 50, 51 center point, 60 shift display unit.

Claims (3)

A sheet-like base body having a main surface and a back surface opposite to the main surface;
An optical element structure that is formed on at least one of the main surface and the back surface of the base body and changes a traveling direction of light;
The projection of light transmitted through the base body and the optical element structure, assuming a projection plane extending in a direction along the main surface of the base body and facing the optical element structure The optical element so that the position of the center of gravity of the projection area on the surface deviates from the position of the center of gravity of the projection area on the projection surface of the light that passes through the base body in a state where the optical element structure is not formed. The structure of the structure has been determined, the optical lens film. The optical element structure includes a plurality of convex portions extending in parallel with each other,
The optical lens film according to claim 1, wherein a cross-sectional shape of the convex portion in a direction perpendicular to a direction in which the convex portion extends is a triangular shape.   In the cross-sectional shape of the convex portion, when the angles formed by the pair of side walls of the convex portion with respect to the direction along the main surface are θ1 and θ2, the angle θ1 is more than 5 ° and less than 45 °, and the angle θ2 is 60. 3. The optical lens film according to claim 2, wherein the shape of the convex portion is determined so that the angle exceeds ± and (tan θ1) / (tan θ2) is less than 0.50.

Images