JP2011232446A - Optic lens film and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optic lens film capable of improving positioning accuracy and a display device using the optic lens film.SOLUTION: An optic lens film 1 comprises a base body having a main surface, a plurality of convex portions 2 serving as optic element structures and a first alignment mark section 18. A convex portion 2 is an element that changes a travelling direction of light formed on the main surface of the base body. The plurality of convex portions 2 are configured to be parallel to each other and extend linearly. The first alignment mark section 18 crosses the plurality of convex portions 2 and extends linearly.

Description

  The present invention relates to an optical lens film and a display device, and more particularly to an optical lens film having an alignment mark portion and a display device using the optical film lens.

  Conventionally, an optical lens film and a display device using the optical lens film are known (see, for example, Japanese Patent Application Laid-Open No. 2004-280087 (hereinafter referred to as Patent Document 1)).

  Patent Document 1 discloses a display device including a lenticular lens as an optical lens film. In the display device disclosed in Patent Document 1, an alignment mark portion is formed on a lenticular lens, and a display unit side alignment mark is also formed on a transparent substrate facing the lenticular lens in a liquid crystal display device that is a display unit. Yes. A lenticular lens is positioned with respect to the liquid crystal display device using the alignment mark portion and the display unit side alignment mark. The alignment mark part of the lenticular lens is a protrusion having a cross shape in plan view, and the alignment mark on the display unit side of the transparent substrate has a square shape in plan view, and the portion corresponding to the shape of the alignment mark part has been removed. It is a protrusion.

JP 2004-280087 A

  However, the conventional display device described above has the following problems. That is, in the lenticular lens of Patent Document 1, since the shape of the alignment mark portion is completely different from the shape of the lens structure portion, the alignment mark portion may be formed using a manufacturing method different from that of the lens structure portion. At this time, it may be difficult to sufficiently improve the positional accuracy and shape accuracy of the alignment mark with respect to the lens structure. In this case, the improvement of positioning accuracy using the alignment mark portion may be insufficient. Further, in the lenticular lens of Patent Document 1, a very small alignment mark portion is formed outside the lens structure portion. Further, it is considered that the alignment mark portion has a cross shape in plan and serves also as an alignment mark in the vertical direction and the horizontal direction. That is, it is considered that an independent alignment mark is not used for positioning in the vertical direction and the horizontal direction. Also from this point, when the positional accuracy and the shape accuracy of the alignment mark with respect to the lens structure are insufficient, the positioning accuracy may be lowered in both the vertical direction and the horizontal direction.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an optical lens film capable of improving positioning accuracy and a display device using the optical lens film. Is to provide.

  An optical lens film according to the present invention includes a base body having a main surface, a plurality of optical element structures, and a first alignment mark portion. The optical element structure is an element that is formed on the main surface of the base body and changes the traveling direction of light. The first alignment mark portion is formed on the main surface of the base body. The plurality of optical element structures are formed so as to extend linearly in parallel with each other. The first alignment mark portion extends linearly across the plurality of optical element structures.

  In this case, the first alignment mark portion formed on the main surface of the base body as in the optical element structure has a sufficient size so as to extend linearly across the plurality of optical element structures. Therefore, it is possible to reduce the possibility that the positional accuracy and the shape accuracy of the alignment mark with respect to the lens structure are lowered compared to the case where an extremely small alignment mark is formed in a region different from the optical element structure. As a result, it is possible to realize an optical lens film that can reduce the possibility of deterioration in positioning accuracy.

  Moreover, since the first alignment mark portion has a shape extending linearly across the optical element structure, it is used for alignment of the optical lens film in the extending direction (extending direction) of the optical element structure. become. Further, for alignment in the direction intersecting the extending direction of the optical element structure in the optical element structure, another alignment mark can be applied. Therefore, the positional accuracy and shape of the first alignment mark portion with respect to the lens structure Even if a problem occurs in accuracy, the alignment accuracy in the direction intersecting the extending direction of the optical element structure is not affected.

  In the optical lens film, the first alignment mark portion may include a plurality of first alignment structures. In this case, since the first alignment mark portion includes a plurality of first alignment structure portions, the size of the first alignment mark portion is smaller than that of the entire first alignment mark portion by using the plurality of first alignment structure portions. Positioning can be performed at the size (the size of the first alignment mark portion or the first alignment structure portion) level. As a result, an optical lens film that can further improve the positioning accuracy can be realized.

  In the optical lens film, the width of the first alignment mark portion may be narrower than the width of the plurality of optical element structures. In this case, positioning can be performed at a level (size of the first alignment mark portion or first alignment structure portion) that is smaller than the size of the optical element structure. As a result, an optical lens film that can further improve the positioning accuracy can be realized.

  In the optical lens film, the width of the first alignment mark portion may be 0.1 to 5 times the width of the optical element structure. As described above, the first alignment structure portion having a size corresponding to the positioning accuracy of the optical lens film is realized by appropriately selecting the width (size) of the first alignment mark portion (and the first alignment structure portion). it can.

  In the optical lens film, the plurality of optical element structures are a plurality of convex portions extending linearly in parallel, and the cross-sectional shape of the convex portion in a direction perpendicular to the direction in which the convex portions extend is a semicircular shape. There may be. The plurality of first alignment structural portions may be a plurality of first alignment convex portions that intersect with the plurality of convex portions and extend linearly.

  In this case, the present invention can be applied to so-called lenticular lenses. In addition, since the first alignment structure portion is a first alignment protrusion that extends linearly across the protrusion of the optical element structure, when the optical lens film is formed, the alignment portion and the alignment portion are aligned. The convex portion can be formed at the same time. For example, when an optical lens film is molded, when the shape for molding the convex portion of the optical element structure is formed in the mold, the arrangement of the mold to be processed is rotated (for example, rotated by 90 °). Thus, the shape for molding the first alignment convex portion can be formed on the mold at the same time. And the optical lens film by this invention can be obtained by mold-molding resin etc. using the said type | mold.

  In the optical lens film, in the first alignment structure portion, a boundary portion between the plurality of first alignment convex portions or a boundary portion between the first alignment convex portion and the convex portion intersects with the plurality of convex portions. It may extend linearly. In this case, the boundary portion can be used as a positioning mark in the extending direction of the plurality of convex portions.

  The optical lens film may further include a second alignment mark portion that extends linearly in parallel with the plurality of optical element structures. In this case, positioning of the optical lens film in a direction (vertical direction) intersecting with the extending direction of the optical element structure can be performed using the second alignment mark portion. Further, since the second alignment mark portion has a shape extending linearly in parallel with the optical element structure, the optical element structure and the second alignment mark portion are formed simultaneously when forming the optical lens film. be able to. For example, when an optical lens film is molded, when a shape for molding an optical element structure is formed in the mold, a shape for molding the second alignment mark portion is simultaneously formed in the mold. Can do. And the optical lens film by this invention can be obtained by mold-molding resin etc. using the said type | mold.

  In the optical lens film, the second alignment mark portion may include a plurality of second alignment structure portions having a width narrower than a width of the plurality of optical element structures. In this case, the second alignment mark part formed on the main surface of the base body as in the optical element structure includes a plurality of second alignment structure parts having a width narrower than the width of the optical element structure. By using a plurality of second alignment structure portions, positioning can be performed at a level (size of the second alignment structure portion) smaller than the size of the optical element structure or the entire alignment mark portion. As a result, it is possible to obtain an optical lens film that can further improve the positioning accuracy in the direction intersecting the extending direction of the optical element structure.

  In the optical lens film, the width of the second alignment mark portion may be not less than 0.1 times and not more than 5 times the width of the optical element structure. Thus, by appropriately selecting the width (size) of the second alignment mark part (and also the second alignment structure part), an alignment structure having a size corresponding to the positioning accuracy of the optical lens film can be realized.

  In the optical lens film, the second alignment structure portion may be a plurality of second alignment convex portions extending linearly in parallel with the plurality of optical element structures. The plurality of optical element structures may be a plurality of convex portions extending linearly in parallel. Moreover, the cross-sectional shape of the convex part in a direction perpendicular to the extending direction of the convex part may be a semicircular shape. In this case, since the second alignment structure portion is a second alignment convex portion that extends linearly in parallel with the optical element structure, when the optical lens film is formed, the optical element structure (for example, the convex portion) is formed. Part) and the convex part for alignment can be formed simultaneously. For example, when molding an optical lens film, when forming a shape for molding the convex portion of the optical element structure in the mold, the same cutting tool is used to mold the alignment convex portion at the same time. The shape can be formed in the mold.

  In the optical lens film, in the second alignment structure portion, a boundary portion between the plurality of second alignment convex portions or a boundary portion between the second alignment convex portion and the optical element structure is a plurality of optical element structures. You may extend linearly in parallel. In this case, the boundary portion can be used as a positioning mark in a direction perpendicular to the extending direction of the plurality of optical element structures.

  In the optical lens film, the first alignment mark portion and the second alignment mark portion may include a crossing portion that crosses each other. At the intersection, the structure of the second alignment mark part may be formed.

  In this case, the second alignment mark portion is preferentially formed at the intersection, and the second alignment mark portion is not divided by the first alignment mark portion. Here, the positioning accuracy in the direction (crossing direction) intersecting the extending direction of the plurality of optical element structures is higher than the positioning accuracy in the direction (extending direction) along the extending direction of the optical element structure. May be required. This is because a plurality of optical element structures are arranged in a direction crossing the extending direction of the optical element structure (having a periodic structure), and thus the optical action of the optical lens film This is because the positioning accuracy in the direction is important in order to reliably exhibit the above. In such a case, the second alignment mark portion used for positioning in the intersecting direction is formed with priority at the intersecting portion, so that the second alignment mark portion is divided at the intersecting portion. Generation | occurrence | production of the problem that the precision of positioning using a 2nd alignment mark part deteriorates can be suppressed.

  A display device according to the present invention includes a display unit having a display surface and the optical lens film. The optical lens film is laminated with the display unit so as to overlap the display surface of the display unit. In this way, a display device including an optical lens film positioned with high accuracy with respect to the display unit can be realized. For this reason, since the visual effect by the said optical lens film can be acquired reliably, the display apparatus excellent in display quality is realizable.

  In the display device, in the optical lens film, the plurality of optical element structures may be a plurality of convex portions extending linearly in parallel. The cross-sectional shape of the convex portion in the direction perpendicular to the direction in which the convex portion extends may be semicircular. The first alignment mark portion may include a plurality of first alignment convex portions that intersect with the plurality of convex portions and extend linearly. The display unit may include a display unit side first alignment mark formed in a portion facing the optical lens film. In the display unit and the optical lens film, either the display unit side first alignment mark, a boundary between the plurality of first alignment convex portions, or a boundary portion between the first alignment convex portion and the convex portion overlaps. It may be positioned as follows.

  In this case, since the optical lens film is positioned with respect to the display unit using the boundary portion smaller in size than the first alignment mark portion, the optical lens film can be positioned with high accuracy. For this reason, since the visual effect by the said optical lens film can be acquired reliably, the display apparatus excellent in display quality is reliably realizable.

  In the display device, the optical lens film may further include a second alignment mark portion extending linearly in parallel with the plurality of convex portions. The second alignment mark portion may include a plurality of second alignment convex portions extending linearly in parallel with the plurality of convex portions. The display unit may include a display unit side second alignment mark formed in a portion facing the optical lens film. In the display unit and the optical lens film, either the display unit side second alignment mark, the boundary between the plurality of second alignment convex portions, or the boundary portion between the second alignment convex portions and the convex portions overlap. It may be positioned as follows. In this case, in addition to the first alignment mark part, the optical lens film is positioned with respect to the display unit by using the boundary part having a size smaller than that of the second alignment mark part. can do. For this reason, since the visual effect by the said optical lens film can be acquired reliably, the display apparatus excellent in display quality is reliably realizable.

  In the optical lens film and the display device, the first alignment protrusion and / or the second alignment protrusion in a direction perpendicular to the extending direction of the first alignment protrusion and / or the second alignment protrusion. The cross-sectional shape of the part may be semicircular. In this case, the first and second alignment convex portions and the convex portion of the optical element structure have similar cross-sectional shapes. Therefore, for example, when the optical lens film is manufactured by molding as described above, as a cutting tool used for creating a shape corresponding to the alignment convex portion in the mold used in the molding, the convex portion of the optical element structure is used. A cutting tool having the same type of cutting edge as the cutting tool used to create the corresponding shape can be used. Further, if the cutting amount of the cutting tool is changed between the convex portion and the first and second alignment convex portions (that is, the height between the convex portion and the first and second alignment convex portions is changed). Thus, the same cutting tool can be used for the first and second alignment convex portions and the convex portion. For this reason, the manufacturing process of an optical lens film can be simplified.

  In the optical lens film and the display device, the first alignment convex portion and / or the second alignment convex portion in a direction perpendicular to the extending direction of the first alignment convex portion and / or the second alignment convex portion. The cross-sectional shape may be triangular. In this case, in the first alignment mark portion and / or the second alignment mark portion, in addition to the boundary portion (boundary line) between the plurality of alignment convex portions, the individual alignment convex portions also have the above-mentioned triangular apexes. Corner portions that are linearly formed are formed at corresponding positions. For this reason, in addition to the boundary portion, the corner portion can also be used as a reference for positioning. For this reason, the optical lens film can be positioned with higher positional accuracy.

  According to the present invention, it is possible to obtain an optical lens film capable of improving positioning accuracy and a display device using the optical lens film.

It is a plane schematic diagram which shows Embodiment 1 of the optical lens film according to this invention. It is a partial perspective schematic diagram of the optical lens film shown in FIG. It is a cross-sectional schematic diagram in line segment III-III of FIG. It is a flowchart for demonstrating the manufacturing method of the optical lens film shown in FIGS. It is a flowchart for demonstrating the process which produces the type | mold in the flowchart shown in FIG. It is a schematic diagram for demonstrating the manufacturing method of the display apparatus using the optical lens film shown in FIGS. It is an expansion schematic diagram for demonstrating the manufacturing method of the display apparatus using the optical lens film shown in FIGS. It is a cross-sectional schematic diagram which shows the liquid crystal display device as a display apparatus to which the optical lens film by this invention is applied. It is a cross-sectional schematic diagram which shows the liquid crystal display device as another example of the display apparatus to which the optical lens film by this invention is applied. It is a cross-sectional schematic diagram for demonstrating the 1st modification of the optical lens film shown in FIGS. It is a cross-sectional schematic diagram for demonstrating the 2nd modification of the optical lens film shown in FIGS. It is a plane schematic diagram which shows Embodiment 2 of the optical lens film according to this invention. It is a cross-sectional schematic diagram in line segment XIII-XIII of FIG.

  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)
A first embodiment of an optical lens film according to the present invention will be described with reference to FIGS.

  The optical lens film 1 shown in FIGS. 1 to 3 includes a base body 7 having a main surface, a convex portion 2 as a plurality of optical element structures, and a first alignment mark portion 18. The convex portion 2 is an optical element that is formed on the main surface of the base body 7 and changes the traveling direction of light, and is a lens having a semicircular cross section. Moreover, the some convex part 2 is arrange | positioned so that it may mutually be parallel and may extend linearly. There is one first alignment mark portion 18 in the vicinity of the end portion of the optical lens film 1 in the extending direction of the convex portion 2 (near the end portion in the vertical direction in FIG. 1) on the main surface of the base body 7 (total 2 One) is formed. The first alignment mark portion 18 is positioned at a distance L from the end portion of the optical lens film 1 (that is, the distance between the end portion of the optical lens film 1 and the outer peripheral end of the first alignment mark portion 18 is the distance L described above. Is formed). The distance L can be set to 1 mm or less, for example.

  In FIG. 1, the convex portion 2 as the optical element structure is also formed in the region between the end portion of the optical lens film 1 and the first alignment mark portion 18, but the convex portion 2 is not formed in the region. A configuration (that is, a configuration in which the surface of the region is flat) may be employed. In FIG. 1, two first alignment mark portions 18 are formed, but three or more may be formed.

The first alignment mark portion 18 includes first alignment convex portions 19 that are a plurality of alignment structural portions having a width P ₁ (see FIG. 2) narrower than the width P ₀ (see FIG. 2) of the plurality of convex portions 2. Can be included. In the optical lens film 1 shown in FIGS. 1 to 3, the first alignment mark portion 18 is constituted by three first alignment convex portions 19. The first alignment convex portion 19 is formed so as to intersect with the extending direction of the convex portion 2 (for example, to be orthogonal). The cross-sectional shape of the first alignment convex portion 19 in the extending direction of the convex portion 2 is semicircular. Note that the number of the first alignment convex portions 19 included in the first alignment mark portion 18 may be two, or four or more. Furthermore, as shown in FIG. 1, the two first alignment mark portions 18 may have the same configuration, but may have different configurations. For example, the number and size of the first alignment convex portions 19 included in each of the two first alignment mark portions 18 may be different.

  In this way, the first alignment mark portion 18 formed on the main surface of the base body 7 as well as the convex portion 2 as the optical element structure is sufficiently extended so as to extend linearly across the plurality of convex portions 2. Have the right size. Therefore, it is possible to reduce the possibility that the positional accuracy and the shape accuracy of the alignment mark with respect to the lens structure are lowered as compared with the case where an extremely small alignment mark is formed in a region different from the convex portion 2. As a result, it is possible to realize the optical lens film 1 capable of reducing the possibility that the positioning accuracy is deteriorated.

  Moreover, since the said 1st alignment mark part has the shape which cross | intersects the convex part 2 and extends linearly, it is used in order to align the optical lens film 1 in the direction (extension direction) where the convex part 2 extends. It will be. Since another alignment mark can be applied for the alignment in the direction intersecting the extending direction of the convex portion 2 in the convex portion 2, the positional accuracy and shape of the first alignment mark portion with respect to the lens structure Even if there is a problem in accuracy, the alignment accuracy in the direction intersecting the extending direction of the convex portion 2 is not affected.

Further, since the first alignment mark portion 18 includes a plurality of first alignment convex portions 19 having a width P ₁ narrower than the width P ₀ of the convex portion 2 which is an optical element structure, the plurality of first alignments. By using the convex portion 19, the optical lens film 1 can be positioned at a level (size of the first alignment convex portion 19) that is smaller than the overall size of the convex portion 2 or the first alignment mark portion 18. . As a result, the optical lens film 1 capable of improving the positioning accuracy can be realized.

In the optical lens film 1, the width of the first alignment mark portion 18 may be narrower than the width P _{0 of} the convex portion 2, and is not less than 0.1 times and not more than 5 times the width P ₀ of the convex portion 2. May be. When the first alignment convex portion 19 is formed in the first alignment mark portion 18, the width P ₁ of the first alignment convex portion 19 is further narrower than the range of the width of the first alignment mark portion 18. Thus, by appropriately selecting the width of the first alignment mark portion 18 (and the width P ₁ of the first alignment convex portion 19) (size) as appropriate, the first alignment mark portion 18 having a size corresponding to the positioning accuracy of the optical lens film 1 is selected. One alignment mark portion 18 can be realized.

  As shown in FIG. 2, in the optical lens film 1, the plurality of convex portions 2 extend linearly in parallel, and the cross-sectional shape of the convex portion 2 in a direction perpendicular to the direction in which the convex portion 2 extends. Is semicircular. Further, as shown in FIGS. 1 and 2, the plurality of first alignment convex portions 19 extend linearly in parallel so as to intersect (for example, orthogonally cross) the plurality of convex portions 2. In this case, the present invention can be easily applied to the optical lens film 1 which is a so-called lenticular lens. In addition, since the first alignment convex portion 19 intersects the convex portion 2 as the optical element structure and extends linearly, when the optical lens film 1 is formed as will be described later, 1 alignment convex part 19 can be formed in a series of processes. For example, when the optical lens film 1 is molded, after forming a shape for forming the convex portion 2 in the mold, the mold is rotated by a predetermined angle (for example, 90 °), and further processing is performed. By doing so, the shape for molding the first alignment convex portion 19 can be formed in the mold. And the optical lens film 1 shown in FIGS. 1-3 can be obtained by mold-molding resin etc. using the said type | mold.

  In the optical lens film 1, as shown in FIG. 3, the cross-sectional shape of the first alignment convex portion 19 in a direction perpendicular to the extending direction of the first alignment convex portion 19 is a semicircular shape. In this case, the first alignment convex portion 19 and the convex portion 2 as the optical element structure have similar cross-sectional shapes. Therefore, for example, when the optical lens film 1 is manufactured by molding as described above, an optical element structure is used as a cutting tool used to create a shape corresponding to the first alignment convex portion 19 in a mold used in the molding. A cutting tool having the same cutting edge shape as the cutting tool used to create a shape corresponding to the convex portion 2 can be used. Further, if the cutting amount of the cutting tool is changed between the convex portion 2 and the first alignment convex portion 19 (that is, the height between the convex portion 2 and the first alignment convex portion 19 is changed). It is also possible to use the same cutting tool to form shapes corresponding to the first alignment convex portion 19 and the convex portion 2, respectively. For this reason, the manufacturing process of the optical lens film 1 can be simplified. In addition, what is necessary is just to change the feed pitch of a cutting tool according to each width | variety of the convex part 2, the 1st alignment mark part 18, or the convex part 19 for 1st alignment.

  In the optical lens film 1, as shown in FIGS. 1 and 2, the first alignment mark portion 18 includes a boundary between the first alignment convex portions 19 or the first alignment convex portions 19. The boundary part with the convex part 2 is extended linearly so that it may cross | intersect the extending direction of the some convex part 2 (it orthogonally crosses). In this case, the boundary portion can be used as a positioning mark in the extending direction of the plurality of convex portions 2 (up and down direction in FIG. 1).

  Next, with reference to FIG. 4 and FIG. 5, the manufacturing method of the optical lens film 1 shown in FIGS. 1-3 is demonstrated. The optical lens film 1 is manufactured by a mold using a mold.

  First, as shown in FIG. 4, a step of creating a mold (S10) is performed. Specifically, a mold having a shape corresponding to the surface shape of the optical lens film 1 is created. As a die processing method, any method such as cutting with a cutting tool or electric discharge machining can be used. Moreover, in the said process (S10), as shown in FIG. 5, the process (S11) which processes the part which shape | molds a convex part is implemented. Further, in the step (S10), a step (S12) of processing a portion for forming the alignment mark portion shown in FIG. 5 is performed. In addition, the process (S11) which processes the part which shape | molds a convex part, and the process (S12) which processes the part which shape | molds an alignment mark part may be implemented simultaneously, and may be implemented sequentially.

  Next, a step (S20) of forming an optical lens film using a mold, which is a step of forming the optical lens film 1 by a molding method using the mold prepared in the step (S10), is performed. Specifically, a resin thin film constituting the optical lens film 1 is set between the mold and the facing platen. 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 the heating of the resin thin film, for example, a method in which the resin thin film is sandwiched between the mold and the opposing surface plate, or a method in which only the resin thin film is heated in a non-contact state in advance is arbitrary. Can be adopted. 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.

The resin constituting the optical lens film 1 is preferably a resin that melts in a relatively narrow temperature range and rapidly cures when cooled, since throughput increases. Accordingly, polycarbonate, polyimide, polymethyl methacrylate, polyethersulfone, polysulfone, polyetherimide, and the like are preferable. 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. Further, the value of the width P ₀ of the convex portion 2 of the optical lens film 1 can be set to 50 μm or more and 1000 μm or less, and more preferably 100 μm or more and 500 μm or less. Moreover, the curvature radius in the cross section in the direction orthogonal to the extending direction of the convex portion 2 with respect to the surface of the convex portion 2 can be, for example, 100 μm or more and 1000 μm or less, more preferably 200 μm or more and 600 μm or less. The value of the width ratio (P ₁ / P ₀ ) between the first alignment convex portion 19 and the convex portion 2 is, for example, 0.1 or more and 5 or less, more preferably 0.1 or more and 0.9 or less, and still more preferably It can be 0.1 or more and 0.5 or less. Further, the radius of curvature in the cross section shown in FIG. 3 regarding the surface of the first alignment convex portion 19 can be, for example, 100 μm or more and 1000 μm or less, more preferably 200 μm or more and 600 μm or less.

  Next, when manufacturing a display device using the optical lens film 1 obtained as described above, a method of alignment (positioning) between the optical lens film 1 and another member constituting the display device. Will be briefly described with reference to FIG. 6 and FIG.

  As shown in FIGS. 6 and 7, when using the display unit 20 as another member to be laminated with the optical lens film 1, the surface of the display unit 20 (the surface facing the optical lens film 1) A display unit side alignment mark 32 is formed. Although the display unit side alignment mark 32 can have any shape, the planar shape can be a cross shape as shown in FIG. 6, for example. As the configuration of the display unit side alignment mark 32, for example, an arbitrary configuration such as a resin layer having a color different from that of other portions of the surface of the display unit 20 can be adopted. In the display unit 20 shown in FIG. 6, four display unit side alignment marks 32 are formed on the surface thereof.

  For example, the boundary part 31 between the first alignment convex parts 19 constituting the first alignment mark part 18 of the optical lens film 1 and the end part of the display unit side alignment mark 32 formed on the surface of the display unit 20 And the display unit 20 and the optical lens film 1 in such a manner that the display unit side alignment mark 32 fits between the boundary portions 31 on both sides of the first alignment convex portion 19. Adjust the relative position with. In this way, the position of the optical lens film 1 with respect to the display unit 20 can be accurately determined in the direction in which the convex portion 2 of the optical lens film 1 extends. In FIG. 7, the boundary portion 31 between the first alignment convex portions 19 is used as a reference for alignment, but the boundary portion between the adjacent convex portions 2 and the first alignment convex portions 19 is used as the reference. It may be used as

  After determining the position of the optical lens film 1 with respect to the display unit 20 in this way, the optical lens film 1 is fixed to the surface of the display unit 20. As a method for fixing the optical lens film 1, any method can be used. For example, an adhesive member such as a double-sided tape may be disposed on the back side of the optical lens film 1 (the front side facing the display unit 20). In this way, a display device according to the present invention can be configured.

  As the display unit 20, any device can be applied as long as it can display an image or the like. For example, an apparatus having an arbitrary configuration such as a liquid crystal display unit, a plasma display unit, a display unit using a light emitting element such as an LED or an organic EL element can be used as the display unit 20.

  Next, with reference to FIG. 8 and FIG. 9, the structural example of the display apparatus 10 to which the optical lens film by this invention is applied is demonstrated.

  A display device 10 shown in FIG. 8 includes a backlight 11, an LCD unit 14 disposed on the backlight, and the optical lens film 1 according to the present invention disposed on the display surface side of the LCD unit 14. 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.

  In the display device 10 shown in FIG. 8, 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). Then, the light incident on the optical lens film 1 from the LCD unit 14 is changed to a predetermined direction by the action of the optical lens film 1.

Next, another example of the display device according to the present invention will be described with reference to FIG.
The display device 10 shown in FIG. 9 basically has the same structure as the display device 10 shown in FIG. 8 except that the arrangement of the optical lens film 1 and the active shutter unit 21 are provided. That is, in the display device 10 shown in FIG. 9, the optical lens film 1 and the active shutter unit are disposed between the LCD unit 14 and the backlight 11, more specifically between the LCD unit 14 and the brightness enhancement film 13. 21 is arranged. The planar shape of the optical lens film 1 (and the active shutter unit 21) is such that the first alignment mark portion 18 in the optical lens film 1 is positioned outside the image display area of the LCD unit 14 in plan view. May be larger than the planar shape of the LCD unit 14.

  Here, the active shutter unit 21 is formed with, for example, two rows of band-shaped areas per one of the convex sections 2 along the convex sections 2 of the optical lens film 1, and the liquid crystal or the like is used in the band-shaped areas. It is an optical member that can be switched between transmission and blocking. Two belt-like regions corresponding to one convex portion 2 are in a state where only one belt-like region can transmit light, such as one in which light is transmitted and the other in a state where light is blocked. The band-like region through which light can be transmitted is switched at a period of.

  Such an active shutter unit 21 is used, and also in the LCD unit 14, a liquid crystal pixel unit is arranged corresponding to the band-like region, and display on the pixel unit is performed according to switching between transmission and blocking of light in the band-like region. By switching, for example, a three-dimensional image (or three-dimensional video) can be displayed. It is preferable that the switching between transmission and blocking of the light in the belt-shaped region in the active shutter unit 21 is repeated at an arbitrary cycle. As the repetition period in this case, for example, a period of several tens Hz to several hundreds Hz can be adopted.

  In such a display device 10, it is necessary to align the active shutter unit 21, the optical lens film 1, and the LCD unit 14 with extremely high accuracy, and it is particularly effective to apply the present invention. For example, if the display unit side alignment mark 32 (see FIG. 6) is formed on the LCD unit 14 or the active shutter unit 21 as in the display unit 20 shown in FIGS. Can be accurately aligned with respect to the device.

  From a different point of view, the display device 10 as shown in FIGS. 8 and 9 includes a display unit (LC unit 14 (see FIG. 8) or LCD unit 14 and active shutter unit 21 (see FIG. 9) having a display surface. And the optical lens film 1 described above. The optical lens film 1 overlaps the display surface of the display unit (in FIG. 8, overlaps the image display surface of the LCD unit 14, and in FIG. 9, between the LCD unit 14 and the backlight 11). Are stacked. In this way, the display device 10 including the optical lens film 1 positioned with high accuracy with respect to the LCD unit 14 and the active shutter unit 21 can be realized. For this reason, since the visual effect by the said optical lens film 1 can be acquired reliably, the display apparatus 10 excellent in display quality is realizable.

  In the display device 10, the optical lens film 1 is formed with a plurality of convex portions 2 extending in parallel and linearly as shown in FIGS. 1 to 3 as a plurality of optical element structures. As shown in FIGS. 2 and 3, the cross-sectional shape of the convex portion 2 in the extending direction of the convex portion 2 is a semicircular shape. The plurality of first alignment structures are a plurality of first alignment protrusions 19 that intersect (e.g., orthogonally cross) the plurality of protrusions 2 and extend linearly. The LCD unit 14 and / or the active shutter unit 21 as a display unit includes a display unit side alignment mark 32 (see FIGS. 6 and 7) formed on a portion facing the optical lens film 1. The LCD unit 14 and / or the active shutter unit 21 and the optical lens film 1 include the display unit side alignment mark 32, the boundary portion 31 (see FIG. 7) between the first alignment convex portions 19, and the first alignment. Positioning is performed such that any one of the boundary portions between the convex portion 19 and the convex portion 2 overlaps. In this case, since the optical lens film 1 is positioned with respect to the LCD unit 14 and / or the active shutter unit 21 using the boundary portion having a size smaller than that of the first alignment mark portion 18, the optical lens film 1 can be positioned with high accuracy. Can be positioned. For this reason, since the visual effect by the said optical lens film 1 can be acquired reliably, the display apparatus 10 excellent in display quality is reliably realizable.

  From a different point of view, in the display device 10, in the optical lens film 1, the plurality of optical element structures are the plurality of convex portions 2 extending in parallel and linearly. The cross-sectional shape of the convex portion 2 in the direction perpendicular to the extending direction of the convex portion 2 is a semicircular shape. The first alignment mark portion 18 includes a plurality of first alignment convex portions 19 that intersect with the plurality of convex portions 2 and extend linearly. The display unit 20 (the LC unit 14 (see FIG. 8) or the LCD unit 14 and the active shutter unit 21 (see FIG. 9)) is a display unit side first alignment mark (see FIG. 9) formed in a portion facing the optical lens film 1. 6 of the display unit side alignment mark 32 in FIG. 6 extending along the extending direction of the first alignment mark portion 18). The display unit and the optical lens film 1 include a display unit side first alignment mark, a boundary portion between the plurality of first alignment convex portions 19, and a boundary portion between the first alignment convex portion 19 and the convex portion 2. They are positioned so that one of them overlaps.

  In this case, the optical lens film 1 can be positioned with high accuracy as described above. For this reason, since the visual effect by the said optical lens film 1 can be acquired reliably, the display apparatus 10 excellent in display quality is reliably realizable.

  Next, a first modification of the optical lens film shown in FIGS. 1 to 3 will be described with reference to FIG.

  Referring to FIG. 10, the optical lens film 1 basically has the same configuration as the optical lens film 1 shown in FIGS. 1 to 3, but the cross-sectional shape of the first alignment convex portion 19 is as shown in FIG. 1. 3 is different from the optical lens film 1 shown in FIG. Specifically, in the optical lens film 1 shown in FIG. 10, the cross-sectional shape (in the extending direction of the convex portion 2) of the first alignment convex portion 19 is a triangular shape. Even with such a configuration, the same effect as that of the optical lens film 1 shown in FIGS. 1 to 3 can be obtained. Furthermore, according to the optical lens film 1 shown in FIG. 10, finer alignment than the optical lens film 1 shown in FIGS.

  That is, in the optical lens film 1, as shown in FIG. 10, the cross-sectional shape of the first alignment convex portion 19 in the direction perpendicular to the direction in which the first alignment convex portion 19 extends is triangular. In this case, in the first alignment mark portion 18, in addition to the boundary portions (boundary lines) between the plurality of first alignment convex portions 19, each of the first alignment convex portions 19 also has a triangular apex. Corner portions that are linearly formed are formed at corresponding positions. Therefore, in addition to the boundary portion, the corner portion can also be used as a reference for positioning (for example, a reference for alignment with the display unit side alignment mark 32 shown in FIG. 10). For this reason, positioning with higher positional accuracy than the optical lens film 1 shown in FIGS.

  Next, a second modification of the optical lens film shown in FIGS. 1 to 3 will be described with reference to FIG.

  Referring to FIG. 11, the optical lens film 1 basically has the same configuration as the optical lens film 1 shown in FIGS. 1 to 3, but the cross-sectional shape of the first alignment mark portion 18 is as shown in FIGS. This is different from the optical lens film 1 shown in FIG. Specifically, in the optical lens film 1 shown in FIG. 11, the first alignment mark portion 18 is a flat groove structure portion at the bottom. That is, the cross-sectional shape (in the extending direction of the convex portion 2) of the first alignment mark portion 18 in FIG. 11 is a rectangular shape. Even with such a configuration, the end portion of the first alignment mark portion 18 (the boundary portion with the convex portion 2) can be used for alignment with the display unit side alignment mark 32 (on both sides of the first alignment mark portion 18). The same effect as that of the optical lens film 1 shown in FIGS. 1 to 3 can be obtained by positioning the display unit side alignment mark 32 between the boundary portions.

(Embodiment 2)
With reference to FIG. 12 and FIG. 13, Embodiment 2 of the optical lens film according to the present invention will be described.

  The optical lens film 1 shown in FIGS. 12 and 13 basically has the same configuration as the optical lens film 1 shown in FIGS. 1 to 3, but the second alignment extends in the extending direction of the convex portion 2. The point in which the mark part 8 is formed differs from the optical lens film shown in FIGS. One second alignment mark portion 8 is formed on the main surface of the base body 7 in the vicinity of the end portion of the optical lens film 1 in a direction perpendicular to the extending direction of the convex portion 2 (two in total). Yes. The second alignment mark portion 8 is located at a distance L from the end portion of the optical lens film 1 (that is, the distance between the end portion of the optical lens film 1 and the outer peripheral end of the second alignment mark portion 8 is the distance L). Is formed). The distance L can be set to 1 mm or less, for example.

  In FIG. 12, the convex portion 2 as the optical element structure is also formed in the region between the end portion of the optical lens film 1 and the second alignment mark portion 8, but the convex portion 2 is not formed in the region. A configuration (that is, a configuration in which the surface of the region is flat) may be employed. In FIG. 12, two second alignment mark portions 8 are formed, but three or more second alignment mark portions 8 may be formed.

The second alignment mark portion 8 is a second alignment convex portion that is a plurality of second alignment structural portions having a width P ₁ (see FIG. 3) that is narrower than the width P ₀ (see FIG. 13) of the plurality of convex portions 2. 9 is included. In the optical lens film 1 shown in FIGS. 1 to 3, the second alignment mark portion 8 is constituted by the three second alignment convex portions 9. The second alignment convex portion 9 is formed so as to extend along the extending direction of the convex portion 2. The cross-sectional shape of the second alignment convex portion 9 in the direction perpendicular to the extending direction of the convex portion 2 is a semicircular shape. Note that the number of the second alignment convex portions 9 included in the second alignment mark portion 8 extending linearly in parallel with the plurality of optical element structures (convex portions 2) may be two or four. It may be the above. Furthermore, as shown in FIG. 12, the two second alignment mark portions 8 may have the same configuration, but may have different configurations. For example, the number and size of the second alignment convex portions 9 included in each of the two second alignment mark portions 8 may be different.

In this way, since the second alignment mark portion 8 includes a plurality of second alignment convex portions 9 having a width P ₁ narrower than the width P ₀ of the convex portion 2 that is an optical element structure, 12 of the optical lens film 1 at a size (size of the second alignment convex portion 9) smaller than the size of the entire convex portion 2 or the second alignment mark portion 8 by using the second alignment convex portion 9. Positioning can be performed at the left and right sides (directions intersecting (for example, orthogonal to) the extending direction of the protrusions 2). As a result, it is possible to realize the optical lens film 1 capable of improving the positioning accuracy not only in the vertical direction of FIG. 12 but also in the horizontal direction.

In the optical lens film 1, the width of the second alignment mark portion can be set to, for example, 5 times or less the width P ₀ of the convex portion 2. The width of the second alignment mark portion 8 may be narrower than the width P _{0 of} the convex portion 2 or may be 0.1 to 0.9 times the width P ₀ of the convex portion 2. When forming the second alignment projections 9 into the second alignment mark portion 8, the width P1 of the second alignment projection 9, the numerical range (more than 0.1 times the width P ₀ of the convex portions 2 5 More than twice). As described above, the width of the second alignment mark portion 8 and further the width P ₁ (size) of the second alignment convex portion 9 are appropriately selected, so that the second of the size corresponding to the positioning accuracy of the optical lens film 1 is obtained. The alignment mark portion 8 can be realized.

  As shown in FIG. 2 and FIG. 3, in the optical lens film 1, the plurality of convex portions 2 extend linearly in parallel, and the convex portions 2 in a direction perpendicular to the direction in which the convex portions 2 extend. The cross-sectional shape is semicircular. The plurality of second alignment convex portions 9 extend linearly in parallel with the plurality of convex portions 2 as shown in FIGS. In this case, the present invention can be easily applied to the optical lens film 1 which is a so-called lenticular lens. In addition, since the second alignment convex portion 9 extends linearly in parallel with the convex portion 2 as the optical element structure, when the optical lens film 1 is formed as described later, The two alignment convex portions 9 can be formed simultaneously. For example, when the optical lens film 1 is molded, when the shape for molding the convex portion 2 is formed in the mold, the shape for molding the second alignment convex portion 9 is simultaneously formed in the mold. be able to. And the optical lens film 1 shown in FIGS. 1-3 can be obtained by mold-molding resin etc. using the said type | mold.

  In the optical lens film 1, as shown in FIG. 3, the cross-sectional shape of the second alignment convex portion 9 in a direction perpendicular to the extending direction of the second alignment convex portion 9 is a semicircular shape. In this case, the second alignment convex portion 9 and the convex portion 2 as the optical element structure have similar cross-sectional shapes. Therefore, for example, when the optical lens film 1 is manufactured by mold molding as described above, an optical element structure is used as a cutting tool used to create a shape corresponding to the second alignment convex portion 9 in the mold used in the mold molding. A cutting tool having the same cutting edge shape as the cutting tool used to create a shape corresponding to the convex portion 2 can be used. Further, if the cutting amount of the cutting tool is changed between the convex portion 2 and the second alignment convex portion 9 (that is, the height of the convex portion 2 and the second alignment convex portion 9 is changed). It is also possible to use the same cutting tool to form shapes corresponding to the second alignment convex part 9 and the convex part 2, respectively. For this reason, the manufacturing process of the optical lens film 1 can be simplified.

  In the optical lens film 1, as shown in FIGS. 1 and 2, the second alignment mark portion 8 includes a boundary portion between the plurality of second alignment convex portions 9 or the second alignment convex portions 9. A boundary portion with the convex portion 2 extends linearly in parallel with the plurality of convex portions 2. In this case, the boundary portion can be used as a positioning mark in a direction perpendicular to the extending direction of the plurality of convex portions 2 (the left-right direction in FIG. 1).

  As shown in FIG. 12, in the optical lens film 1, the first alignment mark portion 18 and the second alignment mark portion 8 include crossing portions that cross each other. At the intersection, the structure of the second alignment mark portion 8 is formed.

  In this case, the second alignment mark portion 8 is preferentially formed at the intersection, and the second alignment mark portion 8 is not divided by the first alignment mark portion 18 (the mold is In the production step, the convex portion 2 and the first alignment mark portion 18 are formed in this order, and then the second alignment mark portion 8 is formed. Here, the positioning accuracy (positioning accuracy in the left-right direction in FIG. 12) in the direction (crossing direction) intersecting the extending direction of the plurality of convex portions 2 is the direction along the extending direction of the convex portions 2 (extension). In some cases, higher accuracy than the positioning accuracy in the current direction) is required. This is because the plurality of convex portions 2 are arranged side by side in the left-right direction in FIG. 12 (having a periodic structure), so that the optical action of the optical lens film 1 is reliably exhibited. This is because the positioning accuracy in the direction is important. In such a case, the second alignment mark portion 8 used for positioning in the crossing direction is preferentially formed at the crossing portion so that the second alignment mark portion 8 is not divided at the crossing portion. Can do. For this reason, it is possible to suppress the occurrence of a problem that the positioning accuracy using the second alignment mark portion 8 is deteriorated due to the second alignment mark portion 8 being divided.

  Further, the optical lens film 1 shown in FIGS. 12 and 13 may be applied to the display device 10 as shown in FIGS. In this case, the display unit (the LC unit 14 (see FIG. 8) or the LCD unit 14 and the active shutter unit 21 (see FIG. 9)) is a display unit side second alignment mark formed in a portion facing the optical lens film 1. (The portion of the display unit side alignment mark 32 in FIG. 6 that extends in the direction intersecting the extending direction of the first alignment mark portion 18) may be included. The display unit and the optical lens film 1 include a display unit side second alignment mark, a boundary portion between the plurality of second alignment convex portions 9, and a boundary portion between the second alignment convex portions 9 and the convex portions 2. It may be positioned so that one of them overlaps. In this case, in addition to the first alignment mark part 18, the optical lens film 1 is positioned with respect to the display unit using the boundary part having a size smaller than that of the second alignment mark part 8. Positioning can be performed with high accuracy. For this reason, since the visual effect by the said optical lens film 1 can be acquired reliably, the display apparatus excellent in display quality is reliably realizable.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above-described embodiment but by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

  The present invention is advantageously applied to an optical lens film having an alignment mark portion and a display device using the optical lens film.

  DESCRIPTION OF SYMBOLS 1 Optical lens film, 2 Convex part, 7 Base body, 8 2nd alignment mark part, 9 2nd alignment 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 first alignment mark part, 19 first alignment convex part, 20 display unit, 21 active shutter unit, 31 boundary part, 32 display unit side alignment mark.

Claims (14)

A base body having a main surface;
A plurality of optical element structures that are formed on the main surface of the base body and change the traveling direction of light;
A first alignment mark portion formed on the main surface of the base body,
The plurality of optical element structures are formed to extend linearly in parallel with each other,
The first alignment mark portion is an optical lens film that extends linearly across the plurality of optical element structures.   The optical lens film according to claim 1, wherein a width of the first alignment mark portion is narrower than a width of the plurality of optical element structures.   2. The optical lens film according to claim 1, wherein a width of the first alignment mark portion is not less than 0.1 times and not more than 5 times a width of the optical element structure.   The optical lens film according to claim 1, wherein the first alignment mark part includes a plurality of first alignment structures. The plurality of optical element structures are a plurality of convex portions extending linearly in parallel, and a cross-sectional shape of the convex portion in a direction perpendicular to a direction in which the convex portions extend is a semicircular shape,
5. The optical lens film according to claim 4, wherein the plurality of first alignment structures are a plurality of first alignment protrusions that intersect the plurality of protrusions and extend linearly. 6.   In the first alignment structure portion, a boundary portion between the plurality of first alignment convex portions or a boundary portion between the first alignment convex portion and the convex portion intersects the plurality of convex portions. The optical lens film according to claim 5, which extends linearly.   The optical lens film according to claim 1, further comprising a second alignment mark portion that extends linearly in parallel with the plurality of optical element structures.   The optical lens film according to claim 7, wherein the second alignment mark part includes a plurality of second alignment structure parts having a width narrower than a width of the plurality of optical element structures.   The optical lens film according to claim 8, wherein the second alignment structure part is a plurality of second alignment convex parts extending linearly in parallel with the plurality of optical element structures.   In the second alignment structure portion, a boundary portion between the plurality of second alignment convex portions or a boundary portion between the second alignment convex portion and the optical element structure is parallel to the plurality of optical element structures. The optical lens film according to claim 9, which extends linearly. The first alignment mark part and the second alignment mark part include a crossing part that crosses each other,
The optical lens film according to any one of claims 7 to 10, wherein a structure of the second alignment mark portion is formed at the intersection. A display unit having a display surface;
A display apparatus provided with the optical lens film of Claim 1 laminated | stacked with the said display unit so that it might overlap with the said display surface of the said display unit. In the optical lens film,
The plurality of optical element structures are a plurality of convex portions extending linearly in parallel, and a cross-sectional shape of the convex portion in a direction perpendicular to a direction in which the convex portions extend is a semicircular shape,
The first alignment mark portion includes a plurality of first alignment convex portions extending linearly across the plurality of convex portions,
The display unit includes a display unit side first alignment mark formed in a portion facing the optical lens film,
The display unit and the optical lens film include a first alignment mark on the display unit side, a boundary portion between the plurality of first alignment convex portions, and a boundary between the first alignment convex portion and the convex portion. The display device according to claim 12, wherein any one of the sections is positioned so as to overlap each other. The optical lens film further includes a second alignment mark portion extending linearly in parallel with the plurality of convex portions,
The second alignment mark portion includes a plurality of second alignment convex portions extending linearly in parallel with the plurality of convex portions,
The display unit includes a display unit side second alignment mark formed in a portion facing the optical lens film,
The display unit and the optical lens film include a second alignment mark on the display unit side, a boundary portion between the plurality of second alignment convex portions, and a boundary between the second alignment convex portion and the convex portion. The display device according to claim 13, wherein any one of the parts is positioned so as to overlap each other.

Images